Preparation method of high-performance pervious concrete and application thereof

Abstract

The application relates to a high-performance pervious concrete preparation method and application thereof, and belongs to the technical field of pervious concrete. The preparation method comprises the following steps: stirring coarse aggregate, fine aggregate, a filler, a retarder and cement, adding water and a water reducing agent during stirring, and mixing to obtain the high-performance pervious concrete; and the preparation of the filler comprises the following steps: soaking nano silicon dioxide in a sodium hydroxide aqueous solution, slowly adding zirconium oxychloride and stirring, standing, filtering, cleaning, vacuum drying, calcining, uniformly mixing in anhydrous ethanol, adding an amino compound and stirring, adding aromatic aldehyde and stirring at constant temperature, centrifuging, washing, vacuum drying, mixing modified glass fiber, polypropylene, styrene, glycidyl methacrylate and an initiator, and melt extruding to obtain the filler. The high-performance pervious concrete prepared by the application not only has high strength after forming, but also has excellent water permeability, excellent anti-impact and anti-erosion capacity.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of pervious concrete, and relates to a high-performance pervious concrete preparation method and application thereof. BACKGROUND

[0002] Pervious concrete is an ecological and environmentally friendly building material, which not only has excellent water permeability and air permeability, but also has high water storage capacity and attractive decorative effect. This material is particularly worth popularizing in the construction of "sponge cities". Pervious concrete not only meets the performance requirements of road use, but also coexists harmoniously with the natural environment, effectively improves the thermal balance of the ground, and promotes the circulation of surface water. It has significant importance for increasing urban groundwater resources, alleviating urban heat island effect, and improving urban climate.

[0003] Generally, pervious concrete is composed of cementitious materials, coarse aggregates, water and admixtures. Due to the absence of fine aggregates, a high void ratio is formed in the concrete structure, which allows water to penetrate smoothly. However, due to the limitations of material composition and preparation process, traditional pervious concrete often has poor workability, uneven pore distribution, insufficient strength and freeze-thaw resistance, is prone to freeze-thaw damage, has low water permeability coefficient, limited environmental performance, and cannot meet the standards of laying high-performance pavement and the demand for seasonal drainage of rainwater, which limits the application and popularization of pervious concrete products. In addition, there are some problems in the actual engineering application of pervious concrete on the market, such as insufficient bearing capacity, weak bonding force between coarse aggregates, low water permeability coefficient, low freeze-thaw resistance and strength, easy cracking and difficult repair, and air hole blockage, which all shorten its service life and further limit the development potential of pervious concrete. SUMMARY

[0004] The purpose of the present application is to provide a high-performance pervious concrete preparation method and application thereof. The high-performance pervious concrete provided by the present application not only has high strength after molding, but also exhibits excellent water permeability, excellent anti-impact and anti-erosion capacity.

[0005] The purpose of the present application can be achieved by the following technical solutions:

[0006] A high-performance pervious concrete preparation method comprises stirring coarse aggregate, fine aggregate, filler, retarder and cement, and adding water and water reducing agent under stirring to mix.

[0007] As a preferred technical scheme of the present application, the high-performance pervious concrete comprises the following components in parts by weight: coarse aggregate 200-240 parts, fine aggregate 50-58 parts, water reducing agent 1-2 parts, filler 20-30 parts, retarder 0.2-0.3 parts, cement 90-100 parts, and water 40-50 parts; the water reducing agent is at least one of polycarboxylic acid water reducing agent, naphthalene water reducing agent, aliphatic water reducing agent, melamine water reducing agent, and aminosulfonate water reducing agent; and the retarder is at least one of citric acid, sodium citrate, carboxymethyl cellulose, gluconic acid, sodium pyrophosphate, salicylic acid, and tartaric acid.

[0008] As a preferred technical scheme of the present application, the preparation method of the filler comprises the following steps:

[0009] 1) soaking nano-silicon dioxide in a sodium hydroxide aqueous solution, slowly adding zirconium oxychloride, stirring, standing, filtering to obtain a solid, washing to neutral, vacuum drying, and calcining to obtain a composite particle;

[0010] 2) mixing the composite particle in anhydrous ethanol, adding an amino compound, stirring and mixing, adding an aromatic aldehyde, constant-temperature stirring, centrifuging, washing, and vacuum drying to a constant weight to obtain a modified composite particle;

[0011] 3) mixing and melting the modified composite particle, modified glass fiber, polypropylene, styrene, glycidyl methacrylate, and an initiator, and melt-extruding to obtain the filler.

