CN108706909B - Special modifier for pervious concrete and preparation method thereof - Google Patents
Special modifier for pervious concrete and preparation method thereof Download PDFInfo
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- CN108706909B CN108706909B CN201810597824.XA CN201810597824A CN108706909B CN 108706909 B CN108706909 B CN 108706909B CN 201810597824 A CN201810597824 A CN 201810597824A CN 108706909 B CN108706909 B CN 108706909B
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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
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
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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
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/27—Water resistance, i.e. waterproof or water-repellent materials
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Abstract
The invention discloses a special modifier for pervious concrete, which is characterized by comprising the following components in percentage by mass: 10-15% of long carbon chain silane and 45-60% of dispersing agent; 5 to 10 percent of polysiloxane resin; 5 to 10 percent of fluorocarbon resin emulsion; 10% -20% of deionized water; the mass percentage of the components is 100 percent. The modifier special for the pervious concrete is doped into the pervious concrete, water molecules can be forced to diffuse into the concrete under the hydrophobic action of the modifier, the hydration of cement is facilitated, a compact hydrophobic film can be formed on the surface of the concrete and the inner wall of a pore structure after the modifier is formed, the evaporation of water in the concrete can be effectively prevented, the later-stage full hydration of the concrete is ensured, and the strength of the concrete is improved.
Description
Technical Field
The invention relates to the technical field of concrete, in particular to a special modifier for pervious concrete and a preparation method thereof.
Background
At present, the construction of sponge cities is carried out in a fierce manner, and 16 cities in China obtain the qualification of sponge city test points. As the ecological and environment-friendly pavement material, the pervious concrete has a continuous pore structure inside, and the cavities are uniformly distributed in a honeycomb shape, compared with the traditional pavement material, the pervious concrete has better water and air permeability, is more favorable for sound absorption and noise reduction, surface temperature adjustment, water purification, underground water resource protection, urban thermal environment improvement and soil ecological environment improvement, and completely meets the concept of sponge city construction in China and the requirement of city development in the current era.
However, the research and application of pervious concrete in China are still in the beginning stage, and the contradiction between the water permeability and the strength of the pervious concrete is still difficult to solve, and generally, the better the water permeability is, the lower the strength is; the higher the strength, the worse the water permeability. The reason is that: the strength is increased, and the use amount of a cementing material is required to be increased or the pores among aggregates are required to be reduced, so that the porosity of the pervious concrete is reduced, and the water permeability is poor. Therefore, if some special additives are introduced into the pervious concrete, the strength and the water permeability of the pervious concrete are improved, and even the durability of the pervious concrete is improved, the defects of the pervious concrete can be further overcome, and the application and the development of the pervious concrete are greatly promoted.
Patent CN 106746800 a discloses a cementitious material and pervious concrete containing the cementitious material. The cementing material comprises the following raw materials in parts by weight: 60-90 parts of high-strength low-calcium low-heat silicate cement, 0.1-15 parts of latex powder, 0.1-8 parts of micro silica powder, 0.1-5 parts of nano silicon dioxide, 5-28 parts of mineral active admixture and 5-25 parts of sulphoaluminate cement. The pervious concrete prepared from the cementing material not only meets the requirement on water permeability, but also can meet the requirement on C40 concrete in 28d strength and C50 in 90d strength, can be used for driving pavements, and has excellent high bearing capacity.
Patent CN 106746884A discloses a pervious concrete reinforcing agent and a preparation method thereof. The permeable concrete reinforcing agent is prepared from components including silicon dioxide, sodium sulfate, wood sulfonate, hydroxypropyl methyl cellulose, wood fiber and the like, and the component ratio of each component is as follows: 80-90 parts of silicon dioxide, 1-4 parts of sodium sulfate, 6-9 parts of wood sulfonate, 1-3 parts of hydroxypropyl methyl cellulose and 0.1-1 part of wood fiber. This technical scheme can have better compressive strength simultaneously under the prerequisite that guarantees that the concrete has better water permeability. After the reinforcing agent is used, the compressive strength of the pervious concrete can reach the C30 strength index.
