Water permeable concrete reinforcing agent and method of making same

Abstract

The application discloses a pervious concrete reinforcing agent, which is modified kaolin, water-retaining agent, active filler, and sodium lignosulfonate aqueous solution, wherein the mass ratio of the modified kaolin, the water-retaining agent, the active filler, and the sodium lignosulfonate aqueous solution is (4-7):3:(2-5):5. The pervious concrete reinforcing agent of the application uses the modified kaolin, the water-retaining agent, the active filler, and the sodium lignosulfonate aqueous solution, and through the coordination and cooperation of the raw materials, the compressive strength performance and the wear resistance of the product are optimized, the coordination improvement of the water permeability, the strength, and the wear resistance is realized, and the anti-freezing and weather-resistant stability of the product is significantly improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of concrete reinforcing agent, and particularly relates to a pervious concrete reinforcing agent and a preparation method thereof. BACKGROUND

[0002] Sponge city is a new generation of urban rainwater management concept, which refers to the ability of a city to adapt to environmental changes and cope with natural disasters caused by rainwater, etc.

[0003] In order to improve the water permeability of the existing pervious concrete, the compressive strength performance and wear resistance of the product are poor, and the product is difficult to realize the coordinated improvement of water permeability, strength and wear resistance, and the product has poor frost resistance and weather resistance stability, which limits the use efficiency of the product.

[0004] Patent No. CN102515608B discloses a modified metakaolin-based concrete anti-permeability and anti-cracking agent. The modified metakaolin is prepared by the following steps: 1) dry washed kaolin is put into a ball mill for powder grinding to obtain kaolin powder; 2) the kaolin powder is calcined at a temperature of 500-1000 DEG C for 0.5-6.0 hours to obtain metakaolin; 3) the metakaolin is put into a dispersing machine, and an organic modifier, amino sulfonate or triethanolamine, is added, the mass ratio of metakaolin to organic modifier is 5000:1-100:1, the dispersing time is 15-35 min, the contact angle is 50 DEG-100 DEG, and the specific surface area is 8000-15000 m2 / kg to obtain modified metakaolin. The modified metakaolin prepared by the technology can significantly reduce the drying shrinkage of concrete, enhance the bonding force between cement paste and coarse aggregate, and thus improve the compressive strength of concrete, but at the same time, the porosity of the concrete is reduced, which affects the water permeability.

[0005] Patent No. CN107572864B discloses a water permeable concrete reinforcing agent and a preparation method. The water permeable concrete reinforcing agent comprises the following raw materials in parts by weight: alcohol amine organic compound 50-80 parts, polyoxyethylene alkyl phenol ether 40-60 parts, polyol 20-30 parts, calcium carbonate whisker 15-25 parts, sodium lignosulfonate 10-20 parts, dioctyl sulfosuccinic acid sodium 4-8 parts, rare earth aluminic ester coupling agent 3-5 parts, sodium tripolyphosphate 5-10 parts, and antioxidant 1-3 parts. The formula of the technology uses sodium lignosulfonate and dioctyl sulfosuccinic acid sodium as water reducing agent, which has significant water reducing effect, can effectively prevent cement particle agglomeration, improve the fluidity of concrete processing, reduce the amount of cement, and save cost. However, the alcohol amine organic compound and polyoxyethylene alkyl phenol ether organic compound are used as main raw materials in the technical solution, which makes the cost of the reinforcing agent high. SUMMARY

[0006] In view of the defects of the prior art, the purpose of the present application is to provide a pervious concrete reinforcing agent and a preparation method thereof to solve the problems raised in the background art.

[0007] The present application solves the technical problems by adopting the following technical solutions:

[0008] The present application provides a pervious concrete reinforcing agent, which is a modified kaolin, a water-retaining agent, an active filler, and a sodium lignosulfonate aqueous solution, wherein the mass ratio of the modified kaolin, the water-retaining agent, the active filler, and the sodium lignosulfonate aqueous solution is (4-7):3:(2-5):5.

[0009] Preferably, the mass fraction of the sodium lignosulfonate aqueous solution is 5-8%, and the water-retaining agent is hydroxyethyl cellulose.

[0010] Preferably, the preparation method of the modified kaolin is as follows:

[0011] S01: Stir the kaolin in a sufficient amount of potassium permanganate solution, then wash with water, filter, and dry. Preheat the dried kaolin at 55-60°C for 1h to obtain preheated kaolin;

[0012] S02: Preparation of a modification liquid:

[0013] S02a: Add 1-3 parts of silane coupling agent KH550, 2-4 parts of a 4% mass fraction urea solution, and 3-5 parts of zeolite to 5-8 parts of a lanthanum chloride solution, and stir uniformly to obtain a zeolite liquid;

[0014] S02b: Add 4-7 parts of sepiolite fiber and 2-4 parts of nano-aluminum oxide to 5-8 parts of a sodium citrate solution, and stir thoroughly to obtain a fiber liquid;

[0015] S02c: Ultrasonically treat the fiber liquid and the zeolite liquid in a weight ratio of 3:5 to obtain a modification liquid;

[0016] S03: Stir and modify the preheated kaolin and the modification liquid in a weight ratio of 3:5, filter and dry after stirring, and obtain modified kaolin.

