CN114180916B - Light high-strength anti-cracking self-repairing tuff concrete and preparation method thereof - Google Patents
Light high-strength anti-cracking self-repairing tuff concrete and preparation method thereof Download PDFInfo
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- CN114180916B CN114180916B CN202111496732.0A CN202111496732A CN114180916B CN 114180916 B CN114180916 B CN 114180916B CN 202111496732 A CN202111496732 A CN 202111496732A CN 114180916 B CN114180916 B CN 114180916B
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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
- C04B28/02—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 containing hydraulic cements other than calcium sulfates
- C04B28/10—Lime cements or magnesium oxide 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
- C04B2111/34—Non-shrinking or non-cracking materials
- C04B2111/343—Crack resistant 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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/40—Porous or lightweight 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
- C04B2201/20—Mortars, concrete or artificial stone characterised by specific physical values for the density
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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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Working Measures On Existing Buildindgs (AREA)
Abstract
The application relates to the technical field of concrete materials, and particularly discloses light-weight high-strength anti-cracking self-repairing tuff concrete and a preparation method thereof. The light high-strength anti-cracking self-repairing tuff concrete is mainly prepared from the following raw materials in parts by weight: tuff powder, cationic polyacrylamide and water; and B component: cement, silica fume, ceramsite, water reducing agent, air entraining agent, anti-cracking repairing agent, quicklime and water; the preparation method of the light high-strength anti-cracking self-repairing tuff concrete comprises the following steps: and (1) mixing the component A: uniformly mixing cationic polyacrylamide, water and tuff powder to obtain a mixture A; and (2) mixing the component B: uniformly mixing the raw materials of the component B to obtain a mixture B; (3) concrete preparation: and uniformly mixing the mixture A and the mixture B to obtain the catalyst. The self-repairing effect of the prepared tuff concrete during cracking is better.
Description
Technical Field
The application relates to the technical field of concrete materials, in particular to light high-strength anti-cracking self-repairing tuff concrete and a preparation method thereof.
Background
Concrete is a general name of composite materials which are prepared by mixing gel materials, aggregates and water according to a proper proportion and then are hardened for a certain time, and is the artificial civil engineering and construction material with the largest usage amount in the world. The concrete has high hardness, wide raw material sources and low cost, and is widely applied to structures such as antifouling, highways and the like. Concrete is not as resistant to corrosion as stone, and salt corrosion and ice corrosion can cause fine fracture of the structure of a concrete building, thereby causing holes, and when water enters the concrete building containing the holes, the building is easy to damage.
In order to prolong the durability and the service life of a concrete structure, measures such as microorganisms are researched at home and abroad to serve as a self-repairing material of a repairing carrier, and the self-repairing material has the problems that the self-repairing material is difficult to mix in concrete, the construction difficulty is high, and bacteria are difficult to produce in the high-alkalinity environment of the concrete, so that the self-repairing effect is poor when the concrete cracks.
Disclosure of Invention
In order to improve the self-repairing effect of concrete when cracking occurs, the application provides the light-weight high-strength anti-cracking self-repairing tuff concrete and the preparation method thereof.
In a first aspect, the application provides a light high-strength anti-cracking self-repairing tuff concrete, which adopts the following technical scheme:
a light-weight high-strength cracking-resistant self-repairing tuff concrete is mainly prepared from the following raw materials in parts by weight: 10-20 parts of tuff powder, 1-2 parts of cationic polyacrylamide and 6-10 parts of water; and B component: 40-60 parts of cement, 5-10 parts of silica fume, 30-40 parts of ceramsite, 1-2 parts of water reducing agent, 0.5-1 part of air entraining agent, 0.5-1 part of anti-cracking repairing agent, 3-5 parts of quick lime and 10-15 parts of water, wherein the anti-cracking repairing agent is at least two of calcium sulphoaluminate, calcium gluconate and modified 2-mercaptobenzothiazole, and the preparation method of the modified 2-mercaptobenzothiazole comprises the following steps: and adding the porous particles into the dissolved 2-mercaptobenzothiazole, carrying out vacuum impregnation operation, and drying to obtain the composite material.
Preferably, the porous microparticles are either porous polymer microspheres or porous ceramic microparticles, and preferably, the porous microparticles are porous ceramic microparticles.
