CN112079604A - Permeable compression-resistant concrete and preparation method thereof - Google Patents
Permeable compression-resistant concrete and preparation method thereof Download PDFInfo
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- CN112079604A CN112079604A CN202010908032.7A CN202010908032A CN112079604A CN 112079604 A CN112079604 A CN 112079604A CN 202010908032 A CN202010908032 A CN 202010908032A CN 112079604 A CN112079604 A CN 112079604A
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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
- 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
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- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The application relates to the field of pervious concrete, in particular to pervious compression-resistant concrete and a preparation method thereof, wherein the pervious compression-resistant concrete comprises the following components in parts by weight: coarse aggregate: 1050-; fine sand: 160-220 parts; cement: 150-210 parts; water: 140 portions and 190 portions; fine powder additive: 80-105 parts of a modifier; water reducing agent: 3.1-4.25 parts; the coarse aggregate comprises broken stone particles and ceramic particles, and the fine powder additive comprises fly ash, silica gel powder and talcum powder. This application has the water permeability who maintains the concrete, improves the effect of the crushing resistance ability of concrete.
Description
Technical Field
The application relates to the field of pervious concrete, in particular to pervious compression-resistant concrete and a preparation method thereof.
Background
At present, the pervious concrete is mainly non-sand macroporous pervious concrete, and the pervious concrete is porous concrete prepared by mixing coarse aggregate, admixture, cement, admixture and water. The cellular structure with uniformly distributed pores is formed by coating a thin layer of cement slurry on the surface of the coarse aggregate and bonding the thin layer of cement slurry, and has the characteristics of air permeability, insignificant capillarity, high water permeability, small cement consumption, simple construction and the like. The strength is 5-15 MPa, and the water permeable brick is generally used for highway slope protection and water permeable bricks.
In the process of manufacturing the pervious concrete, sand is not used, and the purpose is to improve the porosity of the concrete and the water permeability of the concrete. In fact, the water permeability coefficient of the pervious concrete is in a linear relation with the effective porosity, but not in a proportional relation with the total porosity. The effective void ratio is not always increased along with the increase of the total void ratio, the increase of the total void ratio causes the bonding area between cement paste and stones to be small, the defects of interface structures are more, the strength of pervious concrete is obviously reduced, but the water permeability coefficient is not increased. Therefore, the water permeability is increased by manufacturing the sand-free concrete, and the compression resistance of the concrete is easily affected.
Disclosure of Invention
In order to maintain the water permeability of concrete, improve the compressive property of concrete, this application provides a compressive concrete permeates water.
In a first aspect, the application provides a pervious compression-resistant concrete, which adopts the following technical scheme:
the permeable compression-resistant concrete comprises the following components in parts by weight:
coarse aggregate: 1050-;
fine sand: 160-220 parts;
cement: 150-210 parts;
water: 140 portions and 190 portions;
fine powder additive: 80-105 parts of a modifier;
water reducing agent: 3.1-4.25 parts;
the coarse aggregate comprises broken stone particles and ceramic particles, and the fine powder additive comprises fly ash, silica gel powder and talcum powder.
By adopting the technical scheme, the fine sand fills the gaps among the coarse aggregates, so that the invalid gaps of the concrete are reduced, the connection performance among the coarse aggregates is improved, the compression resistance of the concrete is improved, meanwhile, the fine sand has little influence on the effective gaps of the concrete, and has little influence on the water permeability of the concrete, and according to the performance detection data of the embodiment 3 and the comparative example 2, the concrete added with the fine sand is almost kept unchanged in the water permeability, and the compression resistance of the concrete added with the fine sand is greatly improved in the compression resistance of the concrete, so that the compression resistance of the concrete is improved;
the concrete is added with the fine powder additive, wherein the talcum powder enables the concrete to be stirred more smoothly and facilitates processing of the concrete, the fly ash becomes colloidal after being mixed and facilitates connection between the coarse aggregates, the silica gel powder has adsorption capacity and adsorbs the fly ash and the talcum powder to be firmly filled between the coarse aggregates so as to further improve the compressive strength of the concrete, the silica gel powder has a microporous structure after being mixed so as to facilitate maintenance of the water permeability of the concrete, and according to performance detection data of the embodiment 3 and the comparative example 1, after the fine powder additive is replaced by mineral powder which is selected conventionally, the compressive performance and the water permeability of the concrete are improved.
