CN114933440B - Pervious concrete additive and pervious concrete - Google Patents
Pervious concrete additive and pervious concrete Download PDFInfo
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- CN114933440B CN114933440B CN202210641574.1A CN202210641574A CN114933440B CN 114933440 B CN114933440 B CN 114933440B CN 202210641574 A CN202210641574 A CN 202210641574A CN 114933440 B CN114933440 B CN 114933440B
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- 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
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07F—ACYCLIC, CARBOCYCLIC OR HETEROCYCLIC COMPOUNDS CONTAINING ELEMENTS OTHER THAN CARBON, HYDROGEN, HALOGEN, OXYGEN, NITROGEN, SULFUR, SELENIUM OR TELLURIUM
- C07F5/00—Compounds containing elements of Groups 3 or 13 of the Periodic System
- C07F5/02—Boron compounds
- C07F5/04—Esters of boric acids
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00241—Physical properties of the materials not provided for elsewhere in C04B2111/00
- C04B2111/00284—Materials permeable to liquids
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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- 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
Abstract
The invention discloses a pervious concrete admixture which is prepared from the following components in parts by weight: 20-30 parts of rosin-based hyperbranched polyester containing carboxyl and hydroxyl, 0.5-3 parts of quinoline yellow, 2-5 parts of 4- (benzoxazol-2-yl) benzyl chloride ionized triethanolamine borate, 2-4 parts of hollow porous nano hybrid fiber, 1-2 parts of urea phosphate and 3-5 parts of kaolin. The invention also discloses pervious concrete adopting the pervious concrete admixture. The pervious concrete admixture disclosed by the invention can effectively improve the water permeability coefficient, compressive strength, freeze-thaw resistance and environmental protection performance of pervious concrete.
Description
Technical Field
The invention relates to the technical field of building materials, in particular to a pervious concrete additive and pervious concrete.
Background
The pervious concrete is ecological environment-friendly concrete, has good water permeability and air permeability, high-efficiency water storage capacity and good decoration performance, and is a novel material worthy of popularization in sponge city construction. The concrete material can meet road performance, can be coordinated and symbiotic with the natural environment, can effectively improve the heat balance of the earth surface, enhances the circulation of water above and below the earth surface, and has important significance for increasing underground water resources, relieving heat island effect and improving urban climate.
Pervious concrete is generally composed of cementitious material, coarse aggregate, water and additives. Because fine aggregate is not added, the porosity of the whole concrete structure is very high, and thus water can permeate the concrete. However, the traditional pervious concrete has poor workability, uneven pore distribution, insufficient strength and freeze-thaw resistance due to material components and preparation process, is easy to cause freeze-thaw damage, has low water permeability coefficient and poor environmental protection performance, cannot meet the requirement of paving a high-performance pavement and the requirement of draining water in rainy seasons, and influences the use and popularization of pervious concrete products. In addition, the pervious concrete on the market has the problems of poor bearing capacity, small cohesive force and water permeability coefficient among coarse aggregates, low freezing and thawing resistance and strength, easy cracking, difficult repair, hole blockage, short service life and the like in actual engineering, so that the further development of the pervious concrete is limited.
In order to solve the problems, patent CN106186926B discloses a high-strength pervious concrete admixture and pervious concrete, wherein the high-strength pervious concrete admixture is prepared from the following raw materials in parts by weight: 5-15 parts of redispersible rubber powder, 15-20 parts of gypsum powder, 1-10 parts of water reducing agent and 10-30 parts of nano composite filler. The high-strength pervious concrete admixture provided by the invention selects and selects the type and the using amount of the water reducing agent and the nano composite filler suitable for the high-strength pervious concrete admixture through reasonable proportion, and the pervious concrete prepared from the admixture has good compressive strength and water permeability coefficient, can meet various engineering requirements for water permeability of the concrete, and is beneficial to maintaining ecological balance and realizing sustainable development. However, among them, the water reducing agent is naphthalene sulfonate, and their production and use are liable to cause environmental problems; and the freeze-thaw resistance, compressive strength and water permeability coefficient of the composite material still need to be further improved.
