CN110845199A - Concrete and preparation method thereof - Google Patents
Concrete and preparation method thereof Download PDFInfo
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- CN110845199A CN110845199A CN201911243074.7A CN201911243074A CN110845199A CN 110845199 A CN110845199 A CN 110845199A CN 201911243074 A CN201911243074 A CN 201911243074A CN 110845199 A CN110845199 A CN 110845199A
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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
- C04B28/04—Portland cements
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F283/00—Macromolecular compounds obtained by polymerising monomers on to polymers provided for in subclass C08G
- C08F283/06—Macromolecular compounds obtained by polymerising monomers on to polymers provided for in subclass C08G on to polyethers, polyoxymethylenes or polyacetals
- C08F283/065—Macromolecular compounds obtained by polymerising monomers on to polymers provided for in subclass C08G on to polyethers, polyoxymethylenes or polyacetals on to unsaturated polyethers, polyoxymethylenes or polyacetals
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F292/00—Macromolecular compounds obtained by polymerising monomers on to inorganic 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
- C04B2111/34—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
- 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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- Polymers & Plastics (AREA)
- Inorganic Chemistry (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses concrete and a preparation method thereof, and belongs to the technical field of tubular pile concrete. The preparation method comprises the following steps: a, roasting the composite powder comprising the diatomite and the fly ash at the temperature of 350-370 ℃; adding the roasted composite powder into an ethanol solution, dropwise adding a silane coupling agent aqueous solution, stirring, removing the solvent, and drying in vacuum to obtain modified composite powder; mixing methyl allyl polyoxyethylene ether, modified composite powder, an oxidant in a redox initiator, a chain transfer agent and deionized water, heating to 58-62 ℃, dropwise adding acrylic acid and a reducing agent in the redox initiator to carry out polymerization reaction, cooling to obtain a product liquid, adjusting the pH of the product liquid to 6-6.5, and stirring to obtain a water reducing agent; and c, uniformly stirring the cement, the silica fume, the stone, the sand and the water, adding the water reducing agent and the basalt fiber, and uniformly stirring to obtain the concrete. The concrete has high splitting tensile strength and high compression resistance, and can improve the phenomena of deformation, fracture and the like which easily occur to the inclined supporting tubular pile.
Description
Technical Field
The invention relates to the technical field of tubular pile concrete, in particular to concrete and a preparation method thereof.
Background
The inclined supporting tubular pile of the foundation pit is used as a deep pit anti-sliding supporting and blocking structure, has the advantages of being strong in supporting and blocking capacity, saving land space and construction cost, effectively resisting horizontal load, reducing pile top displacement and pile body bending moment distribution, improving pile body displacement form and the like, and is widely applied to foundation pit supporting construction.
Under the condition that the foundation pit is deep, loads such as horizontal pressure and the like borne by the inclined supporting tubular pile are also greatly increased, and the phenomena of deformation, fracture and the like are easy to occur. The great part of the reason for this phenomenon is that the concrete used for manufacturing the inclined supporting tubular pile has poor mechanical properties such as splitting tensile property, compressive resistance and the like.
Therefore, the development of new concrete with excellent mechanical properties such as splitting tensile property, compressive resistance and the like is of great significance for improving the phenomena of deformation, fracture and the like easily occurring in the service process of the inclined supporting tubular pile.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide the following steps: provides a concrete to achieve the effect of improving the mechanical properties such as splitting tensile property, compressive resistance and the like.