Preferably, the modified 2-mercaptobenzothiazole is porous ceramic particles loaded with 2-mercaptobenzothiazole, and the specific surface area of the porous ceramic particles is 500m 2 The 2-mercaptobenzothiazole loading was 5 wt. -%.
Preferably, the 2-mercaptobenzothiazole is dissolved in acetone.
Preferably, the vacuum impregnation operation is carried out for a period of 12 to 36 hours.
Preferably, the tuff powder is ground by conventional rock grinding methods.
Preferably, the main chemical components of the tuff powder are as follows: 6.15% CaO,58.08% SiO 2 19.67% of Al 2 O 3 ，9.86％Fe 2 O 3 1.18% of MgO and 0.16% of SO 3 。
By adopting the technical scheme, the tuff powder, the silica fume and the quicklime are matched, the doping of the quicklime can provide a weak alkaline environment, can promote the hydration reaction of cement particles which are not hydrated or incompletely hydrated in the crack to continue, can better stimulate the activity of the silica fume and strengthen the volcanic ash reaction, and meanwhile, the tuff powder has an expansion effect, and the calcium carbonate precipitation generated by the carbonization reaction of the quicklime can repair the generated crack;
calcium sulphoaluminate in the anti-cracking repairing agent can improve the reaction activity of an unhydrated cement material to further form gel material hydrate so as to repair cracks generated in concrete, calcium gluconate can react with the unhydrated cement to form compact hydrated crystals so as to plug the cracks in the concrete, modified 2-mercaptobenzothiazole is porous particles loaded with 2-mercaptobenzothiazole, the porous particles can fill gaps in the concrete and effectively adsorb permeated water so as to reduce the permeation of the water to the deep parts of the cracks and further reduce the generation of the cracks, and the 2-mercaptobenzothiazole in the porous particles is released to form a repairing film so as to repair the cracks; the anti-cracking repairing agent is compounded by a plurality of components, so that the anti-cracking performance of concrete is improved conveniently, and meanwhile, the self-repairing function of the concrete is improved.
Preferably, the mass ratio of the tuff powder to the anti-cracking repairing agent to the cationic polyacrylamide is (15-18) to (0.6-0.9) to (1.5-1.8).
By adopting the technical scheme, the mass ratio of the tuff powder, the anti-cracking repairing agent and the cationic polyacrylamide is optimized, so that the formula of the tuff powder, the anti-cracking repairing agent and the cationic polyacrylamide reaches the optimal proportion, the effects of the tuff powder, the anti-cracking repairing agent and the cationic polyacrylamide on the concrete are further improved, the anti-cracking performance of the concrete is improved, and the anti-cracking repairing agent is matched with the tuff powder and the cationic polyacrylamide, so that the self-repairing performance of the concrete is improved.
Preferably, the anti-cracking repairing agent consists of any one of calcium sulphoaluminate and calcium gluconate and the modified 2-mercaptobenzothiazole according to the mass ratio of (4-8) to (2-3).
By adopting the technical scheme, calcium sulphoaluminate can react with unhydrated cement materials to form gel material hydrates, calcium gluconate can react with unhydrated cement to form compact hydrated crystals, any one of calcium sulphoaluminate and calcium gluconate is matched with the modified 2-mercaptobenzothiazole, and the modified 2-mercaptobenzothiazole has strong permeability and large diffusion radius in concrete, can bear the deformation of concrete caused by thermal expansion and cold contraction, and is convenient to bring the calcium sulphoaluminate and the calcium gluconate into the concrete, so that the repairing effect of the concrete when cracking is further improved, and the service life of the concrete is further prolonged.
Preferably, the anti-cracking repairing agent consists of calcium sulphoaluminate, calcium gluconate and modified 2-mercaptobenzothiazole according to the mass ratio of (1-3) to (3-4) to (1-2).
By adopting the technical scheme, the ratio of the three components of the crack resistance repairing agent is optimized, so that the ratio of the three components is more reasonable, the synergistic effect of the calcium sulphoaluminate, the calcium gluconate and the modified 2-mercaptobenzothiazole is further exerted, the crack resistance and the self-repairing performance of the concrete are further improved, the crack resistance repairing agent and the tuff powder are matched with each other, the performance of the concrete is improved from the two aspects of crack resistance and self-repairing, and the service life of the concrete is prolonged.
Preferably, the specific surface area of the tuff powder is 600-800m 2 /kg。
By adopting the technical scheme, the influence of the specific surface area of the tuff powder on the compressive strength of the concrete is larger, and the larger the specific surface area of the tuff powder is, the stronger the dense filling effect on the concrete is, so that the cracking resistance of the concrete is further improved.