Patent CN 107382125A discloses a pervious concrete reinforcing agent and a preparation method thereof. The permeable concrete reinforcing agent comprises the following components in percentage by mass: 25-35% of redispersible rubber powder; 35-45% of polyurethane emulsion; 0.5-2% of a thickening agent; 1-2.5% of a defoaming agent; 10-15% of a water reducing agent; 1-2% of retarder; 10-15% of water; the mass percentage of the components is 100 percent. The reinforcing agent has good cohesiveness and tensile property, can obviously improve the tensile strength of pervious concrete and improve the comprehensive performance of the pervious concrete.
The above patents are based on the strength of the pervious concrete, and through the development of high-strength cementing materials or concrete reinforcing agents, on the premise of ensuring that the water permeability meets the requirements, the strength of the pervious concrete is improved to the maximum, the purpose of improving the strength and the water permeability of the pervious concrete at the same time is not achieved, and the problem of durability of the pervious concrete is not considered. The durability is the ability of concrete to resist various destructive factors under actual use conditions, the strength and appearance integrity can be maintained for a long time, and the poor durability can cause the concrete structure to be easily destroyed under various environmental conditions (light, heat, oxygen, water, acid, alkali, salt and the like), so that the structural stability and safety can be greatly reduced, and the service life can be greatly reduced. Therefore, aiming at the defects of the prior art, the development of a special modifier capable of comprehensively improving the strength, the water permeability and the durability of the pervious concrete is of great significance.
Disclosure of Invention
The invention aims to solve the defects of the background technology and provide a special modifier for pervious concrete, which can comprehensively improve the strength, the water permeability and the durability of the pervious concrete.
The technical scheme of the invention is as follows: the special modifier for the pervious concrete is characterized by comprising the following components in percentage by mass:
10-15% of long carbon chain silane;
45 to 60 percent of dispersant;
5 to 10 percent of polysiloxane resin;
5 to 10 percent of fluorocarbon resin emulsion;
10% -20% of deionized water;
the mass percentage of the components is 100 percent;
the long carbon chain silane is one or a mixture of isobutyl triethoxysilane, isooctyl triethoxysilane, perfluorooctyl triethoxysilane (also known as 1H,1H,2H, 2H-perfluorooctyl triethoxysilane), n-octyltrimethoxysilane, dodecyl trimethoxysilane and hexadecyl trimethoxysilane.
The special modifier has a hydrophobic effect, can force water molecules to diffuse into the concrete, is more favorable for cement hydration, can form a compact hydrophobic film on the surface of the concrete and the inner walls of pore structures such as intercommunicating pores, semi-open pores, closed pores and the like after being formed, can effectively prevent water in the concrete from evaporating, ensures the later-stage full hydration of the concrete, and is favorable for improving the strength of the concrete. Meanwhile, the pervious concrete is in a hydrophobic state from the inner surface to the outer surface due to the existence of the hydrophobic membrane, so that the surface tension of the pervious concrete is greatly reduced, the surface contact angle with water is increased, the contact surface is similar to lotus leaves, the water permeability of the pervious concrete can be obviously improved, the wetting and the soaking of rainwater can be effectively prevented, and the durability of the pervious concrete is greatly improved.
The long carbon chain silane in the special modifier is a small molecular substance, easily enters deep inside the concrete, but stays on the surface of the concrete to form a film with limited capability, and the polysiloxane resin has a molecular weight of up to ten thousand, easily forms a compact hydrophobic film on the surface of the concrete, but cannot enter an inner gap due to high viscosity. When the long-carbon-chain silane and the polysiloxane resin are used simultaneously, the small-molecular long-carbon-chain silane enters gaps among the long polysiloxane chains, so that the acting force among the high-molecular chains is weakened, the viscosity of the polysiloxane resin is effectively reduced, and the penetration depth of the polysiloxane resin in concrete can be improved; the long carbon chain silane has the main component of silanol (Si-OH) hydrolysate, can participate in cement hydration together with polysiloxane resin, is anchored on the inner surface and the outer surface of concrete to form a compact hydrophobic film, and improves the strength, the water permeability and the durability of the concrete. Meanwhile, C-F of the fluorocarbon resin emulsion in the special modifier component for pervious concrete is a strong hydrophobic bond, so that the surface waterproofness can be further improved after film formation, and the C-F bond is extremely firm, so that the stability of the whole product can be greatly improved under the synergistic action of the fluorocarbon resin emulsion, long-carbon-chain silane and polysiloxane resin, and compared with the polysiloxane resin, the fluorocarbon resin emulsion has better weather resistance and can further improve the durability of concrete.
