CN112456928A - High-strength anti-permeability concrete and preparation method thereof - Google Patents
High-strength anti-permeability concrete and preparation method thereof Download PDFInfo
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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
- C04B28/06—Aluminous cements
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28C5/00—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions
- B28C5/003—Methods for mixing
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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
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
- C04B18/06—Combustion residues, e.g. purification products of smoke, fumes or exhaust gases
- C04B18/08—Flue dust, i.e. fly ash
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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
- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/60—Agents for protection against chemical, physical or biological attack
- C04B2103/65—Water proofers or repellants
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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
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/27—Water resistance, i.e. waterproof or water-repellent materials
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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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- Chemical & Material Sciences (AREA)
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- Environmental & Geological Engineering (AREA)
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Abstract
The application relates to the technical field of concrete, and particularly discloses high-strength anti-permeability concrete and a preparation method thereof. The high-strength impervious concrete comprises the following components in parts by weight: 200 portions and 300 portions of sulphoaluminate cement; 5-10 parts of a seepage-resistant waterproof agent; 900 portions of fine stone; 700 portions of sand and 800 portions of sand; 5-10 parts of a water reducing agent; 200 portions of water and 250 portions of water; 5-7 parts of an air entraining agent; 100 portions of fly ash and 200 portions of fly ash; the impervious waterproof agent comprises the following components of EVA redispersible latex powder, water, sodium methylsiliconate, hydrochloric acid, silicon dioxide and calcium oxide. The preparation method comprises the following steps: mixing sulphoaluminate cement, sand, fine stone and fly ash to obtain a mixture A; adding a water reducing agent, an anti-seepage waterproofing agent and an air entraining agent into water and mixing to obtain a mixture B; adding the mixture B into the mixture A, and stirring and mixing. The high-strength anti-permeability concrete prepared by the application has better anti-permeability capability and also has the advantages of high strength and the like.
Description
Technical Field
The application relates to the technical field of concrete, in particular to high-strength anti-permeability concrete and a preparation method thereof.
Background
The concrete is artificial stone which is prepared by taking cement as a main cementing material, mixing water, sand, fine stone, chemical additives and mineral admixtures if necessary, uniformly stirring, densely molding, curing and hardening. The concrete has the characteristics of rich raw materials, low cost and simple production process, and meanwhile, the concrete also has good plasticity and higher strength, so the application of the concrete is increasingly wide. The common concrete has more pores after being cured, and has poor durability due to large water permeability in the environments such as dams, mines, canals and the like which need to be soaked for a long time.
In the related art, a common method for producing impervious concrete is to mix an air-entraining additive, so that air bubbles which are not communicated are generated in the concrete, a capillary channel is cut off, and a pore structure is changed, thereby improving the impermeability of the concrete.
In view of the above-mentioned related technologies, the inventor believes that, when concrete is applied in a water-soaked environment, the anti-permeability concrete produced in the related technologies has limited waterproof and anti-permeability capabilities, cannot achieve a good anti-permeability effect, greatly reduces the service life of the concrete, and needs to improve the anti-permeability capability of the concrete.
Disclosure of Invention
In order to improve the impermeability of concrete, the application provides high-strength impermeable concrete and a preparation method thereof.
In a first aspect, the present application provides a high-strength impervious concrete, which adopts the following technical scheme:
the high-strength impervious concrete comprises the following components in parts by weight:
200 portions and 300 portions of sulphoaluminate cement;
5-10 parts of a seepage-resistant waterproof agent;
900 portions of fine stone;
700 portions of sand and 800 portions of sand;
5-10 parts of a water reducing agent;
200 portions of water and 250 portions of water;
5-7 parts of an air entraining agent;
100 portions of fly ash and 200 portions of fly ash;
the impervious waterproof agent comprises the following components in parts by weight,
30-40 parts of EVA re-dispersible latex powder;
100 portions of water and 200 portions of water;
2-12 parts of sodium methylsiliconate;
1-6 parts of hydrochloric acid;
20-30 parts of silicon dioxide;
40-50 parts of calcium oxide.
