CN116217124B - Permeable concrete durability permeable reinforcing agent and preparation method thereof - Google Patents

Permeable concrete durability permeable reinforcing agent and preparation method thereof Download PDF

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CN116217124B
CN116217124B CN202310491242.4A CN202310491242A CN116217124B CN 116217124 B CN116217124 B CN 116217124B CN 202310491242 A CN202310491242 A CN 202310491242A CN 116217124 B CN116217124 B CN 116217124B
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water
parts
permeable
agent
silica fume
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CN116217124A (en
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石俊清
徐元荣
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Hohhot Juri Special Chemical Building Materials Co ltd
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    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
    • C04B40/0028—Aspects relating to the mixing step of the mortar preparation
    • C04B40/0039—Premixtures of ingredients
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
    • C04B28/04—Portland cements
    • 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
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/91—Use of waste materials as fillers for mortars or concrete

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Inorganic Chemistry (AREA)
  • Road Paving Structures (AREA)

Abstract

The invention belongs to the technical field of concrete additives, and discloses a permeable concrete durability permeable reinforcing agent and a preparation method thereof, wherein the permeable concrete durability permeable reinforcing agent comprises the following components in parts by weight: 5.5-6.5 parts of water reducer, 18-22 parts of binder, 56-64 parts of reinforcing component, 0.8-1.2 parts of water retention thickener, 3.5-4.5 parts of waterproof agent and 8-12 parts of water repellent agent, wherein the reinforcing component is silica fume, 38-42 parts of semi-encrypted silica fume and 18-22 parts of unencrypted silica fume are adopted, when the water permeable reinforcing agent is adopted to prepare high-strength water permeable concrete, the water permeable concrete with the pressure of 20-45 MPa can be prepared without any special equipment, and the water permeable concrete has high strength, good durability, good freezing resistance and rainwater erosion resistance, can bear various severe environments, and prolongs the service life of water permeable concrete pavement.

Description

Permeable concrete durability permeable reinforcing agent and preparation method thereof
Technical Field
The invention belongs to the technical field of concrete additives, and particularly relates to a permeable reinforcing agent for permeable concrete durability and a preparation method thereof.
Background
Along with the rising of the construction of the sponge city, the pervious concrete prepared from the pervious concrete admixture has good compressive strength and good water permeability, so that the environment-friendly and livability concept of the city is well solved, the function of the urban ecological system is improved, and the occurrence of flood disasters of the city is reduced. Therefore, the state advocates and develops the sponge city, the permeable concrete can enable rainwater to normally permeate underground, and the permeable concrete can not obstruct the atmosphere evaporation circulation, is favorable for slowing down the heat island effect of the city, reduces the rainwater loss, and accords with the characteristics of the sponge city.
In the aspect of the prior art, the prior pervious concrete still has some problems, 1. The pervious concrete is easy to generate slurry under the condition of not adopting special additives. The adhesion force among the stone particles is not strong, and the anti-stripping capability of the surface stones is poor. 2. The pervious concrete cannot improve the strength and the adhesive property of the pervious concrete by fully increasing the cement consumption, and the reason is that the strength improvement amplitude is small and the water permeability coefficient is obviously reduced when the cement consumption is increased. 3. The pervious concrete has the advantages that when rainwater falls to the ground, the rainwater can quickly enter a drainage system through a drainage pavement or is stored below the ground, so that the pervious concrete can be in running water contact for a long time, erodes and even is eroded by acid rain, the water permeability coefficient of the maximum precipitation of the reserved year is removed due to the design of the proportion of the pervious concrete, the residual pervious concrete stone particles have limited bonding area, and the pervious concrete is in freeze thawing circulation for a long time in northern areas with lower air temperature.
The strength and the service life of the pervious concrete are directly affected by the problems, so how to solve the technical problems is a research direction of the field and the technicians.
Disclosure of Invention
In order to solve the defects in the background art, the invention aims to provide a permeable concrete durability permeable reinforcing agent and a preparation method thereof, and aims to improve the mechanical strength, rainwater erosion resistance, freeze-thawing cycle resistance and service life of permeable concrete and reduce the use and maintenance cost.