The first purpose of the invention is realized by the following technical scheme:
the concrete comprises the following components in parts by weight: 340 parts of cement 310-90 parts, 15-20 parts of silica fume, 1150 parts of stone 1050-90 parts, 820 parts of sand 770-820 parts, 170 parts of water 150-8 parts, 5-8 parts of water reducing agent and 25-35 parts of basalt fiber,
the preparation method of the water reducing agent comprises the following steps: according to the weight portion, the modified acrylic acid modified polyvinyl ether modified acrylic acid,
the preparation method of the modified composite powder comprises the following steps: roasting the composite powder at the temperature of 350-370 ℃ for 2-3h, wherein the composite powder comprises diatomite and fly ash in a weight ratio of 1: 1.3-1.7; adding 100 parts of the roasted composite powder into an ethanol solution, uniformly stirring, adjusting the pH to 4.5-4.6, pre-stirring at 65-70 ℃, dropwise adding 90-110 parts of a silane coupling agent aqueous solution with the mass concentration of 4-6%, continuously stirring for 2-3h, filtering under reduced pressure to remove the solvent, and drying under vacuum to obtain the modified composite powder.
By adopting the scheme, the content of basalt fibers is properly increased in the component formula of the concrete. The basalt fiber has good stability, and also has various excellent performances of electrical insulation, corrosion resistance, combustion resistance, high temperature resistance and the like. The improvement of the doping amount of the basalt fibers can effectively inhibit the segregation tendency of concrete, remarkably reduce or even completely eliminate cracks generated after the concrete is poured, and thus improve the mechanical properties of the concrete, such as the splitting tensile property, the compressive resistance and the like.
However, the improvement of the blending amount of the basalt fiber effectively controls concrete cracks, reduces the fluidity of concrete to a certain extent, is not beneficial to maintaining or improving the compactness of concrete, and easily has adverse effects on mechanical properties such as the splitting tensile property and the compressive resistance of concrete. Therefore, the synthesis process of the water reducing agent is modified according to the component proportion of the concrete.
The diatomite is a siliceous mineral and mainly comprises amorphous SiO2And also contains a small amount of impurities. SiO of diatomaceous earth2The content is more than 80 percent, and a small amount of impurities mainly comprise Al2O3、Fe2O3、CaO、MgO、K2O、Na2O、P2O5And organic matter. Diatomite is porous and is commonly used as an adsorbent, and reports that the diatomite is used for modifying a synthetic water reducing agent and is used for preparing concrete are not found.
The fly ash being derived from coal after combustionThe fine ash collected from the flue gas is the main solid waste discharged from coal-fired power plants, and the main oxide composition comprises SiO2、Al2O3、FeO、Fe2O3CaO and TiO2. The fly ash particles are in a porous honeycomb structure, have large specific surface area and high adsorption activity. The activity of the fly ash is mainly from active SiO2(vitreous SiO)2) And active Al2O3(vitreous body Al)2O3) The water reducing agent can be directly mixed into concrete as an admixture, but the report that the water reducing agent is used for modifying a synthetic water reducing agent and is used for preparing concrete is not found.
In the synthesis process of the water reducing agent, composite powder containing diatomite and fly ash is adopted. In the preparation of the modified composite powder, the composite powder is subjected to double modification means of firstly roasting and then treating by using a silane coupling agent. Experiments prove that the modified composite powder prepared by the method and other raw materials jointly participate in polymerization reaction, the obtained water reducing agent has the characteristic of remarkably improving the fluidity of concrete, and can make up the defect of poor fluidity of concrete caused by a large amount of basalt fibers, so that the concrete with high splitting tensile strength and high compressive strength is obtained by matching with the characteristic of inhibiting concrete cracks by the basalt fibers, and the phenomena of deformation, breakage and the like of the inclined supporting tubular pile prepared from the concrete in the service process can be improved. The above characteristics of the water reducing agent of the present invention may be related to the introduction of silicon hydroxyl groups into the water reducing agent by the addition of the modified composite powder.
The invention is further configured to: the mud content of the stone is 5-6%, and the mud content of the sand is 5-6%.