Preferably, the weight ratio of the fly ash, the silica gel powder and the talcum powder is (40-50): (20-30): (18-27).
By adopting the technical scheme, the performance detection data of the embodiment 3 and the embodiment 8 show that the weight ratio of the fly ash, the silica gel powder and the talcum powder in the fine powder additive is set in the proportion, so that the prepared concrete has good compressive strength and water permeability.
Preferably, the weight ratio of the crushed stone particles to the ceramic particles is (600-800): (450-700).
Through adopting above-mentioned technical scheme, use rubble granule and ceramic granule in the coarse aggregate mixedly, the rubble granule is as the major structure frame, and the shape of rubble granule is more mellow and smooth than ceramic granule, the connection between the coarse aggregate of being convenient for, and maintain the compressive property of concrete, and the ceramic granule is irregular, is convenient for leave bigger space between the coarse aggregate, and improves the water permeability of concrete. According to the performance test data of the examples 1-6, the weight ratio of the crushed stone particles to the ceramic particles is (600-800): (450-700), the prepared concrete has little difference between the compression resistance and the water permeability, and the weight ratio of the crushed stone particles to the ceramic particles is 1.3:1, the prepared concrete has better compression resistance and water permeability.
Preferably, the particle size of the crushed stone particles and the particle size of the ceramic particles are both 5-15mm, and the particle size of the fine sand is 0.2-0.25 mm.
Through adopting above-mentioned technical scheme, when rubble granule and ceramic particle's particle diameter were less than 5mm, the clearance between the coarse aggregate was less this moment, influences the water permeability of the concrete who makes, and when rubble granule and ceramic particle's particle diameter were greater than 15mm, the space between the coarse aggregate was great, has more invalid space, and it is less to the water permeability promotion of concrete, but to seriously influence the compressive property of finished product concrete. The particle size of the fine sand is selected within the range, so that the filling of redundant gaps among the coarse aggregates is facilitated, the gaps among the fine sand are conveniently reserved to maintain effective gaps, and the water permeability of the concrete is conveniently maintained.
Preferably, the cement comprises at least one of portland cement, aluminate cement and sulphoaluminate cement.
By adopting the technical scheme, the portland cement, the aluminate cement and the sulphoaluminate cement are cement materials with excellent performance, low price and easy obtainment, and the cements have strong gelling and bonding capabilities, play a good gluing role in concrete, are convenient for leading the connection strength between coarse aggregates to be higher and are beneficial to improving the mechanical property of the concrete. .
Preferably, the solid content of the water reducing agent is 20%, and the water reducing rate is more than 30%.
By adopting the technical scheme, the high-efficiency water reducing agent is selected to further improve the fluidity of the prepared concrete, so that the pumping performance of the concrete in the subsequent working process is ensured.
In a second aspect, the application provides a method for preparing permeable compressive concrete, which adopts the following technical scheme:
a preparation method of permeable compression-resistant concrete is characterized by comprising the following steps: the method comprises the following steps:
s1: mixing and stirring the fly ash, the silica gel powder and the talcum powder to prepare a fine powder additive;
s2: and sequentially putting the coarse aggregate, the fine sand, the cement, the water reducing agent, the water and the fine powder additive prepared in the S1 into a stirrer to be uniformly stirred to prepare the permeable compression-resistant concrete.
Preferably, the S2 specifically includes:
s21: firstly, fine sand, coarse aggregate, cement and a water reducing agent are put into a stirrer to be uniformly stirred to form a primary mixed material;
s22: pouring 70% of the required water into a stirrer, and further uniformly stirring the primary mixed material;
s23: adding the fine powder additive prepared in the step S1 into a stirrer, adding the rest 30 percent of water, and uniformly stirring by the stirrer to prepare the permeable compression-resistant concrete.
By adopting the technical scheme, the fine sand, the coarse aggregate, the cement and the water reducing agent are mixed firstly, so that the fine sand and the coarse aggregate are mixed uniformly, the fine sand is filled in gaps among the coarse aggregates, ineffective gaps are reduced conveniently, 70% of water in the total amount is added firstly, so that the coarse aggregates and the fine sand are convenient to adhere to each other, and the basic form of the concrete is formed; the fine powder additive is uniformly mixed, so that the fly ash, the silica gel powder and the talcum powder are uniformly dispersed in the concrete, the talcum powder and the fly ash are adsorbed and filled in gaps among the coarse aggregates by the silica gel powder, the smoothness of the concrete during stirring is improved by adding the talcum powder, the concrete is convenient to manufacture, and the compression resistance and the water permeability of the concrete prepared by the steps are improved compared with those of the concrete prepared by the conventional method according to performance detection data of the embodiment 3 and the comparative example 3.