The aim of the invention can be achieved by the following technical scheme:
the permeable concrete durability permeable reinforcing agent comprises the following components in parts by weight:
5.5-6.5 parts of water reducer,
18-22 parts of a bonding agent,
56-64 parts of reinforcing component,
0.8-1.2 parts of water retention thickener,
3.5-4.5 parts of waterproof agent,
8-12 parts of a hydrophobic agent;
the reinforcing component is silica fume, wherein 38-42 parts of the silica fume are semi-encrypted, and 18-22 parts of the silica fume are unencrypted.
Further preferably, the water reducing agent is a polycarboxylate water reducing agent or sulfamate water reducing agent.
Further preferably, the binder is mixed by powder polyvinyl alcohol and emulsion latex according to a mass ratio of 1:2, and the emulsion latex is styrene-acrylic emulsion latex powder or acrylic ester latex powder.
Further preferably, the bulk density of the semi-encrypted silica fume is 450kg/m, the bulk density of the unencrypted silica fume is 180-250 kg/m, the mass percentage of the active silica in the silica fume is more than or equal to 90%, and the specific surface area is 18000-22000 m 2 The water demand ratio per kg is not more than 110%, and 28d activity>115%。
Further preferably, the water-retaining thickener is one or more of hydroxypropyl methylcellulose, hydroxyethyl cellulose and hydroxymethyl cellulose, and the viscosity of cellulose ether of the water-retaining thickener is 100-1000 mPa.S.
Further preferably, the waterproofing agent is one of fatty acid salt, aluminum distearate or calcium stearate.
Further preferably, the hydrophobic agent is one or more of siloxane, octyl triethyl silane, isooctyl triethoxy silane, decyl triethoxy silane, dodecyl triethoxy silane, hexadecyl triethoxy silane and perfluoro ethyl triethoxy silane.
The preparation method of the permeable concrete durability permeable reinforcing agent comprises the following steps:
s1, adding a water reducing agent, an adhesive, a water-retaining thickener, a waterproof agent and a water repellent agent into a mixing barrel of anti-sticking mixing equipment, driving the mixing barrel to rotate through a first motor, controlling the rotation speed of the mixing barrel to be 5-10 r/min, rotating an adjusting rotary table to enable an elastic scraping strip to be attached to the inner wall of the mixing barrel, driving a stirring shaft and stirring blades to rotate through a third motor, controlling stirring She Zhuaisu to 80r/min, and mixing the stirring blades and the mixing barrel to rotate in opposite directions for 5-10 min;
s2, controlling the rotation speed of the mixing drum and the stirring blades to be unchanged, adding unencrypted silica fume into the mixing drum, driving the stirring shaft and the stirring blades to move in an annular mode in a vertical plane through a second motor, so that materials are turned up and down, stirring and mixing for 10-20 min, continuously adding semi-encrypted silica fume, and continuously stirring for 15-30 min;
s3, after materials are uniformly mixed, the permeable concrete durability permeable reinforcing agent is obtained, the second motor and the third motor are closed, a valve inside the discharging pipe is opened for discharging, clear water is introduced into the scraper blade through the water pump after discharging is completed, and clear water is sprayed out through the elastic scraping strip to clean the inner wall of the mixing barrel.
The invention has the beneficial effects that:
the permeable concrete of the invention is doped with a small amount (3-5% of the total mass of the cementing material) of the permeable reinforcing agent, so that the bonding area between coarse aggregates in the permeable concrete can be enlarged, the bonding force between the coarse aggregates can be increased, the viscosity of cement paste can be increased, the bonding force between the coarse aggregates can be increased, and the bonding strength can be improved, thereby increasing the mechanism and implementation method of the permeable concrete strength. The contradiction between the water permeability coefficient and the strength of the macroporous water permeable concrete is solved in principle. The durability water-permeable reinforcing agent disclosed by the invention is used for producing water-permeable concrete, so that the water permeability of the concrete is ensured, the defect of low strength of the traditional macroporous water-permeable concrete is overcome, and the simplicity of site construction and quality control of the mixing proportion design of the water-permeable concrete are facilitated. When the water permeable reinforcing agent is adopted to prepare high-strength water permeable concrete, the water permeable concrete with the strength of 20-45 MPa can be prepared without any special equipment, and the water permeable concrete has the advantages of high strength, good durability, good freezing resistance and rainwater erosion resistance, can bear various severe environments, and prolongs the service life of a water permeable concrete pavement.