Preferably, the water reducing agent consists of a polycarboxylic acid water reducing agent and a melamine water reducing agent according to the mass ratio of (1-2) to (4-5).
By adopting the technical scheme, the melamine water reducer and the polycarboxylic acid water reducer are compounded and then have good compatibility with cement, tuff powder and the like, the temperature adaptability is good, the concrete shrinkage can be obviously reduced, the cracking condition of the concrete is reduced, and simultaneously, the effects of steric hindrance and electrostatic repulsive force effect are favorably considered, so that the dispersing ability and the dispersion maintaining performance of the cement are enhanced, and the cracking condition of the concrete is further reduced.
Preferably, the air entraining agent is sodium lignosulfonate.
By adopting the technical scheme, the surface tension and the interface energy of water can be obviously reduced by adding the sodium lignosulfonate, so that a water solution generates a plurality of tiny closed bubbles in the stirring process, the existence of the bubbles increases the elastic deformation of concrete, the elastic modulus is reduced, and the anti-cracking performance of the concrete is further improved.
Preferably, the coating also comprises 1-2 parts by weight of filler, wherein the filler is at least two of silica fume, lithium carbonate and metakaolin.
Preferably, the specific surface area of the micro silicon powder is 400-16000m 2 /kg。
By adopting the technical scheme, the silica fume has a ball effect, the workability and integrity of the material can be improved, the generation of cracks during construction can be effectively inhibited, and the risk of cracking of concrete is reduced; the lithium carbonate can adjust the hydration process of the gel material, shorten the gelation time of the gel material and reduce the rate and the heat release amount of later hydration heat release, thereby further inhibiting the generation of cracks during construction and further reducing the generation of cracks; metakaolin can generate an expansion crystalline hydration product in the concrete, so that slight expansion is generated, the shrinkage generated in the hardening process is compensated, the cracking condition of the concrete is reduced, the compactness of the concrete is increased, and the crack resistance of the concrete is improved; after the components of the filler are compounded, the two filler components are mutually matched and have synergistic effect, so that the crack resistance of the concrete is further improved, and the cracked concrete is convenient to repair.
Preferably, the filler consists of micro silicon powder, lithium carbonate and metakaolin according to the mass ratio of (2-3) to (4-5).
By adopting the technical scheme, the proportion of each component of the filling agent is optimized, so that the proportion of the three components reaches the best, the compactness of concrete is further improved through the synergistic effect of the micro silicon powder, the lithium carbonate and the metakaolin, the ball effect of the micro silicon powder is further improved, the lithium carbonate and the metakaolin are mixed with other materials of the concrete more uniformly, the compatibility is better, the hydration regulation process of the lithium carbonate is further improved, the metakaolin is promoted to be filled into the pores of the concrete simultaneously, the three components are mixed with each other, and the anti-cracking performance of the concrete is further improved.
In a second aspect, the application provides a preparation method of the lightweight high-strength anti-cracking self-repairing tuff concrete, which adopts the following technical scheme:
a preparation method of light-weight high-strength anti-cracking self-repairing tuff concrete comprises the following steps,
(1) Mixing the component A: mixing cationic polyacrylamide with water to obtain cationic polyacrylamide modified liquid, and uniformly mixing the cationic polyacrylamide modified liquid with tuff powder to obtain a mixture A;
(2) Mixing the component B: uniformly mixing the raw materials of the component B to obtain a mixture B; when the filling agent needs to be added, adding the filling agent in the current step;
(3) Preparing concrete: and (3) uniformly mixing the mixture A obtained in the step (1) and the mixture B obtained in the step (2) to obtain the catalyst.
By adopting the technical scheme, the cationic polyacrylamide is matched with the tuff powder, the cationic polyacrylamide can inhibit the expansion effect of the tuff powder, and can be filled into cracks of concrete after being flocculated and agglomerated with the tuff powder, so that the structure of the concrete is tighter, the cationic polyacrylamide has good hydrophilic performance, a large amount of water can be changed into a gel, the water-locking capacity is strong, and the water permeability is reduced; the components of the anti-cracking repairing agent in the concrete are matched with each other, so that when the concrete cracks, the anti-cracking repairing agent is dispersed to the cracking position, the repairing of the cracked concrete is completed, and the anti-cracking performance of the concrete is further improved.