By adopting the technical scheme, the sulphoaluminate cement is used as a main bonding material and is mainly used for bonding sand and fine stone, and the sulphoaluminate cement, the sand and the fine stone are jointly used as main raw materials of concrete. The air entraining agent can introduce a large amount of micro closed bubbles when the concrete is stirred, and reduce the surface tension of the concrete mixture, thereby changing the workability of the concrete mixture and simultaneously improving the strength of the concrete. Due to the obstruction of the air bubbles, the evaporation route of free water in the concrete becomes tortuous, fine and dispersed, and the water seepage passage of the concrete is reduced, so that the impermeability of the concrete is improved.
The fly ash can be used for filling gaps, the permeability of chloride ions in concrete can be reduced by doping the fly ash, the structure of the concrete is compact, and the anti-permeability effect is achieved.
The EVA redispersible latex powder is mixed with water and rapidly dispersed into an EVA emulsion, and the EVA emulsion has good flexibility, acid and alkali resistance, miscibility and film forming property and is widely used as a modifier of cement. Calcium oxide forms calcium salt solution under the action of hydrochloric acid, and has obvious effect on refining concrete pores, so that the concrete has good anti-permeability and waterproof performance. The calcium oxide can also adjust the expansion speed of the concrete and compensate the temperature change and shrinkage of the concrete. The silicon dioxide has stronger surface tension, can absorb a large amount of water molecules, and improves the anti-permeability capability of the concrete. The sodium methylsiliconate is easily decomposed into methylsilicic acid by hydrochloric acid, and the polymerization reaction is made to produce the water-proof polymethyl silyl ether. Meanwhile, the methyl silicic acid can react with calcium ions to generate a complex with a net structure, so that the impermeability of the concrete is improved.
Preferably, the concentration of the hydrochloric acid is 2-3 mol/L.
By adopting the technical scheme, the diluted hydrochloric acid with the concentration of 2-3mol/L can better react with calcium oxide and sodium methylsilanolate, and the impermeability of the concrete is improved.
Preferably, the impervious waterproofing agent is prepared by the following steps:
a, weighing the components according to the proportion;
b, uniformly mixing the weighed EVA redispersible latex powder with water to obtain a mixed solution;
and c, adding silicon dioxide, calcium oxide, sodium methylsiliconate and hydrochloric acid into the mixed solution, and uniformly stirring to obtain the impervious waterproofing agent.
By adopting the technical scheme, the EVA redispersible latex powder is uniformly mixed with water to prepare the EVA emulsion, and then the silicon dioxide, the calcium oxide, the sodium methylsiliconate and the hydrochloric acid are added into the EVA emulsion and stirred to prepare the anti-permeability waterproof agent. The prepared anti-permeability waterproofing agent has good dispersibility of all components by mixing in steps, and the anti-permeability capability of the concrete is improved by adding the anti-permeability waterproofing agent into the concrete.
Preferably, in the step c, the stirring speed is set to be 200-300rpm, and the stirring time is set to be 20-30 min.
By adopting the technical scheme, the raw materials of the anti-permeability waterproofing agent are stirred for 20-30min at the rotating speed of 200-300rpm, so that the dispersibility of the raw materials in the mixed solution is improved, and the mixing is more sufficient.
Preferably, the air entraining agent is prepared from rosin powder and sodium alkyl benzene sulfonate in a weight ratio of 1: (1.3-2.6) mixing.
By adopting the technical scheme, the air entraining agent formed by mixing the rosin powder and the sodium alkyl benzene sulfonate has better performance, the quantity of bubbles introduced during concrete stirring is increased, the bubbles are uniformly dispersed in the concrete mixture, and the impermeability and the strength of the concrete mixture are improved.
Preferably, the water reducing agent comprises one or more of a naphthalene-based high-efficiency water reducing agent, an aliphatic high-efficiency water reducing agent and a polycarboxylic acid high-efficiency water reducing agent.
By adopting the technical scheme, the concrete water reducing agent is added, the water consumption is reduced under the condition that the proportion of various raw materials and the slump of the concrete are not changed, the strength of the concrete can be greatly improved, and meanwhile, the service life of the concrete can be prolonged by adding the water reducing agent.
