CN110054472B - High-permeability pervious concrete cementing agent - Google Patents
High-permeability pervious concrete cementing agent Download PDFInfo
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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
- C04B28/34—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 cold phosphate binders
- C04B28/344—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 cold phosphate binders the phosphate binder being present in the starting composition solely as one or more phosphates
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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
- C04B2111/00241—Physical properties of the materials not provided for elsewhere in C04B2111/00
- C04B2111/00284—Materials permeable to liquids
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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
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/0075—Uses not provided for elsewhere in C04B2111/00 for road construction
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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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Abstract
The invention provides a high-permeability pervious concrete cementing agent, which comprises the main raw materials of magnesium phosphate cement, polysiloxane, epoxy resin, phenolic resin, hydroxypropyl acrylate, acrylamide, cellulose ether, active silicon dioxide powder, bone glue powder, gelatin, polyvinyl alcohol, pentaerythritol, hydrated calcium sulphoaluminate, calcium carbonate whiskers, sodium dodecyl benzene sulfonate, 2, 4-pentadienoic acid zinc salt, a coupling agent, a defoaming agent, water and the like, has excellent bonding effect, meets the requirement of pavement strength, and can meet the requirement of high-permeability pervious concrete on water permeability.
Description
Technical Field
The invention relates to the technical field of building materials, in particular to a high-permeability pervious concrete cementing agent.
Background
With the development of socio-economic and the progress of urban construction, landmarks of modern cities are gradually covered by house buildings made of reinforced concrete and impermeable road surfaces laid by concrete, and compared with natural soil, the closed urban ground surface brings a series of problems to the cities. The traditional urban concrete pavement blocks water vapor exchange because mortar is condensed, most of surface runoff is formed and flows into rivers through drainage channels, the cost of municipal facilities is increased, flood disasters are easily formed, urban underground water cannot be well supplemented, the ground is lowered, and the urban temperature is raised.
Along with the process of urbanization development of the Chinese sea surface, the pervious concrete pavement is widely applied. The pervious concrete, also called porous concrete, is characterized by that it adopts single-grain coarse aggregate as skeleton, and the cement mortar thin layer is covered on the surface of coarse aggregate granules, and used as cementing layer between aggregate granules so as to form skeleton-porous concrete material with pore structure. The pervious concrete pavement material not only can make rainwater flow into the ground and effectively supplement underground water, but also can effectively eliminate oil compounds in the ground. The road surface is not easy to form accumulated water. The urban diseases such as underground water level reduction, heat island effect and the like caused by closed concrete construction are avoided, the pervious concrete forms heat and moisture exchange with air through the earth surface, the earth surface temperature can be reduced, the humidity is increased, the climate is adjusted, automobile noise can be absorbed by pores, and the ecological conservation function is realized for the city. In recent years, with the enhancement of ecological consciousness, energy conservation and emission reduction are vigorously advocated by the nation, and under the large background, the pervious concrete is widely applied to places such as urban roadways, sidewalks, parking lots, squares, residential areas and the like.
The key raw material of the pervious concrete is a cementing material, which enables concrete particles to be saturated and bonded, and cellular pores are left to form a three-dimensional network section with pores, so that moisture can permeate through the pores. The cementing agent of the traditional pervious concrete takes high-strength portland cement as a bonding material, and the cement is a brittle material, has much lower tensile strength than compressive strength, is easy to plastically crack and has poor toughness. At present, some alternative products exist, but the problems of poor bonding effect, even influence on water permeability and the like generally exist. Overall, the existing pervious concrete material cannot meet the practical requirement of pavement strength.
Disclosure of Invention
The invention aims to provide a high-permeability pervious concrete cementing agent to solve the technical problems that the cementing effect is poor, the pavement strength requirement cannot be met and the like.
In order to achieve the purpose, the invention provides a high-permeability pervious concrete cementing agent, which comprises the following components in parts by weight: 100 parts of magnesium phosphate cement, 15-20 parts of polysiloxane, 25-35 parts of epoxy resin, 12-15 parts of phenolic resin, 13-18 parts of hydroxypropyl acrylate, 3-6 parts of acrylamide, 8-10 parts of cellulose ether, 6-8 parts of active silicon dioxide powder, 3-4 parts of gelatin, 8-10 parts of polyvinyl alcohol, 6-9 parts of pentaerythritol, 4-7 parts of hydrated calcium sulphoaluminate, 10-12 parts of calcium carbonate whisker, 3-4 parts of sodium dodecyl benzene sulfonate, 1-2 parts of 2, 4-zinc pentadienoate, 3-4 parts of a coupling agent, 4-5 parts of a defoaming agent and 45-55 parts of water.