In summary, the present application has the following beneficial effects:
1. through mutual cooperation of tuff powder, silica fume, quick lime in the light weight, high strength and anti-cracking self-repairing tuff concrete of this application to improve the self-repairing function of concrete, improve the anti-cracking performance of concrete simultaneously.
2. The crack-resistant repairing agent in the light high-strength crack-resistant self-repairing tuff concrete is compounded by multiple components, so that the repairing effect of the concrete in the cracking condition is further improved.
Detailed Description
The present application will be described in further detail with reference to examples.
Optionally, the cement is a grade 52.2 portland cement.
Optionally, the silica fume has a specific surface area of 24000m 2 Over/kg, and SiO 2 The content is more than 95 wt%.
Optionally, the ceramsite is crushed stone type shale ceramsite, and the particle size of the ceramsite is 5-20mm.
Alternatively, the cationic polyacrylamide is produced by saint-son chemical company, inc.
Alternatively, the 2-mercaptobenzothiazole is manufactured by Shanghai to Xin chemical Co., ltd.
Examples
Example 1
The light-weight high-strength anti-cracking self-repairing tuff concrete is prepared from the following raw materials in parts by weight: the component A comprises: 10kg of tuff powder, 1kg of cationic polyacrylamide and 6kg of water; and B component: 40kg of cement, 5kg of silica fume, 30kg of ceramsite, 1kg of water reducing agent, 0.5kg of air entraining agent, 0.5kg of anti-cracking repairing agent, 3kg of quicklime and 10kg of water, wherein the water reducing agent is a polycarboxylic acid water reducing agent, the air entraining agent is sodium lignosulfonate, and the anti-cracking repairing agent consists of calcium sulphoaluminate and calcium gluconate according to the mass ratio of 4; the tuff powder is obtained by grinding through a conventional rock ore grinding method, and the main chemical components of the tuff powder are as follows: 6.15% of CaO,58.08% of SiO 2 19.67% of Al 2 O 3 ，9.86％Fe 2 O 3 1.18% of MgO and 0.16% of SO 3 (ii) a The specific surface area of the tuff powder is 700m 2 /kg。
The preparation method of the light-weight high-strength anti-cracking self-repairing tuff concrete comprises the following steps: and (1) mixing the component A: mixing cationic polyacrylamide with water to obtain cationic polyacrylamide modified liquid, and uniformly mixing the cationic polyacrylamide modified liquid with tuff powder to obtain a mixture A;
(2) Mixing the component B: uniformly mixing cement, silica fume, ceramsite, water reducer, air entraining agent, anti-cracking repairing agent, quicklime and water to obtain a mixture B;
(3) Preparing concrete: and (3) uniformly mixing the mixture A obtained in the step (1) and the mixture B obtained in the step (2) to obtain the catalyst.
Examples 2 to 5
Examples 2 to 5 respectively provide light-weight, high-strength, crack-resistant and self-repairing tuff concrete with different raw material component ratios, the components of the light-weight, high-strength, crack-resistant and self-repairing tuff concrete corresponding to each example are shown in table 1, and the unit of the raw material ratio is kg.
Table 1 examples 1-5 composition ratios of lightweight, high-strength, crack-resistant, self-repairing tuff concrete
The lightweight, high-strength, crack-resistant, self-repairing tuff concrete of examples 2-5 differs from example 1 in that: the light high-strength anti-cracking self-repairing tuff concrete is different in component proportion, the water reducing agent is composed of a polycarboxylic acid water reducing agent and a melamine water reducing agent according to the mass ratio of 2.
The preparation method of the lightweight high-strength anti-cracking self-repairing tuff concrete of the embodiments 2-5 is completely the same as that of the embodiment 1.
Example 6
The present embodiment is different from embodiment 4 in that: the anti-cracking repairing agent consists of calcium sulphoaluminate and modified 2-mercaptobenzothiazole according to a mass ratio of 4: adding porous ceramic particles into the dissolved 2-mercaptobenzothiazole, carrying out vacuum impregnation operation, and drying to obtain the porous ceramic particles; wherein, the 2-mercaptobenzothiazole is dissolved in acetone, and the mass ratio of the 2-mercaptobenzothiazole to the acetone is 1; the time of the vacuum impregnation operation is 12 to 36 hours; the specific surface area of the porous ceramic particles was 500m 2 Per g, 2-mercaptobenzothiazole loadingIs 5wt%; the rest was exactly the same as in example 4.