It is known that the content of mud in stone and sand materials used in concrete has an important influence on the mechanical properties of concrete, for reasons including: on one hand, the stone and sand raw materials with over-high mud content can directly reduce the interface strength of particles in the concrete, thereby causing adverse effect on the mechanical property of the concrete; on the other hand, the polycarboxylic acid water reducing agent is very sensitive to the mud content in concrete, and cannot achieve the effect of improving the fluidity of concrete so as to improve the mechanical property of the concrete. Generally, in order to reduce the adverse effect of the content of sludge in the stone or sand raw material on the concrete, the content of sludge in the stone or sand raw material needs to be controlled to 3 to 4% or less.
In the invention, stone and sand with mud content of 5-6% can be adopted, and the tensile strength and compressive strength of the fracture can be kept at higher level. This shows that the concrete prepared by the invention is not sensitive to the mud content in the adopted stones and sands, which has great practical application value in practice.
The invention is further configured to: the composite powder comprises diatomite and fly ash in a weight ratio of 1: 1.4-1.5.
Experimental data show that the weight ratio of the diatomite to the fly ash in the preparation process of the water reducing agent has an important influence on the concrete, and aiming at the ratio of the diatomite to the fly ash, when the weight ratio of the diatomite to the fly ash is within the numerical value range, the splitting tensile strength and the compressive strength of the obtained concrete are more excellent.
The invention is further configured to: in the step a of the preparation method of the modified composite powder, the roasting temperature is 355-360 ℃.
Experimental data show that the control of the roasting temperature in the preparation process of the water reducing agent has great influence on the concrete, and aiming at the proportion of the water reducing agent, when the roasting temperature is 375-380 ℃, the cleavage tensile strength and the compressive strength of the obtained concrete are more excellent. This may be related to the influence of over-high or under-low temperature on the ability of the modified composite powder to introduce silicon hydroxyl groups into the water reducing agent, and thus on the improvement of concrete fluidity by the water reducing agent.
The invention is further configured to: the silane coupling agent is methacryloyloxymethyl triethoxysilane.
The invention is further configured to: the oxidizing agent is potassium persulfate, and the reducing agent is sodium bisulfite.
The invention is further configured to: the chain transfer agent is sodium methallyl sulfonate.
The invention is further configured to: the temperature of the polymerization reaction is 58-62 ℃.
Object two of the present invention: the preparation method of the concrete comprises the following steps:
a, preparing modified composite powder:
roasting the composite powder at the temperature of 350-370 ℃ for 2-3h, wherein the composite powder comprises diatomite and fly ash in a weight ratio of 1: 1.3-1.7; adding 100 parts of the roasted composite powder into an ethanol solution, uniformly stirring, adjusting the pH to 4.5-4.6, pre-stirring at 65-70 ℃, dropwise adding 90-110 parts of a silane coupling agent aqueous solution with the mass concentration of 4-6%, continuously stirring for 2-3h, filtering under reduced pressure to remove the solvent, and drying under vacuum to obtain modified composite powder;
b, preparing a water reducing agent:
mixing 100 parts of methyl allyl polyoxyethylene ether, 15-20 parts of modified composite powder, 2-2.5 parts of oxidant in redox initiator, 3-3.5 parts of chain transfer agent and deionized water, heating to 58-62 ℃, simultaneously dropwise adding 22-27 parts of acrylic acid and 0.3-0.5 part of reducing agent in redox initiator for polymerization reaction, cooling to obtain product liquid, adjusting the pH of the product liquid to 6-6.5, preserving heat and stirring to obtain a water reducing agent;
c, preparing concrete:
and (3) uniformly stirring cement, silica fume, stone, sand and water, adding the water reducing agent and the basalt fiber, and uniformly stirring to obtain the concrete.
In conclusion, the invention has the following beneficial effects:
the invention improves the doping amount of basalt fibers in the formula of the concrete, and can effectively inhibit the concrete from generating cracks. Meanwhile, aiming at the condition that the large amount of doped basalt fibers is not beneficial to the fluidity of the concrete, thereby not being beneficial to the compactness and the mechanical property of the concrete, the preparation of the adopted water reducing agent is modified, the fluidity of the concrete is improved, the defects are made up, the finally obtained concrete has excellent splitting tensile property and compression resistance, and the phenomena of deformation, fracture and the like of the inclined supporting tubular pile prepared from the concrete in the service process can be improved.