According to the invention, the water-retaining thickening agent with strong hygroscopicity and the like are present in the raw materials of the permeable concrete durable permeable reinforcing agent, so that anti-sticking mixing equipment is adopted in the preparation method, the mixing barrel and the mixing blade are driven to move in an annular manner in a vertical plane by combining with the second motor, no dead angle stirring of materials is realized, the mixing effect is improved, meanwhile, the elastic scraping strip on one side of the scraping plate is always attached to the inner wall of the mixing barrel through the telescopic component, the materials hanging on the wall in the stirring and mixing process can be cleaned, the materials are prevented from being adhered, meanwhile, the water spraying port on the elastic scraping strip can spray clear water, and the mixing equipment is cleaned at the discharging port.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described, and it will be obvious to those skilled in the art that other drawings can be obtained according to these drawings without inventive effort.
FIG. 1 is a schematic diagram of the overall structure of the water penetration enhancer anti-sticking mixing apparatus of the present invention;
FIG. 2 is a schematic cross-sectional structural view of the water penetration enhancer anti-sticking mixing apparatus of the present invention;
FIG. 3 is a schematic cross-sectional structural view of a cleaning mechanism of the anti-sticking mixing device for water penetration enhancers of the present invention.
In the figure: the device comprises a 1-outer cylinder, a 2-mixing drum, a 3-discharging pipe, a 4-worm wheel, a 5-worm, a 6-first motor, a 7-stirring mechanism, an 8-cleaning mechanism, a 9-first mounting seat, a 10-supporting rod, an 11-first driving wheel, a 12-second driving wheel, a 13-second motor, a 14-cross rod, a 15-stirring shaft, a 16-third motor, a 17-stirring blade, a 18-second mounting seat, a 19-telescopic component, a 20-sleeve, a 21-screw, a 22-adjusting turntable, a 23-connecting rod, a 24-scraping plate, a 25-limiting block, a 26-spring, a 27-elastic scraping strip, a 28-water spraying opening, a 29-water inlet pipe, a 30-sliding hole and a 31-water inlet.
Detailed Description
The technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention provides a permeable concrete durability permeable reinforcing agent, which comprises the following components in parts by weight: 5.5-6.5 parts of water reducer, 18-22 parts of binder, 56-64 parts of reinforcing component, 0.8-1.2 parts of water retention thickener, 3.5-4.5 parts of waterproof agent and 8-12 parts of hydrophobing agent; the reinforcing component is silica fume, wherein 38-42 parts of the silica fume are semi-encrypted, and 18-22 parts of the silica fume are unencrypted.
The water reducer is a polycarboxylate water reducer or sulfamate water reducer.
The adhesive comprises the components of powder polyvinyl alcohol and emulsion latex according to the mass ratio of 1:2, wherein the emulsion latex is styrene-acrylic emulsion latex powder or acrylic ester latex powder.
The bulk density of the semi-encrypted silica fume is 450kg/m, the bulk density of the unencrypted silica fume is 180-250 kg/m, the mass percentage of the active silica in the silica fume is more than or equal to 90%, and the specific surface area is 18000-22000 m 2 Ratio of water demand per kgNo more than 110%,28d activity>115%。
The water-retaining thickener is one or more of hydroxypropyl methyl cellulose, hydroxyethyl cellulose and hydroxymethyl cellulose, and the viscosity of cellulose ether of the water-retaining thickener is 100-1000 mPa.S.
The waterproof agent is one of fatty acid salt, aluminum distearate or calcium stearate.
The hydrophobic agent is one or more of siloxane, octyl triethyl silane, isooctyl triethoxy silane, decyl triethoxy silane, dodecyl triethoxy silane, hexadecyl triethoxy silane and perfluoro ethyl triethoxy silane.