The preparation method of the lightweight high-strength cracking-resistant self-repairing tuff concrete of the embodiment is completely the same as that of the embodiment 4.
Example 7
This embodiment is different from embodiment 6 in that: the anti-cracking repairing agent consists of calcium gluconate and modified 2-mercaptobenzothiazole according to the mass ratio of 8 to 3, and the rest is completely the same as that in the embodiment 6.
The preparation method of the lightweight high-strength cracking-resistant self-repairing tuff concrete of the embodiment is completely the same as that of the embodiment 6.
Example 8
The present embodiment is different from embodiment 6 in that: the anti-cracking repairing agent consists of calcium sulphoaluminate, calcium gluconate and modified 2-mercaptobenzothiazole according to the mass ratio of 1.
The preparation method of the lightweight high-strength cracking-resistant self-repairing tuff concrete of the embodiment is completely the same as that of the embodiment 6.
Example 9
The present embodiment is different from embodiment 6 in that: the anti-cracking repairing agent is prepared from calcium sulphoaluminate, calcium gluconate and modified 2-mercaptobenzothiazole according to the mass ratio of 3; 2, the rest was exactly the same as example 6.
The preparation method of the lightweight high-strength cracking-resistant self-repairing tuff concrete of the embodiment is completely the same as that of the embodiment 6.
Example 10
The present embodiment is different from embodiment 1 in that: and (2) component A: 10kg of tuff powder, 1kg of cationic polyacrylamide and 6kg of water; and B component: 40kg of cement, 5kg of silica fume, 30kg of ceramsite, 1kg of water reducing agent, 0.5kg of air entraining agent, 0.5kg of anti-cracking repairing agent, 3kg of quick lime, 1kg of filling agent and 10kg of water, wherein the filling agent is composed of micro silicon powder and lithium carbonate according to the mass ratio of 1 2 The rest was the same as in example 1.
The preparation method of the lightweight high-strength cracking-resistant self-repairing tuff concrete of the embodiment is different from that of the embodiment 1 in that: and (3) uniformly mixing cement, silica fume, ceramsite, water reducing agent, air entraining agent, anti-cracking repairing agent, quick lime, water and filler in the step (2) to obtain a mixture B, wherein the rest are completely the same as those in the embodiment 1.
Example 11
The present embodiment is different from embodiment 9 in that: the component A comprises: 16kg of tuff powder, 1.7kg of cationic polyacrylamide and 8kg of water; and B component: 50kg of cement, 8kg of silica fume, 35kg of ceramsite, 1.5kg of water reducing agent, 0.8kg of air entraining agent, 0.8kg of anti-cracking repairing agent, 4kg of quicklime, 1kg of filling agent and 13kg of water, wherein the filling agent consists of silica fume and lithium carbonate according to the mass ratio of 1 2 The rest was exactly the same as example 9,/kg.
The preparation method of the lightweight high-strength cracking-resistant self-repairing tuff concrete of the embodiment is different from that of the embodiment 9 in that: and (3) uniformly mixing cement, silica fume, ceramsite, water reducing agent, air entraining agent, anti-cracking repairing agent, quicklime, water and filler in the step (2) to obtain a mixture B, wherein the rest are completely the same as those in the embodiment 9.
Example 12
This embodiment is different from embodiment 11 in that: the filler consists of silica fume, lithium carbonate and metakaolin according to a mass ratio of 2.
The preparation method of the lightweight high-strength cracking-resistant self-repairing tuff concrete of the embodiment is completely the same as that of the embodiment 11.
Example 13
This embodiment is different from embodiment 11 in that: the filler consists of silica fume, lithium carbonate and metakaolin according to the mass ratio of 3.
The preparation method of the lightweight high-strength cracking-resistant self-repairing tuff concrete of the embodiment is completely the same as that of the embodiment 11.
Comparative example
Comparative example 1
This comparative example differs from example 1 in that: and (2) component A: 7kg of tuff powder, 1kg of cationic polyacrylamide and 5kg of water; and B component: 20kg of cement, 3kg of silica fume, 45kg of ceramsite, 0.1kg of water reducing agent, 0.5kg of air entraining agent, 0.1kg of anti-cracking repairing agent, 3kg of quicklime and 10kg of water, and the rest is completely the same as the embodiment 1.