Detailed Description
The present invention will be described in further detail below.
Introduction of raw materials
Diatomite is purchased from Henan super-win environmental protection science and technology limited, and the physical and chemical properties are shown in Table 1:
TABLE 1 physical and chemical Properties of diatomaceous Earth
Cement, P.O 42.5.5 portland cement;
silica fume with specific surface area of 16000m2Perkg, 28 days activity index 95%;
400-mesh fly ash, 80 percent of water requirement and 85 percent of 7-day activity index;
stone with particle size of 5-10mm and mud content of 5-6%;
sand, medium sand, the grain diameter is 0.35-0.5mm, and the mud content is 5-6%;
basalt fiber with fiber length of 6mm, fiber diameter of 16 μm and specific surface area of 2.6m2The hardness is 6 Moh;
methallyl polyoxyethylene ether, TPEG-2400, available from national mechanical chemical Co., Haian county;
acrylic acid (the content is more than or equal to 98 percent), potassium persulfate (the content is more than or equal to 99.5 percent), sodium bisulfite and sodium methallyl sulfonate (2-methyl-2-propylene-1-sodium sulfonate, the content is 98 percent) are purchased from national medicine group chemical reagent company Limited;
methacryloyloxymethyl triethoxysilane, 98% content, was purchased from Zhengzhou Jex chemical products Co.
Example 1
The preparation method of the concrete comprises the following steps:
a, preparing modified composite powder:
roasting the composite powder at 350 ℃ for 2h, wherein the composite powder comprises diatomite and fly ash in a weight ratio of 1: 1.3; preparing 500 parts of a solution A of absolute ethyl alcohol and water in a volume ratio of 1:1, 90 parts of a solution B of silane coupling agent methacryloxymethyl triethoxysilane water with a mass concentration of 4%, adding 100 parts of the calcined composite powder into the mixed solution A, uniformly stirring, adjusting the pH to 4.5, pre-stirring for 20min at 65 ℃, dropwise adding the solution B, continuously stirring for 2h, filtering under reduced pressure to remove the solvent, and drying for 10h at 80 ℃ in vacuum to obtain modified composite powder;
b, preparing a water reducing agent:
base solution: 100 parts of methyl allyl polyoxyethylene ether, 15 parts of modified composite powder, 3.5 parts of chain transfer agent sodium methyl propylene sulfonate, 2.5 parts of oxidizing agent potassium persulfate in redox initiator and 100 parts of deionized water;
solution A: 22 parts of acrylic acid and 40 parts of deionized water;
solution B: 0.3 part of reducing agent sodium bisulfite and 50 parts of deionized water in the redox initiator,
heating the base solution to 58 ℃, and simultaneously dropwise adding the solution A and the solution B into the base solution, wherein the dropwise adding time of the solution A is 1 hour, and the dropwise adding time of the solution B is 1.5 hours; after the solution A and the solution B are completely dripped, keeping the temperature and reacting for 35 min; adjusting the pH value to 6 by adopting a sodium hydroxide aqueous solution with the mass concentration of 32%, and stirring for 20min under the condition of heat preservation to obtain a water reducing agent;
c, preparing concrete:
and uniformly stirring 310 parts of cement, 20 parts of silica fume, 1050 parts of stone, 820 parts of sand and 150 parts of water, adding 8 parts of water reducing agent and 25 parts of basalt fiber, and uniformly stirring to obtain the concrete.