Preferably, the dispersant is one of absolute ethyl alcohol, isopropanol and acetone. The dispersing agent uniformly disperses the long carbon chain silane, the polysiloxane resin and the fluorocarbon resin in a system to carry out efficient modification on the concrete.
Preferably, the polysiloxane resin is methyl polysiloxane resin with the solid content of more than or equal to 98 percent, the molecular weight of the polymethyl siloxane resin is 10000-20000, and the viscosity is 1000 cP-5000 cP. The pH value of the polysiloxane resin is 6-7, according to the existing process means, the solid content of the methyl polysiloxane resin is necessarily less than 100%, and the molecular weight is 10000-20000 index average molecular weight.
Preferably, the fluorocarbon resin emulsion is aqueous fluorocarbon resin emulsion with solid content of 50-60%, viscosity of 20-40 mPa.s and particle size of 0.12-0.22 μm, and the mass percentage of fluorine contained in the fluorocarbon resin emulsion is 11.5-28.0%. The pH value of the fluorocarbon resin emulsion is 8-10, and the glass transition temperature of the fluorocarbon resin is 24-28 ℃.
Preferably, the special modifier for pervious concrete comprises the following components in percentage by mass:
12 to 15 percent of long carbon chain silane;
45 to 50 percent of dispersant;
8 to 10 percent of polysiloxane resin;
8 to 10 percent of fluorocarbon resin emulsion;
15% -20% of deionized water;
the mass percentage of the components is 100 percent. The percentage content of each component in the scheme is further optimized, so that the 7d strength of the pervious concrete reaches 23.8-24.3 MPa, the 28d strength reaches 30.8-31.4 MPa, and the water permeability coefficient reaches 5.5-6.2 mm.s-1The corrosion resistance coefficient reaches 0.93-0.95.
Preferably, the long carbon chain silane is obtained by mixing isobutyl triethoxysilane and dodecyl trimethoxysilane according to the mass ratio of 1: 1. Isobutyl steric hindrance in the isobutyl triethoxysilane is large, and molecular rigidity is large; the dodecyl trimethoxy silane contains a flexible long chain with 12 carbon atoms, and the combination of the dodecyl trimethoxy silane and the flexible long chain can synergistically increase the bonding force with concrete and the weather resistance.
The invention also provides a preparation method of the special modifier for the pervious concrete, which is characterized by comprising the following steps:
a. mixing and stirring a dispersing agent, deionized water with the total mass of 0.1-0.2 times of that of the deionized water and long carbon chain silane to form a hydrophobic agent;
b. adding the rest water into production equipment, adding a hydrophobing agent under the condition that the rotating speed is 240r/min, and stirring for 10-15 min;
c. adding polysiloxane resin, and stirring for 10-15 min;
d. adding fluorocarbon resin emulsion, and stirring until the fluorocarbon resin emulsion is uniformly dispersed to obtain the special modifier for the pervious concrete.
Preferably, step a is: at the temperature of 10-40 ℃, sequentially adding a dispersing agent and deionized water with the total mass of 0.1-0.2 times of that of the deionized water into a reaction kettle, stirring for 5-10 min at the rotating speed of 60-120 r/min, and adjusting the pH value to 2-3 to obtain a solution A; and adding long-carbon-chain silane into the solution A, stirring at the rotating speed of 180-240 r/min, and carrying out heat preservation reaction for 20-40 min to obtain the hydrophobing agent.
The invention has the beneficial effects that:
1. the special modifier for the pervious concrete is doped into the pervious concrete, the hydrophobic effect of the special modifier can force water molecules to diffuse towards the interior of the concrete, so that cement hydration is facilitated, a compact hydrophobic film can be formed on the surface of the concrete and on the inner wall of a pore structure after molding, the evaporation of water in the concrete can be effectively prevented, the later-stage full hydration of the concrete is ensured, and the strength of the concrete is improved.
