CN109665763B - Quick-hardening early-strength composite repair mortar - Google Patents
Quick-hardening early-strength composite repair mortar Download PDFInfo
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- CN109665763B CN109665763B CN201910134156.1A CN201910134156A CN109665763B CN 109665763 B CN109665763 B CN 109665763B CN 201910134156 A CN201910134156 A CN 201910134156A CN 109665763 B CN109665763 B CN 109665763B
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/72—Repairing or restoring existing buildings or building materials
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
- C04B2201/52—High compression strength concretes, i.e. with a compression strength higher than about 55 N/mm2, e.g. reactive powder concrete [RPC]
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Abstract
The invention belongs to the technical field of building materials, and provides a quick-hardening early-strength composite repair mortar which comprises the following components in percentage by weight: 5-10% of water, 20-30% of cement, 1-5% of silica fume, 1-5% of fly ash, 50-70% of quartz sand, 0.4-0.5% of composite early strength agent, 0.06-0.1% of water reducing agent, 1-5% of rubber powder and 0.06-0.8% of hybrid fiber, wherein the composite early strength agent consists of a component A and a component B, the component A is nano calcium carbonate whisker, the component B is a mixture of triisopropanolamine and aluminum sulfate, the quartz sand consists of coarse sand, medium sand and fine sand, and the hybrid fiber consists of basalt fiber and polypropylene fiber. The invention solves the problems of reverse shrinkage, high dry shrinkage and low bonding strength of the repair mortar in the prior art.
Description
Technical Field
The invention belongs to the technical field of building materials, and relates to quick-hardening early-strength composite repair mortar.
Background
As a main building material, the cement concrete plays an irreplaceable role in the basic construction of China, particularly in the aspect of road construction. As one of two high-grade pavements in China, the cement concrete pavement is widely applied to road construction in China by virtue of excellent properties of high rigidity, strong bearing capacity, low cost, convenience in construction and the like. However, with the development of society, the road traffic volume is increased rapidly, cement concrete pavements are rolled and abraded by vehicles for a long time, the pavements are damaged to different degrees, particularly, the phenomena of heavy load and overload of the vehicles frequently occur, and the road damage speed is accelerated. Therefore, the repair of the existing cement concrete pavement becomes a big problem for the social related departments.
Aiming at the research of the cement concrete pavement patching material, scholars at home and abroad explore a lot and obtain a lot of research results. Currently available road repair materials can be roughly classified into the following categories: inorganic repairing materials, organic repairing materials and polymer modified concrete repairing materials. The inorganic repairing material is prepared with special cement, such as fast hardening sulphoaluminate cement, magnesium phosphate cement and high aluminate cement, or through compounding special cement and common silicate cement to raise the early strength of the repairing material. However, the early strength of the material is developed too fast, so that the later strength is inverted and shrunk, and the bonding performance between the material and the interface of the old concrete is seriously influenced. The organic repairing material is prepared by replacing cement with organic matters (asphalt, modified asphalt, epoxy resin and polyurethane glue) as a cementing material in the repairing material. Because the organic matter has good bonding performance, the organic matter can be well bonded with the old concrete. However, the organic repairing material has the disadvantages of high raw material cost, easy aging and easy peeling under the action of long-term external environment. Polymer modified concrete is generally divided into two categories: firstly, polymer dipping concrete (PIC), namely dipping the polymer into the gaps of the concrete, and then, gluing the concrete and the polymer into a whole through polymerization; polymer Modified Concrete (PMC), namely polymer modified concrete which is doped with polymer in the cement hydration process and is used as a cementing material together. The concrete modified by the polymer has excellent performances of good bonding property and high breaking strength, but has high price, high temperature resistance and easy cracking. ,
disclosure of Invention
The invention provides a quick-hardening early-strength composite repair mortar, which solves the problems of reverse shrinkage, high dry shrinkage and low bonding strength of the repair mortar in the prior art.