[0017] Preferably, the mass fraction of the potassium permanganate solution is 5-8%, and the mass fraction of the lanthanum chloride solution is 2-5%.

[0018] Preferably, the ultrasonic treatment has an ultrasonic power of 350-400W and is performed for 20min, and the stirring modification treatment has a stirring speed of 550-650r / min and is performed for 1h.

[0019] Preferably, the preparation method of the active filler is as follows:

[0020] S101, Preparation of a nano-titanium dioxide liquid:

[0021] 2-4 parts of pretreated nano-titanium dioxide, 2-3 parts of hydrotalcite are added into 5-8 parts of sodium silicate solution to stir uniformly, and nano-titanium dioxide liquid is obtained;

[0022] S102, 3-5 parts of volcanic rock, 1-2 parts of nano-silica sol are added into 5-8 parts of nano-titanium dioxide liquid, then 2-4 parts of citric acid is added, and stirring is fully carried out, finally, filtration and drying are carried out, and the active filler is obtained.

[0023] Preferably, the mass fraction of the sodium silicate solution is 5-8%.

[0024] Preferably, the pretreated nano-titanium dioxide is prepared by sintering nano-titanium dioxide and yttrium oxide at a weight ratio of 5:2 at 110-130 DEG C for 1 h, and then cooling to room temperature.

[0025] The application further provides a preparation method of the pervious concrete reinforcing agent, which comprises the following steps: blending and ball-milling the modified kaolin, the water retaining agent, the active filler and the sodium lignosulfonate aqueous solution sufficiently, and then performing filtration and drying to obtain the pervious concrete reinforcing agent.

[0026] Preferably, the ball-milling speed is 1000-1500 r / min, and the ball-milling time is 2 h.

[0027] Compared with the prior art, the application has the following beneficial effects:

[0028] (1) The pervious concrete reinforcing agent of the application is prepared by mixing the modified kaolin, the water retaining agent, the active filler and the sodium lignosulfonate aqueous solution, so that the compressive strength performance and the wear resistance of the product are optimized, the water permeability, the strength and the wear resistance are improved coordinately, and the anti-freezing and weather-resistant stability of the product is significantly improved.

[0029] (2) In the pervious concrete reinforcing agent of the application, the sodium lignosulfonate aqueous solution acts as a water reducing agent, which reduces the cement particle agglomeration effect, reduces the water consumption and maintains the stability of the internal through pores of the concrete; the adsorption and dispersion of the modified kaolin avoid the pore blockage caused by the excessive water reducing agent and optimize the pore connectivity; the hydroxyethyl cellulose acts as a water retaining agent, which delays the cement hydration process, reduces the shrinkage cracks, and the flexible structure of the molecular chain can absorb impact energy and improve the toughness of the concrete.

[0030] (3) The kaolin is treated by potassium permanganate solution, the surface hydroxyl activity is enhanced, the activity performance is optimized, the activity performance of the kaolin is enhanced by preheating improvement, the surface is improved by stirring the modified liquid, the fiber liquid and zeolite liquid in the modified liquid are ultrasonically improved, the sodium citrate solution obtained by blending the sepiolite fiber and nano alumina is adjusted to prepare the fiber liquid, the zeolite liquid is adjusted and improved, the raw materials such as zeolite in the zeolite liquid are matched with each other, the modified kaolin prepared has the performance coordination of the product in the system, the interfacial bonding force with the cement matrix and the performance stability are improved; the silane coupling agent KH550 and sepiolite fiber are compounded to modify, the microstructure with hierarchical pores is formed, the nano alumina is introduced to fill the micropores, the proportion of invalid pores is reduced, the water permeation path is more efficient, the water permeation coefficient has higher improvement potential than the ordinary kaolin enhancement scheme; meanwhile, the modified kaolin is strengthened by the interface between the silane coupling agent KH550 and the sepiolite fiber, the bonding strength between the cement matrix and the aggregate is improved, the nano filling effect of the nano alumina is combined, the compressive strength is improved, the sepiolite fiber forms a three-dimensional network structure in the concrete, the crack bridging inhibits the wear expansion, the water-reducing effect of the sodium lignosulfonate reduces the surface bleeding, the surface compactness and the wear resistance are improved;