In summary, the present application includes at least one of the following beneficial technical effects:
1. fine sand and fine powder additives are added into the pervious concrete, and gaps among the coarse aggregates of the team are filled, so that the connection performance among the coarse aggregates is improved, the compressive strength of the concrete is improved, the effective void ratio among the coarse aggregates is not easily influenced by the fine sand and the fine powder additives, and the compressive performance of the concrete is improved while the water permeability of the concrete is improved;
2. the talcum powder is added into the concrete, so that the concrete is stirred more smoothly when the stirred concrete is processed, various materials are stirred more uniformly, the processing is facilitated, the uniformity of the materials is improved, and the water permeability and the compression resistance of the concrete are improved;
3. the adsorption capacity of the silica gel powder is convenient for adsorbing the powder to fill in gaps among the coarse aggregates, so that the connection strength among the coarse aggregates is improved, the compressive strength of the concrete is improved, meanwhile, the water permeability of the concrete is maintained by the microporous structure of the silica gel powder, and the compressive performance of the concrete is improved while the water permeability is maintained.
Detailed Description
Example 1
The application discloses compressive concrete permeates water, including coarse aggregate, fine sand, cement, water, fine powder additive and water-reducing agent.
Wherein the coarse aggregate comprises crushed stone and ceramic particles.
The fine powder additive comprises fly ash, silica gel powder and talcum powder.
The cement is portland cement.
The water reducing agent is lignosulphonate water reducing agent, the solid content is 20%, and the water reducing rate is more than 30%.
The specific weight fractions of the components are detailed in table 1.
Wherein the weight ratio of the fly ash, the silica gel powder and the talcum powder in the fine powder additive is 40:20: 18.
The weight ratio of the crushed stone particles to the ceramic particles in the coarse aggregate is 600: 450.
The preparation method of the permeable compression-resistant concrete comprises the following steps:
s1: mixing and stirring the fly ash, the silica gel powder and the talcum powder to prepare a fine powder additive;
s2: and sequentially putting the coarse aggregate, the fine sand, the cement, the water reducing agent, the water and the fine powder additive prepared in the S1 into a stirrer to be uniformly stirred to prepare the permeable compression-resistant concrete.
Wherein S2 specifically includes:
s21: firstly, fine sand, coarse aggregate, cement and a water reducing agent are put into a stirrer to be uniformly stirred to form a primary mixed material;
s22: pouring 70% of the required water into a stirrer, and further uniformly stirring the primary mixed material;
s23: adding the fine powder additive prepared in the step S1 into a stirrer, adding the rest 30 percent of water, and uniformly stirring by the stirrer to prepare the permeable compression-resistant concrete.
Example 2
The permeable compression-resistant concrete comprises different components in parts by weight, and the detailed numerical values are shown in table 1.
Wherein:
the weight ratio of the fly ash, the silica gel powder and the talcum powder in the fine powder additive is 43:22: 20.
The weight ratio of the crushed stone particles to the ceramic particles in the coarse aggregate is 660: 500.
example 3
The permeable compression-resistant concrete comprises different components in parts by weight, and the detailed numerical values are shown in table 1.
Wherein:
the weight ratio of the fly ash, the silica gel powder and the talcum powder in the fine powder additive is 46:24: 22.
The weight ratio of the crushed stone particles to the ceramic particles in the coarse aggregate is 720: 560.
example 4
The permeable compression-resistant concrete comprises different components in parts by weight, and the detailed numerical values are shown in table 1.
Wherein:
the weight ratio of the fly ash, the silica gel powder and the talcum powder in the fine powder additive is 48: 25:23.
The weight ratio of the crushed stone particles to the ceramic particles in the coarse aggregate is 750: 590.
Example 5
The permeable compression-resistant concrete comprises different components in parts by weight, and the detailed numerical values are shown in table 1.
Wherein:
the weight ratio of the fly ash, the silica gel powder and the talcum powder in the fine powder additive is 50:26: 24.
The weight ratio of the crushed stone particles to the ceramic particles in the coarse aggregate is 800: 630.
Example 6
The permeable compression-resistant concrete comprises different components in parts by weight, and the detailed numerical values are shown in table 1.