The technical scheme of the invention is that the quick-hardening early-strength composite repair mortar is prepared from the following components in percentage by weight:
5 to 10 percent of water, 20 to 30 percent of cement, 1 to 5 percent of silica fume, 1 to 5 percent of fly ash, 50 to 70 percent of quartz sand, 0.4 to 0.5 percent of composite early strength agent, 0.06 to 0.1 percent of water reducing agent, 1 to 5 percent of rubber powder, 0.06 to 0.8 percent of hybrid fiber,
the composite early strength agent is composed of a component A and a component B, wherein the component A is nano calcium carbonate whisker, and the component B is a mixture of triisopropanolamine and aluminum sulfate.
As a further technical scheme, the paint comprises the following components in percentage by weight:
7.25% of water, 22.13% of cement, 2.46% of silica fume, 1.29% of fly ash, 64.72% of quartz sand, 0.44% of composite early strength agent, 0.08% of water reducing agent, 1.55% of rubber powder and 0.07% of hybrid fiber.
As a further technical scheme, the quartz sand consists of coarse sand, medium sand and fine sand, and the mass ratio of the coarse sand to the medium sand to the fine sand is (20-25): (15-25): (15-20), the grain size of the coarse sand is 2.36-4.75 mm, the grain size of the medium sand is 1.18-2.36 mm, and the grain size of the fine sand is 0.6-1.18 mm.
According to a further technical scheme, the weight of the triisopropanolamine accounts for 0.005-0.025 percent of the total amount of the rapid-hardening early-strength composite repair mortar, the weight of the aluminum sulfate accounts for 0.1-0.3 percent of the total amount of the rapid-hardening early-strength composite repair mortar, and the weight of the nano calcium carbonate whiskers accounts for 0.1-0.3 percent of the total amount of the rapid-hardening early-strength composite repair mortar.
As a further technical scheme, the hybrid fibers are basalt fibers and polypropylene fibers, the weight of the basalt fibers accounts for 0.05% -0.5% of the total amount of the rapid-hardening early-strength composite repair mortar, and the weight of the polypropylene fibers accounts for 0.01% -0.3% of the total amount of the rapid-hardening early-strength composite repair mortar.
As a further technical scheme, the water reducing agent is a polycarboxylic acid high-efficiency water reducing agent.
As a further technical scheme, the dispersible latex powder is redispersible vinyl acetate/ethylene copolymer rubber powder.
A preparation method of quick-hardening early-strength composite repair mortar comprises the following steps:
s1, weighing each component for later use according to the formula of the quick-hardening early-strength composite repair mortar;
s2, uniformly stirring cement, fly ash, silica fume, rubber powder, a water reducing agent and the component A with quartz sand to obtain dry mixture;
s3, adding hybrid fibers into the dry mixture obtained in the step S2, and stirring for 20-45S to obtain a dry mixture doped with fibers;
s4, adding 45-65% of water in the formula amount into the component B, and uniformly mixing to obtain a component B solution;
s5, adding the B component solution obtained in the step S4 into the dry mixture doped with fibers obtained in the step S3, and quickly stirring for 30-45S to obtain a primary mixed material;
and S6, slowly adding the residual water in the formula into the primary mixed material obtained in the step S5, and stirring for 20-30S to obtain the rapid-hardening early-strength composite repair mortar.
As a further technical solution, between the step S1 and the step S2, a step S20 is further included: mechanically grinding and activating the fly ash to obtain the activated fly ash with the particle size of 200 meshes, and carrying out ultrasonic treatment on the silica fume for 1h to obtain the ultrasonically treated silica fume.
The invention has the following using principle and beneficial effects:
1. according to the invention, the concept of the composite material is utilized to carry out multi-component co-blending, the component A is dry-mixed with cement, fly ash and the like in the preparation method, the mixed fiber is added, then the component B solution is added, and then water is slowly added for stirring instead of directly mixing the components, so that the synergistic effect among the components can be fully exerted, the prepared quick-hardening early-strengthening type composite repair mortar has the excellent performances of dry shrinkage, strong bonding property with an old concrete interface, cracking resistance, low cost and the like, and the poor performances of strength shrinkage, large dry shrinkage rate, low bonding strength and the like of the traditional repair material are effectively improved. Firstly, rapid hardening cement is not mixed in a cementing material, P.O 42.5 ordinary portland cement is mainly mixed with fly ash and silica fume of mineral admixture to form a ternary cementing system, and under the coordination of the volcanic ash action and the micro-aggregate action of the composite early strength agent and the mineral admixture, the mortar obtains higher early strength and does not have strength retraction in the later period; the close packing of the three kinds of quartz sand with different particle size distribution improves the compactness of the mortar, and improves the dry shrinkage resistance and the durability of the mortar; the penetration and water retention of the redispersible rubber powder effectively improve the bonding property between mortar and old concrete; the "microfibrillation" of the redispersible rubber powder and the filling action of the hybrid fibres and mineral admixtures effectively reduce the dry shrinkage of the mortar.
