CN110963759A - Impervious concrete with high mud content aggregate - Google Patents
Impervious concrete with high mud content aggregate Download PDFInfo
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- CN110963759A CN110963759A CN201911217400.7A CN201911217400A CN110963759A CN 110963759 A CN110963759 A CN 110963759A CN 201911217400 A CN201911217400 A CN 201911217400A CN 110963759 A CN110963759 A CN 110963759A
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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
- 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
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/10—Coating or impregnating
- C04B20/1055—Coating or impregnating with inorganic materials
- C04B20/1077—Cements, e.g. waterglass
- C04B20/1085—Waterglass
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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
- C04B28/06—Aluminous 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
- 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
Abstract
The invention discloses impervious concrete with high mud content aggregate, which comprises 1900 parts of aggregate 1200-1900 parts, 180 parts of water 120-180 parts, and 2-10 parts of water reducing agent, and also comprises 20-36 parts of powder and pretreating agent, wherein the powder comprises the following components: cement 150-210 parts, fly ash 30-90 parts, mineral powder 30-110 parts and silica fume 0-40 parts; the pretreating agent comprises the following components in parts by weight (10-30): (30-60): (20-50): (2-10) the polyvinyl alcohol solution, the sodium sulfate solution, the sodium silicate solution and the fly ash; the preparation method of the impervious concrete with high mud content mainly comprises the following steps: s1, aggregate pretreatment: soaking aggregate in the pretreating agent for pretreatment, and filtering to remove liquid of the pretreating agent; s2, powder material mixing: and (4) adding a water reducing agent, powder and water into the aggregate filtered from the pretreatment agent liquid in the step S1, and uniformly stirring to obtain the finished concrete. The invention has the technical effects of improving the impermeability and the durability of concrete.
Description
Technical Field
The invention relates to the technical field of concrete preparation and production, in particular to impervious concrete with high mud content aggregate.
Background
There is a certain relation between the impermeability and the durability of concrete, because the permeability controls the rate of external water, gas molecules and harmful ions permeating the whole concrete structure, which is not only related to the water-proof and water-retaining effects of concrete, but also has an influence on the frost resistance, chemical resistance and carbonation resistance of concrete, so that the improvement of the impermeability of concrete plays a particularly important role in the improvement of the concrete performance.
Because the commercial mixing station has large concrete production amount and needs continuous production, in order to improve the production efficiency, the commercial mixing station is easy to have the phenomenon of poor quality supervision on the sandstone aggregate, so that some aggregates with low quality, such as machine-made sand with more mud content and stone powder content, and broken stones with more mud block content and needle sheet shape are used for production. The mud has smaller fineness, small hardness and poor adhesion, and the mud is coated on the surfaces of the grains of the sandstone aggregate, so that the grains of the sandstone aggregate are prevented from being bonded with cement, a large number of micro cracks and pores are formed among the grains of the sandstone aggregate, the micro cracks and the pores form a structural weak area, water and salt ions easily permeate into the concrete from the micro cracks and the pores, the strength, the impermeability, the carbonization resistance and the durability of the concrete are reduced, a series of adverse effects are brought to the performance of the concrete, and particularly, the adverse effects on the impermeability of low-strength-grade concrete with less consumption of cementing materials are particularly obvious.
In order to solve the problems, the Chinese patent with the patent publication number of CN104072045B provides a concrete with high mud content, which comprises the following raw materials: the cement-based flue gas desulfurization agent comprises cement, sand, broken stone, a waste calcined material, an additive and water, wherein the mud content of the sand is 0-10%, and the additive consists of a polycarboxylic acid water reducing agent, cellulose grafted chitosan, flue sediment, a silane coupling agent, polyvinylpyrrolidone and silicon carbide. According to the invention, the additive is added to reduce the agglomeration of soil and the wrapping of aggregate (aggregate particles), so that the cementing materials such as cement can be directly contacted and bonded with more aggregate particle surfaces, and the microcracks and pores among the aggregate particles are reduced, thereby achieving a better gluing effect and improving the performances such as the overall strength, durability and the like of the concrete aggregate.