[0012] In step 1), the soaking time is 40-50 min, the stirring time is 50-60 min, the standing time is 1-2 h, the vacuum drying temperature is 80℃, and the calcining is calcining at 560-600℃ for 2-3 h.

[0013] In step 1), the concentration of the sodium hydroxide aqueous solution is 30wt%, and the mass ratio of the nano-silicon dioxide, the sodium hydroxide aqueous solution, and the zirconium oxychloride is 10-12:40-50:2.4-3.0.

[0014] As a preferred technical scheme of the present application, in step 2), the stirring and mixing is stirring at a temperature of 30-40℃ for 30-40 min, the constant-temperature stirring is stirring at a temperature of 60-70℃ and a rotation speed of 600-700 r / min for 5-6 h, the washing is washing three times with anhydrous ethanol, and the vacuum drying temperature is 80℃.

[0015] As a preferred technical scheme of the present application, in step 2), the mass ratio of the composite particles, anhydrous ethanol, the amino compound and the aromatic aldehyde is 8-10:40-50:1.2-1.4:1.8-2.3; the amino compound is 2-amino terephthalic acid; and the aromatic aldehyde is 3-(4-hydroxyphenyl) propenal.

[0016] As a preferred technical scheme of the present application, in step 3), the temperature of the melt extrusion is 200-220℃; and the initiator is azobisisobutyronitrile.

[0017] As a preferred technical scheme of the present application, in step 3), the mass ratio of the modified composite particles, the modified glass fiber, polypropylene, styrene, glycidyl methacrylate and the initiator is 4-5:0.8-1.2:7.2-8.0:0.6-0.8:1.2-1.6:0.05-0.06.

[0018] As a preferred technical scheme of the present application, the modified glass fiber is a vinyl silane coupling agent modified glass fiber; the vinyl silane coupling agent is KH-570; and the preparation of the modified glass fiber is mixing anhydrous ethanol, glass fiber and vinyl silane coupling agent at a mass ratio of 1:6:0.2, stirring at 60℃ for 4h, and then filtering, drying and obtaining.

[0019] The present application discloses an application of the high-performance water-permeable concrete prepared by the preparation method in a road surface.

[0020] The present application has the following beneficial effects:

[0021] (1) The high-performance water-permeable concrete provided by the present application not only has high strength after molding, but also has excellent water permeability and outstanding resistance to impact and abrasion.

[0022] (2) The preparation process of the high-performance water-permeable concrete is simple, and the performance is excellent, so the present application is very suitable for wide promotion and application. DETAILED DESCRIPTION

[0023] In order to further illustrate the technical means and effects adopted by the present application to achieve the predetermined application purposes, the specific embodiments, structures, features and effects according to the present application are described in detail as follows in combination with examples.

[0024] Example 1

[0025] The high-performance water-permeable concrete comprises the following components in parts by weight: coarse aggregate 200 parts, fine aggregate 50 parts, water reducing agent 1 part, filling agent 20 parts, retarder 0.2 part, cement 90 parts and water 40 parts; the water reducing agent is a polycarboxylic acid water reducing agent; and the retarder is citric acid.

[0026] The preparation method of the filler comprises the following steps:

[0027] 1) The nanosilica is soaked in a sodium hydroxide aqueous solution for 40 min, then zirconium oxychloride is slowly added and stirred for 50 min, and then left to stand for 1 h. The solid is filtered, washed to neutral, dried at 80℃ under vacuum, and then calcined at 560℃ for 2 h to obtain the composite particles. The concentration of the sodium hydroxide aqueous solution is 30wt%; the mass ratio of the nanosilica, the sodium hydroxide aqueous solution and the zirconium oxychloride is 10:40:2.4;