2. The composite early strength agent consists of a component A and a component B, wherein the component A is nano calcium carbonate crystal whisker, the component B is a mixture of triisopropanolamine and aluminum sulfate, the aluminum sulfate is easy to dissolve in water, and a large amount of trivalent cations Al are generated after the aluminum sulfate is dissolved3+And a divalent anion SO4 2-Breaking the original electrochemical balance in the solution, increasing the ion concentration in the solution, and reacting with the hydration product calcium hydroxide of the cement to generate ettringite and secondary gypsum with higher activity, wherein the secondary gypsum is rapidly reacted with clinker mineral C3A reacts to generate acicular ettringite crystals, a large number of acicular ettringite crystals form a three-dimensional space network framework structure, and the acicular ettringite crystals are combined with C-S-H gel to form a relatively compact matrix, so that the early strength is improved. In addition, the reaction consumes a large amount of calcium hydroxide, reduces the concentration of the calcium hydroxide in the solution, promotes the hydration reaction, and the cement paste after the cement hydration belongs to a solid-phase dispersion structure with an electric double layer, so that the ionic effect of aluminum sulfate electrolyte promotes the diffusion electric double layer to be compressed, the repulsion among particles is weakened, C-S-H gel in the solution is precipitated, the gel concentration is reduced, the hydration process is accelerated, and a large amount of gel is generated. Proper amount of nano calcium carbonate crystal whisker is uniformly dispersed in cement particles, and due to small size effect, the micro crystal nucleus can be provided for the crystal growth of hydration products, and the nucleation barrier of the hydration products is reduced, so that the generation of the hydration products is accelerated. Triisopropanolamine can stably exist in alkaline solution and can improve C through complexation4The hydration speed of AF can accelerate the disintegration and hydration of the glass phase of the fly ash, the volcanic ash effect of the fly ash is fully exerted, and the later strength of the matrix is improved, so that the early strength of the mortar can be obviously improved due to the synergistic effect of the three components of the nano calcium carbonate crystal whisker, the triisopropanolamine and the aluminum sulfate.
3. Compared with the existing repairing material, the powder cementing material provided by the invention is prepared according to the preparation concept of the active powder concrete: the fineness and the grain composition of the powder material are optimized, the content of active components is improved, the cementing material mainly comprises P.O 42.5 ordinary portland cement, and then the cementing material is mixed with fly ash and silica fume which are mineral admixture materials to form a ternary cementing system.
4. In the invention, the fineness and the activity of the mineral admixture are improved by carrying out mechanical activation treatment on the mineral admixture, and the micro-aggregate effect and the volcanic ash effect of the mineral admixture are fully exerted. The fly ash is mechanically ground, the particle size of the fly ash is reduced, the fineness of the fly ash is increased, the coated small active particles are fully released, and the content of the active particles is increased. The ultrasonic treatment is adopted to carry out physical dispersion treatment on the silica fume with larger fineness, so that the agglomeration phenomenon is reduced.
5. According to the invention, the redispersible latex powder is added into the formula, has redispersibility and can penetrate into cracks and pores at the interface of concrete, so that a strong anchoring effect is formed, the bonding strength of the repair mortar is improved, the redispersible latex powder has certain water retention property, and the moisture in the mortar entering the cracks or the pores can not be absorbed by surrounding matrixes, so that the mortar can be normally hydrated to generate more hydration products, the mechanical occlusion effect between the repair mortar and the old concrete is strengthened, the bonding effect is enhanced, and after the rubber powder uniformly dispersed in the mortar is hardened, the 'microfiber' effect is realized, and the cracking of the mortar is inhibited; and a large amount of rubber powder is coated on the surface of the hydration product, so that the migration of internal water molecules is hindered, and the dry shrinkage of the mortar is reduced.