Wherein:
the weight ratio of the fly ash, the silica gel powder and the talcum powder in the fine powder additive is 52:28: 25.
The weight ratio of the crushed stone particles to the ceramic particles in the coarse aggregate is 800: 700.
Example 7
A permeable compression-resistant concrete, compared with the concrete in example 3, has different weight ratios of the gravel particles and the ceramic particles, and the detailed numerical values are shown in Table 1.
Wherein:
the weight ratio of the fly ash, the silica gel powder and the talcum powder in the fine powder additive is 46:24: 22.
The weight ratio of the broken stone particles to the ceramic particles in the coarse aggregate is as follows: 725:555.
Example 8
Compared with the concrete in the embodiment 3, the concrete has different weight ratios of the fly ash, the silica gel powder and the talcum powder, and the detailed numerical values are shown in the table 1.
Wherein:
the weight ratio of the fly ash, the silica gel powder and the talcum powder in the fine powder additive is 47.2:22.4: 22.4.
The weight ratio of the crushed stone particles to the ceramic particles in the coarse aggregate is 720: 560.
Comparative example 1
Compared with the concrete in the example 3, the concrete replaces the mineral powder with fine powder additives by weight, and the detailed numerical values are shown in the table 1.
Comparative example 2
Compared with the concrete in the example 3, the concrete has the advantages that the fine sand and other mass are replaced by coarse aggregate, and the detailed numerical value is shown in the table 1.
Wherein:
the weight part of the fine sand was replaced with crushed stone particles and ceramic particles according to the weight ratio of crushed stone particles and ceramic particles in example 3, and the weight ratio of crushed stone particles and ceramic particles in comparative example 2 was 828: 644.
Comparative example 3
Compared with the embodiment 3, the preparation method of the permeable compression-resistant concrete has the following differences, and comprises the following steps: s1: the fly ash, silica gel powder, talcum powder, coarse aggregate, fine sand, cement, water reducing agent and water are sequentially put into a stirrer and uniformly stirred.
Table 1: indication table of weight parts of each component of permeable compression-resistant concrete
Performance testing
The concrete samples obtained in the examples and comparative examples were subjected to a compressive strength test, wherein the concrete samples were cubes of 15cm × 15cm × 15cm, three in each set, and cured by a standard method (temperature 20 ℃ ± 2 ℃, relative humidity 95% RH or more) after molding. The resulting performance results are shown in table 2.
Table 2: compressive strength performance detection data table
The concrete produced in each example and comparative example was subjected to a water permeability test. The concrete prepared in each of the examples and comparative examples was processed into cylindrical test pieces having a diameter of 100mm and a height of 50mm, three pieces being provided for each set. Curing the formed concrete according to a standard method (the temperature is 20 +/-2 ℃ and the relative humidity is more than 95 percent RH), and finally measuring the water permeability coefficient according to GJJ/T135-2009 permeable cement concrete pavement technical specification. The resulting performance results are shown in table 3.
Table 3: permeability coefficient detection data table
Analysis of results
By combining the performance test data of the example 3 and the comparative example 1, it can be seen that after the fine powder additive and the like are replaced by mineral powder, the compressive strength of the prepared concrete is obviously reduced, and the water permeability coefficient is not greatly improved. Therefore, it is known that the addition of the fine powder additive to the concrete greatly enhances the compressive properties of the prepared concrete while maintaining the water permeability of the concrete. On one hand, silica gel powder, fly ash and talcum powder in the fine powder additive enable gaps among the coarse aggregates to be separated without influencing the effective porosity of the concrete, so that the connection strength among the coarse aggregates is enhanced, and meanwhile, the water permeability of the concrete is maintained. On the other hand, the adsorption performance of the silica gel powder is convenient for adsorbing the fly ash and the talcum powder, and redundant gaps in the concrete are easily filled, so that the compression resistance of the concrete is improved.
The silica gel powder also has a porous structure, and has water permeability while improving the connection performance of coarse aggregate. The talcum powder in the fine powder additive improves the stirring smoothness when the concrete is stirred, is convenient to process the concrete and is convenient to manufacture the pervious compression-resistant concrete.