Therefore, the prior art still needs a pervious concrete admixture capable of effectively improving the permeability coefficient, compressive strength, freeze-thaw resistance and environmental protection performance of pervious concrete and pervious concrete adopting the pervious concrete admixture.
Disclosure of Invention
The invention mainly aims to provide a pervious concrete admixture capable of effectively improving the permeability coefficient, compressive strength, freeze-thaw resistance and environmental protection performance of pervious concrete and pervious concrete adopting the pervious concrete admixture.
In order to achieve the aim, the invention provides a pervious concrete admixture which comprises the following components in parts by weight: 20-30 parts of rosin-based hyperbranched polyester containing carboxyl and hydroxyl, 0.5-3 parts of quinoline yellow, 2-5 parts of 4- (benzoxazol-2-yl) benzyl chloride ionized triethanolamine borate, 2-4 parts of hollow porous nano hybrid fiber, 1-2 parts of urea phosphate and 3-5 parts of kaolin.
Preferably, the rosin-based hyperbranched polyester containing carboxyl and hydroxyl is prepared by referring to patent CN102766264B, and the preparation method of the rosin-based hyperbranched polyester in example 1.
Preferably, the source of the hollow porous nano-hybrid fiber is featureless, and in one embodiment of the invention, the hollow porous nano-hybrid fiber is prepared according to the method in CN106987922B example 1.
Preferably, the preparation method of the 4- (benzoxazol-2-yl) benzyl chloride ionized triethanolamine borate comprises the following steps: adding 4- (benzoxazol-2-yl) benzyl chloride, triethanolamine borate and an alkaline catalyst into an organic solvent, stirring and reacting for 4-6 hours at 80-95 ℃, removing the solvent by rotary evaporation, washing for 3-6 times by using water, and finally removing residual water by rotary evaporation to obtain the 4- (benzoxazol-2-yl) benzyl chloride ionized triethanolamine borate.
Preferably, the molar ratio of the 4- (benzoxazol-2-yl) benzyl chloride to the triethanolamine borate to the basic catalyst to the organic solvent is 1 (0.3-0.5) to (6-10).
Preferably, the alkaline catalyst is at least one of sodium hydroxide, potassium hydroxide, sodium carbonate and potassium carbonate.
Preferably, the organic solvent is dimethyl sulfoxide.
Preferably, the particle size of the kaolin is 5mm to 10mm.
The invention also aims to provide pervious concrete added with the pervious concrete admixture, which comprises the following raw materials in parts by weight: 25-35 parts of cement, 70-90 parts of coarse aggregate, 3-5 parts of pervious concrete admixture, 1-2 parts of water reducing agent and 13-20 parts of water.
Preferably, the coarse aggregate is crushed stone prepared by blasting and crushing mountain rock, and the particle size of the coarse aggregate is 6-15 mm.
Preferably, the cement is general P.O42.5 ordinary portland cement.
Preferably, the water reducing agent is a basf RHEOPLUS 420 polycarboxylic acid water reducing agent.
Due to the application of the technical scheme, the invention has the following beneficial effects:
(1) The invention discloses a pervious concrete admixture which is prepared from the following components in parts by weight: 20-30 parts of rosin-based hyperbranched polyester containing carboxyl and hydroxyl, 0.5-3 parts of quinoline yellow, 2-5 parts of 4- (benzoxazol-2-yl) benzyl chloride ionized triethanolamine borate, 2-4 parts of hollow porous nano hybrid fiber, 1-2 parts of urea phosphate and 3-5 parts of kaolin. Through reasonable proportioning and selection of component types, the prepared pervious concrete admixture has good adaptability and strong bonding force with pervious concrete aggregate, can effectively improve the water permeability coefficient, compressive strength, freeze-thaw resistance and environmental protection performance of pervious concrete, and effectively prolongs the service life of the pervious concrete.