6. In the invention, the fiber is formed by mixing polypropylene fiber with low elastic modulus and basalt fiber with high elastic modulus according to a certain proportion. The polypropylene fiber with low elastic modulus is light, and can obtain more fibers under the same mixing amount, so that the fiber spacing is reduced. The basalt fibers with high elastic modulus are distributed in three-dimensional disorientation in the mortar, so that a larger constraint effect is provided for the hardened mortar, the stress concentration is effectively reduced, and the dry shrinkage resistance of the mortar is improved.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Chemical admixtures used in the following examples: the redispersible rubber powder is redispersible vinyl acetate/ethylene copolymer rubber powder which is produced by Shanghai minister and promoter chemical technology company Limited and takes polyvinyl alcohol as protective colloid; the water reducing agent is a powdery polycarboxylic acid high-efficiency water reducing agent produced by Shanghai Qinzhi and chemical engineering Co., Ltd; triisopropanolamine is produced by the remote chemical reagents limited of Tianjin; the aluminum sulfate is produced by Shanxi Long chemical plant of Guangdong; the nano calcium carbonate crystal whisker is produced by the Guangdong fine chemical research institute in Tianjin.
Example 1
The quick-hardening early-strength composite repair mortar comprises the following components in percentage by weight:
5% of water, 20% of cement, 1% of silica fume, 2% of fly ash, 70% of quartz sand (25% of coarse sand, 25% of medium sand and 20% of fine sand), 0.4% of composite early strength agent (0.21% of nano calcium carbonate whisker in the component A, 0.01% of triisopropanolamine and 0.22% of aluminum sulfate in the component B), 0.06% of water reducing agent, 1.48% of rubber powder, 0.06% of hybrid fiber (0.05% of basalt fiber and 0.01% of polypropylene fiber), 2.36-4.75 mm of coarse sand, 1.18-2.36 mm of medium sand and 0.6-1.18 mm of fine sand.
The preparation method comprises the following steps:
s1, weighing each component for later use according to the formula of the quick-hardening early-strength composite repair mortar;
s20: mechanically grinding and activating the fly ash to a particle size of 200 meshes to obtain activated fly ash, and carrying out ultrasonic treatment on the silica fume for 1h to obtain ultrasonically treated silica fume;
s2, uniformly stirring cement, the activated fly ash obtained in the step S20, the ultrasonically treated silica fume, the rubber powder, the water reducing agent, the component A and quartz sand to obtain a dry mixture;
s3, adding hybrid fibers into the dry mixture obtained in the step S2, and stirring for 20-45S to obtain a dry mixture doped with fibers;
s4, adding 45-65% of water in the formula amount into the component B, and uniformly mixing to obtain a component B solution;
s5, adding the B component solution obtained in the step S4 into the dry mixture doped with fibers obtained in the step S3, and quickly stirring for 30-45S to obtain a primary mixed material;
and S6, slowly adding the residual water in the formula into the primary mixed material obtained in the step S5, and stirring for 20-30S to obtain the rapid-hardening early-strength composite repair mortar.
The performance test of the quick-hardening early-strength composite repair mortar obtained in the embodiment is shown in table 1:
table 1 test results of properties of the quick hardening early strength type composite repair mortar obtained in example 1
Example 2
The quick-hardening early-strength composite repair mortar comprises the following components in percentage by weight:
7.29 percent of water, 22.25 percent of cement, 2.47 percent of silica fume, 1.3 percent of fly ash, 65.05 percent of quartz sand (25.13 percent of coarse sand, 21.16 percent of medium sand and 18.76 percent of fine sand), 0.44 percent of composite early strength agent (the component A comprises 0.21 percent of nano calcium carbonate whisker, the component B comprises 0.01 percent of triisopropanolamine and 0.22 percent of aluminum sulfate), 0.08 percent of water reducing agent, 1.05 percent of rubber powder, 0.07 percent of hybrid fiber (0.06 percent of basalt fiber and 0.01 percent of polypropylene fiber), 2.36 to 4.75mm of coarse sand, 1.18 to 2.36mm of medium sand and 0.6 to 1.18mm of fine sand.