Preferably, the calcium carbonate whisker is organically modified, and the specific method comprises the following steps: and (2) immersing the calcium carbonate whiskers into polyethylene glycol 400, standing for 3-4 hours, filtering, then immersing into polyglycerol ricinoleate, oscillating for 20-30 minutes by ultrasonic waves, filtering, and drying to obtain the calcium carbonate whiskers.
Further preferably, the mass ratio of the calcium carbonate whiskers to the polyethylene glycol 400 to the polyglycerol ricinoleate is 1: 8-10: 8 to 10.
Preferably, the zinc 2, 4-pentadienoate is prepared by the following method: uniformly mixing 2, 4-pentadienoic acid with a sodium hydroxide solution with the mass concentration of 12% to ensure that the pH value is 8-10, adding a zinc nitrate solution with the mass concentration of 10%, stirring and reacting for 30-40 minutes, filtering, washing and drying to obtain the product; the molar ratio of the 2, 4-pentadienoic acid to the zinc nitrate contained in the zinc nitrate solution is 1: 1 to 1.2.
More preferably, the washing is performed 2 to 3 times by using deionized water.
Further preferably, the drying conditions are as follows: drying the mixture for 30 to 60 minutes at the temperature of between 125 and 140 ℃.
Preferably, the coupling agent is selected from any one of silane coupling agents KH550, KH792 or DL 171.
Preferably, the defoaming agent is selected from any one of polyoxyethylene polyoxypropylene ether, polydimethylsiloxane or silicone emulsion.
The preparation process of the high-permeability pervious concrete cementing agent comprises the following specific steps:
(1) firstly, uniformly mixing the magnesium phosphate cement, the active silicon dioxide powder and the hydrated calcium sulphoaluminate in the formula ratio to obtain mixed powder for later use;
(2) then dissolving gelatin, polyvinyl alcohol, hydroxypropyl acrylate, acrylamide, cellulose ether, pentaerythritol and sodium dodecyl benzene sulfonate in formula ratio in water to obtain a mixed solution for later use;
(3) then mixing the polyorganosiloxane, the epoxy resin and the phenolic resin according to the formula ratio to obtain mixed resin for later use;
(4) and (3) finally, adding the mixed powder obtained in the step (1) and the mixed resin obtained in the step (3) into a concrete stirrer, stirring for 2-3 minutes, sequentially adding the calcium carbonate whisker, the 2, 4-pentadienoic acid zinc salt, the coupling agent, the defoaming agent and the mixed solution obtained in the step (2) according to the formula ratio, and stirring for 5-6 minutes to obtain the cementing agent.
Preferably, in the step (1), mixing is realized by using a high-speed mixer, the mixing temperature is 17-19 ℃, and the mixing time is 3-4 minutes.
Preferably, the specific method of step (2) is: dissolving gelatin and polyvinyl alcohol in boiling water, naturally cooling to room temperature (25 ℃), adding hydroxypropyl acrylate, acrylamide, cellulose ether, pentaerythritol and sodium dodecyl benzene sulfonate, and stirring until completely dissolving.
Preferably, in the step (3), an internal mixer is used for mixing, and the process conditions are as follows: the mixing temperature is 35-40 ℃, the rotating speed of the internal mixer is 70-80 r/min, and the mixing time is 5-8 min.
The adhesive is applied to high-permeability pervious concrete.
Preferably, the addition weight ratio of the adhesive in the concrete is 0.2-0.5%.
The invention has the following beneficial effects:
the main raw materials of the invention comprise magnesium phosphate cement, polyorganosiloxane, epoxy resin, phenolic resin, hydroxypropyl acrylate, acrylamide, cellulose ether, active silica powder, gelatin, polyvinyl alcohol, pentaerythritol, calcium sulphoaluminate hydrate, calcium carbonate whisker, sodium dodecyl benzene sulfonate, 2, 4-pentadienoic acid zinc salt, coupling agent, defoaming agent, water and the like, and the invention has excellent bonding effect, meets the requirement of pavement strength and can meet the requirement of high-permeability pervious concrete on water permeability.