The preparation method of the permeable concrete durability permeable reinforcing agent comprises the following steps:
s1, adding a water reducing agent, an adhesive, a water-retaining thickener, a waterproof agent and a water repellent agent into a mixing barrel of anti-sticking mixing equipment, driving the mixing barrel to rotate through a first motor, controlling the rotation speed of the mixing barrel to be 5-10 r/min, rotating an adjusting rotary table to enable an elastic scraping strip to be attached to the inner wall of the mixing barrel, driving a stirring shaft and stirring blades to rotate through a third motor, controlling stirring She Zhuaisu to 80r/min, and mixing the stirring blades and the mixing barrel to rotate in opposite directions for 5-10 min;
s2, controlling the rotation speed of the mixing drum and the stirring blades to be unchanged, adding unencrypted silica fume into the mixing drum, driving the stirring shaft and the stirring blades to move in an annular mode in a vertical plane through a second motor, so that materials are turned up and down, stirring and mixing for 10-20 min, continuously adding semi-encrypted silica fume, and continuously stirring for 15-30 min;
s3, after materials are uniformly mixed, the permeable concrete durability permeable reinforcing agent is obtained, the second motor and the third motor are closed, a valve inside the discharging pipe is opened for discharging, clear water is introduced into the scraper blade through the water pump after discharging is completed, and clear water is sprayed out through the elastic scraping strip to clean the inner wall of the mixing barrel.
According to the preparation method, the anti-sticking mixing equipment comprises an outer cylinder body 1, a mixing drum 2 is arranged in the outer cylinder body 1, the mixing drum 2 is rotationally connected with the outer cylinder body 1, a discharging pipe 3 is fixedly connected in the middle of the bottom of the mixing drum 2, the lower end of the discharging pipe 3 penetrates through the bottom of the outer cylinder body 1, the discharging pipe 3 is rotationally connected with the outer cylinder body 1, a worm wheel 4 is fixedly arranged on the outer wall of the discharging pipe 3, a worm 5 is horizontally arranged in the outer cylinder body 1 in a penetrating manner, the worm wheel 4 is matched with the worm 5, two ends of the worm 5 are rotationally connected with the outer cylinder body 1, one end of the worm 5 is fixedly connected with an output shaft of a first motor 6, a stirring mechanism 7 is fixedly arranged on one side of the outer wall of the outer cylinder body 1, and a cleaning mechanism 8 is fixedly arranged on the other side of the outer wall of the outer cylinder body 1.
The stirring mechanism 7 comprises a first mounting seat 9, the first mounting seat 9 is fixedly mounted on the outer wall of the outer cylinder 1, a supporting rod 10 is vertically arranged in the first mounting seat 9, the middle and the bottom of the supporting rod 10 are respectively and rotatably connected with eccentric shafts of a first driving wheel 11 and a second driving wheel 12, the first driving wheel 11 and the second driving wheel 12 are rotatably connected with the inner wall of the first mounting seat 9, a rotating shaft of the first driving wheel 11 is fixedly connected with an output shaft of a second motor 13, a cross rod 14 facing the center of a mixing drum 2 is horizontally and fixedly mounted at the top of the supporting rod 10, a stirring shaft 15 is arranged at one end, far away from the supporting rod 10, of the cross rod 14 in a penetrating manner, the stirring shaft 15 is rotatably connected with the cross rod 14, the upper end of the stirring shaft 15 is fixedly connected with an output shaft of a third motor 16, and a plurality of stirring blades 17 are fixedly mounted at the lower end of the stirring shaft 15.