The preparation method comprises the following steps:
s1, weighing each component for later use according to the formula of the quick-hardening early-strength composite repair mortar;
s20: mechanically grinding and activating the fly ash to a particle size of 200 meshes to obtain activated fly ash, and carrying out ultrasonic treatment on the silica fume for 1h to obtain ultrasonically treated silica fume;
s2, uniformly stirring cement, the activated fly ash obtained in the step S20, the ultrasonically treated silica fume, the rubber powder, the water reducing agent, the component A and quartz sand to obtain a dry mixture;
s3, adding hybrid fibers into the dry mixture obtained in the step S2, and stirring for 30S to obtain a dry mixture doped with fibers;
s4, adding 50% of water according to the formula amount into the component B, and uniformly mixing to obtain a component B solution;
s5, adding the component B solution obtained in the step S4 into the dry mixture of the doped fibers obtained in the step S3, and quickly stirring for 30S to obtain a primary mixture;
and S6, slowly adding the residual water in the formula into the primary mixed material obtained in the step S5, and stirring for 20S to obtain the quick-hardening early-strength composite repair mortar.
The performance test of the quick-hardening early-strength composite repair mortar obtained in the embodiment is shown in table 2:
table 2 test results of the properties of the quick hardening early strength type composite repair mortar obtained in example 2
Example 3
The quick-hardening early-strength composite repair mortar comprises the following components in percentage by weight:
6.79 percent of water, 20.75 percent of cement, 2.31 percent of silica fume, 1.21 percent of fly ash, 67.41 percent of quartz sand (26.04 percent of coarse sand, 21.92 percent of medium sand and 19.44 percent of fine sand), 0.42 percent of composite early strength agent (the component A comprises 0.20 percent of nano calcium carbonate whisker, the component B comprises 0.01 percent of triisopropanolamine and 0.21 percent of aluminum sulfate), 0.07 percent of water reducing agent, 0.97 percent of rubber powder and 0.07 percent of hybrid fiber (0.06 percent of basalt fiber and 0.01 percent of polypropylene fiber), wherein the particle size of the coarse sand is 2.36-4.75 mm, the particle size of the medium sand is 1.18-2.36 mm, and the particle size of the fine sand is 0.6-1.18 mm.
The preparation method comprises the following steps:
s1, weighing each component for later use according to the formula of the quick-hardening early-strength composite repair mortar;
s20: mechanically grinding and activating the fly ash to a particle size of 200 meshes to obtain activated fly ash, and carrying out ultrasonic treatment on the silica fume for 1h to obtain ultrasonically treated silica fume;
s2, uniformly stirring cement, the activated fly ash obtained in the step S20, the ultrasonically treated silica fume, the rubber powder, the water reducing agent, the component A and quartz sand to obtain a dry mixture;
s3, adding hybrid fibers into the dry mixture obtained in the step S2, and stirring for 25S to obtain a dry mixture doped with fibers;
s4, adding 55% of water according to the formula amount into the component B, and uniformly mixing to obtain a component B solution;
s5, adding the component B solution obtained in the step S4 into the dry mixture of the doped fibers obtained in the step S3, and quickly stirring for 45S to obtain a primary mixture;
and S6, slowly adding the residual water in the formula into the primary mixed material obtained in the step S5, and stirring for 30S to obtain the quick-hardening early-strength composite repair mortar.
The performance test of the quick-hardening early-strength composite repair mortar obtained in the embodiment is shown in table 3:
table 3 test results of the properties of the quick hardening early strength type composite repair mortar obtained in example 3
Example 4
The quick-hardening early-strength composite repair mortar comprises the following components in percentage by weight:
7.85% of water, 23.85% of cement, and silica fume: 2.65 percent; fly ash: 1.55 percent; quartz sand: 62.34% (coarse sand 24.08%, medium sand 20.28%, fine sand 17.98%), composite early strength agent 0.48% (A component: nano calcium carbonate whisker 0.23%, B component: triisopropanolamine 0.01% and aluminum sulfate 0.24%), water reducing agent 0.08%, rubber powder 1.13%, hybrid fiber 0.07% (basalt fiber 0.06%, polypropylene fiber 0.01%), coarse sand with particle size of 2.36-4.75 mm, medium sand with particle size of 1.18-2.36 mm, fine sand with particle size of 0.6-1.18 mm.