(2) According to the permeable concrete admixture disclosed by the invention, the rosin-based hyperbranched polyester containing carboxyl and hydroxyl can enhance the binding power between cement paste and aggregate, avoid the probability that pores between coarse aggregates are blocked by fallen binding components, improve the water permeability and strength of products and prolong the service life; on the other hand, the component also has water absorption and water retention performances, so that the workability of the pervious concrete is ensured, and the pervious concrete has a certain self-maintenance function. After cement is hardened, the cement is cooperated with quinoline yellow to wrap aggregate to form a hydrophobic pore wall structure; through the complexation, the content of soluble calcium in the system is reduced, the erosion risk of the pervious concrete is effectively relieved, and the durability of the pervious concrete is improved. The components and raw materials which have great influence on the environment are not used, so that the product is safe and environment-friendly to use.
(3) The permeable concrete admixture disclosed by the invention contains more hydroxyl groups, carboxyl groups, rosin groups and sulfonic groups on quinoline yellow and rosin-based hyperbranched polyester containing carboxyl and hydroxyl groups, and the quinoline yellow and rosin-based hyperbranched polyester has the effects of retarding coagulation, air entraining and water reducing under the coordination of the hydroxyl groups, the rosin groups and the sulfonic groups, so that the internal porosity of permeable concrete can be effectively improved, and the water permeability, the durability and the compressive strength can be effectively improved. The urea phosphate is added to cooperate with other components, and can also play a role in retarding coagulation and improving the antifreezing performance; 4- (benzoxazol-2-yl) benzyl chloride ionized triethanolamine borate, quinoline yellow and rosin-based hyperbranched polyester containing carboxyl and hydroxyl can interact with other components through ionic bonds, hydrogen bonds, van der waals force and the like, so that the stability of a concrete structure is improved, and the compression resistance is improved. After the cement is hardened, the 4- (benzoxazol-2-yl) benzyl chloride ionized triethanolamine borate forms a special hydrophobic film on the surface of a cementing layer wrapping the aggregate, so that water can smoothly permeate through the internal pore passages of the concrete and does not stay in the concrete, and the strength of the concrete can be improved; form a smooth surface layer, have self-cleaning and anti-fouling properties, can prevent the permeable pores from being blocked and improve the permeability durability. The molecular structure of the concrete contains benzoxazole, triethanolamine borate and quaternary ammonium salt structures which are matched with each other and act together, so that the compatibility of the concrete with other components is good, the ageing resistance of the concrete can be improved, and the service life of the pervious concrete is effectively prolonged.
(4) The permeable concrete admixture disclosed by the invention is added with the hollow porous nano hybrid fibers, and can be matched with other raw material components to improve the compressive strength, the water permeability, the flexibility and the durability; the pore distribution in the cement paste is more uniform through the filling effect, and the condition that the aggregate of the pervious concrete is scattered in an abrasion test can be effectively improved through enhancing the interface area and the paste binding force, so that the water permeability durability of the pervious concrete is improved, and the service life of the pervious concrete is prolonged.
Detailed Description
The following description is provided to disclose the invention so as to enable any person skilled in the art to practice the invention. The preferred embodiments in the following description are given by way of example only, and other obvious variations will occur to those skilled in the art.
The rosin-based hyperbranched polyester containing carboxyl and hydroxyl in each embodiment of the invention is prepared by referring to a preparation method of the rosin-based hyperbranched polyester in patent CN102766264B embodiment 1; the hollow porous nano hybrid fiber is prepared according to the method in CN106987922B, example 1.
Example 1
The permeable concrete admixture is prepared from the following components in parts by weight: 20 parts of rosin-based hyperbranched polyester containing carboxyl and hydroxyl, 0.5 part of quinoline yellow, 2 parts of 4- (benzoxazol-2-yl) benzyl chloride ionized triethanolamine borate, 2 parts of hollow porous nano hybrid fiber, 1 part of urea phosphate and 3 parts of kaolin.