Preferably, the sand is natural medium sand in a zone II, the fineness modulus is 2.5, the mud content is less than 1.0 percent, the fine stone is crushed stone with the grain diameter of 5-20mm in continuous gradation, and the density of the fly ash is 2.57g/cm3Fineness of 6.4%, loss on ignition of 3.0% and water demand ratio of 92.0%.
By adopting the technical scheme, the sand is natural medium sand in the area II and is used as fine aggregate, and the fine stone is 5-20mm continuous gradation and is used as coarse aggregate. The sand and the broken stone with different particle diameters can be stacked to form a dense and filled lap joint framework, so that the porosity of the concrete is reduced, the strength of the concrete is improved, the impermeability of the concrete is improved, and meanwhile, the workability of the concrete is enhanced. The fly ash can be filled in the gap between the sand and the broken stone, so that the impermeability and the strength of the concrete are further improved.
In a second aspect, the application provides a preparation method of high-strength impervious concrete, which adopts the following technical scheme:
a preparation method of high-strength impervious concrete comprises the following steps:
s1, fully mixing sulphoaluminate cement, sand and fine stone to obtain a mixture A;
s2, adding the water reducing agent, the anti-seepage waterproofing agent and the air entraining agent into water, stirring and mixing to obtain a mixture B;
s3, adding the mixture B into the mixture A and mixing the mixture A with continuous stirring.
By adopting the technical scheme, the raw materials are stirred in multiple steps, so that the sulphoaluminate cement can better bond sand and fine stones, the dispersibility of each raw material component in a concrete mixture is improved, and the impermeability and strength of the concrete are improved.
Preferably, in the step S3, the stirring temperature is set to be 40-50 ℃, and the stirring time is set to be 1-2 h.
By adopting the technical scheme, the mixture B is fully stirred in a better temperature range when being stirred, so that all the components are fully mixed in the mixture.
In summary, the present application has the following beneficial effects:
1. in the anti-permeability waterproof agent added in the application, calcium oxide forms calcium salt solution under the action of hydrochloric acid, so that concrete pores are refined, and the concrete has good anti-permeability waterproof performance; the silicon dioxide can adsorb a large amount of water molecules, so that the impermeability of the concrete is improved; the sodium methylsilanolate is decomposed into methylsilicic acid by hydrochloric acid, and a polymerization reaction is carried out to generate polymethylsilyl ether with waterproof performance, and simultaneously, the methylsilicic acid reacts with calcium ions to generate a complex with a net structure, so that the impermeability of the concrete is improved;
2. the fly ash and the water reducing agent are mixed to further reduce the slump and the fluidity of the concrete and increase the compactness of the concrete, so that the impermeability and the chemical corrosion resistance of the concrete are improved;
3. according to the method, the raw materials of the concrete are mixed by stirring step by step, so that the components have good dispersibility in the concrete mixture, and the impermeability and strength of the concrete are improved.
Detailed Description
The present application will be described in further detail with reference to examples.
The sulphoaluminate cement adopted in the embodiment of the application is collected from a Lufeng Qingqing waterproof material factory;
the sand adopts natural medium sand in the area II, the fineness modulus is 2.5, the mud content is less than 1.0 percent, and the sand is used as fine aggregate;
the fine stones are crushed stones with the grain size of 5-20mm in continuous gradation as coarse aggregates;
the fly ash is collected from Lingshou county Xin Tuo mineral processing Co., Ltd, and the density is 2.57g/cm3Fineness of 6.4%, loss on ignition of 3.0% and water demand ratio of 92.0%;
the polycarboxylic acid high-efficiency water reducing agents are all adopted from Shandong HanLinjun International trade limited;
the aliphatic high-efficiency water reducing agent is obtained from Dongguan large-volume building material Co.Ltd;
the naphthalene series high-efficiency water reducing agents are all obtained from Jinan Hui Chuan chemical Co.
The stirrer is a chemical stirrer produced by Qingzhou city and Liyuan building material machinery factories.