Example 2
The preparation method of the concrete comprises the following steps:
a, preparing modified composite powder:
roasting the composite powder at 357 ℃ for 2.5h, wherein the composite powder comprises diatomite and fly ash in a weight ratio of 1: 1.45; preparing 500 parts of a solution A of absolute ethyl alcohol and water in a volume ratio of 1:1, 100 parts of a solution B of silane coupling agent methacryloxymethyl triethoxysilane water with a mass concentration of 4-6%, adding 100 parts of the calcined composite powder into the mixed solution A, uniformly stirring, adjusting the pH to 4.55, pre-stirring at 67 ℃ for 25min, dropwise adding the solution B, continuously stirring for 2.5h, filtering under reduced pressure to remove the solvent, and drying at 80 ℃ under vacuum for 10h to obtain modified composite powder;
b, preparing a water reducing agent:
base solution: 100 parts of methyl allyl polyoxyethylene ether, 17 parts of modified composite powder, 3.2 parts of chain transfer agent sodium methyl propylene sulfonate, 2.3 parts of oxidizing agent potassium persulfate in redox initiator and 100 parts of deionized water;
solution A: 25 parts of acrylic acid and 40 parts of deionized water;
solution B: 0.4 part of reducing agent sodium bisulfite and 50 parts of deionized water in the redox initiator,
heating the base solution to 60 ℃, and simultaneously dropwise adding the solution A and the solution B into the base solution, wherein the dropwise adding time of the solution A is 1 hour, and the dropwise adding time of the solution B is 1.5 hours; after the solution A and the solution B are completely dripped, keeping the temperature and reacting for 35 min; adjusting the pH value to 6.2 by adopting a sodium hydroxide aqueous solution with the mass concentration of 32%, and stirring for 20min under the condition of heat preservation to obtain a water reducing agent;
c, preparing concrete:
uniformly stirring 325 parts of cement, 18 parts of silica fume, 1100 parts of stone, 790 parts of sand and 160 parts of water, adding 6 parts of water reducing agent and 30 parts of basalt fiber, and uniformly stirring to obtain the concrete.
Example 3
The preparation method of the concrete comprises the following steps:
a, preparing modified composite powder:
roasting the composite powder at 370 ℃ for 3h, wherein the composite powder comprises diatomite and fly ash in a weight ratio of 1: 1.7; preparing 500 parts of a solution A of absolute ethyl alcohol and water in a volume ratio of 1:1, preparing 110 parts of a solution B of silane coupling agent methacryloxymethyl triethoxysilane water with a mass concentration of 4-6%, adding 100 parts of the calcined composite powder into the mixed solution A, uniformly stirring, adjusting the pH to 4.6, pre-stirring at 70 ℃ for 30min, dropwise adding the solution B, continuously stirring for 3h, filtering under reduced pressure to remove the solvent, and drying at 80 ℃ in vacuum for 10h to obtain modified composite powder;
b, preparing a water reducing agent:
base solution: 100 parts of methyl allyl polyoxyethylene ether, 20 parts of modified composite powder, 3 parts of chain transfer agent sodium methyl propylene sulfonate, 2 parts of oxidizing agent potassium persulfate in redox initiator and 100 parts of deionized water;
solution A: 27 parts of acrylic acid and 40 parts of deionized water;
solution B: 0.5 part of reducing agent sodium bisulfite and 50 parts of deionized water in the redox initiator,
heating the base solution to 62 ℃, and simultaneously dropwise adding the solution A and the solution B into the base solution, wherein the dropwise adding time of the solution A is 1 hour, and the dropwise adding time of the solution B is 1.5 hours; after the solution A and the solution B are completely dripped, keeping the temperature and reacting for 35 min; adjusting the pH value to 6.5 by adopting a sodium hydroxide aqueous solution with the mass concentration of 32%, and stirring for 20min under the condition of heat preservation to obtain a water reducing agent;
c, preparing concrete:
340 parts of cement, 15 parts of silica fume, 1150 parts of stone, 770 parts of sand and 170 parts of water are uniformly stirred, 5 parts of water reducing agent and 35 parts of basalt fiber are added, and the mixture is uniformly stirred to obtain the concrete.