2. The hydrophobic membrane enables the pervious concrete to be in a hydrophobic state from the inner surface to the outer surface, so that the surface tension of the pervious concrete is greatly reduced, the water permeability of the pervious concrete can be obviously improved, the wetting and the soaking of rainwater can be effectively prevented, and the durability of the pervious concrete is greatly improved.
3. The preparation method is simple, the conditions are easy to control, and the operability is high.
Detailed Description
The following specific examples further illustrate the invention in detail.
The polysiloxane resin used in the following examples is methyl polysiloxane resin with a solid content of more than or equal to 98%, the viscosity is 1000 cP-5000 cP, the pH value is 6-7, and the molecular weight of the polymethyl siloxane resin is 10000-20000. The fluorocarbon resin emulsion is water-based fluorocarbon resin emulsion with the solid content of 50-60%, the viscosity of the emulsion is 20-40 mPa & s, the pH value is 8-10, the particle size of the emulsion is 0.12-0.22 mu m, the mass percentage content of fluorine in the fluorocarbon resin is 11.5-28.0%, and the glass transition temperature is 24-28 ℃. The mass percentages of the components of examples 1-8 are shown in the table below.
TABLE 1 quality percents of the components in examples 1-8
Example 1
The special modifier for pervious concrete in the embodiment comprises the following components in percentage by mass:
10% of long carbon chain silane, 58% of a dispersing agent, 7% of polysiloxane resin, 7% of fluorocarbon resin emulsion and 18% of deionized water, wherein the long carbon chain silane is isobutyl triethoxysilane, and the dispersing agent is ethanol.
The preparation method of the special modifier for the pervious concrete comprises the following steps:
a. sequentially adding a dispersing agent (ethanol) and deionized water with the total mass of 0.1 time of that of the deionized water into a reaction kettle at the temperature of 10-40 ℃, stirring for 10min at the rotating speed of 120r/min, and adjusting the pH value to 2-3 to obtain a solution A; adding long carbon chain silane (isobutyl triethoxy silane) into the solution A, stirring at the rotating speed of 240r/min, and carrying out heat preservation reaction for 40min to obtain the hydrophobing agent.
b. Adding the rest water into production equipment, adding a hydrophobing agent under the condition that the rotating speed is 240r/min, and stirring for 10 min;
c. adding polysiloxane resin, and stirring for 10 min;
d. adding fluorocarbon resin emulsion, and stirring until the fluorocarbon resin emulsion is uniformly dispersed to obtain the special modifier G1 for the pervious concrete.
Example 2
The special modifier for pervious concrete in the embodiment comprises the following components in percentage by mass:
11% of long carbon chain silane, 60% of a dispersing agent, 5% of polysiloxane resin, 5% of fluorocarbon resin emulsion and 19% of deionized water, wherein the long carbon chain silane is isooctyltriethoxysilane, and the dispersing agent is isopropanol.
The preparation method of the special modifier for the pervious concrete comprises the following steps:
a. sequentially adding a dispersing agent (isopropanol) and deionized water with the total mass of 0.15 time of that of the deionized water into a reaction kettle at the temperature of 10-40 ℃, stirring for 10min at the rotating speed of 120r/min, and adjusting the pH value to 2-3 to obtain a solution A; adding long carbon chain silane (isooctyltriethoxysilane) into the solution A, stirring at the rotating speed of 240r/min, and carrying out heat preservation reaction for 40min to obtain the hydrophobing agent.
b. Adding the rest water into production equipment, adding a hydrophobing agent under the condition that the rotating speed is 240r/min, and stirring for 15 min;
c. adding polysiloxane resin, and stirring for 15 min;
d. adding fluorocarbon resin emulsion, and stirring until the fluorocarbon resin emulsion is uniformly dispersed to obtain the special modifier G2 for the pervious concrete.