The cement is compounded with the polyorganosiloxane, the epoxy resin, the phenolic resin and the like, the main component of the cement is silicate or aluminate and the like, the polyorganosiloxane, the epoxy resin, the phenolic resin and the like have hydroxyl or phenolic hydroxyl, can generate strong hydration with water, and increase the viscosity of cement paste through winding of molecular chains to endow the product with good adhesiveness. In addition, hydration also helps to reduce the rheological properties of the cement slurry and increase water permeability. The hydroxypropyl acrylate has active functional groups such as carbon-carbon double bonds and hydroxyl groups, the acrylamide has active functional groups such as carbon-carbon double bonds and amide, the carbon-carbon double bonds of the hydroxypropyl acrylate and the acrylamide are opened in an alkaline environment of cement hydration to generate polymerization, the amide can be hydrolyzed under an alkaline condition to generate carboxylic acid and amine, and then the carboxylic acid and the amine react with the hydroxyl groups to realize copolymerization and grafting, so that the effects are further enhanced.
The active silicon dioxide powder can perform secondary hydration reaction with calcium hydroxide generated by cement hydration to generate hydrated calcium silicate gel, so that the compactness is increased, and the early strength and the later durability of the pervious concrete are improved.
Gelatin is a macromolecular hydrophilic colloid, belongs to protein, can generate cross-linking reaction with calcium ions, aluminum ions and the like in low-alkali water calcium silicate, and particularly, the protein reacts with the calcium ions, the aluminum ions and the like so as to replace the interaction of carboxyl and amino in the protein, form a special bridge bond effect and increase the strength of a product.
Cellulose ether, polyvinyl alcohol, pentaerythritol and the like have a plurality of hydroxyl groups, and cooperate with polyorganosiloxane to increase the viscosity of cement paste, reduce the rheological property of cement paste and increase water permeability, because cellulose ether, polyvinyl alcohol, pentaerythritol, polyorganosiloxane and the like which are sources of hydroxyl groups are provided along with the strong hydration of the hydroxyl groups and water, and the residual structural groups are tightly wound with silicate or aluminate and the like (main components of cement) to increase the viscosity of the system. The crosslinking function of the 2, 4-pentadienoic acid zinc salt chain structure is characterized by comprising a carbon-carbon double bond and a carbonyl group, wherein the carbon-carbon double bond has an electron donating function, the carbonyl group has an electron withdrawing function, hydroxyl groups of cellulose ether, polyvinyl alcohol and pentaerythritol have an electron withdrawing function, ether bonds in the cellulose ether and alkoxy groups in polyorganosiloxane have an electron donating function, the carbonyl group, the ether bonds, the alkoxy groups and the like are mutually attracted, the carbon-carbon double bond and the hydroxyl groups are mutually attracted, the crosslinking and winding of the polymer are promoted, and the functions can be further enhanced. On the other hand, pentaerythritol can enhance the fluidity of epoxy resin and the like, is beneficial to the obtained cementing agent to penetrate into tiny cracks and gaps on the surface of the structure, and enhances the strength of a cementing interface.
The hydrated calcium sulphoaluminate can expand in volume when the cement is set and hardened, thereby compensating the prestress generated by shrinkage. The use of the coupling agent is beneficial to changing the interface property, increasing the adhesive force and improving the adhesive strength.
In addition to the objects, features and advantages described above, other objects, features and advantages of the present invention are also provided. The present invention will be described in further detail below.
Detailed Description
The following is a detailed description of embodiments of the invention, but the invention can be implemented in many different ways, as defined and covered by the claims.
Example 1:
a high-permeability pervious concrete cementing agent comprises the following components in parts by weight: 100 parts of magnesium phosphate cement, 15 parts of polysiloxane, 25 parts of epoxy resin, 12 parts of phenolic resin, 13 parts of hydroxypropyl acrylate, 3 parts of acrylamide, 8 parts of cellulose ether, 6 parts of active silicon dioxide powder, 3 parts of gelatin, 8 parts of polyvinyl alcohol, 6 parts of pentaerythritol, 4 parts of hydrated calcium sulfoaluminate, 10 parts of calcium carbonate whisker, 3 parts of sodium dodecyl benzene sulfonate, 1 part of 2, 4-pentadienoic acid zinc salt, 3 parts of a coupling agent, 4 parts of a defoaming agent and 45 parts of water.
Wherein, the 2, 4-pentadienoic acid zinc salt is prepared by the following method: uniformly mixing 2, 4-pentadienoic acid with a sodium hydroxide solution with the mass concentration of 12% to ensure that the pH value is 8, adding a zinc nitrate solution with the mass concentration of 10%, stirring and reacting for 30 minutes, filtering, washing and drying to obtain the product; the molar ratio of the 2, 4-pentadienoic acid to the zinc nitrate contained in the zinc nitrate solution is 1: 1. therein, washing was performed 2 times with deionized water. The drying conditions are as follows: drying for 30 minutes at 125 ℃.