The preparation method of the 4- (benzoxazol-2-yl) benzyl chloride ionized triethanolamine borate comprises the following steps: adding 4- (benzoxazol-2-yl) benzyl chloride, triethanolamine borate and an alkaline catalyst into an organic solvent, stirring and reacting for 4 hours at 80 ℃, removing the solvent by rotary evaporation, washing for 3 times, and finally removing residual water by rotary evaporation to obtain 4- (benzoxazol-2-yl) benzyl chloride ionized triethanolamine borate; the molar ratio of the 4- (benzoxazol-2-yl) benzyl chloride to the triethanolamine borate to the basic catalyst to the organic solvent is 1; the alkaline catalyst is sodium hydroxide; the organic solvent is dimethyl sulfoxide. The product is placed in a silver nitrate aqueous solution with the mass percentage concentration of 15wt%, generation of white precipitate is observed, realization of ionization is verified, and nitrogen in triethanolamine borate in the obtained product is completely ionized through element analysis; the particle size of the kaolin is 5mm-10mm.
The pervious concrete added with the pervious concrete admixture comprises the following raw materials in parts by weight: 25 parts of cement, 70 parts of coarse aggregate, 3 parts of pervious concrete admixture, 1 part of water reducing agent and 13 parts of water.
The coarse aggregate is crushed stone prepared by blasting and crushing mountain rock, and the particle size of the coarse aggregate is 6-15 mm; the cement is general P.O42.5 ordinary portland cement; the water reducing agent is a polycarboxylate water reducing agent of Basff RHEOPLUS 420.
Example 2
The permeable concrete admixture is prepared from the following components in parts by weight: 22 parts of rosin-based hyperbranched polyester containing carboxyl and hydroxyl, 1.2 parts of quinoline yellow, 3 parts of 4- (benzoxazol-2-yl) benzyl chloride ionized triethanolamine borate, 2.5 parts of hollow porous nano hybrid fiber, 1.2 parts of urea phosphate and 3.5 parts of kaolin.
The preparation method of the 4- (benzoxazol-2-yl) benzyl chloride ionized triethanolamine borate comprises the following steps: adding 4- (benzoxazol-2-yl) benzyl chloride, triethanolamine borate and an alkaline catalyst into an organic solvent, stirring and reacting for 4.5 hours at 85 ℃, removing the solvent by rotary evaporation, washing with water for 4 times, and finally removing residual water by rotary evaporation to obtain 4- (benzoxazol-2-yl) benzyl chloride ionized triethanolamine borate; the molar ratio of the 4- (benzoxazol-2-yl) benzyl chloride to the triethanolamine borate to the basic catalyst to the organic solvent is 1; the alkaline catalyst is potassium hydroxide; the organic solvent is dimethyl sulfoxide; the particle size of the kaolin is 5mm-10mm.
The pervious concrete added with the pervious concrete admixture comprises the following raw materials in parts by weight: 28 parts of cement, 75 parts of coarse aggregate, 3.5 parts of pervious concrete admixture, 1.2 parts of water reducing agent and 15 parts of water.
The coarse aggregate is crushed stone prepared by blasting and crushing mountain rock, and the particle size of the coarse aggregate is 6-15 mm; the cement is general P.O42.5 ordinary portland cement; the water reducing agent is a polycarboxylate water reducing agent of Basff RHEOPLUS 420.
Example 3
The permeable concrete admixture is prepared from the following components in parts by weight: 25 parts of rosin-based hyperbranched polyester containing carboxyl and hydroxyl, 2 parts of quinoline yellow, 3.5 parts of 4- (benzoxazol-2-yl) benzyl chloride ionized triethanolamine borate, 3 parts of hollow porous nano hybrid fiber, 1.5 parts of urea phosphate and 4 parts of kaolin.