Preparation examples of raw materials
Preparation example 1: a water-repellent agent having the components and their respective weights shown in Table 1, which is obtained by the following steps,
weighing the components according to the proportion, wherein dilute hydrochloric acid with the concentration of 2mol/L is adopted as hydrochloric acid;
b, uniformly mixing the weighed EVA re-dispersible latex powder and water in a stirrer to obtain a mixed solution;
and c, adding silicon dioxide, calcium oxide, sodium methylsiliconate and hydrochloric acid into the mixed solution, and uniformly stirring to obtain the anti-seepage waterproof agent, wherein the stirring speed is set to be 200rpm, and the stirring time is set to be 20 min.
Preparation examples 2 to 3: a water-repellent, impervious agent differing from that of preparation example 1 in that each component and the corresponding weight thereof are shown in Table 1.
TABLE 1 Components and weights (kg) thereof in preparation examples 1-3
Preparation example 4: a permeation-resistant waterproofing agent differing from that of production example 1 in that dilute hydrochloric acid having a concentration of 2.5mol/L was used as hydrochloric acid.
Preparation example 5: a permeation-resistant waterproofing agent differing from that of production example 1 in that dilute hydrochloric acid having a concentration of 3mol/L was used as hydrochloric acid.
Preparation example 6: a water-repellent, impervious to water, differing from that of preparation example 1 in that the stirring speed in c was set to 250rpm and the stirring time was set to 25 min.
Preparation example 7: a water-repellent, impervious to water, differing from that of preparation example 1 in that the stirring speed in c was set to 300rpm and the stirring time was set to 30 min.
Examples
Example 1: a high-strength impervious concrete, the components and the corresponding weight of which are shown in Table 2, is prepared by the following steps,
s1, fully mixing sulphoaluminate cement, sand, fine stone and fly ash to obtain a mixture A;
s2, adding the water reducing agent, the anti-seepage waterproofing agent and the air entraining agent into water, stirring and mixing to obtain a mixture B;
s3, adding the mixture B into the mixture A, and continuously stirring and mixing for 1h at 40 ℃.
Wherein the water-repellent agent obtained in preparation example 1 was used as the water-repellent agent; the air entraining agent is prepared from rosin powder and sodium alkyl benzene sulfonate according to the weight ratio of 1: 1.3 mixing to obtain; the water reducing agent is a polycarboxylic acid high-efficiency water reducing agent which is collected from Shandong HanLin Jun International trade company Limited.
Examples 2 to 6: a high-strength impervious concrete, which is different from example 1 in that the components and their respective weights are shown in table 2.
TABLE 2 Components and weights (kg) thereof in examples 1-6
Example 7: a high-strength impervious concrete differing from example 1 in that the impervious waterproofing agent prepared in preparation example 2 was used.
Example 8: a high-strength impervious concrete differing from example 1 in that the impervious waterproofing agent prepared in preparation example 3 was used.
Example 9: a high-strength impervious concrete differing from example 1 in that the impervious waterproofing agent prepared in preparation example 4 was used.
Example 10: a high-strength impervious concrete differing from example 1 in that the impervious waterproofing agent prepared in production example 5 was used.
Example 11: a high-strength impervious concrete differing from example 1 in that the impervious waterproofing agent obtained in preparation example 6 was used.
Example 12: a high-strength impervious concrete differing from example 1 in that the impervious waterproofing agent prepared in production example 7 was used.
Example 13: the high-strength impervious concrete is different from the concrete in example 1 in that an air entraining agent is prepared from rosin powder and sodium alkyl benzene sulfonate in a weight ratio of 1: 2, mixing the components.
Example 14: the high-strength impervious concrete is different from the concrete in example 1 in that an air entraining agent is prepared from rosin powder and sodium alkyl benzene sulfonate in a weight ratio of 1: 2.6 mixing to obtain the product.
Example 15: a high-strength impermeable concrete, which is different from that of example 1, was characterized in that in S3, the stirring temperature was set to 45 ℃ and the stirring time was set to 1.5 hours.
Example 16: a high-strength impermeable concrete, which is different from that of example 1, was characterized in that the stirring temperature was set to 50 ℃ and the stirring time was set to 2 hours in S3.
Example 17: a high-strength impervious concrete is different from that in example 2 in that a water reducing agent is formed by mixing 3kg of a naphthalene-based superplasticizer and 3kg of a polycarboxylic acid superplasticizer.