The coupling agent is a silane coupling agent KH 550. The defoaming agent is polyoxyethylene polyoxypropylene ether.
The preparation process of the high-permeability pervious concrete cementing agent comprises the following specific steps:
(1) firstly, uniformly mixing the magnesium phosphate cement, the active silicon dioxide powder and the hydrated calcium sulphoaluminate in the formula ratio to obtain mixed powder for later use;
(2) then dissolving gelatin, polyvinyl alcohol, hydroxypropyl acrylate, acrylamide, cellulose ether, pentaerythritol and sodium dodecyl benzene sulfonate in formula ratio in water to obtain a mixed solution for later use;
(3) then mixing the polyorganosiloxane, the epoxy resin and the phenolic resin according to the formula ratio to obtain mixed resin for later use;
(4) and (3) finally, adding the mixed powder obtained in the step (1) and the mixed resin obtained in the step (3) into a concrete stirrer, stirring for 2 minutes, sequentially adding the calcium carbonate crystal whisker, the 2, 4-pentadienoic acid zinc salt, the coupling agent, the defoaming agent and the mixed liquid obtained in the step (2) according to the formula ratio, and stirring for 5-6 minutes to obtain the cementing agent.
In the step (1), mixing is realized by a high-speed mixer, the mixing temperature is 17 ℃, and the mixing time is 3 minutes.
The specific method of the step (2) is as follows: dissolving gelatin and polyvinyl alcohol in boiling water, naturally cooling to room temperature (25 ℃), adding hydroxypropyl acrylate, acrylamide, cellulose ether, pentaerythritol and sodium dodecyl benzene sulfonate, and stirring until completely dissolving.
In the step (3), an internal mixer is used for mixing, and the process conditions are as follows: the mixing temperature is 35 ℃, the rotating speed of the internal mixer is 70 r/min, and the mixing time is 5 min.
Example 2:
a high-permeability pervious concrete cementing agent comprises the following components in parts by weight: 100 parts of magnesium phosphate cement, 20 parts of polysiloxane, 35 parts of epoxy resin, 15 parts of phenolic resin, 18 parts of hydroxypropyl acrylate, 6 parts of acrylamide, 10 parts of cellulose ether, 8 parts of active silicon dioxide powder, 4 parts of gelatin, 10 parts of polyvinyl alcohol, 9 parts of pentaerythritol, 7 parts of hydrated calcium sulphoaluminate, 12 parts of calcium carbonate whisker, 4 parts of sodium dodecyl benzene sulfonate, 2 parts of 2, 4-zinc pentadienoate, 4 parts of coupling agent, 5 parts of defoaming agent and 55 parts of water.
Wherein, the 2, 4-pentadienoic acid zinc salt is prepared by the following method: uniformly mixing 2, 4-pentadienoic acid with a sodium hydroxide solution with the mass concentration of 12% to ensure that the pH value is 10, adding a zinc nitrate solution with the mass concentration of 10%, stirring and reacting for 40 minutes, filtering, washing and drying to obtain the product; the molar ratio of the 2, 4-pentadienoic acid to the zinc nitrate contained in the zinc nitrate solution is 1: 1.2. among them, the mixture was washed 3 times with deionized water. The drying conditions are as follows: drying at 140 ℃ for 60 minutes.
The coupling agent is a silane coupling agent KH 792. The defoaming agent is polydimethylsiloxane.
The preparation process of the high-permeability pervious concrete cementing agent comprises the following specific steps:
(1) firstly, uniformly mixing the magnesium phosphate cement, the active silicon dioxide powder and the hydrated calcium sulphoaluminate in the formula ratio to obtain mixed powder for later use;
(2) then dissolving gelatin, polyvinyl alcohol, hydroxypropyl acrylate, acrylamide, cellulose ether, pentaerythritol and sodium dodecyl benzene sulfonate in formula ratio in water to obtain a mixed solution for later use;
(3) then mixing the polyorganosiloxane, the epoxy resin and the phenolic resin according to the formula ratio to obtain mixed resin for later use;
(4) and (3) finally, adding the mixed powder obtained in the step (1) and the mixed resin obtained in the step (3) into a concrete stirrer, stirring for 3 minutes, sequentially adding the calcium carbonate crystal whisker, the 2, 4-pentadienoic acid zinc salt, the coupling agent, the defoaming agent and the mixed liquid obtained in the step (2) according to the formula ratio, and stirring for 6 minutes to obtain the cementing agent.
In the step (1), mixing is realized by a high-speed mixer, the mixing temperature is 19 ℃, and the mixing time is 4 minutes.