The preparation method comprises the following steps:
s1, weighing each component for later use according to the formula of the quick-hardening early-strength composite repair mortar;
s20: mechanically grinding and activating the fly ash to a particle size of 200 meshes to obtain activated fly ash, and carrying out ultrasonic treatment on the silica fume for 1h to obtain ultrasonically treated silica fume;
s2, uniformly stirring cement, the activated fly ash obtained in the step S20, the ultrasonically treated silica fume, the rubber powder, the water reducing agent, the component A and quartz sand to obtain a dry mixture;
s3, adding hybrid fibers into the dry mixture obtained in the step S2, and stirring for 20-45S to obtain a dry mixture doped with fibers;
s4, adding 60% of water according to the formula amount into the component B, and uniformly mixing to obtain a component B solution;
s5, adding the component B solution obtained in the step S4 into the dry mixture of the doped fibers obtained in the step S3, and quickly stirring for 35S to obtain a primary mixture;
and S6, slowly adding the residual water in the formula into the primary mixed material obtained in the step S5, and stirring for 25S to obtain the quick-hardening early-strength composite repair mortar.
The performance test of the quick-hardening early-strength composite repair mortar obtained in the embodiment is shown in table 4:
table 4 test results of the properties of the quick hardening early strength type composite repair mortar obtained in example 4
Example 5
The quick-hardening early-strength composite repair mortar comprises the following components in percentage by weight:
7.25 percent of water, 22.13 percent of cement, 2.46 percent of silica fume, 1.29 percent of fly ash, 64.72 percent of quartz sand (25.00 percent of coarse sand, 21.05 percent of medium sand and 18.67 percent of fine sand), 0.44 percent of composite early strength agent (the component A comprises 0.21 percent of nano calcium carbonate whisker, the component B comprises 0.01 percent of triisopropanolamine and 0.22 percent of aluminum sulfate), 0.08 percent of water reducing agent, 1.56 percent of rubber powder, 0.07 percent of hybrid fiber (0.06 percent of basalt fiber and 0.01 percent of polypropylene fiber), 2.36 to 4.75mm of grain diameter of the coarse sand, 1.18 to 2.36mm of grain diameter of the medium sand and 0.6 to 1.18mm of grain diameter of the fine sand.
The preparation method comprises the following steps:
s1, weighing each component for later use according to the formula of the quick-hardening early-strength composite repair mortar;
s20: mechanically grinding and activating the fly ash to a particle size of 200 meshes to obtain activated fly ash, and carrying out ultrasonic treatment on the silica fume for 1h to obtain ultrasonically treated silica fume;
s2, uniformly stirring cement, the activated fly ash obtained in the step S20, the ultrasonically treated silica fume, the rubber powder, the water reducing agent, the component A and quartz sand to obtain a dry mixture;
s3, adding hybrid fibers into the dry mixture obtained in the step S2, and stirring for 20S to obtain a dry mixture doped with fibers;
s4, adding 45% of water according to the formula amount into the component B, and uniformly mixing to obtain a component B solution;
s5, adding the component B solution obtained in the step S4 into the dry mixture of the doped fibers obtained in the step S3, and quickly stirring for 45S to obtain a primary mixture;
and S6, slowly adding the residual water in the formula into the primary mixed material obtained in the step S5, and stirring for 30S to obtain the quick-hardening early-strength composite repair mortar.
The performance test of the quick-hardening early-strength composite repair mortar obtained in the embodiment is shown in table 5:
table 5 test results of properties of the quick hardening early strength type composite repair mortar obtained in example 5
Example 6
The quick-hardening early-strength composite repair mortar comprises the following components in percentage by weight:
7.28 percent of water, 22.23 percent of cement, 2.47 percent of silica fume, 1.3 percent of fly ash, 65.01 percent of quartz sand (25.11 percent of coarse sand, 21.14 percent of medium sand and 18.75 percent of fine sand), 0.44 percent of composite early strength agent (the component A comprises 0.21 percent of nano calcium carbonate whisker, the component B comprises 0.01 percent of triisopropanolamine and 0.22 percent of aluminum sulfate), 0.08 percent of water reducing agent, 1.04 percent of rubber powder, 0.15 percent of hybrid fiber (0.13 percent of basalt fiber and 0.02 percent of polypropylene fiber), 2.36 to 4.75mm of coarse sand, 1.18 to 2.36mm of medium sand and 0.6 to 1.18mm of fine sand.