Example 4
The concrete is different from the concrete in the embodiment 2 in that in the step a, the composite powder comprises diatomite and fly ash in a weight ratio of 1: 1.3.
Example 5
The concrete is different from the concrete in the embodiment 2 in that in the step a, the composite powder comprises diatomite and fly ash in a weight ratio of 1: 1.7.
Example 6
The concrete is different from the concrete in the embodiment 2 in that in the step a, the composite powder comprises diatomite and fly ash in a weight ratio of 1: 1.4.
Example 7
The concrete is different from the concrete in the embodiment 2 in that in the step a, the composite powder comprises diatomite and fly ash in a weight ratio of 1: 1.5.
Example 8
A concrete, which is different from example 2 in that, in the step a, the firing temperature is 350 ℃.
Example 9
A concrete, which is different from example 2 in that, in the step a, the firing temperature is 370 ℃.
Example 10
A concrete, which is different from example 2 in that, in the step a, the firing temperature is 355 ℃.
Example 11
A concrete, which is different from example 2 in that, in the step a, the firing temperature is 360 ℃.
Comparative example 1
The concrete is different from the concrete in the embodiment 2 in that in the step a, the composite powder comprises diatomite and fly ash in a weight ratio of 1: 1.2.
Comparative example 2
The concrete is different from the concrete in the embodiment 2 in that in the step a, the composite powder comprises diatomite and fly ash in a weight ratio of 1: 1.8.
Comparative example 3
A concrete, which is different from example 2 in that, in the step a, the firing temperature is 340 ℃.
Comparative example 4
A concrete, which is different from example 2 in that, in the step a, the firing temperature is 380 ℃.
Comparative example 5
A concrete was prepared as described in example 2, except that a commercially available ordinary polycarboxylic acid water reducing agent obtained from Shandong Shangsheng building materials Co., Ltd was used.
Concrete performance testing
The strength of the concrete prepared in examples 1 to 11 and comparative examples 1 to 5 was measured according to the regulations of GB/T50081-2002 Standard test method for mechanical Properties on ordinary concrete, and the results are shown in Table 2.
TABLE 2 concrete Strength test results
As can be seen from Table 2, the concrete prepared in examples 1 to 3 had higher compressive strength and higher tensile strength at cleavage than those of comparative example 5. The invention improves the mixing amount of basalt fibers in the formula of the concrete, and can effectively inhibit the concrete from generating cracks. Meanwhile, aiming at the condition that the large amount of basalt fibers are doped to be not beneficial to the fluidity of the concrete, so that the compactness of the concrete is not beneficial, and the mechanical property of the concrete is reduced, the preparation of the adopted water reducing agent is modified, the fluidity of the concrete is improved, the defects are overcome, the finally obtained concrete has excellent anti-splitting performance and anti-compression performance, and the phenomena of deformation, fracture and the like of the inclined supporting tubular pile prepared from the concrete in the service process can be improved.
By combining examples 4-7 and comparative examples 1 and 2, it can be seen that, for the concrete formulation of the present invention, the weight ratio of the diatomaceous earth and the fly ash has an important influence on the anti-splitting performance and the anti-compression performance of the prepared concrete during the preparation process of the water reducing agent. When the weight ratio of the diatomite to the fly ash is 1:1.3-1.7, the concrete has better anti-splitting performance and anti-compression performance. When the weight ratio of the diatomite to the fly ash is 1:1.4-1.5, the anti-splitting performance and the anti-compression performance of the concrete are better. When the weight ratio of the diatomite to the fly ash exceeds the range of 1:1.3-1.7, the anti-cracking performance and the anti-compression performance of the concrete are greatly reduced.