However, due to the interface transition zone between the sand aggregate and the cement binder, the water-cement ratio in this zone is large, resulting in relatively coarse crystallized products near the surface of the aggregate particles and thus a structure with more microcracks and pores than in conventional cement-based phases or mortars. The high-mud content concrete in the patent does not overcome the problems of multiple microcracks and multiple pores in an interface transition layer between the sandstone aggregate and the cement cementing material, so that the durability of the concrete, such as impermeability and carbonization resistance, is reduced due to factors such as crystal microcracks and pores.
Disclosure of Invention
The invention aims to provide impervious concrete with high mud-containing aggregate, which improves the structure of an interface transition layer between aggregate particles and a cement cementing material, reduces crystal microcracks and porosity in the interface transition layer, and improves the impermeability and durability of the concrete.
The invention is realized by the following technical scheme:
the impervious concrete with high mud content comprises 1900 parts of aggregates, 180 parts of water and 2-10 parts of a water reducing agent, and also comprises 20-36 parts of powder and a pretreating agent, wherein the powder comprises the following components in parts by weight: cement 150-210 parts, fly ash 30-90 parts, mineral powder 30-110 parts and silica fume 0-40 parts; the pretreating agent comprises the following components in parts by weight (10-30): (30-60): (20-50): (2-10) the polyvinyl alcohol solution, the sodium sulfate solution, the sodium silicate solution and the fly ash; the preparation method of the impervious concrete with high mud content mainly comprises the following steps:
s1, aggregate pretreatment: soaking aggregate in the pretreating agent for pretreatment, and filtering to remove liquid of the pretreating agent;
s2, powder material mixing: and (4) adding a water reducing agent, powder and water into the aggregate filtered from the pretreatment agent liquid in the step S1, and uniformly stirring to obtain the finished concrete.
By adopting the technical scheme, the polyvinyl alcohol in the pretreating agent is a polyhydroxy compound, has good film forming property and bonding force, and the aggregate is pretreated by adopting the pretreating agent, so that the polyvinyl alcohol is attached to the surface of the aggregate particles to form a layer of film. The polyvinyl alcohol contains a large amount of hydrophilic hydroxyl groups, so that the water-cement ratio at the interface transition layer of the aggregate particles and the cement gel material can be effectively reduced, the crystal enrichment degree of the interface transition layer is reduced, the structure of the interface transition layer is improved, the size and the crystal orientation degree of crystal particles are reduced, the porosity at the interface transition layer is greatly reduced, the water absorption rate of the whole aggregate is reduced, and the crushing value and the apparent density of the whole aggregate are increased.
In addition, after the aggregate treated by the pretreating agent is mixed with water, powder and the water reducing agent, the pretreating agent attached to the surface of the aggregate particles is in the water atmosphere again, and the polyvinyl alcohol has a large number of hydrophilic hydroxyl groups, so that the dispersibility and the flowability between the aggregate and the powder can be improved, the water consumption required by concrete is reduced, and the water-cement ratio is reduced. When cement is hydrated to generate silicic acid gel, the polyvinyl alcohol on the surface of the aggregate particles can be glued with the silicic acid gel, so that the cementing material is fully filled in micro cracks and pores among the high-mud-content aggregate particles, the compressive strength of the concrete and the adhesive compactness and adhesive strength between the cement cementing material and the aggregate particles are improved, external moisture or salt ions are prevented from entering among the aggregate particles, and the durability of the concrete such as impermeability, carbonation resistance and the like is finally enhanced.
Further setting the following steps: the mass concentration of the polyvinyl alcohol solution is 10%, the mass concentration of the sodium sulfate solution is 10%, and the mass concentration of the sodium silicate solution is 5%.
By adopting the technical scheme, the polyvinyl alcohol solution with the mass concentration of 10%, the sodium sulfate with the mass concentration of 10% and the sodium silicate with the mass concentration of 5% are compounded, the polyvinyl alcohol is attached to the surface of the aggregate, and the sodium sulfate can promote the gelation of the polyvinyl alcohol aqueous solution, so that the polyvinyl alcohol is solidified on the surface of the aggregate particles to form a film stably; the sodium silicate can generate a cross-linking reaction with the polyvinyl alcohol, and the sodium silicate is matched with the fly ash in the pretreating agent, so that the bonding strength between the polyvinyl alcohol and the surface of the aggregate particles can be enhanced, a film coated on the surface of the aggregate particles is not easy to fall off, and the interface transition layer structure between the aggregate particles and the cementing material can be better improved.