The preparation method of the lightweight high-strength anti-cracking self-repairing tuff concrete of the comparative example is completely the same as that of the example 1.
Comparative example 2
This comparative example differs from example 1 in that: and (2) component A: 11kg of tuff powder and 6kg of water, the rest being exactly the same as in example 1.
The preparation method of the lightweight high-strength anti-cracking self-repairing tuff concrete of the comparative example is completely the same as that of the example 1.
Comparative example 3
The comparative example differs from example 1 in that: the component A comprises: 10kg of tuff powder, 1kg of cationic polyacrylamide and 6kg of water; and B component: 40kg of cement, 8kg of silica fume, 30kg of ceramsite, 1kg of water reducing agent, 0.5kg of air entraining agent, 0.5kg of anti-cracking repairing agent and 10kg of water, and the rest is completely the same as the embodiment 1.
The preparation method of the light-weight high-strength anti-cracking self-repairing tuff concrete of the comparative example is completely the same as that of the example 1.
Comparative example 4
This comparative example differs from example 1 in that: the component A comprises: 10kg of tuff powder, 1kg of cationic polyacrylamide and 6kg of water; and B component: 40kg of cement, 30kg of ceramsite, 1kg of water reducing agent, 0.5kg of air entraining agent, 0.5kg of anti-cracking repairing agent, 8kg of quicklime and 10kg of water, and the rest is completely the same as the embodiment 1.
The preparation method of the lightweight high-strength anti-cracking self-repairing tuff concrete of the comparative example is completely the same as that of the example 1.
Comparative example 5
This comparative example differs from example 1 in that: and (2) component A: 18kg of tuff powder, 1kg of cationic polyacrylamide and 6kg of water; and B component: 40kg of cement, 30kg of ceramsite, 1kg of water reducing agent, 0.5kg of air entraining agent, 0.5kg of anti-cracking repairing agent and 10kg of water, and the rest is completely the same as the embodiment 1.
The preparation method of the light-weight high-strength anti-cracking self-repairing tuff concrete of the comparative example is completely the same as that of the example 1.
Comparative example 6
The comparative example differs from example 1 in that: the crack-resistant repairing agent is calcium sulphoaluminate, and the rest is completely the same as the example 1.
The preparation method of the light-weight high-strength anti-cracking self-repairing tuff concrete of the comparative example is completely the same as that of the example 1.
Comparative example 7
This comparative example differs from example 1 in that: the anti-cracking repairing agent is calcium gluconate, and the rest is completely the same as the example 1.
The preparation method of the lightweight high-strength anti-cracking self-repairing tuff concrete of the comparative example is completely the same as that of the example 1.
Comparative example 8
The comparative example differs from example 1 in that: the crack resistance repairing agent is modified 2-mercaptobenzothiazole, and the preparation method of the modified 2-mercaptobenzothiazole comprises the following steps: adding porous ceramic particles into the dissolved 2-mercaptobenzothiazole, carrying out vacuum impregnation operation, and drying to obtain the porous ceramic particles; wherein the 2-mercaptobenzothiazole is dissolved in acetone, and the mass ratio of the 2-mercaptobenzothiazole to the acetone is 1; the time of the vacuum impregnation operation is 12 to 36 hours; the specific surface area of the porous ceramic fine particles was 500m 2 The load capacity of the 2-mercaptobenzothiazole is 5 weight percent; the rest is exactly the same as in example 1.
The preparation method of the lightweight high-strength anti-cracking self-repairing tuff concrete of the comparative example is completely the same as that of the example 1.
Performance test
And (3) detecting the mechanical property of the concrete: the mechanical properties of the lightweight high-strength cracking-resistant self-repairing tuff concrete obtained in the examples 1-13 and the comparative examples 1-8 are tested by referring to the test method in GB/T50081-2002 Standard for mechanical Properties test methods of ordinary concrete, and the measured results are shown in Table 2.
And (3) detecting the durability of the concrete: the light-weight high-strength anti-cracking self-repairing tuff concrete obtained in the embodiments 1-13 and the comparative examples 1-8 is subjected to durability test by referring to a test method in GB/T50082-2009 Standard test method for Long-term Performance and durability of common concrete, and the measured results are shown in Table 2.