The cleaning mechanism 8 comprises a second mounting seat 18, the upper end inside the second mounting seat 18 is provided with a telescopic component 19, the telescopic component 19 comprises a sleeve 20, a connecting screw 21 is rotated at one end of the sleeve 20, the screw 21 is in threaded fit with the second mounting seat 18, the screw 21 is far away from a sleeve 20 end fixed mounting adjusting turntable 22, the other end of the sleeve 20 is penetrated and is provided with a connecting rod 23, the connecting rod 23 is in sliding connection with the second mounting seat 18, the connecting rod 23 is far away from a sleeve 20 end fixed mounting scraper 24, the connecting rod 23 penetrates and stretches into a sleeve 20 end fixed mounting limiting block 25, a spring 26 is arranged on the surface of the connecting rod 23 between the limiting block 25 and the inner wall of the sleeve 20, an elastic scraping strip 27 is fixedly mounted on one side of the inner wall of the scraper 24 close to the mixing drum 2, a water spray opening 28 is arranged on the surface of the elastic scraping strip 27, a water inlet 29 is fixedly mounted at the lower end of the limiting block 25, the water inlet 29 penetrates the sleeve 20, a water inlet 31 is connected with the outer wall of the second fixing seat 18 through an elastic hose, the water inlet 31 is connected with the water inlet 28 through an elastic hose, and the connecting rod 28 is connected with the water inlet 29 through the water inlet 28.
According to the above preparation method, the water permeation enhancers prepared by specific examples 1 to 5 are named as TSJ1, TSJ2, TSJ3, TSJ4, TSJ5, respectively, in the following order. The water permeation enhancers prepared in comparative examples 1 to 3 were named TSJ6, TSJ7, TSJ8 in the order of components and contents shown in Table 1,
TABLE 1 Components and contents (wt%) of durable Water penetration enhancers in examples 1-5 and comparative examples 1-3
Figure SMS_1
Note that: the semi-encrypted silica fume and the unencrypted silica fume in the enhancer component of TSJ8 were replaced with class I fly ash in equal amounts.
The silica fume in the TSJ1-TSJ8 adopts semi-encrypted silica fume and unencrypted silica fume according to the ratio of 2:1 weight ratio, the comparative example TSJ6 lacks the powder polyvinyl alcohol 2488, the lacking part is replaced by styrene-acrylic emulsion rubber powder, the comparative example TSJ7 lacks the waterproofing agent component and the hydrophobic agent component, the lacking part is replaced by silica fume, the comparative example TSJ8 lacks the water retention thickener component and the styrene-acrylic emulsion rubber powder, the lacking part is replaced by silica fume, and the consumption of the powder polyvinyl alcohol 2488 is 1 time more than other ratios.
The water retention thickening agents in TSJ1-TSJ3 and TSJ6 are hydroxymethyl cellulose with the viscosity of 500mPa.S, the water retention thickening agents in TSJ4 and TSJ7 are hydroxypropyl methyl cellulose with the viscosity of 950mPa.S, and the water retention thickening agents in TSJ5 are hydroxyethyl cellulose with the viscosity of 200mPa.S. The waterproof agents in TSJ1, TSJ6 and TSJ8 are fatty acid salts, the waterproof agents in TSJ2 and TSJ3 are aluminum distearate, and the waterproof agents in TSJ4 and TSJ5 are calcium stearate. The hydrophobizing agent in TSJ1-TSJ3 is octyl triethylsilane, the hydrophobizing agent in TSJ4 and TSJ6 is dodecyl triethoxysilane, and the hydrophobizing agent in TSJ5 and TSJ8 is a mixture of isooctyl triethoxysilane and decyl triethoxysilane according to a mass ratio of 1:1.
And (3) performance detection:
the various reinforcing agents prepared in the above examples and comparative examples were prepared as follows in the formulation of table 2 (% by weight), and TSJ1, TSJ2, TSJ3, TSJ4, TSJ5, TSJ6, TSJ7, TSJ8 were added to prepare pervious concrete designated as 1#, 2#, 3#, 4#, 5#, 6#, 7#, 8#, and the pervious concrete prepared in the blank examples was designated as 9#.
The cementing material is Meng Xi 52.5.5 ordinary Portland cement with the dosage of 400kg/m, the aggregate is low-grade waste iron ore produced when the ore dressing plant of the inner Mongolian medical iron ore limited company selects iron powder, the particle size is 100mm-20mm, and the crushing value is less than or equal to 10 percent. The content of needle-shaped particles is less than or equal to 5 percent, and the content of mud is less than or equal to 0.5 percent. Other indexes meet the requirements of JGJ52-2016 on coarse aggregate: the sand is medium sand with fineness modulus of 2.6 or 30-70 mesh quartz sand, and the water is tap water. 400kg cement was blended at 4% of the durable water penetration enhancer cement: 16kg of reinforcing agent.