The preparation method comprises the following steps:
s1, weighing each component for later use according to the formula of the quick-hardening early-strength composite repair mortar;
s20: mechanically grinding and activating the fly ash to a particle size of 200 meshes to obtain activated fly ash, and carrying out ultrasonic treatment on the silica fume for 1h to obtain ultrasonically treated silica fume;
s2, uniformly stirring cement, the activated fly ash obtained in the step S20, the ultrasonically treated silica fume, the rubber powder, the water reducing agent, the component A and quartz sand to obtain a dry mixture;
s3, adding hybrid fibers into the dry mixture obtained in the step S2, and stirring for 40S to obtain a dry mixture doped with fibers;
s4, adding 65% of water according to the formula amount into the component B, and uniformly mixing to obtain a component B solution;
s5, adding the component B solution obtained in the step S4 into the dry mixture of the doped fibers obtained in the step S3, and quickly stirring for 35S to obtain a primary mixture;
and S6, slowly adding the residual water in the formula into the primary mixed material obtained in the step S5, and stirring for 20S to obtain the quick-hardening early-strength composite repair mortar.
The performance test of the quick-hardening early-strength composite repair mortar obtained in the embodiment is shown in table 6:
table 6 test results of properties of the quick hardening early strength type composite repair mortar obtained in example 6
Example 7
The quick-hardening early-strength composite repair mortar comprises the following components in percentage by weight:
10% of water, 30% of cement, 5% of silica fume, 1% of fly ash, 50% of quartz sand (20% of coarse sand, 15% of medium sand and 15% of fine sand), 0.5% of composite early strength agent (0.25% of nano calcium carbonate whisker in the component A, 0.025% of triisopropanolamine and 0.225% of aluminum sulfate in the component B), 0.1% of water reducing agent, 2.6% of rubber powder and 0.8% of hybrid fiber (0.5% of basalt fiber and 0.3% of polypropylene fiber), wherein the particle size of the coarse sand is 2.36-4.75 mm, the particle size of the medium sand is 1.18-2.36 mm, and the particle size of the fine sand is 0.6-1.18 mm.
The preparation method comprises the following steps:
s1, weighing each component for later use according to the formula of the quick-hardening early-strength composite repair mortar;
s20: mechanically grinding and activating the fly ash to a particle size of 200 meshes to obtain activated fly ash, and carrying out ultrasonic treatment on the silica fume for 1h to obtain ultrasonically treated silica fume;
s2, uniformly stirring cement, the activated fly ash obtained in the step S20, the ultrasonically treated silica fume, the rubber powder, the water reducing agent, the component A and quartz sand to obtain a dry mixture;
s3, adding hybrid fibers into the dry mixture obtained in the step S2, and stirring for 20-45S to obtain a dry mixture doped with fibers;
s4, adding 45-65% of water in the formula amount into the component B, and uniformly mixing to obtain a component B solution;
s5, adding the B component solution obtained in the step S4 into the dry mixture doped with fibers obtained in the step S3, and quickly stirring for 30-45S to obtain a primary mixed material;
and S6, slowly adding the residual water in the formula into the primary mixed material obtained in the step S5, and stirring for 20-30S to obtain the rapid-hardening early-strength composite repair mortar.