The preparation method of the 4- (benzoxazol-2-yl) benzyl chloride ionized triethanolamine borate comprises the following steps: adding 4- (benzoxazol-2-yl) benzyl chloride, triethanolamine borate and an alkaline catalyst into an organic solvent, stirring and reacting for 5 hours at 88 ℃, removing the solvent by rotary evaporation, washing with water for 5 times, and finally removing residual water by rotary evaporation to obtain 4- (benzoxazol-2-yl) benzyl chloride ionized triethanolamine borate; the molar ratio of the 4- (benzoxazol-2-yl) benzyl chloride to the triethanolamine borate to the basic catalyst to the organic solvent is (1); the alkaline catalyst is sodium carbonate; the organic solvent is dimethyl sulfoxide; the particle size of the kaolin is 5mm-10mm.
The pervious concrete added with the pervious concrete admixture comprises the following raw materials in parts by weight: 30 parts of cement, 80 parts of coarse aggregate, 4 parts of pervious concrete admixture, 1.5 parts of water reducing agent and 17 parts of water.
The coarse aggregate is crushed stone prepared by blasting and crushing mountain rock, and the particle size of the coarse aggregate is 6-15 mm; the cement is general P.O42.5 ordinary portland cement; the water reducing agent is a polycarboxylate water reducing agent of Basff RHEOPLUS 420.
Example 4
The permeable concrete admixture is prepared from the following components in parts by weight: 28 parts of rosin-based hyperbranched polyester containing carboxyl and hydroxyl, 2.7 parts of quinoline yellow, 4.5 parts of 4- (benzoxazol-2-yl) benzyl chloride ionized triethanolamine borate, 3.5 parts of hollow porous nano hybrid fiber, 1.8 parts of urea phosphate and 4.5 parts of kaolin.
The preparation method of the 4- (benzoxazol-2-yl) benzyl chloride ionized triethanolamine borate comprises the following steps: adding 4- (benzoxazol-2-yl) benzyl chloride, triethanolamine borate and an alkaline catalyst into an organic solvent, stirring and reacting for 5.5 hours at 92 ℃, removing the solvent by rotary evaporation, washing with water for 6 times, and finally removing residual water by rotary evaporation to obtain 4- (benzoxazol-2-yl) benzyl chloride ionized triethanolamine borate; the molar ratio of the 4- (benzoxazol-2-yl) benzyl chloride to the triethanolamine borate to the basic catalyst to the organic solvent is 1; the alkaline catalyst is a mixture formed by mixing sodium hydroxide, potassium hydroxide, sodium carbonate and potassium carbonate according to the mass ratio of 1; the organic solvent is dimethyl sulfoxide; the particle size of the kaolin is 5mm-10mm.
The pervious concrete added with the pervious concrete admixture comprises the following raw materials in parts by weight: 33 parts of cement, 85 parts of coarse aggregate, 4.5 parts of pervious concrete admixture, 1.8 parts of water reducing agent and 19 parts of water; the coarse aggregate is crushed stone prepared by blasting and crushing mountain rock, and the particle size of the coarse aggregate is 6-15 mm; the cement is general P.O42.5 ordinary portland cement; the water reducing agent is a polycarboxylate water reducing agent of Basff RHEOPLUS 420.
Example 5
The permeable concrete admixture is prepared from the following components in parts by weight: 30 parts of rosin-based hyperbranched polyester containing carboxyl and hydroxyl, 3 parts of quinoline yellow, 5 parts of 4- (benzoxazol-2-yl) benzyl chloride ionized triethanolamine borate, 4 parts of hollow porous nano hybrid fiber, 2 parts of urea phosphate and 5 parts of kaolin.