[0031] (4) The active filler realizes the function through "physical-chemical synergistic effect": the porous framework of the volcanic rock provides physical support, the nano material (TiO2, SiO2) plays a surface effect and small size effect, and the sodium silicate-hydrotalcite system forms an alkaline microenvironment, which together promotes the sustained reaction of the active components of the volcanic ash, and finally forms a dense network structure, which significantly improves the mechanical properties while ensuring water permeability. Specifically, the active filler is improved by mixing volcanic rock, nano silicon sol and nano titanium dioxide liquid with citric acid, the pre-treated nano titanium dioxide in the nano titanium dioxide liquid, hydrotalcite and sodium silicate solution are blended and prepared, and the pre-treated nano titanium dioxide is improved by sintering nano titanium dioxide and yttrium oxide at 110-130°C. Through the coordination and improvement of the raw materials, the active filler is a composite formula containing volcanic rock (porous adsorption) and nano silicon sol (promoting hydration reaction). Through the secondary hydration reaction between volcanic rock and cement hydration products, enhanced substances such as C-S-H gel are generated to fill pores and improve strength. The high surface activity of nano silicon sol can quickly react with cement hydration products to promote the hydration process and refine the microstructure. The sodium silicate solution acts as an alkaline activator to activate the potential cementitious components in the volcanic rock, improve the reactivity of the volcanic ash, and improve the compressive strength better than single mineral admixture. The active filler contains pre-treated nano titanium dioxide and volcanic rock. The nano titanium dioxide improves the surface wear resistance through high-hardness nano particles (TiO2), and the volcanic rock buffers the wear stress through pores, so the wear resistance is significantly higher than that of traditional silica ash enhancement scheme. The active filler is further mixed with modified kaolin to improve the coordination of the product performance, water permeability, strength and wear resistance, and the product has excellent anti-freezing and weather-resistant stability. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present application will be described clearly and completely below in combination with specific embodiments. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0033] The water permeable concrete reinforcing agent of the present embodiment is a modified kaolin, a water retaining agent, an active filler and a sodium lignosulfonate aqueous solution, wherein the mass ratio of the modified kaolin, the water retaining agent, the active filler and the sodium lignosulfonate aqueous solution is (4-7):3:(2-5):5.

[0034] The mass fraction of the sodium lignosulfonate aqueous solution of the present embodiment is 5-8%.

[0035] The preparation method of the modified kaolin of the present embodiment is:

[0036] S01: Stir the kaolin in a sufficient amount of potassium permanganate solution, then wash with water, filter, and dry. Preheat the dried kaolin at 55-60°C for 1h to obtain preheated kaolin;

[0037] S02: Preparation of the modification liquid:

[0038] S02a: Add 1-3 parts of silane coupling agent KH550, 2-4 parts of 4% mass fraction urea solution, and 3-5 parts of zeolite to 5-8 parts of lanthanum chloride solution, and stir until uniform to obtain a zeolite liquid;

[0039] S02b: Add 4-7 parts of sepiolite fiber and 2-4 parts of nano-alumina to 5-8 parts of sodium citrate solution, and stir until uniform to obtain a fiber liquid;

[0040] S02c: Ultrasonically treat the fiber liquid and the zeolite liquid in a weight ratio of 3:5 to obtain a modification liquid;

[0041] S03: Stir and modify the preheated kaolin and the modification liquid in a weight ratio of 3:5. After stirring, filter and dry to obtain modified kaolin.

[0042] The mass fraction of the potassium permanganate solution in this embodiment is 5-8%; the mass fraction of the lanthanum chloride solution is 2-5%.

[0043] The ultrasonic treatment in this embodiment has an ultrasonic power of 350-400W and is performed for 20min; the stirring modification treatment has a stirring speed of 550-650r / min and is performed for 1h.

[0044] The preparation method of the active filler in this embodiment is:

[0045] S101, Preparation of nano-titanium dioxide liquid:

[0046] Add 2-4 parts of pretreated nano-titanium dioxide and 2-3 parts of hydrotalcite to 5-8 parts of sodium silicate solution and stir until uniform to obtain nano-titanium dioxide liquid;

[0047] S102, Add 3-5 parts of volcanic rock and 1-2 parts of nano-silica sol to 5-8 parts of nano-titanium dioxide liquid, then add 2-4 parts of citric acid, stir until uniform, and finally filter and dry to obtain an active filler.

[0048] The mass fraction of the sodium silicate solution in this embodiment is 5-8%.

[0049] The pretreated nano-titanium dioxide in this embodiment is prepared by mixing nano-titanium dioxide and yttrium oxide in a weight ratio of 5:2, sintering at 110-130°C for 1h, and cooling to room temperature after sintering.

[0050] The preparation method of the pervious concrete reinforcing agent of the embodiment comprises the following steps: blending and ball-milling a modified kaolin, a water-retaining agent, an active filler, and a sodium lignosulfonate aqueous solution sufficiently, and then performing suction filtration and drying to obtain the pervious concrete reinforcing agent.

[0051] The ball-milling speed of the blending and ball-milling of the embodiment is 1000-1500 r / min, and the ball-milling time is 2 h.

[0052] Embodiment 1.

[0053] The pervious concrete reinforcing agent of the embodiment is a modified kaolin, a hydroxyethyl cellulose, an active filler, and a sodium lignosulfonate aqueous solution, wherein the mass ratio of the modified kaolin, the hydroxyethyl cellulose, the active filler, and the sodium lignosulfonate aqueous solution is 4:3:2:5.