Example 3
The special modifier for pervious concrete in the embodiment comprises the following components in percentage by mass:
12% of long carbon chain silane, 54% of a dispersing agent, 10% of polysiloxane resin, 10% of fluorocarbon resin emulsion and 14% of deionized water, wherein the long carbon chain silane is isobutyl triethoxysilane, and the dispersing agent is acetone.
The preparation method of the special modifier for the pervious concrete comprises the following steps:
a. sequentially adding a dispersing agent (acetone) and deionized water with the total mass of 0.2 time of that of the deionized water into a reaction kettle at the temperature of 10-40 ℃, stirring for 8min at the rotating speed of 100r/min, and adjusting the pH value to 2-3 to obtain a solution A; adding long carbon chain silane (isobutyl triethoxy silane) into the solution A, stirring at the rotating speed of 200r/min, and carrying out heat preservation reaction for 30min to obtain the hydrophobing agent.
b. Adding the rest water into production equipment, adding a hydrophobing agent under the condition that the rotating speed is 240r/min, and stirring for 12 min;
c. adding polysiloxane resin, and stirring for 12 min;
d. adding fluorocarbon resin emulsion, and stirring until the fluorocarbon resin emulsion is uniformly dispersed to obtain the special modifier G3 for the pervious concrete.
Example 4
The special modifier for pervious concrete in the embodiment comprises the following components in percentage by mass:
14% of long carbon chain silane, 55% of a dispersing agent, 8% of polysiloxane resin, 8% of fluorocarbon resin emulsion and 15% of deionized water, wherein the long carbon chain silane is perfluorooctyl triethoxysilane, and the dispersing agent is isopropanol.
The preparation method of the special modifier for the pervious concrete comprises the following steps:
a. sequentially adding a dispersing agent (isopropanol) and deionized water with the total mass of 0.15 time of that of the deionized water into a reaction kettle at the temperature of 10-40 ℃, stirring for 5min at the rotating speed of 60r/min, and adjusting the pH value to 2-3 to obtain a solution A; adding long carbon chain silane (perfluorooctyl triethoxysilane) into the solution A, stirring at the rotation speed of 180r/min, and reacting for 20min under heat preservation to obtain the hydrophobing agent.
b. Adding the rest water into production equipment, adding a hydrophobing agent under the condition that the rotating speed is 240r/min, and stirring for 10 min;
c. adding polysiloxane resin, and stirring for 10 min;
d. adding fluorocarbon resin emulsion, and stirring until the fluorocarbon resin emulsion is uniformly dispersed to obtain the special modifier G4 for the pervious concrete.
Example 5
The special modifier for pervious concrete in the embodiment comprises the following components in percentage by mass:
15% of long carbon chain silane, 50% of dispersing agent, 10% of polysiloxane resin, 10% of fluorocarbon resin emulsion and 15% of deionized water, wherein the long carbon chain silane is n-octyl trimethoxy silane, and the dispersing agent is ethanol.
The preparation method of the special modifier for the pervious concrete comprises the following steps:
a. sequentially adding a dispersing agent (ethanol) and deionized water with the total mass of 0.2 time of that of the deionized water into a reaction kettle at the temperature of 10-40 ℃, stirring for 10min at the rotating speed of 120r/min, and adjusting the pH value to 2-3 to obtain a solution A; adding long carbon chain silane (n-octyl trimethoxy silane) into the solution A, stirring at the rotating speed of 240r/min, and carrying out heat preservation reaction for 40min to obtain the hydrophobing agent.
b. Adding the rest water into production equipment, adding a hydrophobing agent under the condition that the rotating speed is 240r/min, and stirring for 15 min;
c. adding polysiloxane resin, and stirring for 15 min;
d. adding fluorocarbon resin emulsion, and stirring until the fluorocarbon resin emulsion is uniformly dispersed to obtain the special modifier G5 for the pervious concrete.
Example 6
The special modifier for pervious concrete in the embodiment comprises the following components in percentage by mass:
15% of long carbon chain silane, 55% of a dispersing agent, 9.5% of polysiloxane resin, 8.5% of fluorocarbon resin emulsion and 12% of deionized water, wherein the long carbon chain silane is obtained by mixing isobutyl triethoxysilane and dodecyl trimethoxy silane according to the mass ratio of 1:1, and the dispersing agent is ethanol.