[0028] 2) The composite particles are mixed in anhydrous ethanol, then an amino compound is added and stirred at 30℃ for 30 min, then an aromatic aldehyde is added and stirred at 60℃ at a speed of 600 r / min for 5 h. After centrifugation, the product is washed with anhydrous ethanol three times, and then dried at 80℃ under vacuum to constant weight to obtain the modified composite particles. The mass ratio of the composite particles, the anhydrous ethanol, the amino compound and the aromatic aldehyde is 8:40:1.2:1.8; the amino compound is 2-amino terephthalic acid; and the aromatic aldehyde is 3-(4-hydroxyphenyl) propenal;

[0029] 3) The modified composite particles, modified glass fiber, polypropylene, styrene, glycidyl methacrylate and initiator are mixed and melt-extruded at 200℃ to obtain the filler. The initiator is azobisisobutyronitrile; and the mass ratio of the modified composite particles, the modified glass fiber, the polypropylene, the styrene, the glycidyl methacrylate and the initiator is 4:0.8:7.2:0.6:1.2:0.05.

[0030] The modified glass fiber is prepared by mixing anhydrous ethanol, glass fiber and vinyl silane coupling agent at a mass ratio of 1:6:0.2, stirring at 60℃ for 4 h, and then filtering and drying.

[0031] A preparation method of high-performance pervious concrete comprises stirring coarse aggregate, fine aggregate, filler, retarder and cement, and then adding water and water reducing agent under stirring to obtain the high-performance pervious concrete.

[0032] Example 2

[0033] The high-performance pervious concrete comprises the following components in parts by weight: coarse aggregate 213 parts, fine aggregate 53 parts, water reducing agent 1.3 parts, filler 23 parts, retarder 0.23 parts, cement 93 parts and water 43 parts; the water reducing agent is polycarboxylic acid water reducing agent; and the retarder is citric acid.

[0034] The preparation method of the filler comprises the following steps:

[0035] 1) The nanometer silicon dioxide is soaked in a sodium hydroxide aqueous solution for 45 min, and then zirconium oxychloride is slowly added and stirred for 53 min. After standing for 1.5 h, the solid is filtered, washed to neutral, vacuum dried at 80℃, and calcined at 570℃ for 2.5 h to obtain the composite particles. The concentration of the sodium hydroxide aqueous solution is 30 wt%; the mass ratio of the nanometer silicon dioxide, the sodium hydroxide aqueous solution, and the zirconium oxychloride is 10.7:43:2.6.

[0036] 2) The composite particles are mixed in anhydrous ethanol, and then an amino compound is added and stirred at 33℃ for 33 min. After adding an aromatic aldehyde and stirring at 63℃ at a speed of 630 r / min for 5.5 h, centrifugation is performed, and the product is washed with anhydrous ethanol three times, vacuum dried at 80℃ to constant weight, and then the modified composite particles are obtained. The mass ratio of the composite particles, the anhydrous ethanol, the amino compound, and the aromatic aldehyde is 8.7:43:1.3:2. The amino compound is 2-amino terephthalic acid, and the aromatic aldehyde is 3-(4-hydroxyphenyl) propenal.

[0037] 3) The modified composite particles, modified glass fiber, polypropylene, styrene, glycidyl methacrylate, and initiator are mixed and melt extruded at 207℃ to obtain the filler. The initiator is azobis isobutyronitrile. The mass ratio of the modified composite particles, the modified glass fiber, the polypropylene, the styrene, the glycidyl methacrylate, and the initiator is 4.3:0.9:7.5:0.67:1.3:0.053.

[0038] The modified glass fiber is prepared by mixing anhydrous ethanol, glass fiber, and vinyl silane coupling agent at a mass ratio of 1:6:0.2, stirring at 60℃ for 4 h, and then filtering and drying.

[0039] A high-performance pervious concrete preparation method includes stirring coarse aggregate, fine aggregate, filler, retarder, and cement, and then adding water and water reducing agent under stirring to obtain the high-performance pervious concrete.

[0040] Example 3

[0041] The high-performance pervious concrete includes the following components by weight fraction: coarse aggregate 227 parts, fine aggregate 55 parts, water reducing agent 1.7 parts, filler 27 parts, retarder 0.27 parts, cement 97 parts, and water 47 parts. The water reducing agent is a polycarboxylic acid water reducing agent, and the retarder is citric acid.