[0054] The mass fraction of the sodium lignosulfonate aqueous solution of the embodiment is 5%.

[0055] The preparation method of the modified kaolin of the embodiment is as follows:

[0056] S01: stirring the kaolin in a sufficient amount of potassium permanganate solution sufficiently, and then performing water washing, suction filtration, and drying, and preheating the dried kaolin at 55°C for 1 h to obtain preheated kaolin;

[0057] S02: preparation of a modification liquid:

[0058] S02a: adding 1 part of silane coupling agent KH550, 2 parts of a 4% mass fraction urea solution, and 3 parts of zeolite to 5 parts of a lanthanum chloride solution, and stirring uniformly to obtain a zeolite liquid;

[0059] S02b: adding 4 parts of sepiolite fibers and 2 parts of nano-aluminum oxide to 5-8 parts of a sodium citrate solution, and stirring sufficiently to obtain a fiber liquid;

[0060] S02c: ultrasonic treatment of the fiber liquid and the zeolite liquid according to a weight ratio of 3:5 to obtain a modification liquid;

[0061] S03: stirring and modifying the preheated kaolin and the modification liquid according to a weight ratio of 3:5, performing suction filtration and drying after the stirring is completed to obtain modified kaolin.

[0062] The mass fraction of the potassium permanganate solution of the embodiment is 5%, and the mass fraction of the lanthanum chloride solution is 2%.

[0063] The ultrasonic treatment of the embodiment is performed at an ultrasonic power of 350 W for 20 min, and the stirring and modification treatment is performed at a stirring speed of 550 r / min for 1 h.

[0064] The preparation method of the active filler of the embodiment is as follows:

[0065] S101, preparation of the nano-titanium dioxide liquid:

[0066] 2 parts of the pretreated nano-titanium dioxide and 2 parts of the hydrotalcite were added into 5 parts of the sodium silicate solution and stirred uniformly to obtain the nano-titanium dioxide liquid;

[0067] S102, 3 parts of the volcanic rock and 1 part of the nano-silica sol were added into 5 parts of the nano-titanium dioxide liquid, followed by adding 2 parts of the citric acid, fully stirring, and finally filtering and drying to obtain the active filler.

[0068] The mass fraction of the sodium silicate solution of the embodiment is 5%.

[0069] The pretreated nano-titanium dioxide of the embodiment was prepared by mixing nano-titanium dioxide and yttrium oxide at a weight ratio of 5:2, sintering at 110℃ for 1h, and cooling to room temperature after sintering.

[0070] The preparation method of the water permeable concrete reinforcing agent of the embodiment comprises the following steps: mixing and ball-milling the modified kaolin, the water retaining agent, the active filler, and the sodium lignosulfonate aqueous solution sufficiently, and then filtering and drying to obtain the water permeable concrete reinforcing agent.

[0071] The ball-milling speed of the mixing and ball-milling step of the embodiment is 1000r / min, and the ball-milling time is 2h.

[0072] Embodiment 2.

[0073] The water permeable concrete reinforcing agent of the embodiment comprises modified kaolin, hydroxyethyl cellulose, an active filler, and a sodium lignosulfonate aqueous solution, and the mass ratio of the modified kaolin, the hydroxyethyl cellulose, the active filler, and the sodium lignosulfonate aqueous solution is 7:3:5:5.

[0074] The mass fraction of the sodium lignosulfonate aqueous solution of the embodiment is 8%.

[0075] The preparation method of the modified kaolin of the embodiment is as follows:

[0076] S01: The kaolin was fully stirred in a sufficient amount of potassium permanganate solution, and then washed with water, filtered, and dried. The dried kaolin was preheated at 60℃ for 1h to obtain the preheated kaolin;

[0077] S02: Preparation of the modification liquid:

[0078] S02a: 3 parts of the silane coupling agent KH550, 4 parts of a urea solution with a mass fraction of 4%, and 5 parts of zeolite were added into 8 parts of a lanthanum chloride solution and stirred uniformly to obtain the zeolite liquid;

[0079] S02b: 7 parts of meerschaum fiber, 4 parts of nano-alumina were blended into 8 parts of sodium citrate solution, stirred fully, and a fiber liquid was obtained;

[0080] S02c: the fiber liquid and the zeolite liquid were ultrasonically treated according to a weight ratio of 3:5, and a modified liquid was obtained;

[0081] S03: the preheated kaolin and the modified liquid were modified by stirring according to a weight ratio of 3:5, stirring was stopped, and filtration and drying were performed, and modified kaolin was obtained.

[0082] The mass fraction of the potassium permanganate solution in this embodiment was 8%; and the mass fraction of the lanthanum chloride solution was 5%.

[0083] The ultrasonic power of the ultrasonic treatment in this embodiment was 400 W, and the ultrasonic treatment was performed for 20 min; the stirring speed of the stirring modification treatment was 650 r / min, and the stirring modification treatment was performed for 1 h.