The preparation method of the special modifier for the pervious concrete comprises the following steps:
a. sequentially adding a dispersing agent (ethanol) and deionized water with the total mass of 0.1 time of that of the deionized water into a reaction kettle at the temperature of 10-40 ℃, stirring for 10min at the rotating speed of 120r/min, and adjusting the pH value to 2-3 to obtain a solution A; adding long carbon chain silane (obtained by mixing isobutyl triethoxysilane and dodecyl trimethoxy silane according to the mass ratio of 1: 1) into the solution A, stirring at the rotating speed of 240r/min, and carrying out heat preservation reaction for 40min to obtain the hydrophobing agent.
b. Adding the rest water into production equipment, adding a hydrophobing agent under the condition that the rotating speed is 240r/min, and stirring for 15 min;
c. adding polysiloxane resin, and stirring for 15 min;
d. adding fluorocarbon resin emulsion, and stirring until the fluorocarbon resin emulsion is uniformly dispersed to obtain the special modifier G6 for the pervious concrete.
Example 7
The special modifier for pervious concrete in the embodiment comprises the following components in percentage by mass:
15% of long carbon chain silane, 45% of a dispersing agent, 10% of polysiloxane resin, 10% of fluorocarbon resin emulsion and 20% of deionized water, wherein the long carbon chain silane is hexadecyl trimethoxy silane, and the dispersing agent is acetone.
The preparation method of the special modifier for the pervious concrete comprises the following steps:
a. sequentially adding a dispersing agent (acetone) and deionized water with the total mass of 0.1 time of that of the deionized water into a reaction kettle at the temperature of 10-40 ℃, stirring for 8min at the rotating speed of 80r/min, and adjusting the pH value to 2-3 to obtain a solution A; adding long carbon chain silane (hexadecyl trimethoxy silane) into the solution A, stirring at the rotating speed of 200r/min, and carrying out heat preservation reaction for 30min to obtain the hydrophobing agent.
b. Adding the rest water into production equipment, adding a hydrophobing agent under the condition that the rotating speed is 240r/min, and stirring for 12 min;
c. adding polysiloxane resin, and stirring for 12 min;
d. adding fluorocarbon resin emulsion, and stirring until the fluorocarbon resin emulsion is uniformly dispersed to obtain the special modifier G7 for the pervious concrete.
Example 8
The special modifier for pervious concrete in the embodiment comprises the following components in percentage by mass:
11% of long carbon chain silane, 59% of a dispersing agent, 10% of polysiloxane resin, 10% of fluorocarbon resin emulsion and 10% of deionized water, wherein the long carbon chain silane is dodecyl trimethoxy silane, and the dispersing agent is ethanol.
The preparation method of the special modifier for the pervious concrete comprises the following steps:
a. sequentially adding a dispersing agent (ethanol) and deionized water with the total mass of 0.1 time of that of the deionized water into a reaction kettle at the temperature of 10-40 ℃, stirring for 6min at the rotating speed of 80r/min, and adjusting the pH value to 2-3 to obtain a solution A; adding long carbon chain silane (dodecyl trimethoxy silane) into the solution A, stirring at the rotating speed of 200r/min, and reacting for 30min under heat preservation to obtain the hydrophobing agent.
b. Adding the rest water into production equipment, adding a hydrophobing agent under the condition that the rotating speed is 240r/min, and stirring for 15 min;
c. adding polysiloxane resin, and stirring for 15 min;
d. adding fluorocarbon resin emulsion, and stirring until the fluorocarbon resin emulsion is uniformly dispersed to obtain the special modifier G8 for the pervious concrete.