The specific method of the step (2) is as follows: dissolving gelatin and polyvinyl alcohol in boiling water, naturally cooling to room temperature (25 ℃), adding hydroxypropyl acrylate, acrylamide, cellulose ether, pentaerythritol and sodium dodecyl benzene sulfonate, and stirring until completely dissolving.
In the step (3), an internal mixer is used for mixing, and the process conditions are as follows: the mixing temperature is 40 ℃, the rotating speed of the internal mixer is 80 r/min, and the mixing time is 8 min.
Example 3:
a high-permeability pervious concrete cementing agent comprises the following components in parts by weight: 100 parts of magnesium phosphate cement, 15 parts of polysiloxane, 35 parts of epoxy resin, 12 parts of phenolic resin, 18 parts of hydroxypropyl acrylate, 3 parts of acrylamide, 10 parts of cellulose ether, 6 parts of active silicon dioxide powder, 3 parts of gelatin, 10 parts of polyvinyl alcohol, 6 parts of pentaerythritol, 7 parts of hydrated calcium sulphoaluminate, 10 parts of calcium carbonate whisker, 4 parts of sodium dodecyl benzene sulfonate, 1 part of 2, 4-pentadienoic acid zinc salt, 4 parts of coupling agent, 4 parts of defoaming agent and 55 parts of water.
The calcium carbonate whisker is organically modified, and the specific method comprises the following steps: and (2) immersing the calcium carbonate whiskers into polyethylene glycol 400, standing for 3 hours, filtering, then immersing into polyglycerol polyricinoleate, oscillating for 30 minutes by ultrasonic waves, filtering, and drying to obtain the calcium carbonate whiskers. The mass ratio of the calcium carbonate whisker to the polyethylene glycol 400 to the polyglycerol ricinoleate is 1: 8: 10.
the zinc salt of 2, 4-pentadienoic acid is prepared by the following method: uniformly mixing 2, 4-pentadienoic acid with a sodium hydroxide solution with the mass concentration of 12% to ensure that the pH value is 8, adding a zinc nitrate solution with the mass concentration of 10%, stirring and reacting for 40 minutes, filtering, washing and drying to obtain the product; the molar ratio of the 2, 4-pentadienoic acid to the zinc nitrate contained in the zinc nitrate solution is 1: 1. among them, the mixture was washed 3 times with deionized water. The drying conditions are as follows: drying for 60 minutes at 125 ℃.
The coupling agent is a silane coupling agent DL 171. The defoaming agent is emulsified silicone oil.
The preparation process of the high-permeability pervious concrete cementing agent comprises the following specific steps:
(1) firstly, uniformly mixing the magnesium phosphate cement, the active silicon dioxide powder and the hydrated calcium sulphoaluminate in the formula ratio to obtain mixed powder for later use;
(2) then dissolving gelatin, polyvinyl alcohol, hydroxypropyl acrylate, acrylamide, cellulose ether, pentaerythritol and sodium dodecyl benzene sulfonate in formula ratio in water to obtain a mixed solution for later use;
(3) then mixing the polyorganosiloxane, the epoxy resin and the phenolic resin according to the formula ratio to obtain mixed resin for later use;
(4) and (3) finally, adding the mixed powder obtained in the step (1) and the mixed resin obtained in the step (3) into a concrete stirrer, stirring for 2 minutes, sequentially adding the calcium carbonate crystal whisker, the 2, 4-pentadienoic acid zinc salt, the coupling agent, the defoaming agent and the mixed liquid obtained in the step (2) according to the formula ratio, and stirring for 6 minutes to obtain the cementing agent.
In the step (1), mixing is realized by a high-speed mixer, the mixing temperature is 17 ℃, and the mixing time is 4 minutes.
The specific method of the step (2) is as follows: dissolving gelatin and polyvinyl alcohol in boiling water, naturally cooling to room temperature (25 ℃), adding hydroxypropyl acrylate, acrylamide, cellulose ether, pentaerythritol and sodium dodecyl benzene sulfonate, and stirring until completely dissolving.
In the step (3), an internal mixer is used for mixing, and the process conditions are as follows: the mixing temperature is 35 ℃, the rotating speed of the internal mixer is 80 r/min, and the mixing time is 5 min.