[0042] The preparation method of the filler includes the following steps:

[0043] 1) The nanosilica is soaked in a sodium hydroxide aqueous solution for 45 min, and then zirconium oxychloride is slowly added and stirred for 55 min. After standing for 1.5 h, the solid is filtered, washed to neutral, vacuum dried at 80℃, and calcined at 580℃ for 2.7 h to obtain the composite particles. The concentration of the sodium hydroxide aqueous solution is 30 wt%; the mass ratio of the nanosilica, the sodium hydroxide aqueous solution, and the zirconium oxychloride is 11.3:47:2.8.

[0044] 2) The composite particles are mixed in anhydrous ethanol, and then an amino compound is added and stirred at 37℃ for 35 min. After stirring at 65℃ for 5.5 h at a speed of 660 r / min, the product is centrifuged, washed with anhydrous ethanol three times, and vacuum dried at 80℃ to constant weight to obtain the modified composite particles. The mass ratio of the composite particles, the anhydrous ethanol, the amino compound, and the aromatic aldehyde is 9.3:47:1.3:2.1. The amino compound is 2-amino terephthalic acid, and the aromatic aldehyde is 3-(4-hydroxyphenyl) propenal.

[0045] 3) The modified composite particles, modified glass fibers, polypropylene, styrene, glycidyl methacrylate, and an initiator are mixed and melt-extruded at 215℃ to obtain the filler. The initiator is azobisisobutyronitrile. The mass ratio of the modified composite particles, the modified glass fibers, the polypropylene, the styrene, the glycidyl methacrylate, and the initiator is 4.7:1.1:7.7:0.73:1.5:0.057.

[0046] The modified glass fibers are prepared by mixing anhydrous ethanol, glass fibers, and a vinyl silane coupling agent at a mass ratio of 1:6:0.2, stirring at 60℃ for 4 h, and then filtering and drying.

[0047] A method for preparing high-performance pervious concrete includes stirring coarse aggregate, fine aggregate, filler, retarder, and cement, and then adding water and water reducing agent under stirring to obtain the high-performance pervious concrete.

[0048] Example 4

[0049] The high-performance pervious concrete includes the following components by weight fraction: coarse aggregate 240 parts, fine aggregate 58 parts, water reducing agent 2 parts, filler 30 parts, retarder 0.3 parts, cement 100 parts, and water 50 parts. The water reducing agent is a polycarboxylic acid water reducing agent, and the retarder is citric acid.

[0050] The method for preparing the filler includes the following steps:

[0051] 1) The nano-silica is soaked in a sodium hydroxide aqueous solution for 50 min, and then zirconium oxychloride is slowly added and stirred for 60 min. After standing for 2 h, the solid is filtered and washed to neutral. After drying under vacuum at 80℃, the product is calcined at 600℃ for 3 h to obtain the composite particles. The concentration of the sodium hydroxide aqueous solution is 30 wt%. The mass ratio of the nano-silica, the sodium hydroxide aqueous solution, and the zirconium oxychloride is 12:50:3.0.

[0052] 2) The composite particles are mixed in anhydrous ethanol, and then an amino compound is added and stirred at 40℃ for 40 min. After stirring at 70℃ for 6 h at a speed of 700 r / min, the product is centrifuged and washed with anhydrous ethanol three times. After drying under vacuum at 80℃ to a constant weight, the modified composite particles are obtained. The mass ratio of the composite particles, the anhydrous ethanol, the amino compound, and the aromatic aldehyde is 10:50:1.4:2.3. The amino compound is 2-amino terephthalic acid. The aromatic aldehyde is 3-(4-hydroxyphenyl) propenal.

[0053] 3) The modified composite particles, modified glass fiber, polypropylene, styrene, glycidyl methacrylate, and initiator are mixed and melt-extruded at 220℃ to obtain the filler. The initiator is azobis isobutyronitrile. The mass ratio of the modified composite particles, modified glass fiber, polypropylene, styrene, glycidyl methacrylate, and initiator is 5:1.2:8.0:0.8:1.6:0.06.

[0054] The modified glass fiber is prepared by mixing anhydrous ethanol, glass fiber, and vinyl silane coupling agent at a mass ratio of 1:6:0.2, stirring at 60℃ for 4 h, and then filtering and drying.