Example 18: the difference between the high-strength impervious concrete and the concrete in example 2 is that the water reducing agent is formed by mixing 2kg of naphthalene-based high-efficiency water reducing agent, 2kg of polycarboxylic acid high-efficiency water reducing agent and 2kg of aliphatic high-efficiency water reducing agent.
Comparative example
Comparative example 1: a concrete which differs from that of example 1 in that no permeation-resistant waterproofing agent is added.
Comparative example 2: a concrete, which is different from that of example 1 in that no fly ash was added in the preparation of the impervious waterproofing agent.
Comparative example 3: a concrete, which is different from example 1 in that sodium methylsiliconate was not added in the preparation of the water-proofing agent for impermeability.
Comparative example 4: a concrete, which is different from example 1 in that the concentration of hydrochloric acid in the preparation of the impervious waterproofing agent was 1 mol/L.
Comparative example 5: a concrete, which is different from example 1 in that the concentration of hydrochloric acid in the preparation of the impervious waterproofing agent was 4 mol/L.
Comparative example 6: a concrete, which is different from example 1 in that the impervious waterproofing agent was prepared in such a manner that the stirring speed was set to 100rpm and the stirring time was set to 10min in c.
Comparative example 7: a concrete, which is different from example 1 in that the impervious waterproofing agent was prepared in such a manner that the stirring speed was set to 400rpm and the stirring time was set to 40min in c.
Comparative example 8: the concrete is different from the concrete in example 1 in that the air entraining agent is prepared from rosin powder and sodium alkyl benzene sulfonate in a weight ratio of 1: 1, mixing to obtain the product.
Comparative example 9: the concrete is different from the concrete in example 1 in that the air entraining agent is prepared from rosin powder and sodium alkyl benzene sulfonate in a weight ratio of 1: 3, mixing the components.
Comparative example 10: a concrete, which is different from example 1 in that in S3, the stirring temperature was set to 30 ℃ and the stirring time was set to 0.5 hour.
Comparative example 11: a concrete, which is different from example 1 in that in S3, the stirring temperature was set to 60 ℃ and the stirring time was set to 3 hours.
Performance test
The concrete prepared in examples 1 to 18 and comparative examples 1 to 11 were used as test objects, and the water permeation resistance, the chloride ion permeation resistance, the compressive strength and the slump were measured.
The water penetration resistance is tested according to a step-by-step pressurization method in GB/T50082-2009 Standard test method standards for the long-term performance and durability of ordinary concrete.
The chloride ion penetration resistance is tested according to the rapid chloride ion migration coefficient method in GB/T50082-2009 test method Standard for the long-term performance and durability of ordinary concrete.
The compressive strength is tested according to GB/T50081 and 2019 standard of mechanical property test method of common concrete, and a cubic standard test piece with the specification of 150 multiplied by 150mm is selected as a test sample.
Slump the slump of the concrete mixture is tested for 30min according to GB/T50080-2016 Standard test method for Performance of common concrete mixtures.
The test results are shown in table 3 below.
As can be seen from the test data in table 3:
the concrete standard test pieces or the standard test blocks prepared in the examples 1 to 18 have the water penetration depth of less than 5.5mm, the chloride ion penetration depth of less than 3.0mm, the compressive strength of more than 38MPa and the slump of less than 108 mm. Among them, examples 3 and 4 are the most preferable examples, and the concrete obtained has the best impermeability.
By combining example 1 and comparative example 1 and table 3, it can be seen that the addition of the anti-permeability waterproofing agent can effectively improve the anti-permeability capability of concrete and reduce the slump of concrete mixture, and meanwhile, the compressive strength of the concrete prepared by adding the anti-permeability waterproofing agent is slightly improved.
By combining the example 1 and the comparative example 2 and combining the table 3, it can be seen that the incorporation of the fly ash can reduce the permeability of chloride ions in the concrete, so that the structure of the concrete is compact, the effect of impermeability is achieved, and meanwhile, the mechanical properties of the concrete are improved.
Combining example 1 and comparative example 3, and table 3, it can be seen that the incorporation of sodium methylsiliconate can significantly improve the impermeability of concrete.