Example 4:
a high-permeability pervious concrete cementing agent comprises the following components in parts by weight: 100 parts of magnesium phosphate cement, 20 parts of polysiloxane, 25 parts of epoxy resin, 15 parts of phenolic resin, 13 parts of hydroxypropyl acrylate, 6 parts of acrylamide, 8 parts of cellulose ether, 8 parts of active silicon dioxide powder, 4 parts of gelatin, 8 parts of polyvinyl alcohol, 9 parts of pentaerythritol, 4 parts of hydrated calcium sulphoaluminate, 12 parts of calcium carbonate whisker, 3 parts of sodium dodecyl benzene sulfonate, 2 parts of 2, 4-zinc pentadienoate, 3 parts of a coupling agent, 5 parts of a defoaming agent and 45 parts of water.
The calcium carbonate whisker is organically modified, and the specific method comprises the following steps: and (2) immersing the calcium carbonate whiskers into polyethylene glycol 400, standing for 4 hours, filtering, then immersing into polyglycerol polyricinoleate, oscillating for 20 minutes by ultrasonic waves, filtering, and drying to obtain the calcium carbonate whiskers. The mass ratio of the calcium carbonate whisker to the polyethylene glycol 400 to the polyglycerol ricinoleate is 1: 10: 8.
the zinc salt of 2, 4-pentadienoic acid is prepared by the following method: uniformly mixing 2, 4-pentadienoic acid with a sodium hydroxide solution with the mass concentration of 12% to ensure that the pH value is 10, adding a zinc nitrate solution with the mass concentration of 10%, stirring and reacting for 30 minutes, filtering, washing and drying to obtain the product; the molar ratio of the 2, 4-pentadienoic acid to the zinc nitrate contained in the zinc nitrate solution is 1: 1.2. therein, washing was performed 2 times with deionized water. The drying conditions are as follows: drying for 30 minutes at 140 ℃.
The coupling agent is a silane coupling agent KH 550. The defoaming agent is polyoxyethylene polyoxypropylene ether.
The preparation process of the high-permeability pervious concrete cementing agent comprises the following specific steps:
(1) firstly, uniformly mixing the magnesium phosphate cement, the active silicon dioxide powder and the hydrated calcium sulphoaluminate in the formula ratio to obtain mixed powder for later use;
(2) then dissolving gelatin, polyvinyl alcohol, hydroxypropyl acrylate, acrylamide, cellulose ether, pentaerythritol and sodium dodecyl benzene sulfonate in formula ratio in water to obtain a mixed solution for later use;
(3) then mixing the polyorganosiloxane, the epoxy resin and the phenolic resin according to the formula ratio to obtain mixed resin for later use;
(4) and (3) finally, adding the mixed powder obtained in the step (1) and the mixed resin obtained in the step (3) into a concrete stirrer, stirring for 3 minutes, sequentially adding the calcium carbonate crystal whisker, the 2, 4-pentadienoic acid zinc salt, the coupling agent, the defoaming agent and the mixed liquid obtained in the step (2) according to the formula ratio, and stirring for 5 minutes to obtain the cementing agent.
In the step (1), mixing is realized by a high-speed mixer, the mixing temperature is 19 ℃, and the mixing time is 3 minutes.
The specific method of the step (2) is as follows: dissolving gelatin and polyvinyl alcohol in boiling water, naturally cooling to room temperature (25 ℃), adding hydroxypropyl acrylate, acrylamide, cellulose ether, pentaerythritol and sodium dodecyl benzene sulfonate, and stirring until completely dissolving.
In the step (3), an internal mixer is used for mixing, and the process conditions are as follows: the mixing temperature is 40 ℃, the rotating speed of the internal mixer is 70 r/min, and the mixing time is 8 min.
Example 5:
a high-permeability pervious concrete cementing agent comprises the following components in parts by weight: 100 parts of magnesium phosphate cement, 18 parts of polysiloxane, 30 parts of epoxy resin, 14 parts of phenolic resin, 15 parts of hydroxypropyl acrylate, 4 parts of acrylamide, 9 parts of cellulose ether, 7 parts of active silicon dioxide powder, 3 parts of gelatin, 9 parts of polyvinyl alcohol, 7 parts of pentaerythritol, 6 parts of hydrated calcium sulphoaluminate, 11 parts of calcium carbonate whisker, 3 parts of sodium dodecyl benzene sulfonate, 2 parts of 2, 4-pentadienoic acid zinc salt, 3 parts of a coupling agent, 5 parts of a defoaming agent and 50 parts of water.