Further setting the following steps: the aggregate comprises 800-1150 parts by weight of coarse aggregate and 400-750 parts by weight of fine aggregate, the coarse aggregate adopts crushed stone with the particle size of 5-25mm, and the fine aggregate adopts machine-made sand with the fineness modulus of 2.5-3.5.
By adopting the technical scheme, the aggregate is composed of coarse aggregate and fine aggregate, the broken stone with the grain diameter of 5-25mm and the machine-made sand with the fineness modulus of 2.5-3.5 form good grading action, on one hand, microcracks and pores of the aggregate can be reduced, on the other hand, the occlusion force between the aggregates can be improved, and the compactness of the concrete can be increased.
Further setting the following steps: the coarse aggregate contains 0.5-1.2% of mud, 0.2-0.8% of mud blocks and 5-15% of needle-shaped broken stones.
By adopting the technical scheme, the coarse aggregate has the mud content of 0.5-1.2%, the mud block content of 0.2-0.8% and the needle-shaped broken stone of 5-15%, the quality of the coarse aggregate can be reduced by the low-quality impurities, but the low-quality impurities basically do not influence the service performance of the aggregate due to the film-forming pretreatment of the pretreatment agent and the adhesive action between the silicic acid gel and the polyvinyl alcohol, and the use requirement of the concrete on the aggregate can be reduced, so that the material cost is reduced.
Further setting the following steps: the fine aggregate satisfies that MB value is more than 1.4 and less than 2.2, stone powder content is 3-8%, and mud content is 3-12%.
By adopting the technical scheme, the machine-made sand with the MB value of more than 1.4 and less than 2.2, the stone powder content of 3-8 percent and the mud content of 3-12 percent has proper stone powder content, thereby reducing the use requirement of the machine-made sand, saving the material cost and basically not causing adverse effect on the use performance of the machine-made sand.
Further setting the following steps: the cement comprises at least one of Portland cement, aluminate cement and sulphoaluminate cement.
By adopting the technical scheme, the portland cement, the aluminate cement and the sulphoaluminate cement are cement materials with excellent performance, low price and easy obtainment, and the cements have strong gelling and bonding capabilities, play a good gluing role in concrete, have lower hydration heat and are beneficial to improving the mechanical property of the concrete.
Further setting the following steps: the preparation method of the impervious concrete with high mud content aggregate further comprises a wetting step, wherein the wetting step is between the step S1 and the step S2 and specifically comprises the following steps: and (4) carrying out air drying treatment on the aggregate obtained in the step (S1) by filtering the pretreatment agent liquid, and then carrying out wetting treatment to obtain wet aggregate.
By adopting the technical scheme, in the wetting step, the aggregate soaked by the pretreating agent is air-dried, so that the hydrosolvent in the pretreating agent attached to the surface of the aggregate particle is air-dried, the solute molecule protective film is remained on the surface of the aggregate particle, the bonding strength of the polyvinyl alcohol film and the aggregate particle is improved, the film breakage rate when the aggregate is mixed with water and other powder materials is reduced, the structure improvement effect of the pretreating agent on the interface transition layer between the aggregate particle and a cementing material is enhanced, and the effects of improving the impermeability, the carbonization resistance and the durability of concrete are more remarkable. The aggregate is mixed and stirred uniformly with 10 percent of water before being mixed with the powder, so that the aggregate is wetted by a small amount of water, the workability of subsequent mixing of the aggregate and the powder is improved, the uniform mixing of the aggregate and the powder is facilitated, and various performances of the concrete are improved.
Further setting the following steps: in the step S1, the time t1 for soaking the aggregate by the pretreating agent is 12-48 h; in the wetting step, the air drying time t2 of the aggregate after filtering the pretreatment agent liquid is 2-5 d.