Table 21 # to 9# durable pervious concrete composition Table (kg)
Figure SMS_2
Note that: the mixing ratio can be adjusted according to the mass when various raw materials are changed, and the water consumption can be adjusted during production according to the water absorption rate of stones and the slump of the mixture.
200kg of pervious concrete with equal mixing amount is prepared by the 9 groups of formulas according to equal proportion.
Preparing a test piece, namely mixing, forming and maintaining the concrete by referring to the mixing proportion of the pervious concrete specified in GJJ/T135 technical regulations of pervious concrete pavement, pouring and forming 150mm by 150mm standard compression test blocks, 150mm by 150mm standard fracture test blocks and freeze-thawing resistant test pieces after mixing the pervious concrete, removing a mold after maintaining for 1d, standard maintaining for 28d, and testing according to the relevant regulations in GB50081 standard of ordinary concrete mechanical property experiment methods, wherein the freeze-resistant property experiment method is tested according to the relevant regulations in GB/T50082-2009 standard of ordinary concrete long-term property and durability experiment methods.
Testing the corrosion resistance of the pervious concrete; with 25% concentration of NH 4 The Cl solution is soaked in the permeable concrete test piece to accelerate the corrosion process. (replacement of the solution every 10 days), test after soaking for different times (28 d,56d,90 d), respectively, the compressive strength of the test piece and the compressive strength of the standard test piece were measured, and the ratio was used as a parameter for evaluating the corrosion resistance. The compressive strength test is carried out by referring to relevant regulations in GB50081 "standard of ordinary concrete mechanical property experiment method".
Experimental test results of permeable concrete with durability of tables 31 # to 9#
Figure SMS_3
As can be seen from the compression resistance of the results in the table, in the examples TSJ1, TSJ2, TSJ3, TSJ4 and TSJ5, the optimal proportion collocation is TSJ3, and each experimental performance index in the 3# pervious concrete is the highest. Next are TSJ2, TSJ4, TSJ1 and TSJ5. By comparing TSJ1 with TSJ5, the addition of the adhesive, the waterproofing agent and the hydrophobing agent does not better increase various experimental performance indexes and is uneconomical. As shown in the TSJ1-TSJ5 examples, the comparative examples TSJ6-TSJ8 and the blank comparative example TSJ9, each item of experimental data of TSJ1, TSJ2, TSJ3, TSJ4 and TSJ5 is larger than that of the comparative examples TSJ6, TSJ7 and TSJ8, and the antifreezing performance, rainwater erosion resistance, compression resistance and flexural strength of the blank 9# water permeable concrete can be seen that the addition of the durable water permeable agent plays a key role in various aspects.
As shown by the data in 8# pervious concrete, TSJ8 is lack of an adhesive component, the reinforcing agent component is replaced by fly ash, the compression strength and the flexural strength are as low as those of 9# blank by 50%, and compared with 9# blank, the addition of 8# waterproof agent and hydrophobic agent improves the freezing resistance and the rainwater corrosion resistance by more than 30%.
As seen from the data in the 7# pervious concrete, the compressive flexural strength was nearly the same as the mechanical strength in the 1# pervious concrete due to the addition of the binder and reinforcing components in TSJ 7. As TSJ7 in the 7# pervious concrete lacks a waterproofing agent, the freezing resistance and the rain erosion resistance of the hydrophobizing agent are lower by 30% -40%, and other data are similar to those of the 1# pervious concrete.
As shown by the data in the 6# pervious concrete, as less polyvinyl alcohol 2488 is contained in the adhesive in the TSJ6, and the adhesive powder is used for replacement, the compressive and flexural strength is compared with the 1# pervious concrete, the compressive and flexural strength is slightly lower, and other performance indexes are similar to various data in the 1# pervious concrete.