TABLE 2 Performance test results of lightweight, high-strength, crack-resistant and self-repairing tuff concrete prepared in examples 1 to 13 and comparative examples 1 to 8
By combining the example 1 and the comparative examples 1 to 8 and combining the table 2, the cationic polyacrylamide can reduce the expansion degree of the tuff powder, so that the compressive strength of the prepared light high-strength anti-cracking self-repairing tuff concrete is improved, and the initial cracking time of the concrete is prolonged; the self-repairing capability of the tuff powder to concrete cracks is enhanced under the coordination of the silica fume and the quicklime; the anti-cracking repairing agent is obtained by compounding various materials, so that the self-repairing capability of concrete is further improved, the cracking of the concrete is further reduced, and the compressive strength of the prepared concrete is improved; when the raw material proportions of the components of the concrete are different, the impact on the compressive strength and the cracking resistance of the prepared concrete is large.
By combining the examples 1 to 5 and table 2, it can be seen that the ratio of the raw materials of each component of the concrete is optimized, so that the ratio of each component of the concrete is more reasonable, the compressive strength and the anti-cracking performance of the prepared concrete are improved, and the compressive strength and the anti-cracking performance of the concrete are better when the addition amounts of the tuff powder, the anti-cracking repairing agent and the cationic polyacrylamide are increased.
By combining the examples 6 to 9 and the table 2, it can be seen that the compressive strength and the cracking resistance of the obtained concrete are better when the anti-cracking repairing agent is obtained by compounding three components by optimizing the compounding ratio of the components of the anti-cracking repairing agent.
By combining the examples 10 to 13 and table 2, it can be seen that the addition of the filler facilitates further improvement of the compressive strength of the obtained concrete, and when the filler is obtained by compounding three components, the three components are mutually matched and cooperate with each other, thereby facilitating further improvement of the compressive strength and the anti-cracking performance of the concrete.
The present embodiment is only for explaining the present application, and it is not limited to the present application, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present application.
Claims (5)
1. The light high-strength anti-cracking self-repairing tuff concrete is characterized by being mainly prepared from the following raw materials in parts by weight: 10-20 parts of tuff powder, 1-2 parts of cationic polyacrylamide and 6-10 parts of water; and B component: 40-50 parts of cement, 5-10 parts of silica fume, 30-40 parts of ceramsite, 1-2 parts of water reducing agent, 0.5-1 part of air entraining agent, 0.5-1 part of anti-cracking repairing agent, 3-5 parts of quick lime and 10-15 parts of water, wherein the mass ratio of the tuff powder, the anti-cracking repairing agent and the cationic polyacrylamide is (15-18) to (0.6-0.9) to (1.5-1.8); the anti-cracking repairing agent consists of calcium sulphoaluminate, calcium gluconate and modified 2-mercaptobenzothiazole according to the mass ratio of (1-3) to (3-4) to (1-2), and the preparation method of the modified 2-mercaptobenzothiazole comprises the following steps: and (3) adding the porous particles into the dissolved 2-mercaptobenzothiazole, carrying out vacuum impregnation operation, and drying to obtain the porous particle.
2. The lightweight high-strength cracking-resistant self-repairing tuff concrete as claimed in claim 1, wherein: the specific surface area of the tuff powder is 600-800m 2 /kg。
3. The lightweight high-strength cracking-resistant self-repairing tuff concrete as claimed in claim 1, wherein: the water reducing agent consists of a polycarboxylic acid water reducing agent and a melamine water reducing agent according to the mass ratio of (1-2) to (4-5).
4. The lightweight high-strength cracking-resistant self-repairing tuff concrete as claimed in claim 1, wherein: the air entraining agent is sodium lignosulfonate.
5. A preparation method of the lightweight high-strength anti-cracking self-repairing tuff concrete as claimed in any one of claims 1-4, characterized in that: comprises the following steps of (a) carrying out,
(1) Mixing the component A: mixing cationic polyacrylamide with water to obtain cationic polyacrylamide modified liquid, and uniformly mixing the cationic polyacrylamide modified liquid with tuff powder to obtain a mixture A;
(2) Mixing the component B: uniformly mixing the raw materials of the component B to obtain a mixture B;
(3) Preparing concrete: and (3) uniformly mixing the mixture A obtained in the step (1) and the mixture B obtained in the step (2) to obtain the catalyst.
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| WO2021008341A1 (en) * | 2019-07-18 | 2021-01-21 | 华南理工大学 | Cement-based material crack self-repairing agent capable of curing corrosive sea water ions, and preparation method therefor and application thereof |
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