The calcium carbonate whisker is organically modified, and the specific method comprises the following steps: and (2) immersing the calcium carbonate whiskers into polyethylene glycol 400, standing for 3 hours, filtering, then immersing into polyglycerol polyricinoleate, oscillating for 25 minutes by ultrasonic waves, filtering, and drying to obtain the calcium carbonate whiskers. The mass ratio of the calcium carbonate whisker to the polyethylene glycol 400 to the polyglycerol ricinoleate is 1: 9: 9.
the zinc salt of 2, 4-pentadienoic acid is prepared by the following method: uniformly mixing 2, 4-pentadienoic acid with a sodium hydroxide solution with the mass concentration of 12% to ensure that the pH is 9, adding a zinc nitrate solution with the mass concentration of 10%, stirring and reacting for 35 minutes, filtering, washing and drying to obtain the product; the molar ratio of the 2, 4-pentadienoic acid to the zinc nitrate contained in the zinc nitrate solution is 1: 1.1. among them, the mixture was washed 3 times with deionized water. The drying conditions are as follows: oven drying at 130 deg.C for 45 min.
The coupling agent is a silane coupling agent KH 792. The defoaming agent is polydimethylsiloxane.
The preparation process of the high-permeability pervious concrete cementing agent comprises the following specific steps:
(1) firstly, uniformly mixing the magnesium phosphate cement, the active silicon dioxide powder and the hydrated calcium sulphoaluminate in the formula ratio to obtain mixed powder for later use;
(2) then dissolving gelatin, polyvinyl alcohol, hydroxypropyl acrylate, acrylamide, cellulose ether, pentaerythritol and sodium dodecyl benzene sulfonate in formula ratio in water to obtain a mixed solution for later use;
(3) then mixing the polyorganosiloxane, the epoxy resin and the phenolic resin according to the formula ratio to obtain mixed resin for later use;
(4) and (3) finally, adding the mixed powder obtained in the step (1) and the mixed resin obtained in the step (3) into a concrete stirrer, stirring for 3 minutes, sequentially adding the calcium carbonate crystal whisker, the 2, 4-pentadienoic acid zinc salt, the coupling agent, the defoaming agent and the mixed liquid obtained in the step (2) according to the formula ratio, and stirring for 5 minutes to obtain the cementing agent.
In the step (1), mixing is realized by a high-speed mixer, the mixing temperature is 18 ℃, and the mixing time is 3 minutes.
The specific method of the step (2) is as follows: dissolving gelatin and polyvinyl alcohol in boiling water, naturally cooling to room temperature (25 ℃), adding hydroxypropyl acrylate, acrylamide, cellulose ether, pentaerythritol and sodium dodecyl benzene sulfonate, and stirring until completely dissolving.
In the step (3), an internal mixer is used for mixing, and the process conditions are as follows: the mixing temperature is 38 ℃, the rotating speed of the internal mixer is 80 r/min, and the mixing time is 7 min.
Comparative example 1
The polyorganosiloxane was omitted and the procedure of example 1 was repeated.
Comparative example 2
The epoxy resin was omitted and the rest was the same as in example 1.
Comparative example 3
The phenolic resin was omitted and the remainder was the same as in example 1.
Comparative example 4
Hydroxypropyl acrylate and acrylamide were omitted and the remainder was the same as in example 1.
Comparative example 5
The cellulose ether was omitted and the rest was the same as in example 1.
Comparative example 6
The active silica powder was omitted and the remainder was the same as in example 1.
Comparative example 7
The gelatin was omitted and the rest was the same as in example 1.
Comparative example 8
The polyvinyl alcohol was omitted and the rest was the same as in example 1.
Comparative example 9
The pentaerythritol was omitted and the rest was the same as in example 1.
Comparative example 10
The hydrated calcium sulfoaluminate is omitted and the rest is the same as in example 1.
Comparative example 11
The calcium carbonate whiskers were omitted and the procedure of example 1 was followed.
Comparative example 12
The zinc salt of 2, 4-pentadienoic acid was omitted and the remainder was the same as in example 1.
Test examples
The cementing agents of examples 1 to 5 or comparative examples 1 to 12 were added to the concrete in a weight ratio of 0.3%, then water in an amount of 0.07 times the weight of the concrete was added, mixed uniformly, cured, and various properties of the obtained concrete were measured, and the results are shown in table 1.