By combining the performance detection data of the embodiment 3 and the comparative example 2, it can be seen that after the fine sand and other masses are replaced by the coarse aggregate, the compressive strength of the formed concrete test block is greatly reduced, and the water permeability coefficient is not greatly improved. Therefore, the fine sand can greatly improve the compression resistance of the concrete while maintaining the water permeability of the concrete. The fine sand is convenient for filling the redundant gaps of the coarse aggregates, so that the connection strength between the coarse aggregates is improved, and the compression resistance of the concrete is improved. Meanwhile, small gaps are reserved among the fine sands, so that the water permeability of the concrete is maintained conveniently.
It can be seen by combining the performance test data of example 3 and example 7 that when the weight ratio of the crushed stone particles to the ceramic particles in the coarse aggregate is set to 725:555, i.e., 1.3:1, the water permeability and the compressive property of the concrete are both improved to a certain extent. Due to the irregularity of the ceramic particles, larger gaps are convenient to provide, but the connection performance between the corresponding coarse aggregates is influenced, so that the use ratio of the ceramic particles is controlled, and the compression resistance and the water permeability of the concrete can be further improved.
Combining the performance test data of example 3 and example 8, it can be seen that the weight ratio of the fly ash, the silica gel powder and the talcum powder in the fine powder additive is set to 47.2:22.4:22.4, i.e. 2.1: 1:1 hour, the compressive property and the water permeability of the concrete are improved to a certain extent.
It can be seen from the performance test data of example 3 and comparative example 3 that the steps disclosed in example 3 are adopted to facilitate uniform mixing of the fine powder additive, facilitate uniform filling of the powder in the fine powder additive in the gaps between the coarse aggregates, facilitate mutual bonding of the silica gel powder, the fly ash and the talc, and facilitate filling of the redundant gaps between the coarse aggregates, thereby improving the compression resistance of the concrete. Meanwhile, the possibility that the fine powder additive is matched with fine sand and cement to directly block the gap between coarse aggregates is not easy to exist, and the water permeability of the step disclosed in the embodiment 3 is better.
The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.
Claims (8)
1. The permeable compression-resistant concrete is characterized in that: the composition comprises the following components in parts by weight:
coarse aggregate: 1050-;
fine sand: 160-220 parts;
cement: 150-210 parts;
water: 140 portions and 190 portions;
fine powder additive: 80-105 parts of a modifier;
water reducing agent: 3.1-4.25 parts;
the coarse aggregate comprises broken stone particles and ceramic particles, and the fine powder additive comprises fly ash, silica gel powder and talcum powder.
2. The water permeable compression-resistant concrete as claimed in claim 1, wherein: the weight ratio of the fly ash to the silica gel powder to the talcum powder is (40-50): (20-30): (18-27).
3. The water permeable compression-resistant concrete as claimed in claim 1, wherein: the weight ratio of the crushed stone particles to the ceramic particles is (600-800): (450-700).
4. The water permeable compression-resistant concrete as claimed in claim 1, wherein: the particle sizes of the broken stone particles and the ceramic particles are both 5-15mm, and the particle size of the fine sand is 0.2-0.25 mm.
5. The water permeable compression-resistant concrete as claimed in claim 1, wherein: the cement comprises at least one of Portland cement, aluminate cement and sulphoaluminate cement.
6. The water permeable compression-resistant concrete as claimed in claim 1, wherein: the solid content of the water reducing agent is 20%, and the water reducing rate is more than 30%.
7. The method for preparing water permeable compression resistant concrete according to any one of claims 1 to 6, wherein: the method comprises the following steps:
s1: mixing and stirring the fly ash, the silica gel powder and the talcum powder to prepare a fine powder additive;
s2: and sequentially putting the coarse aggregate, the fine sand, the cement, the water reducing agent, the water and the fine powder additive prepared in the S1 into a stirrer to be uniformly stirred to prepare the permeable compression-resistant concrete.
8. The method for preparing water permeable compression resistant concrete according to claim 7, wherein the method comprises the following steps: the S2 specifically includes:
s21: firstly, fine sand, coarse aggregate, cement and a water reducing agent are put into a stirrer to be uniformly stirred to form a primary mixed material;
s22: pouring 70% of the required water into a stirrer, and further uniformly stirring the primary mixed material;
s23: adding the fine powder additive prepared in the step S1 into a stirrer, adding the rest 30 percent of water, and uniformly stirring by the stirrer to prepare the permeable compression-resistant concrete.
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| CN116589256A (en) * | 2023-06-01 | 2023-08-15 | 安徽建筑大学 | Ultra-high performance concrete spray material for facing and processing equipment thereof |
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