By adopting the technical scheme, the aggregate is soaked in the pretreating agent for 12-48h, so that the pretreating agent is fully attached to the surface of the aggregate to form a protective film structure, and the possibility of reaction, gelation and solidification of polyvinyl alcohol and sodium sulfate caused by overlong time for soaking the aggregate in the pretreating agent and slowing down the air drying speed of a water solvent in the subsequent pretreating agent can also be reduced; after the aggregate is soaked, the aggregate is dried for 2-5 days in the air, so that a polyvinyl alcohol film in the pretreating agent is stably coated on the surfaces of aggregate particles, the aggregate pretreatment period is short, and the production efficiency of concrete is improved.
Further setting the following steps: in the wetting step, the aggregate subjected to air drying treatment is stirred with 10% of water until the aggregate is completely wetted, and the stirring time t3 is 60-120 s; in the step S2, adding the powder, the water reducing agent and the residual 90% of water into the wet aggregate obtained in the wetting step, and uniformly stirring for 60-120S at t 4.
By adopting the technical scheme, t3 is controlled to be between 60 and 120 seconds, so that the pretreated aggregate can be wetted before being mixed with the powder, the workability between the subsequent pretreated aggregate and the powder is improved, the possibility that the polyvinyl alcohol film on the surface of the aggregate particles is damaged due to the overlong contact time of the aggregate and water is reduced, the protection effect of the polyvinyl alcohol film is enhanced, and the impermeability strength and the durability of concrete are finally improved. t4 is controlled to be between 60 and 120 seconds, so that the aggregate, the powder and the residual 90 percent of water can be stirred to be in a uniform state, namely the concrete mixture has better service performance, the service performance is reduced due to nonuniform stirring within too short time, and the production efficiency is reduced due to too long time.
In conclusion, the beneficial technical effects of the invention are as follows:
(1) adding a pretreating agent into the formula, wherein after the pretreating agent is used for soaking and pretreating the aggregate, polyvinyl alcohol in the pretreating agent is attached to the surface of the aggregate to form a layer of film, so that the interface transition layer structure between aggregate particles and a cementing material is improved, and the porosity at the interface transition layer is reduced; meanwhile, the polyvinyl alcohol can improve the dispersibility and the flowability between aggregate and powder, reduce the water-cement ratio, and the polyvinyl alcohol is glued with a cementing material and filled in micro cracks and pores among aggregate particles, so that the compactness of concrete is improved, external water or salt ions are prevented from permeating among the aggregate particles, and the durability of the concrete, such as compressive strength, impermeability, carbonation resistance and the like, is finally enhanced; (ii) a
(2) The aggregate is composed of coarse aggregate and fine aggregate, and broken stone with the particle size of 5-25mm and machine-made sand with the fineness modulus of 2.5-3.5 form good grading action, so that on one hand, microcracks and pores of the aggregate can be reduced, on the other hand, the occlusion force between the aggregates can be improved, and the compactness of the concrete is increased;
(3) when the concrete is prepared, firstly, the aggregate is soaked in the pretreating agent, so that the polyvinyl alcohol in the pretreating agent forms a protective film structure on the surface of the aggregate, then, the aggregate is air-dried, so that the hydrosolvent attached to the surface of the aggregate is air-dried, the solute polyvinyl alcohol molecules stay on the surface of the aggregate, and the bonding strength between the polyvinyl alcohol film and the aggregate is improved; then 10% of water of the aggregate is mixed and stirred uniformly to ensure that the aggregate is fully wetted, and finally the mixture is mixed with other powder and mixing water, so that the workability of subsequent mixing of the aggregate and the powder is improved, the uniform mixing of the aggregate and the powder is facilitated, and various performances of the concrete are improved.
Detailed Description
The impervious concrete with high content of mud aggregate of the embodiment mode of the invention comprises the components with the weight parts shown in the table 1 (1 weight part is 1 kg);
wherein the pretreating agent is composed of polyvinyl alcohol solution, sodium sulfate solution, sodium silicate solution and fly ash by weight ratio shown in Table 2. The mass concentration of the polyvinyl alcohol solution is 10%, the mass concentration of the sodium sulfate solution is 10%, and the mass concentration of the sodium silicate solution is 5%.
The mineral powder is blast furnace slag powder.
The silica fume is silica fume.
The water reducing agent is polycarboxylic acid water reducing agent.