[0084] The preparation method of the active filler in this embodiment was as follows:

[0085] S101: preparation of a nano-titania liquid:

[0086] 4 parts of pretreated nano-titania and 3 parts of hydrotalcite were added into 8 parts of sodium silicate solution and stirred uniformly, and a nano-titania liquid was obtained.

[0087] S102: 5 parts of volcanic rock and 2 parts of nano-silica sol were added into 8 parts of the nano-titania liquid, and then 4 parts of citric acid were added, and stirring was performed fully, and finally filtration and drying were performed, and an active filler was obtained.

[0088] The mass fraction of the sodium silicate solution in this embodiment was 8%.

[0089] The pretreated nano-titania in this embodiment was prepared by mixing nano-titania and yttrium oxide according to a weight ratio of 5:2, sintering at 130℃ for 1 h, and cooling to room temperature after sintering.

[0090] The preparation method of the pervious concrete reinforcing agent in this embodiment included the following steps: the modified kaolin, the water-retaining agent, the active filler, and a sodium lignosulfonate aqueous solution were blended and ball-milled fully, and then filtration and drying were performed, and a pervious concrete reinforcing agent was obtained.

[0091] The ball-milling speed of the blending and ball-milling fully in this embodiment was 1500 r / min, and the ball-milling was performed for 2 h.

[0092] Embodiment 3.

[0093] The water permeable concrete reinforcing agent of the embodiment is a modified kaolin, a hydroxyethyl cellulose, an active filler and a sodium lignosulfonate aqueous solution, wherein the mass ratio of the modified kaolin, the hydroxyethyl cellulose, the active filler and the sodium lignosulfonate aqueous solution is 5.5:3:3.5:5.

[0094] The mass fraction of the sodium lignosulfonate aqueous solution of the embodiment is 6.5%.

[0095] The preparation method of the modified kaolin of the embodiment is as follows:

[0096] S01: The kaolin is stirred in a sufficient amount of potassium permanganate solution, then washed with water, filtered and dried, and the dried kaolin is preheated at 57℃ for 1h to obtain preheated kaolin;

[0097] S02: Preparation of a modification liquid:

[0098] S02a: 2 parts of silane coupling agent KH550, 3 parts of a 4% mass fraction urea solution and 4 parts of zeolite are added to 6.5 parts of a lanthanum chloride solution, and stirred uniformly to obtain a zeolite liquid;

[0099] S02b: 5.5 parts of sepiolite fiber and 3 parts of nano-aluminum oxide are added to 6.5 parts of a sodium citrate solution, and stirred sufficiently to obtain a fiber liquid;

[0100] S02c: The fiber liquid and the zeolite liquid are ultrasonically treated according to a weight ratio of 3:5 to obtain a modification liquid;

[0101] S03: The preheated kaolin and the modification liquid are modified by stirring according to a weight ratio of 3:5, and after the stirring is completed, the mixture is filtered and dried to obtain modified kaolin.

[0102] The mass fraction of the potassium permanganate solution of the embodiment is 6.5%, and the mass fraction of the lanthanum chloride solution is 3.5%.

[0103] The ultrasonic treatment of the embodiment has an ultrasonic power of 375W and is performed for 20min, and the stirring modification treatment has a stirring speed of 600r / min and is performed for 1h.

[0104] The preparation method of the active filler of the embodiment is as follows:

[0105] S101, Preparation of a nano-titania liquid:

[0106] 3 parts of pretreated nano-titania and 2.5 parts of hydrotalcite are added to 6.5 parts of a sodium silicate solution and stirred uniformly to obtain a nano-titania liquid;

[0107] S102, 4 parts of volcanic rock, 1.5 parts of nano silicon sol are added into 6.5 parts of nano titanium dioxide liquid, then 3 parts of citric acid are added, fully stirred, and finally filtered and dried to obtain an active filler.

[0108] The mass fraction of the sodium silicate solution of the embodiment is 6.5%.

[0109] The pretreated nano titanium dioxide of the embodiment is prepared by sintering nano titanium dioxide and yttrium oxide at a weight ratio of 5:2 at 120 DEG C for 1h, and then cooling to room temperature.

[0110] The preparation method of the water permeable concrete reinforcing agent of the embodiment comprises the following steps: blending and ball-milling modified kaolin, water retaining agent, active filler and sodium lignosulfonate aqueous solution sufficiently, and then filtering and drying to obtain the water permeable concrete reinforcing agent.

[0111] The ball-milling speed of the blending and ball-milling of the embodiment is 1250r / min, and the ball-milling time is 2h.

[0112] Embodiment 4.

[0113] The water permeable concrete reinforcing agent of the embodiment is modified kaolin, hydroxyethyl cellulose, hydroxyethyl cellulose and sodium lignosulfonate aqueous solution, wherein the mass ratio of modified kaolin, water retaining agent, active filler and sodium lignosulfonate aqueous solution is 5:3:2:5.

[0114] The mass fraction of the sodium lignosulfonate aqueous solution of the embodiment is 6%.