By combining examples 1, 9 and 10 and comparative examples 4 and 5, and by combining table 3, it can be seen that the concentration range of hydrochloric acid is preferably 2-3mol/L during the preparation of the impervious waterproofing agent, and the impervious performance of concrete is improved significantly by using the prepared impervious waterproofing agent.
Combining examples 1, 11 and 12 and comparative examples 6 and 7, and combining Table 3, it can be seen that the stirring speed was set to 200 and 300rpm and the stirring time was set to 20-30min during the preparation of the permeation-resistant waterproofing agent.
In combination with examples 1, 13 and 14 and comparative examples 8 and 9, and in combination with table 3, it can be seen that the air entraining agent composed of a mixture of rosin powder and sodium alkylbenzenesulfonate can improve the impermeability of concrete, wherein the preferred weight ratio of rosin powder to sodium alkylbenzenesulfonate is 1: (1.3-2.6).
In combination with examples 1, 15 and 16 and comparative examples 10 and 11, and in combination with Table 3, it can be seen that the preferred range of mixing temperature is 40-50 ℃ and the preferred range of mixing time is 1-2 hours during the preparation of concrete.
Table 3 results of performance testing
The present embodiment is only for explaining the present application, and it is not limited to the present application, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present application.
Claims (9)
1. The high-strength impervious concrete is characterized by comprising the following components in parts by weight:
200 portions and 300 portions of sulphoaluminate cement;
5-10 parts of a seepage-resistant waterproof agent;
900 portions of fine stone;
700 portions of sand and 800 portions of sand;
5-10 parts of a water reducing agent;
200 portions of water and 250 portions of water;
5-7 parts of an air entraining agent;
100 portions of fly ash and 200 portions of fly ash;
the impervious waterproof agent comprises the following components in parts by weight:
30-40 parts of EVA re-dispersible latex powder;
100 portions of water and 200 portions of water;
2-12 parts of sodium methyl silanol;
1-6 parts of hydrochloric acid;
20-30 parts of silicon dioxide;
40-50 parts of calcium oxide.
2. The high strength, impervious concrete according to claim 1, wherein said hydrochloric acid concentration is 2-3 mol/L.
3. The high strength impervious concrete according to claim 1, wherein said impervious waterproofing agent is prepared by the steps of:
a, weighing the components according to the proportion;
b, uniformly mixing the weighed EVA redispersible latex powder with water to obtain a mixed solution;
and c, adding silicon dioxide, calcium oxide, sodium methylsiliconate and hydrochloric acid into the mixed solution, and uniformly stirring to obtain the impervious waterproofing agent.
4. The high strength impervious concrete according to claim 3, wherein in said c, the stirring speed is set to 200-300rpm, and the stirring time is set to 20-30 min.
5. The high-strength impervious concrete according to claim 1, wherein said air entraining agent is prepared from rosin powder and sodium alkyl benzene sulfonate in a weight ratio of 1: (1.3-2.6) mixing.
6. The high-strength impervious concrete according to claim 1, characterized in that said water-reducing agent comprises one or more of naphthalene based superplasticizer, aliphatic superplasticizer and polycarboxylic acid superplasticizer.
7. The high-strength impervious concrete according to claim 1, wherein the sand is natural medium sand in area II, the fineness modulus is 2.5, the mud content is less than 1.0 percent, the fine stone is crushed stone with a continuous gradation of 5-20mm in particle size, and the fly ash density is 2.57g/cm3Fineness of 6.4%, loss on ignition of 3.0% and water demand ratio of 92.0%.
8. The method of preparing a high strength, impervious concrete according to any one of claims 1 to 7 comprising the steps of:
s1, fully mixing sulphoaluminate cement, sand, fine stone and fly ash to obtain a mixture A;
s2, adding the water reducing agent, the anti-seepage waterproofing agent and the air entraining agent into water, stirring and mixing to obtain a mixture B;
s3, adding the mixture B into the mixture A and mixing the mixture A with continuous stirring.
9. The method according to claim 8, wherein the stirring temperature of S3 is 40-50 ℃, and the stirring time is 1-2 h.
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