The aggregate is composed of coarse aggregate and fine aggregate, the coarse aggregate is broken stone, the fine aggregate is machine-made sand, and the parameters of the coarse aggregate and the fine aggregate are shown in table 3.
Table 1 component content table for examples 1-8 (1 weight part ═ 1kg)
TABLE 2 weight ratios of the components in the pretreatment of examples 1-8
TABLE 3 table of parameters for coarse and fine aggregates of examples 1-8
The preparation method of the impervious concrete with high mud content aggregate provided by the embodiment of the invention comprises the following steps:
s1, aggregate pretreatment: firstly, soaking aggregate by using a pretreating agent for soaking pretreatment, wherein the time t1 for soaking the aggregate by using the pretreating agent is 12-48h, and then filtering out liquid of the pretreating agent;
a wetting step: carrying out air drying treatment on the aggregate obtained in the step S1 after the pretreatment agent liquid is filtered out, wherein the air drying time t2 is 2-5 d; and then carrying out wetting treatment, namely stirring the air-dried aggregate with 10% of water until the aggregate is completely wetted, wherein the stirring time t3 is 60-120s, and the stirring speed is 80 r/min, so as to obtain the wet aggregate.
S2, powder material mixing: and adding the powder, the water reducing agent and the residual 90% of water into the wet aggregate obtained in the wetting step, uniformly stirring to obtain the finished concrete, wherein the stirring time t4 is 60-120s, and the stirring speed is 80 r/min.
In the preparation method of the impervious concrete with high mud content aggregate according to the embodiment of the invention, the process parameters t1, t2, t3 and t4 in each example are shown in table 4.
Table 4 table of process parameters for examples 1-8
Comparative example 1: the comparative example differs from example 1 in that the formulation does not contain a pretreating agent, and the aggregate is directly mixed with the powder, the water reducing agent and all the water to obtain the finished concrete without being subjected to the soaking pretreatment in the step S1.
Comparative example 2: the comparative example is different from example 1 in that the aggregate, the powder, the water reducing agent and the pretreating agent in the formula are all mixed and stirred uniformly at one time, and the stirring time is the sum of t3 and t4 in example 1.
Comparative example 3: this comparative example differs from example 1 in that the pretreatment agents were all sodium sulfate solutions having a mass concentration of 10%.
Comparative example 1: the comparative example differs from example 1 in that the pretreating agent was composed of a sodium sulfate solution and fly ash in a weight ratio of 10:2, and the mass concentration of the sodium sulfate solution was 10%.
Comparative example 5: the comparative example is different from example 1 in that the weight ratio of the components in the pretreatment agent is polyvinyl alcohol solution: sodium sulfate solution: sodium silicate solution: pretreated fly ash 5:38:55:28: 4.
Comparative example 6: the comparative example is different from example 1 in that the weight ratio of the components in the pretreatment agent is polyvinyl alcohol solution: sodium sulfate solution: sodium silicate solution: pretreated fly ash 35:45:18: 7.
And (3) performance testing:
the concrete samples obtained in examples 1 to 8 and comparative examples 1 to 6 were subjected to a water permeation resistance test, a carbonization test and an anti-freeze test in accordance with "Standard test methods for Long-term Performance and durability of ordinary concrete" GB/T50082-2009. The anti-freezing test represents the anti-freezing property of the concrete test piece by measuring the freeze-thaw compressive strength of the concrete test piece after standard curing for 28d after the freeze-thaw test, and records the compressive strength of the test piece after standard curing for 28d before the freeze-thaw test as the initial compressive strength. The test results of the respective items are shown in tables 5, 6 and 7, respectively.
TABLE 5 Water penetration resistance test data sheet
TABLE 6 carbonization test data sheet
TABLE 7 compressive strength data sheet for freeze-thaw test
Analysis of test data: as is apparent from tables 5, 6 and 7, when the data of the impermeability, the carbonation test and the compressive strength test of the freeze-thaw test of the impermeable concrete 28d of examples 1 to 8 are compared with those of comparative examples 1 to 6 as a whole, it can be found that examples 1 to 8 are superior to comparative examples 1 to 6 in the impermeability, the freezing resistance and the compressive resistance.