Based on the embodiment 1, the weight percentages of the water reducing agent component, the adhesive component, the reinforcing agent component, the water retention thickening agent component, the waterproof agent component and the hydrophobe component are kept unchanged, the prepared durable water permeable reinforcing agent TSJ1 is prepared into a plurality of groups of water permeable concrete according to different addition amounts, and the prepared durable water permeable concrete is respectively named as 10#, 11#, 12#, 13#, 14#, 15#, 16#, 17#, for convenience of comparison. 10# is a blank example.
Table 4 composition table of 10# to 17# pervious concrete
Figure SMS_4
Note that: the mixing ratio can be adjusted according to the mass when various raw materials are changed, and the cement consumption can be adjusted in the production time according to the water absorption rate of stones and the slump condition of the mixture.
And (3) preparing a test piece, namely mixing, forming and maintaining the concrete by referring to the mixing ratio of the pervious concrete specified in GJJ/T135 'technical regulations of pervious concrete pavement', pouring and forming 150mm by 150mm standard compression test blocks and 150mm by 150mm standard fracture test blocks and fusion test pieces after mixing the pervious concrete, and removing the die after curing for 1d with the die, and carrying out standard curing for 28d. Physical properties were tested according to the relevant regulations in GB50081 Standard of Experimental methods for mechanical Properties of ordinary concrete.
The antifreeze performance test method is tested according to the relevant regulations in GB/T50082-2009 "ordinary concrete Long-term Performance and durability test method Standard".
Testing the corrosion resistance of the pervious concrete; with 25% concentration of NH 4 Soaking in Cl solutionThe water concrete test piece accelerates its erosion process. (replacement of the solution every 10 days), test after soaking for different times (28 d,56d,90 d), respectively, the compressive strength of the test piece and the compressive strength of the standard test piece were measured, and the ratio was used as a parameter for evaluating the corrosion resistance. The compressive strength test is carried out by referring to relevant regulations in GB50081 "standard of ordinary concrete mechanical property experiment method".
Experimental test results of permeable concrete with durability of tables 5# 10 to 17#
Figure SMS_5
From the data in Table 5, it is clear that the addition of the durable water permeation enhancer in 11# is 1% of cement, and the strength and water permeation coefficient of concrete are not greatly affected by comparison with 10 #. As seen from 12# pervious concrete, the strength of the concrete is remarkably improved when the mixing amount of the reinforcing agent is 2% of that of cement, and the freezing resistance is improved from F25 to F50. The rain erosion resistance also starts to improve.
Compared with the tests of No. 13, no. 14 and No. 15, when the mixing amount of the reinforcing agent is 3%, 4% and 5% of that of cement, the compressive strength, the flexural strength, the antifreezing performance and the rainwater erosion resistance of the concrete are continuously increased in a proportional relationship, and the water permeability coefficient is not greatly changed.
As shown by test data of No. 16 and No. 17, when the mixing amount of the reinforcing agent is 6% and 7% of cement, the strength of the permeable concrete is not obviously improved, and the optimal mixing amount of the permeable reinforcing agent is proved to be about 4% -5%. From the test results, the addition amount of the durable water permeable reinforcing agent is increased, the strength of the water permeable concrete is increased, the water permeability coefficient and the porosity are basically unchanged, when the addition amount of the durable water permeable reinforcing agent is increased by 3% -6%, the strength of the water permeable concrete is increased along with the increase of the addition amount, the freezing resistance and the rainwater erosion resistance are also increased along with the increase of the addition amount, and when the addition amount exceeds 6%, the improvement of the compressive strength, the freezing resistance and the rainwater erosion resistance is not obvious, and the economy is unreasonable.
The traditional sand-free large permeable concrete has no durable permeable reinforcing agent and fine sand with a volume ratio of 2%, and has good permeable performance but low strength. The durable water permeability enhancer and the fine sand with the volume ratio of 2% are mixed in a proper amount, so that the interface bonding area and bonding strength between coarse aggregates and the thickness of slurry are increased on the basis of ensuring the water permeability, the stress area is increased, the frost resistance and the rainwater erosion resistance of the concrete are improved, and the guarantee is provided for the service life and the service life of the pervious concrete. Meanwhile, technical support and use design basis are provided for large-area preparation of the C20-C45 pervious concrete in northern cold areas, a foundation is laid for large-area popularization of the technology in China, the service life of the pervious concrete pavement is prolonged, and the use and maintenance cost is reduced.