[0115] The preparation method of the modified kaolin of the embodiment is as follows:

[0116] S01: stirring the kaolin in sufficient potassium permanganate solution, then washing with water, filtering and drying, and preheating the dried kaolin at 57 DEG C for 1h to obtain preheated kaolin;

[0117] S02: preparation of the modification liquid:

[0118] S02a: adding 1.5 parts of silane coupling agent KH550, 2 parts of 4% mass fraction urea solution and 4 parts of zeolite into 6 parts of lanthanum chloride solution, stirring uniformly to obtain a zeolite liquid;

[0119] S02b: adding 5 parts of sepiolite fiber and 2 parts of nano aluminum oxide into 6 parts of sodium citrate solution, stirring sufficiently to obtain a fiber liquid;

[0120] S02c: ultrasonic treatment of the fiber liquid and the zeolite liquid at a weight ratio of 3:5 to obtain a modification liquid;

[0121] S03: The preheated kaolin and the modification liquid are stirred and modified according to the weight ratio of 3:5. After the stirring is completed, the mixture is filtered and dried to obtain the modified kaolin.

[0122] The mass fraction of the potassium permanganate solution in this embodiment is 6%; and the mass fraction of the lanthanum chloride solution is 3%.

[0123] The ultrasonic power of the ultrasonic treatment in this embodiment is 360 W, and the ultrasonic treatment lasts for 20 min; the stirring speed of the stirring modification treatment is 570 r / min, and the stirring lasts for 1 h.

[0124] The preparation method of the active filler in this embodiment is as follows:

[0125] S101: Preparation of the nano-titanium dioxide liquid

[0126] 3 parts of the pretreated nano-titanium dioxide and 2 parts of the hydrotalcite are added into 6 parts of the sodium silicate solution and stirred uniformly to obtain the nano-titanium dioxide liquid.

[0127] S102: 4 parts of the volcanic rock and 2 parts of the nano-silica sol are added into 6 parts of the nano-titanium dioxide liquid, and then 3 parts of the citric acid is added, and the mixture is stirred fully. Finally, the mixture is filtered and dried to obtain the active filler.

[0128] The mass fraction of the sodium silicate solution in this embodiment is 6%.

[0129] The pretreated nano-titanium dioxide in this embodiment is prepared by mixing nano-titanium dioxide and yttrium oxide according to the weight ratio of 5:2, sintering at 115 ℃ for 1 h, and cooling to room temperature after the sintering is completed.

[0130] The preparation method of the pervious concrete reinforcing agent in this embodiment includes the following steps: the modified kaolin, the water-retaining agent, the active filler, and the sodium lignosulfonate aqueous solution are sufficiently blended and ball milled, and then the mixture is filtered and dried to obtain the pervious concrete reinforcing agent.

[0131] The ball milling speed of the sufficient ball milling in this embodiment is 1200 r / min, and the ball milling lasts for 2 h.

[0132] Embodiment 5.

[0133] The pervious concrete reinforcing agent in this embodiment is the modified kaolin, the hydroxyethyl cellulose, the active filler, and the sodium lignosulfonate aqueous solution, wherein the mass ratio of the modified kaolin, the hydroxyethyl cellulose, the active filler, and the sodium lignosulfonate aqueous solution is 6:3:4:5.

[0134] The mass fraction of the sodium lignosulfonate aqueous solution in this embodiment is 7%.

[0135] The preparation method of the modified kaolin in this embodiment is as follows:

[0136] S01: Stir the kaolin in a sufficient amount of potassium permanganate solution, then wash with water, filter, and dry. Preheat the dried kaolin at 58°C for 1h to obtain preheated kaolin;

[0137] S02: Preparation of the modification liquid:

[0138] S02a: Add 2 parts of silane coupling agent KH550, 3 parts of a 4% mass fraction urea solution, and 4 parts of zeolite to 7 parts of lanthanum chloride solution, and stir until uniform to obtain a zeolite liquid;

[0139] S02b: Add 6 parts of meerschaum fiber and 3 parts of nano-aluminum oxide to 7 parts of sodium citrate solution, and stir until uniform to obtain a fiber liquid;

[0140] S02c: Ultrasonically treat the fiber liquid and the zeolite liquid in a weight ratio of 3:5 to obtain a modification liquid;

[0141] S03: Stir and modify the preheated kaolin and the modification liquid in a weight ratio of 3:5. After stirring, filter and dry to obtain modified kaolin.

[0142] The mass fraction of the potassium permanganate solution in this example is 6%; the mass fraction of the lanthanum chloride solution is 3%.

[0143] The ultrasonic treatment in this example has an ultrasonic power of 360W and is performed for 20min; the stirring modification treatment has a stirring speed of 570r / min and is performed for 1h.