By combining examples 8-11 and comparative examples 3 and 4, it can be seen that, aiming at the concrete formulation of the invention, in the preparation process of the water reducing agent, the roasting temperature of the modified composite powder has an important influence on the anti-splitting performance and the anti-compression performance of the prepared concrete. When the roasting temperature is 350-370 ℃, the anti-cracking performance and the anti-compression performance of the concrete are better. When the roasting temperature is 355-360 ℃, the anti-cracking performance and the anti-compression performance of the concrete are better. When the roasting temperature exceeds the range of 350-370 ℃, the anti-cracking performance and the anti-compression performance of the concrete are greatly reduced. This may be related to the influence of over-high or under-low temperature on the ability of the modified composite powder to introduce silicon hydroxyl groups into the water reducing agent, and thus on the improvement of concrete fluidity by the water reducing agent.
Furthermore, the above examples of the present invention used stones and sands containing mud in amounts of 5-6%, and the data showed that the split tensile strength and compressive strength were kept at any higher level. This shows that the concrete prepared by the invention is not sensitive to the mud content in the adopted stones and sands, which has great practical application value in practice.
The above-mentioned embodiments are merely illustrative and not restrictive, and those skilled in the art can modify the embodiments without inventive contribution as required after reading this specification, but only fall within the scope of the claims of the present invention.
Claims (9)
1. The concrete is characterized by comprising the following components in parts by weight: 340 parts of cement 310-90 parts, 15-20 parts of silica fume, 1150 parts of stone 1050-90 parts, 820 parts of sand 770-820 parts, 170 parts of water 150-8 parts, 5-8 parts of water reducing agent and 25-35 parts of basalt fiber,
the preparation method of the water reducing agent comprises the following steps: according to the weight portion, the modified acrylic acid modified polyvinyl ether modified acrylic acid,
the preparation method of the modified composite powder comprises the following steps: roasting the composite powder at the temperature of 350-370 ℃ for 2-3h, wherein the composite powder comprises diatomite and fly ash in a weight ratio of 1: 1.3-1.7; adding 100 parts of the roasted composite powder into an ethanol solution, uniformly stirring, adjusting the pH to 4.5-4.6, pre-stirring at 65-70 ℃, dropwise adding 90-110 parts of a silane coupling agent aqueous solution with the mass concentration of 4-6%, continuously stirring for 2-3h, filtering under reduced pressure to remove the solvent, and drying under vacuum to obtain the modified composite powder.
2. A concrete according to claim 1, wherein: the mud content of the stone is 5-6%, and the mud content of the sand is 5-6%.
3. A concrete according to claim 1, wherein: the composite powder comprises diatomite and fly ash in a weight ratio of 1: 1.4-1.5.
4. A concrete according to claim 1, wherein: in the step a of the preparation method of the modified composite powder, the roasting temperature is 355-360 ℃.
5. A concrete according to claim 1, wherein: the silane coupling agent is methacryloyloxymethyl triethoxysilane.
6. A concrete according to claim 1, wherein: the oxidizing agent is potassium persulfate, and the reducing agent is sodium bisulfite.