The performance test of the quick-hardening early-strength composite repair mortar obtained in the embodiment is shown in table 7:
table 7 test results of properties of the quick hardening early strength type composite repair mortar obtained in example 7
As can be seen from the data in tables 1 to 7, the quick-hardening early-strength composite repair mortar obtained in the embodiment of the invention: the shortest initial setting time is 18min, the longest final setting time is 210min, the highest flexural strength of 8h reaches 4.5MPa, the compressive strength reaches 30.5MPa, the bonding strength with the original concrete reaches 1.6MPa, and the maximum shrinkage rate of 3 days is 0.024 percent.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (6)
1. The quick-hardening early-strength composite repair mortar is characterized by comprising the following components in percentage by weight: 5 to 10 percent of water, 20 to 30 percent of cement, 1 to 5 percent of silica fume, 1 to 5 percent of fly ash, 50 to 70 percent of quartz sand, 0.4 to 0.5 percent of composite early strength agent, 0.06 to 0.1 percent of water reducing agent, 1 to 5 percent of re-dispersible latex powder and 0.06 to 0.8 percent of hybrid fiber, wherein the hybrid fiber is basalt fiber and polypropylene fiber, the sum of the components satisfies 100 percent,
the composite early strength agent consists of a component A and a component B, wherein the component A is nano calcium carbonate whisker, the component B is a mixture of triisopropanolamine and aluminum sulfate,
the quartz sand consists of coarse sand, medium sand and fine sand, and the mass ratio of the coarse sand to the medium sand to the fine sand is (20-25): (15-25): (15-20), the grain size of the coarse sand is 2.36-4.75 mm, the grain size of the medium sand is 1.18-2.36 mm, the grain size of the fine sand is 0.6-1.18 mm,
the weight of the triisopropanolamine accounts for 0.005-0.025 percent of the total amount of the rapid-hardening early-strength composite repair mortar, the weight of the aluminum sulfate accounts for 0.1-0.3 percent of the total amount of the rapid-hardening early-strength composite repair mortar, and the weight of the nano calcium carbonate whisker accounts for 0.1-0.3 percent of the total amount of the rapid-hardening early-strength composite repair mortar.
2. The rapid-hardening early-strength composite repair mortar according to claim 1, wherein the hybrid fibers are basalt fibers and polypropylene fibers, the weight of the basalt fibers accounts for 0.05-0.5% of the total amount of the rapid-hardening early-strength composite repair mortar, and the weight of the polypropylene fibers accounts for 0.01-0.3% of the total amount of the rapid-hardening early-strength composite repair mortar.
3. The quick-hardening early-strength composite repair mortar of claim 1, wherein the water reducing agent is a polycarboxylic acid high-efficiency water reducing agent.
4. The quick-hardening early-strength composite repair mortar according to claim 1, wherein the redispersible latex powder is redispersible vinyl acetate/ethylene copolymer rubber powder.
5. A preparation method of quick-hardening early-strength composite repair mortar is characterized by comprising the following steps:
s1, weighing each component for later use according to the quick-hardening early-strength composite repair mortar of any one of claims 1 to 4;
s2, uniformly stirring cement, fly ash, silica fume, redispersible latex powder, a water reducing agent, the component A and quartz sand to obtain a dry mixture;
s3, adding hybrid fibers into the dry mixture obtained in the step S2, and stirring for 20-45S to obtain a dry mixture doped with fibers;
s4, adding 45-65% of water in the formula amount into the component B, and uniformly mixing to obtain a component B solution;
s5, adding the B component solution obtained in the step S4 into the dry mixture doped with fibers obtained in the step S3, and quickly stirring for 30-45S to obtain a primary mixed material;
and S6, slowly adding the residual water in the formula into the primary mixed material obtained in the step S5, and stirring for 20-30S to obtain the rapid-hardening early-strength composite repair mortar.
6. The method for preparing rapid hardening early strength composite repair mortar according to claim 5, further comprising step S20 between step S1 and step S2: mechanically grinding and activating the fly ash to obtain the activated fly ash with the particle size of 200 meshes, and carrying out ultrasonic treatment on the silica fume for 1h to obtain the ultrasonically treated silica fume.
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| CN111704421B (en) * | 2020-06-16 | 2022-06-10 | 中铁西南科学研究院有限公司 | Cement pavement thin layer repairing material and using method thereof |
| CN113105142B (en) * | 2021-04-24 | 2023-06-16 | 武汉理工大学 | Product concrete toughening functional component and preparation method and application thereof |
| CN114656223A (en) * | 2022-04-26 | 2022-06-24 | 交通运输部公路科学研究所 | PE fiber composite cement-based interface agent for improving fracture toughness of RCC (resin coated concrete) layer |
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