[0144] The preparation method of the active filler in this example is as follows:

[0145] S101, Preparation of the nano-titanium dioxide liquid:

[0146] Add 3 parts of pretreated nano-titanium dioxide and 2 parts of hydrotalcite to 7 parts of sodium silicate solution and stir until uniform to obtain a nano-titanium dioxide liquid;

[0147] S102: Add 4 parts of volcanic rock and 2 parts of nano-silica sol to 7 parts of the nano-titanium dioxide liquid, then add 3 parts of citric acid, stir until uniform, and finally filter and dry to obtain an active filler.

[0148] The mass fraction of the sodium silicate solution in this example is 7%.

[0149] The pretreated nano-titanium dioxide in this example is prepared by mixing nano-titanium dioxide and yttrium oxide in a weight ratio of 5:2, sintering at 125°C for 1h, and cooling to room temperature after sintering.

[0150] The preparation method of the pervious concrete reinforcing agent of the embodiment comprises the following steps: sufficiently blending and ball-milling a modified kaolin, a water-retaining agent, and an active filler and a sodium lignosulfonate aqueous solution, then filtering and drying to obtain the pervious concrete reinforcing agent.

[0151] The ball-milling rotation speed of the blending and ball-milling of the embodiment is 1450 r / min, and the ball-milling time is 2 h.

[0152] Comparative Example 1.

[0153] The difference between the embodiment 3 is that the modified kaolin is not added.

[0154] Comparative Example 2.

[0155] The difference between the embodiment 3 is that the modified liquid is not added in the preparation of the modified kaolin.

[0156] Comparative Example 3.

[0157] The difference between the embodiment 3 is that the fiber liquid is not added in the modified liquid.

[0158] Comparative Example 4.

[0159] The difference between the embodiment 3 is that the sepiolite fiber and nano-aluminum oxide are not added in the fiber liquid.

[0160] Comparative Example 5.

[0161] The difference between the embodiment 3 is that the zeolite liquid is not added in the modified liquid.

[0162] Comparative Example 6.

[0163] The difference between the embodiment 3 is that the urea solution and the zeolite are not added in the zeolite liquid.

[0164] Comparative Example 7.

[0165] The difference between the embodiment 3 is that the silane coupling agent KH550 is not added in the zeolite liquid, and the lanthanum chloride solution is replaced by water.

[0166] Comparative Example 8.

[0167] The difference between the embodiment 3 is that the active filler is not added.

[0168] Comparative Example 9.

[0169] The difference between the embodiment 3 is that the volcanic rock and nano-silica sol are not added in the active filler.

[0170] Comparative Example 10.

[0171] The difference between the embodiment 3 is that the nano-titanium dioxide liquid is not added in the active filler.

[0172] Comparative Example 11.

[0173] The difference between Example 3 is that the hydrotalcite and sodium silicate solution are not added in the nano-titanium dioxide solution.

[0174] Comparative Example 12.

[0175] The difference between Example 3 is that the pretreated nano-titanium dioxide is not added in the nano-titanium dioxide solution.

[0176] Comparative Example 13.

[0177] The difference between Example 3 is that the pretreated nano-titanium dioxide is replaced by nano-titanium dioxide.

[0178] The enhancer of Examples 1-5 and Comparative Examples 1-13 is applied in the concrete, wherein the formula of the pervious concrete is that the filler is ordinary Portland cement 42.5 (the amount is 320 kg / m 3 ), the aggregate is single particle level granite (the particle size is 2-5 mm, and the amount is 1500 kg / m 3 ), the water-cement ratio is 0.3, the aggregate-cement ratio is 4.0, and the amount of the enhancer is 1.5% of the weight of the cement. The water permeability, strength and wear resistance are tested, and the anti-freezing and weather-resistant stability of the product is tested (the product is placed at-5℃ for 24 h, and then irradiated under the ultraviolet intensity of 100 w / m 2 for 24 h).

[0179] The test method is as follows:

[0180] The water permeability test is tested according to the provisions of GJJ / T 135-2009 “Technical Specification for Pervious Cement Concrete Pavement”;

[0181] The compressive strength test is tested according to GB / T 50081-2002 “Standard for Testing Methods of Mechanical Properties of Ordinary Concrete”;

[0182] The wear resistance test is tested according to GB / T 12988-2009 “Test Method for Wear Resistance of Inorganic Ground Materials”.

[0183] The test results are as follows:

[0184]

[0185] From Examples 1-5 and Comparative Examples 1-13, it is concluded that the product of Example 3 has excellent water permeability, strength and wear resistance, and the performance of the product can be improved in a coordinated manner, and the anti-freezing and weather-resistant stability of the product is significantly improved.

[0186] Without adding the modified kaolin and the active filler in the product, the performance of the product is obviously deteriorated, and the performance of the product is most significant when the two are used in combination.

[0187] The performance of the product is deteriorated in different degrees when the modified liquid is not added in the preparation of the modified kaolin, the fiber liquid is not added in the modified liquid, the fibrous liquid is not added in the fibrous liquid, the nano alumina is not added in the fibrous liquid, the zeolite liquid is not added in the modified liquid, the urea solution and the zeolite are not added in the zeolite liquid, the silane coupling agent KH550 is not added in the zeolite liquid, and the lanthanum chloride solution is replaced by water, and the performance of the product is the most significant only when the modified kaolin is improved by the modified liquid prepared by the specific method of the application.