TABLE 1 Performance test results
As can be seen from Table 1, the concrete obtained by mixing the cementing agents of examples 1-5 has excellent compressive strength and excellent water permeability, wherein the calcium carbonate whiskers are not organically modified in examples 1 and 2, and the compressive strength and the water permeability are slightly poor. Comparative example 1 omitted polyorganosiloxane, comparative example 2 omitted epoxy resin, comparative example 3 omitted phenolic resin, comparative example 4 omitted hydroxypropyl acrylate and acrylamide, comparative example 5 omitted cellulose ether, comparative example 6 omitted active silica powder, comparative example 7 omitted gelatin, comparative example 8 omitted polyvinyl alcohol, comparative example 9 omitted pentaerythritol, comparative example 10 omitted hydrated calcium sulfoaluminate, comparative example 11 omitted calcium carbonate whiskers, comparative example 12 omitted 2, 4-pentadienoic acid zinc salt, and the compressive strength and water permeability of concrete were significantly poorer.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. The high-permeability pervious concrete cementing agent is characterized by comprising the following components in parts by weight: 100 parts of magnesium phosphate cement, 15-20 parts of polysiloxane, 25-35 parts of epoxy resin, 12-15 parts of phenolic resin, 13-18 parts of hydroxypropyl acrylate, 3-6 parts of acrylamide, 8-10 parts of cellulose ether, 6-8 parts of active silicon dioxide powder, 3-4 parts of gelatin, 8-10 parts of polyvinyl alcohol, 6-9 parts of pentaerythritol, 4-7 parts of hydrated calcium sulphoaluminate, 10-12 parts of calcium carbonate whisker, 3-4 parts of sodium dodecyl benzene sulfonate, 1-2 parts of 2, 4-zinc pentadienoate, 3-4 parts of a coupling agent, 4-5 parts of a defoaming agent and 45-55 parts of water;
the calcium carbonate whisker is organically modified, and the specific method comprises the following steps: and (2) immersing the calcium carbonate whiskers into polyethylene glycol 400, standing for 3-4 hours, filtering, then immersing into polyglycerol ricinoleate, oscillating for 20-30 minutes by ultrasonic waves, filtering, and drying to obtain the calcium carbonate whiskers.
2. The high-permeability pervious concrete cement of claim 1, wherein the zinc 2, 4-pentadienoate salt is prepared by the following method: uniformly mixing 2, 4-pentadienoic acid with a sodium hydroxide solution with the mass concentration of 12% to ensure that the pH is = 8-10, adding a zinc nitrate solution with the mass concentration of 10%, stirring and reacting for 30-40 minutes, filtering, washing and drying to obtain the product; the molar ratio of the 2, 4-pentadienoic acid to the zinc nitrate contained in the zinc nitrate solution is 1: 1 to 1.2.
3. The pervious concrete cementitious agent of claim 1, wherein the coupling agent is selected from any one of silane coupling agents KH550, KH792 or DL 171.
4. The high-permeability pervious concrete cement of claim 1, wherein the defoaming agent is selected from any one of polyoxyethylene polyoxypropylene ether, polydimethylsiloxane or silicone emulsion.
5. The preparation process of the high-permeability pervious concrete cementing agent disclosed by any one of claims 1 to 4 is characterized by comprising the following specific steps of:
(1) firstly, uniformly mixing the magnesium phosphate cement, the active silicon dioxide powder and the hydrated calcium sulphoaluminate in the formula ratio to obtain mixed powder for later use;
(2) then dissolving gelatin, polyvinyl alcohol, hydroxypropyl acrylate, acrylamide, cellulose ether, pentaerythritol and sodium dodecyl benzene sulfonate in formula ratio in water to obtain a mixed solution for later use;
(3) then mixing the polyorganosiloxane, the epoxy resin and the phenolic resin according to the formula ratio to obtain mixed resin for later use;
(4) and (3) finally, adding the mixed powder obtained in the step (1) and the mixed resin obtained in the step (3) into a concrete stirrer, stirring for 2-3 minutes, sequentially adding the calcium carbonate whisker, the 2, 4-pentadienoic acid zinc salt, the coupling agent, the defoaming agent and the mixed solution obtained in the step (2) according to the formula ratio, and stirring for 5-6 minutes to obtain the cementing agent.
6. The preparation process according to claim 5, wherein in the step (1), the mixing is realized by a high-speed mixer, the mixing temperature is 17-19 ℃, and the mixing time is 3-4 minutes.
7. The preparation process according to claim 5, wherein the specific method of the step (2) is as follows: dissolving gelatin and polyvinyl alcohol in boiling water, naturally cooling to room temperature, adding hydroxypropyl acrylate, acrylamide, cellulose ether, pentaerythritol and sodium dodecyl benzene sulfonate, and stirring until completely dissolved.
8. The preparation process according to claim 5, wherein in the step (3), the mixing is realized by an internal mixer, and the process conditions are as follows: the mixing temperature is 35-40 ℃, the rotating speed of the internal mixer is 70-80 r/min, and the mixing time is 5-8 min.
9. The use of a high permeability pervious concrete binder as claimed in any one of claims 1 to 4 in high permeability pervious concrete.
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