And (3) verifying the implementation effect:
testing the water permeability coefficient of the modifier special for the pervious concrete in the embodiment 1-8 according to CJJ/T135-plus 2009 technical Specification for pervious cement concrete pavements; the compressive strength of the concrete at different ages is tested according to GB/T50081-2002 Standard of mechanical Properties test method of ordinary concrete(ii) a According to GB/T50082-2009 standard of test method for long-term performance and durability of common concrete, a dry-wet circulation method is adopted to carry out a sulfate corrosion resistance test, namely, the content of Na is 5 percent2SO4Soaking the pervious concrete test block in the solution for 16h, then drying the pervious concrete test block at the temperature of 80 +/-5 ℃ for 6h, cooling the pervious concrete test block for 2h, wherein the cycle time is 24h each time, testing the compressive strength of the pervious concrete test block after 60 cycles, and calculating the corrosion resistance coefficient. The mix proportion of the pervious concrete adopted in the experiment is as follows: P.O42.5 cement 360kg/m31440kg/m of crushed stone (particle size 5-12 mm)3108kg/m of mixing water31.8kg/m of water reducing agent3. The results are shown in Table 2:
TABLE 2 pervious concrete Performance test results
As can be seen from Table 2, compared with the blank group without the special modifier for the pervious concrete, the compressive strength of the pervious concrete prepared by the method of the invention in the 7d and 28d is respectively improved by 38.2-47.3%, 25.8-30.8%, and the water permeability is also improved by 25-55%. In addition, the modifier can form a compact hydrophobic membrane on the surface of the pervious concrete and the inner walls of pore structures such as communication holes, semi-open holes, closed holes and the like, so that the concrete is in a hydrophobic state from the inner surface to the outer surface, the wetting and the permeation of rainwater can be effectively prevented, and the durability is better.
Claims (4)
1. The special modifier for the pervious concrete is characterized by comprising the following components in percentage by mass:
10-15% of long-carbon-chain silane,
45% -60% of a dispersant;
5% -10% of polysiloxane resin;
5% -10% of fluorocarbon resin emulsion;
10% -20% of deionized water;
the mass percentage of the components is 100 percent;
the long carbon chain silane is obtained by mixing isobutyl triethoxysilane and dodecyl trimethoxysilane according to the mass ratio of 1: 1;
the dispersing agent is one of absolute ethyl alcohol, isopropanol and acetone;
the polysiloxane resin is polymethyl siloxane resin with the solid content of more than or equal to 98%, the molecular weight of the polymethyl siloxane resin is 10000-20000, and the viscosity is 1000-5000 cP.
2. The modifier special for pervious concrete as claimed in claim 1, wherein the fluorocarbon resin emulsion is an aqueous fluorocarbon resin emulsion having a solid content of 50% to 60%, a viscosity of 20 mpa.s to 40 mpa.s and a particle size of 0.12 μm to 0.22 μm, and the fluorocarbon resin in the fluorocarbon resin emulsion contains 11.5% to 28.0% by mass of fluorine.
3. The special pervious concrete modifier of claim 1, wherein the special pervious concrete modifier comprises the following components in percentage by mass:
12-15% of long-carbon-chain silane,
45% -50% of a dispersant;
8% -10% of polysiloxane resin;
8% -10% of fluorocarbon resin emulsion;
15% -20% of deionized water;
the mass percentage of the components is 100 percent.
4. The preparation method of the special modifier for pervious concrete as claimed in claim 1, characterized by comprising the following steps:
a. mixing and stirring a dispersing agent, deionized water with the total mass of 0.1-0.2 times of that of the deionized water and long-carbon-chain silane to obtain a hydrophobic agent;
b. adding the rest water into production equipment, adding a hydrophobing agent under the condition that the rotating speed is 240r/min, and stirring for 10-15 min;
c. adding polysiloxane resin, and stirring for 10-15 min;
d. adding fluorocarbon resin emulsion, and stirring until the fluorocarbon resin emulsion is uniformly dispersed to obtain the special modifier for the pervious concrete.
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| CN201810597824.XA CN108706909B (en) | 2018-06-11 | 2018-06-11 | Special modifier for pervious concrete and preparation method thereof |
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| CN201810597824.XA CN108706909B (en) | 2018-06-11 | 2018-06-11 | Special modifier for pervious concrete and preparation method thereof |
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| CN108706909A CN108706909A (en) | 2018-10-26 |
| CN108706909B true CN108706909B (en) | 2021-04-27 |
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