[0188] The performance of the product is the most significant when the modified liquid is prepared by the specific fiber liquid and the zeolite liquid.

[0189] The performance of the product is deteriorated in different degrees when the volcanic rock is not added in the active filler, the nano silicon sol is not added in the active filler, the nano titanium dioxide liquid is not added in the active filler, the hydrotalcite and the sodium silicate solution are not added in the nano titanium dioxide liquid, the pretreated nano titanium dioxide is not added in the nano titanium dioxide liquid, and the pretreated nano titanium dioxide is replaced by the nano titanium dioxide, and the performance of the product is the most significant when the active filler is prepared by the specific method of the application, and the performance of the product is the most significant when the nano titanium dioxide liquid is prepared by the specific method of the application, the hydrotalcite and the sodium silicate solution, and the like.

[0190] It is apparent for those skilled in the art that the present application is not limited to the details of the foregoing exemplary embodiments, and the present application can be implemented in other concrete forms without departing from the spirit or essential characteristics of the present application. Therefore, the embodiments should be considered in all respects as illustrative and not restrictive, the scope of the present application being defined by the appended claims rather than the foregoing description, and it is intended to embrace all changes and modifications that fall within the meaning and scope of equivalents of the claims.

[0191] In addition, it should be understood that although the present specification is described in terms of embodiments, not every embodiment contains only one independent technical solution, and the description of the specification is only for the sake of clarity, and those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can be combined appropriately to form other embodiments that those skilled in the art can understand.

Claims

1. A pervious concrete enhancer characterized by, The concrete reinforcing agent is modified kaolin, water-retaining agent and active filler and sodium lignosulfonate aqueous solution, wherein the mass ratio of the modified kaolin, water-retaining agent and active filler and sodium lignosulfonate aqueous solution is (4-7):3:(2-5):

5. The preparation method of the modified kaolin is as follows: S01: stirring the kaolin in sufficient potassium permanganate solution, then washing with water, filtering and drying, preheating the dried kaolin at 55-60°C for 1h to obtain preheated kaolin; S02: preparation of the modification liquid: S02a: adding 1-3 parts of silane coupling agent KH550, 2-4 parts of 4% mass fraction urea solution and 3-5 parts of zeolite to 5-8 parts of lanthanum chloride solution, stirring uniformly to obtain a zeolite liquid; S02b: adding 4-7 parts of sepiolite fiber and 2-4 parts of nano-alumina to 5-8 parts of sodium citrate solution, stirring sufficiently to obtain a fiber liquid; S02c: ultrasonic treatment of the fiber liquid and the zeolite liquid at a weight ratio of 3:5 to obtain a modification liquid; S03: stirring and modifying the preheated kaolin and the modification liquid at a weight ratio of 3:5, filtering and drying after stirring to obtain modified kaolin; The preparation method of the active filler is as follows: S101, preparation of nano-titania liquid: adding 2-4 parts of pretreated nano-titania and 2-3 parts of hydrotalcite to 5-8 parts of sodium silicate solution, stirring uniformly to obtain nano-titania liquid; S102: adding 3-5 parts of volcanic rock and 1-2 parts of nano-silica sol to 5-8 parts of nano-titania liquid, then adding 2-4 parts of citric acid, stirring sufficiently, and finally filtering and drying to obtain the active filler; The pretreated nano-titania is prepared by mixing nano-titania and yttrium oxide at a weight ratio of 5:2, sintering at 110-130°C for 1h, and cooling to room temperature after sintering.

2. The pervious concrete enhancer of claim 1, wherein, The mass fraction of the sodium lignosulfonate aqueous solution is 5-8%, and the water-retaining agent is hydroxyethyl cellulose.

3. The pervious concrete enhancer of claim 1, wherein, The mass fraction of the potassium permanganate solution is 5-8%, and the mass fraction of the lanthanum chloride solution is 2-5%.

4. The pervious concrete enhancer of claim 1, wherein, The ultrasonic power for ultrasonic treatment is 350-400W, and the ultrasonic treatment time is 20min; the stirring speed for stirring and modification is 550-650r / min, and the stirring time is 1h.

5. The pervious concrete enhancer of claim 1, wherein, The mass fraction of the sodium silicate solution is 5-8%.

6. The method for preparing the permeable concrete reinforcing agent according to any one of claims 1 to 5, characterized in that, The steps are as follows: blending and ball-milling the modified kaolin, water-retaining agent and active filler and sodium lignosulfonate aqueous solution sufficiently, then filtering and drying to obtain the water-permeable concrete reinforcing agent.

7. The method for preparing the permeable concrete reinforcing agent according to claim 6, characterized in that, The ball-milling speed for sufficient blending and ball-milling is 1000-1500r / min, and the ball-milling time is 2h.

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