When compared one by one, the permeability resistance grade P8 of the comparative example 1 is smaller than that P12 of the example compared with the example 1 of the comparative example 1; the carbonization depths of the example 1 at the time points of 28d, two months and three months are respectively less than the carbonization depths corresponding to the comparative example 1; the freeze-thaw compressive strength of example 1 is greater than that of comparative example 1. The lack of the pretreatment agent and the corresponding step of S1 of soaking the pretreated aggregate by the pretreatment agent can cause the great reduction of the impermeability, the carbonization resistance and the frost resistance of the concrete, that is, the pretreatment agent is used for soaking the aggregate, so that the number of micro cracks and pores in the concrete can be reduced, the compactness of the concrete can be improved, and the durability of the concrete, such as the impermeability, the carbonization resistance and the frost resistance, can be finally enhanced.
Comparative example 2 shows a decrease in the impermeability, the resistance to carbonization, and the freezing resistance as compared to example 1, but the impermeability, the resistance to carbonization, and the freezing resistance of comparative example 2 are relatively better as compared to comparative example 1, which shows that the step S1 of the immersion pretreatment of the aggregate can improve the concrete performance better with the addition of the pretreatment agent.
Comparative example 3 compared with example 1, the impermeability, the carbonation resistance and the freezing resistance of comparative example 1 are greatly reduced, which shows that the polyvinyl alcohol, the sodium silicate and the pretreated fly ash in the pretreatment agent are key components for promoting the durability of the concrete.
Comparative example 4 compared with example 1 and comparative example 3, the impermeability, the resistance to carbonation and the freezing resistance of comparative example 4 were all greatly reduced compared to example 1, while the permeability, the resistance to carbonation and the freezing resistance of comparative example 4 were slightly better than comparative example 3, indicating that the components of the pretreatment agent that play a major role in the durability of concrete were polyvinyl alcohol and sodium silicate, while the pretreated fly ash played a promoting role on the basis of polyvinyl alcohol and sodium silicate.
Comparative examples 5 and 6 were compared with example 1, and comparative examples 5 and 6 were significantly reduced in the penetration resistance, the carbonization resistance and the freezing resistance as compared with example 1, but were superior to comparative examples 3 and 4 as a whole, indicating that the composition of each component in the pretreatment agent had a greater influence on the durability of concrete and that the effect was better when four components were present at the same time.
The implementation principle and the beneficial effects of the embodiment are as follows: adding a pretreating agent into the formula, and soaking the aggregate by using the pretreating agent before mixing the aggregate with the powder to ensure that polyvinyl alcohol in the pretreating agent is attached to the surface of the aggregate to form a layer of film, wherein the film can effectively reduce the water-cement ratio at the interface transition layer of aggregate particles and a cement gel material when the aggregate is mixed with the powder, water and a water reducing agent, so that the crystal enrichment degree of the interface transition layer is reduced, the structure of the interface transition layer is improved, the size of crystal particles and the crystal orientation degree are reduced, and the porosity at the interface transition layer is greatly reduced; in addition, the polyvinyl alcohol film on the surface of the aggregate particles can be glued with silicic acid gel formed by hydration reaction, so that the cementing material is fully filled in micro cracks and pores among the high-mud-content aggregate particles, the compressive strength of concrete and the adhesive compactness and adhesive strength between the cement cementing material and the aggregate particles are improved, external moisture or salt ions are prevented from entering among the aggregate particles, and the durability of the concrete such as impermeability and carbonation resistance is finally enhanced.
The embodiments of the present invention are preferred embodiments of the present invention, and the scope of the present invention is not limited by these embodiments, so: all equivalent changes made according to the structure, shape and principle of the invention are covered by the protection scope of the invention.
Claims (9)
1. The impervious concrete with high mud content comprises 1900 parts of aggregate 1200-1900 parts, 180 parts of water 120-180 parts and 2-10 parts of water reducing agent, and is characterized by further comprising 20-36 parts of powder and pretreatment agent, wherein the powder comprises the following components: cement 150-210 parts, fly ash 30-90 parts, mineral powder 30-110 parts and silica fume 0-40 parts; the pretreating agent comprises the following components in parts by weight (10-30): (30-60): (20-50): (2-10) the polyvinyl alcohol solution, the sodium sulfate solution, the sodium silicate solution and the fly ash;
the preparation method of the impervious concrete with high mud content mainly comprises the following steps:
s1, aggregate pretreatment: soaking aggregate in the pretreating agent for pretreatment, and filtering to remove liquid of the pretreating agent;
s2, powder material mixing: and (4) adding a water reducing agent, powder and water into the aggregate filtered from the pretreatment agent liquid in the step S1, and uniformly stirring to obtain the finished concrete.