The preparation method of the 4- (benzoxazol-2-yl) benzyl chloride ionized triethanolamine borate comprises the following steps: adding 4- (benzoxazol-2-yl) benzyl chloride, triethanolamine borate and an alkaline catalyst into an organic solvent, stirring and reacting for 6 hours at 95 ℃, removing the solvent by rotary evaporation, washing with water for 6 times, and finally removing residual water by rotary evaporation to obtain 4- (benzoxazol-2-yl) benzyl chloride ionized triethanolamine borate; the molar ratio of the 4- (benzoxazol-2-yl) benzyl chloride to the triethanolamine borate to the basic catalyst to the organic solvent is 1; the alkaline catalyst is potassium carbonate; the organic solvent is dimethyl sulfoxide; the particle size of the kaolin is 5mm-10mm.
The pervious concrete added with the pervious concrete admixture comprises the following raw materials in parts by weight: 35 parts of cement, 90 parts of coarse aggregate, 5 parts of pervious concrete admixture, 2 parts of water reducing agent and 20 parts of water; the coarse aggregate is crushed stone prepared by blasting and crushing mountain rock, and the particle size of the coarse aggregate is 6-15 mm; the cement is general P.O42.5 ordinary portland cement; the water reducing agent is a polycarboxylate water reducing agent of Basff RHEOPLUS 420.
Comparative example 1
The invention provides a pervious concrete admixture and pervious concrete, which are similar to example 1, except that quinoline yellow and hollow porous nano hybrid fibers are not added.
Comparative example 2
The present invention provides a water-permeable concrete admixture and water-permeable concrete, which are similar to those of example 1, except that 4- (benzoxazol-2-yl) benzyl chloride ionized triethanolamine borate and urea phosphate were not added.
In order to further illustrate the beneficial technical effects of the pervious concrete prepared in the embodiments of the present invention, the pervious concrete prepared in each embodiment is subjected to a relevant performance test, the test results are shown in table 1, and the test method is as follows: mixing the raw material components uniformly, making into a plurality of permeable concrete brick sample pieces with the sizes of 20cm multiplied by 5cm, naturally curing for 28 days, delivering samples for testing,
(1) Water permeability coefficient: the water permeability coefficient test method disclosed in appendix C of GB/T25993-2010 permeable pavement bricks and permeable pavement slabs is referred to for testing, the water permeability coefficients of different products at the water temperature of 15 ℃ are calculated, and the larger the water permeability coefficient of the product is, the better the water permeability of the product is.
(2) Compressive strength: and (3) detecting the 28d compressive strength (MPa) of the pervious concrete according to GB/T50081-2002 standard of common concrete mechanical property test methods.
(3) The freezing resistance performance is as follows: according to the frost resistance test method disclosed in GB/T4111-2013 concrete block and brick test method, 10 pervious concrete brick samples are taken in each example, freeze-thaw treatment (20 times of freeze-thaw cycle) is carried out on 5 samples, freeze-thaw treatment is not carried out on 5 samples, the average compressive strength of 5 freeze-thaw samples and the average compressive strength of 5 samples which are not freeze-thawed are calculated, the average compressive strength loss rate of the product before and after freeze-thaw treatment is calculated, the smaller the average compressive strength loss rate of the product is, and the better the frost resistance of the product is.
As can be seen from table 1, the pervious concrete admixture and the pervious concrete using the same disclosed in the embodiments of the present invention have more excellent water permeability, compressive strength and freeze-thaw resistance than the comparative product, which are the result of the synergistic effect of the components, and the addition of quinoline yellow, hollow porous nano hybrid fiber, 4- (benzoxazol-2-yl) benzyl chloride ionized triethanolamine borate and urea phosphate is beneficial to improving the above properties.