[0055] A method for preparing high-performance pervious concrete includes mixing coarse aggregate, fine aggregate, filler, retarder, and cement, and then adding water and water reducing agent under stirring to obtain the product.

[0056] Comparative Example 1

[0057] Comparative Example 1 is different from Example 3 in that zirconium oxychloride is not used, and the other components, preparation steps, and parameters are the same.

[0058] Comparative Example 2

[0059] Comparative Example 2 is different from Example 3 in that aniline is used instead of the amino compound in step 2), and the other components, preparation steps, and parameters are the same.

[0060] Comparative Example 3

[0061] Comparative Example 3 differs from Example 3 in that no amino compound is used, and the other components, preparation steps and parameters are consistent.

[0062] Comparative Example 4

[0063] Comparative Example 4 differs from Example 3 in that p-hydroxybenzaldehyde is used instead of aromatic aldehyde in step 2), and the other components, preparation steps and parameters are consistent.

[0064] Comparative Example 5

[0065] Comparative Example 5 differs from Example 3 in that no aromatic aldehyde is used, and the other components, preparation steps and parameters are consistent.

[0066] Comparative Example 6

[0067] Comparative Example 6 differs from Example 3 in that no modification is made to the glass fiber, and the other components, preparation steps and parameters are consistent.

[0068] Comparative Example 7

[0069] Comparative Example 7 differs from Example 3 in that no glycidyl methacrylate is used, and the other components, preparation steps and parameters are consistent.

[0070] The concrete prepared in Examples 1-4 and Comparative Examples 1-7 is respectively subjected to the following performance tests, and the test results are shown in Table 1.

[0071] Compressive strength test: according to GB / T50081-2002, the 28d compressive strength of the concrete is detected;

[0072] Permeability coefficient test: according to GB / T25993-2010;

[0073] Table 1

[0074] Permeability coefficient (mm / s) Compressive strength (MPa) Example 1 11.7 48.1 Example 2 12.1 48.8 Example 3 11.5 47.6 Example 4 11.8 48.3 Comparative Example 1 8.7 32.5 Comparative Example 2 9.3 33.8 Comparative Example 3 8.2 30.5 Comparative Example 4 9.5 34.4 Comparative Example 5 8.1 30.2 Comparative Example 6 8.9 32.8 Comparative Example 7 8.3 31.0

[0075] From the test results in Table 1, it can be seen that the concrete prepared in Examples 1-4 has excellent water permeability and compressive strength compared with Comparative Examples 1-7.

[0076] Compared with all the examples and comparative examples, it can be known from the analysis of Table 1 that the polypropylene has a good connecting effect on the concrete aggregate, and can promote the improvement of the compressive strength and the flexural strength of the concrete; the water permeability and the compressive strength of the concrete can be effectively improved by adding the modified composite particles and the modified glass fiber in the polypropylene material. Specifically, by generating zirconium oxide on the surface of nano-silicon dioxide and forming composite particles, the zirconium oxide is a common wear-resistant and high-strength inorganic filler, by compounding it with silicon dioxide, the compressive strength of the water permeable concrete is improved due to the size effect of the nano-particles, so that the water permeable concrete is not easy to crack, and the compounded composite particles also have filtering capacity, thereby enhancing the water permeability of the water permeable concrete.

[0077] The 3-(4-hydroxyphenyl) acrolein and 2-amino terephthalic acid with antioxidant property are combined to form a chemical chain, the molecular chain contains phenolic hydroxyl and multiple carboxyl groups, the antioxidant property is improved, the free radicals can be effectively captured, and a compound with higher thermal stability is formed, the damage of the free radicals to the polypropylene material under light and heat is reduced, thereby ensuring the strength performance of the concrete; the composite particles modified by the amino compound and the aromatic aldehyde can be uniformly dispersed in the polypropylene material, the addition of the glycidyl methacrylate can react with the active hydroxyl and carboxyl groups of the modified composite particles and the modified glass fiber, and further promote the compatibility of the modified composite particles and the modified glass fiber in the polypropylene material, and the carbon-carbon double bonds contained in the modified composite particles and the modified glass fiber can also participate in the copolymerization reaction in the system, so that the bonding force of the modified composite particles and the modified glass fiber is improved, and by increasing the dispersity and the bonding force, the compressive strength and the water permeability of the water permeable concrete are enhanced.