2. The mud-rich aggregate impervious concrete of claim 1, wherein: the mass concentration of the polyvinyl alcohol solution is 10%, the mass concentration of the sodium sulfate solution is 10%, and the mass concentration of the sodium silicate solution is 5%.
3. The mud-rich aggregate impervious concrete of claim 1, wherein: the aggregate comprises 800-1150 parts by weight of coarse aggregate and 400-750 parts by weight of fine aggregate, the coarse aggregate adopts crushed stone with the particle size of 5-25mm, and the fine aggregate adopts machine-made sand with the fineness modulus of 2.5-3.5.
4. The mud-rich aggregate impervious concrete of claim 3, wherein: the coarse aggregate contains 0.5-1.2% of mud, 0.2-0.8% of mud blocks and 5-15% of needle-shaped broken stones.
5. The impervious concrete with high content of mud aggregate of claim 4, wherein: the fine aggregate satisfies that MB value is more than 1.4 and less than 2.2, stone powder content is 3-8%, and mud content is 3-12%.
6. The mud-rich aggregate impervious concrete of claim 5, wherein: the cement comprises at least one of Portland cement, aluminate cement and sulphoaluminate cement.
7. The impervious concrete with high mud content as claimed in claim 1, wherein the preparation method of the impervious concrete with high mud content further comprises a wetting step, the wetting step is between the step of S1 and the step of S2, and is specifically as follows: and (4) carrying out air drying treatment on the aggregate obtained in the step (S1) by filtering the pretreatment agent liquid, and then carrying out wetting treatment to obtain wet aggregate.
8. The mud-rich aggregate impervious concrete of claim 7, wherein: in the step S1, the time t1 for soaking the aggregate by the pretreating agent is 12-48 h; in the wetting step, the air drying time t2 of the aggregate after filtering the pretreatment agent liquid is 2-5 d.
9. The impervious concrete with high content of mud aggregate according to claim 7 or 8, characterized in that: in the wetting step, the aggregate subjected to air drying treatment is stirred with 10% of water until the aggregate is completely wetted, the stirring time t3 is 60-120s, and the stirring speed is 80 r/min; in the step S2, adding the powder, the water reducing agent and the residual 90% of water into the wet aggregate obtained in the wetting step, and uniformly stirring, wherein the stirring time t4 is 60-120S, and the stirring speed is 80 r/min.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112142363A (en) * | 2020-10-10 | 2020-12-29 | 杭州瑞鼎建材有限公司 | Automatic shrinkage compensation efflorescence resistant concrete |
| CN112441768A (en) * | 2020-11-26 | 2021-03-05 | 江苏超力建材科技有限公司 | Water-washing sandstone treatment agent and method for preparing concrete |
| CN114606957A (en) * | 2022-03-05 | 2022-06-10 | 山东鲁道建设工程有限公司 | Railway slope prefabricated assembled post-cast framework slope protection structure and construction method thereof |
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| CN106946512A (en) * | 2017-03-27 | 2017-07-14 | 浙江大学 | A kind of preparation method of high water-tight concrete |
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| CN112142363A (en) * | 2020-10-10 | 2020-12-29 | 杭州瑞鼎建材有限公司 | Automatic shrinkage compensation efflorescence resistant concrete |
| CN112142363B (en) * | 2020-10-10 | 2021-12-28 | 杭州瑞鼎建材有限公司 | Automatic shrinkage compensation efflorescence resistant concrete |
| CN112441768A (en) * | 2020-11-26 | 2021-03-05 | 江苏超力建材科技有限公司 | Water-washing sandstone treatment agent and method for preparing concrete |
| CN114606957A (en) * | 2022-03-05 | 2022-06-10 | 山东鲁道建设工程有限公司 | Railway slope prefabricated assembled post-cast framework slope protection structure and construction method thereof |
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