TABLE 1
| Item | Coefficient of water permeability | 28d compressive strength | Rate of loss of average compressive strength |
| Unit of | mm/s | MPa | % |
| Example 1 | 11.5 | 47.2 | 1.42 |
| Example 2 | 12.2 | 49.0 | 1.25 |
| Example 3 | 12.6 | 51.5 | 1.03 |
| Example 4 | 13.6 | 53.5 | 0.96 |
| Example 5 | 14.4 | 55.1 | 0.86 |
| Comparative example 1 | 9.3 | 40.4 | 1.55 |
| Comparative example 2 | 8.5 | 43.5 | 2.05 |
The foregoing shows and describes the general principles, essential 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, which are merely illustrative of the principles of the invention, but various changes and modifications may be made without departing from the spirit and scope of the invention, which is defined by the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (9)
1. The pervious concrete admixture is characterized by comprising the following components in parts by weight: 20-30 parts of rosin-based hyperbranched polyester containing carboxyl and hydroxyl, 0.5-3 parts of quinoline yellow, 2-5 parts of 4- (benzoxazol-2-yl) benzyl chloride ionized triethanolamine borate, 2-4 parts of hollow porous nano hybrid fiber, 1-2 parts of urea phosphate and 3-5 parts of kaolin;
the preparation method of the 4- (benzoxazol-2-yl) benzyl chloride ionized triethanolamine borate comprises the following steps: adding 4- (benzoxazol-2-yl) benzyl chloride, triethanolamine borate and an alkaline catalyst into an organic solvent, stirring and reacting for 4-6 hours at 80-95 ℃, removing the solvent by rotary evaporation, washing for 3-6 times by using water, and finally removing residual water by rotary evaporation to obtain the 4- (benzoxazol-2-yl) benzyl chloride ionized triethanolamine borate.
2. The pervious concrete admixture of claim 1, wherein the molar ratio of 4- (benzoxazol-2-yl) benzyl chloride, triethanolamine borate, basic catalyst and organic solvent is 1 (0.3-0.5) to (6-10).
3. The pervious concrete admixture of claim 1, wherein the basic catalyst is at least one of sodium hydroxide, potassium hydroxide, sodium carbonate, potassium carbonate.
4. The pervious concrete admixture of claim 1, wherein the organic solvent is dimethyl sulfoxide.
5. The pervious concrete admixture of claim 1, wherein the kaolin has a particle size of 5mm to 10mm.
6. A pervious concrete adopting the pervious concrete admixture as claimed in any one of claims 1 to 5, which is characterized by comprising the following raw materials in parts by weight: 25-35 parts of cement, 70-90 parts of coarse aggregate, 3-5 parts of pervious concrete admixture, 1-2 parts of water reducing agent and 13-20 parts of water.
7. The pervious concrete of claim 6, wherein the coarse aggregate is crushed stone obtained by blasting and crushing mountain rock, and the particle size of the coarse aggregate is 6mm to 15mm.
8. The pervious concrete of claim 6, characterized in that the cement is a general purpose P.O42.5 Portland cement.
9. The pervious concrete of claim 6, characterized in that said water reducing agent is a basf RHEOPULUS 420 polycarboxylate water reducing agent.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6248697B1 (en) * | 1997-02-12 | 2001-06-19 | Kb Technologies, Ltd. | Composition and method for a dual-function soil-grouting excavating or boring fluid |
| JP2003327458A (en) * | 2002-03-08 | 2003-11-19 | Kao Corp | Additive for water-permeable concrete |
| CN109369061A (en) * | 2018-10-22 | 2019-02-22 | 东莞理工学院 | A kind of pervious concrete additive and pervious concrete |
| CN109516729A (en) * | 2018-12-06 | 2019-03-26 | 绵阳锐龙建材有限公司 | The preparation method of pervious concrete |
-
2022
- 2022-06-08 CN CN202210641574.1A patent/CN114933440B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6248697B1 (en) * | 1997-02-12 | 2001-06-19 | Kb Technologies, Ltd. | Composition and method for a dual-function soil-grouting excavating or boring fluid |
| JP2003327458A (en) * | 2002-03-08 | 2003-11-19 | Kao Corp | Additive for water-permeable concrete |
| CN109369061A (en) * | 2018-10-22 | 2019-02-22 | 东莞理工学院 | A kind of pervious concrete additive and pervious concrete |
| CN109516729A (en) * | 2018-12-06 | 2019-03-26 | 绵阳锐龙建材有限公司 | The preparation method of pervious concrete |
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