In the description of the present specification, the descriptions of the terms "one embodiment," "example," "specific example," and the like, mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The foregoing has shown and described the basic principles, principal features and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present invention, and various changes and modifications may be made without departing from the spirit and scope of the invention, which is defined in the appended claims.

Claims (3)

1. The permeable reinforcing agent for the durability of the permeable concrete is characterized by comprising the following components in parts by weight:
5.5-6.5 parts of water reducer,
18-22 parts of a bonding agent,
56-64 parts of reinforcing component,
0.8-1.2 parts of water retention thickener,
3.5-4.5 parts of waterproof agent,
8-12 parts of a hydrophobic agent;
the reinforcing component is silica fume, wherein 38-42 parts of semi-encrypted silica fume and 18-22 parts of unencrypted silica fume;
the adhesive is prepared by mixing powdery polyvinyl alcohol and emulsion latex according to a mass ratio of 1:2, wherein the emulsion latex is styrene-acrylic emulsion latex powder or acrylic ester latex powder;
the water-retaining thickener is one or more of hydroxypropyl methyl cellulose, hydroxyethyl cellulose and hydroxymethyl cellulose, and the viscosity of the water-retaining thickener is 100-1000 mPa.S;
the waterproof agent is one of fatty acid salt, aluminum distearate or calcium stearate;
the hydrophobic agent is one or more of siloxane, octyl triethyl silane, isooctyl triethoxy silane, decyl triethoxy silane, dodecyl triethoxy silane, hexadecyl triethoxy silane and perfluoro ethyl triethoxy silane;
the preparation method of the permeable concrete durability permeable reinforcing agent comprises the following steps:
s1, adding a water reducing agent, an adhesive, a water-retaining thickener, a waterproof agent and a hydrophobic agent into a mixing barrel (2) of anti-sticking mixing equipment, driving the mixing barrel (2) to rotate through a first motor (6), controlling the rotating speed of the mixing barrel (2) to be 5-10 r/min, rotating an adjusting rotary table (22) to enable an elastic scraping strip (27) to be attached to the inner wall of the mixing barrel (2), driving a stirring shaft (15) and stirring blades (17) to rotate through a third motor (16), controlling the rotating speed of the stirring blades (17) to be 60-80 r/min, and mixing the stirring blades (17) and the mixing barrel (2) to be opposite in rotating direction, wherein the stirring blades are mixed for 5-10 min;
s2, controlling the rotation speeds of the mixing drum (2) and the stirring blades (17) to be unchanged, adding unencrypted silica fume into the mixing drum (2), driving the stirring shaft (15) and the stirring blades (17) to move in an annular mode in a vertical plane through the second motor (13), and accordingly turning materials up and down, stirring and mixing for 10-20 min, then continuously adding semi-encrypted silica fume, and continuously stirring for 15-30 min;
s3, after materials are uniformly mixed, the pervious concrete durability pervious reinforcing agent is obtained, the second motor (13) and the third motor (16) are closed, a valve inside the discharging pipe (3) is opened for discharging, clear water is introduced into the scraper (24) through the water pump after discharging is completed, and clear water is sprayed out through the elastic scraping strip (27) to clean the inner wall of the mixing barrel (2).
2. The permeable concrete durability water permeable enhancer of claim 1 wherein the water reducing agent is a polycarboxylate water reducing agent or sulfamate water reducing agent.
3. The permeable reinforcing agent for durability of permeable concrete according to claim 1, wherein the semi-encrypted silica fume has a bulk density of 450kg/m, the unencrypted silica fume has a bulk density of 180-250 kg/m, the silica fume has a mass percent of active silica of 90% or more and a specific surface area of 18000-22000 m 2 The water demand ratio per kg is not more than 110%, and 28d activity>115%。
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CN106495611A (en) * 2016-11-03 2017-03-15 重庆绿恒环保科技有限公司 A kind of rubber powder pervious concrete and preparation method thereof
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