7. A concrete according to claim 1, wherein: the chain transfer agent is sodium methallyl sulfonate.
8. A concrete according to claim 1, wherein: the temperature of the polymerization reaction is 58-62 ℃.
9. A method of producing concrete according to any one of claims 1 to 8, comprising the steps of:
a, preparing modified composite powder:
roasting the composite powder at the temperature of 350-370 ℃ for 2-3h, wherein the composite powder comprises diatomite and fly ash in a weight ratio of 1: 1.3-1.7; adding 100 parts of the roasted composite powder into an ethanol solution, uniformly stirring, adjusting the pH to 4.5-4.6, pre-stirring at 65-70 ℃, dropwise adding 90-110 parts of a silane coupling agent aqueous solution with the mass concentration of 4-6%, continuously stirring for 2-3h, filtering under reduced pressure to remove the solvent, and drying under vacuum to obtain modified composite powder;
b, preparing a water reducing agent:
mixing 100 parts of methyl allyl polyoxyethylene ether, 15-20 parts of modified composite powder, 2-2.5 parts of oxidant in redox initiator, 3-3.5 parts of chain transfer agent and deionized water, heating to 58-62 ℃, simultaneously dropwise adding 22-27 parts of acrylic acid and 0.3-0.5 part of reducing agent in redox initiator for polymerization reaction, cooling to obtain product liquid, adjusting the pH of the product liquid to 6-6.5, preserving heat and stirring to obtain a water reducing agent;
c, preparing concrete:
and (3) uniformly stirring cement, silica fume, stone, sand and water, adding the water reducing agent and the basalt fiber, and uniformly stirring to obtain the concrete.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911243074.7A CN110845199B (en) | 2019-12-06 | 2019-12-06 | Concrete and preparation method thereof |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102079647A (en) * | 2010-11-30 | 2011-06-01 | 南京理工大学 | Basalt fiber reinforced cement matrix composite and preparation method thereof |
| CN104876468A (en) * | 2015-05-15 | 2015-09-02 | 武汉理工大学 | Functionalized polycarboxylic acid water reducer matched with silica fume and preparation method thereof |
| CN105384379A (en) * | 2015-12-10 | 2016-03-09 | 西安建筑科技大学 | White carbon black modified polycarboxylic acid water reducer and preparation method thereof |
| CN105622862A (en) * | 2015-12-28 | 2016-06-01 | 沈阳华盈环保材料有限公司 | Concrete polycarboxylate water reducing agent and preparing method thereof |
| US10196310B2 (en) * | 2016-08-04 | 2019-02-05 | Geopolymer Solutions LLC | Cold fusion concrete |
| CN109369076A (en) * | 2018-11-21 | 2019-02-22 | 杭州金鼎实业有限公司 | A kind of concrete and preparation method thereof |
| CN110003400A (en) * | 2019-04-03 | 2019-07-12 | 山西众诺和建材有限公司 | A kind of silane coupler modified polycarboxylate water-reducer and preparation method thereof |
-
2019
- 2019-12-06 CN CN201911243074.7A patent/CN110845199B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102079647A (en) * | 2010-11-30 | 2011-06-01 | 南京理工大学 | Basalt fiber reinforced cement matrix composite and preparation method thereof |
| CN104876468A (en) * | 2015-05-15 | 2015-09-02 | 武汉理工大学 | Functionalized polycarboxylic acid water reducer matched with silica fume and preparation method thereof |
| CN105384379A (en) * | 2015-12-10 | 2016-03-09 | 西安建筑科技大学 | White carbon black modified polycarboxylic acid water reducer and preparation method thereof |
| CN105622862A (en) * | 2015-12-28 | 2016-06-01 | 沈阳华盈环保材料有限公司 | Concrete polycarboxylate water reducing agent and preparing method thereof |
| US10196310B2 (en) * | 2016-08-04 | 2019-02-05 | Geopolymer Solutions LLC | Cold fusion concrete |
| CN109369076A (en) * | 2018-11-21 | 2019-02-22 | 杭州金鼎实业有限公司 | A kind of concrete and preparation method thereof |
| CN110003400A (en) * | 2019-04-03 | 2019-07-12 | 山西众诺和建材有限公司 | A kind of silane coupler modified polycarboxylate water-reducer and preparation method thereof |
Non-Patent Citations (4)
| Title |
|---|
| 何丽红等: "硅烷偶联剂KH-570对硅藻土表面疏水改性研究", 《现代化工》 * |
| 冉岚等: "硅烷偶联剂改性粉煤灰的制备及表征", 《化工新型材料》 * |
| 汪多仁: "《绿色纳米化学品》", 30 July 2007, 科学技术文献出版社 * |
| 罗文君等: "《稀土生产废水处理技术》", 30 December 2016, 中国地质大学出版社 * |
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