[0078] The above is only a preferred embodiment of the present application, and does not limit the present application in any form, although the present application has been disclosed as above, however, it is not intended to limit the present application, any person skilled in the art, without departing from the technical solution of the present application, can make some changes or modifications to the equivalent embodiments, as long as it does not deviate from the technical solution of the present application, any modification, equivalent change and modification of the above embodiments according to the technical essence of the present application, all still belong to the scope of the technical solution of the present application.

Claims

1. A method for preparing high performance pervious concrete, characterized by, The preparation method comprises the following steps: 1) soaking nano-silica in sodium hydroxide aqueous solution, slowly adding zirconium oxychloride, stirring, standing, filtering to obtain solid, washing to neutral, vacuum drying, and calcining to obtain composite particles; 2) mixing the composite particles in anhydrous ethanol, adding an amino compound, stirring, adding an aldehyde compound, constant temperature stirring, centrifuging, washing, vacuum drying to constant weight, and obtaining modified composite particles; 3) mixing the modified composite particles, modified glass fiber, polypropylene, styrene, glycidyl methacrylate and initiator, and melt extruding to obtain the filler. The amino compound is 2-amino terephthalic acid; the aldehyde compound is 3-(4-hydroxyphenyl) acrolein; the modified glass fiber is vinyl silane coupling agent modified glass fiber; the vinyl silane coupling agent is KH-570; and the preparation of the modified glass fiber comprises the following steps: mixing anhydrous ethanol, glass fiber and vinyl silane coupling agent at a mass ratio of 1:6:0.2, stirring at 60 DEG C for 4h, filtering and drying. The high-performance water-permeable concrete comprises the following components in parts by weight: coarse aggregate 200-240 parts, fine aggregate 50-58 parts, water reducing agent 1-2 parts, filler 20-30 parts, retarder 0.2-0.3 parts, cement 90-100 parts and water 40-50 parts. In step 1), the soaking time is 40-50 min; the stirring time is 50-60 min; the standing time is 1-2h; the vacuum drying temperature is 80 DEG C; and the calcining is carried out at 560-600 DEG C for 2-3h.

2. The method of claim 1, wherein the high performance pervious concrete is prepared by mixing the cement, the fine aggregate, the coarse aggregate, the water, the air-entraining agent, the water-reducing agent, the superplasticizer, the fiber, and the additive. In step 1), the concentration of the sodium hydroxide aqueous solution is 30wt%; and the mass ratio of the nano-silica, the sodium hydroxide aqueous solution and the zirconium oxychloride is 10-12:40-50:2.4-3.

0.

3. The method of claim 1, wherein the high performance pervious concrete is prepared by mixing the cement, the fine aggregate, the coarse aggregate, the water, the air-entraining agent, the water-reducing agent, the superplasticizer, the fiber, and the additive. In step 2), the stirring and mixing is carried out at 30-40 DEG C for 30-40 min; the constant temperature stirring is carried out at 600-700r / min for 5-6h at 60-70 DEG C; the washing is carried out with anhydrous ethanol for three times; and the vacuum drying temperature is 80 DEG C.

4. The method for preparing high-performance permeable concrete according to claim 1, characterized in that: In step 2), the mass ratio of the composite particles, the anhydrous ethanol, the amino compound and the aldehyde compound is 8-10:40-50:1.2-1.4:1.8-2.

3.

5. The method for preparing high-performance permeable concrete according to claim 1, characterized in that: In step 3), the melt extruding temperature is 200-220 DEG C; the initiator is azobisisobutyronitrile; and the mass ratio of the modified composite particles, the modified glass fiber, the polypropylene, the styrene, the glycidyl methacrylate and the initiator is 4-5:0.8-1.2:7.2-8.0:0.6-0.8:1.2-1.6:0.05-0.

06.

6. The method for preparing high-performance permeable concrete according to claim 1, characterized in that: ​ 7. The method for preparing high-performance permeable concrete according to claim 1, characterized in that: ​ 8. Use of high performance pervious concrete prepared according to the method of any one of claims 1 to 7 in pavements.