CN108164182B - Environment-friendly high-permeability-resistance anti-cracking agent - Google Patents
Environment-friendly high-permeability-resistance anti-cracking agent Download PDFInfo
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- CN108164182B CN108164182B CN201810019011.2A CN201810019011A CN108164182B CN 108164182 B CN108164182 B CN 108164182B CN 201810019011 A CN201810019011 A CN 201810019011A CN 108164182 B CN108164182 B CN 108164182B
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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
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/02—Treatment
- C04B20/023—Chemical treatment
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Abstract
The invention discloses an environment-friendly high-permeability-resistance anti-cracking agent, which comprises the following raw materials: the expansion clinker, anhydrite, calcined coal gangue, zeolite powder, magnesium oxide, a water-retaining agent, a water reducing agent, polyethylene glycol, sodium gluconate and sodium stearate. The environment-friendly high-impermeability anti-cracking agent has the functions of cracking resistance, impermeability, shrinkage compensation and the like, and effectively improves the compactness of concrete and compensates the shrinkage of concrete, thereby improving the impermeability and anti-cracking performance. Meanwhile, the high-permeability-resistance anti-cracking agent is non-toxic and harmless, has no corrosion effect on reinforcing steel bars, is environment-friendly, and meets the increasingly-improved environmental protection requirements.
Description
Technical Field
The invention relates to an environment-friendly high-permeability-resistance anti-cracking agent, and belongs to the technical field of building materials.
Background
For the concrete-based building, because the concrete can generate the drying shrinkage, and the external temperature change can also generate the influence on the building, the concrete-based building can be cracked. This is because the concrete undergoes a volume reduction phenomenon at the initial stage of setting or during hardening, and shrinkage stress is generated inside the structure, which stress, when exceeding the tensile strength of the concrete, causes the concrete to crack and form shrinkage cracks. In order to prevent and alleviate the temperature shrinkage cracks of the ultra-long concrete structure, the effective arrangement of the post-cast strip is a conventional measure, but the post-cast strip prolongs the construction period, the overlapping, welding and cleaning and roughening after the steel bars are broken all bring certain troubles to the joint filling construction, and the hidden trouble is left after the treatment is not good. Therefore, it is necessary to compensate the temperature and shrinkage tensile stress generated in the concrete during hardening process by using the expansion effect of the shrinkage-compensating concrete during hardening process and generating a small amount of pre-compressive stress in the structure, thereby preventing shrinkage cracks or controlling cracks within the range of harmless cracks.
In the prior art, an expanding agent is generally added into concrete to improve the crack resistance and the impermeability of the concrete, realize self-waterproofing of the structure and contribute to improving the sulfate corrosion resistance and the alkali-aggregate reaction resistance of the concrete to a certain extent. However, the use of the expanding agent still cannot be adapted to the strength development of concrete, and the like, and the crack resistance and the impermeability of the concrete are to be improved.
Aiming at the defects and shortcomings of the prior art, the invention aims to provide an environment-friendly high-impermeability anti-cracking agent which is used for compensating the shrinkage of concrete, improving the working performance of the concrete, improving the compactness, realizing self-waterproofing and improving the anti-cracking performance and the impermeability of the concrete.
Disclosure of Invention
The invention aims to solve the problem of providing the environment-friendly high-permeability-resistance anti-cracking agent, the obtained environment-friendly high-permeability-resistance anti-cracking agent is small in later shrinkage, and the prepared concrete is high in compressive strength.
The invention provides an environment-friendly high-permeability-resistance anti-cracking agent, which comprises the following raw materials: the expansion clinker, anhydrite, calcined coal gangue, zeolite powder, magnesium oxide, a water-retaining agent, a water reducing agent, polyethylene glycol, sodium gluconate and sodium stearate.
Preferably, the environment-friendly high-permeability-resistance crack-resistant agent comprises the following raw materials: the composite material comprises expansion clinker, anhydrite, calcined coal gangue, modified zeolite powder, magnesium oxide, a water-retaining agent, a water reducing agent, polyethylene glycol, sodium gluconate and sodium stearate.
More preferably, the environment-friendly high-permeability-resistance anti-cracking agent comprises the following raw materials in parts by weight: 15-25 parts of expansion clinker, 25-35 parts of anhydrite, 20-30 parts of calcined coal gangue, 10-20 parts of modified zeolite powder, 2-5 parts of magnesium oxide, 2-5 parts of water retention agent, 1-3 parts of water reducing agent, 0.5-1.5 parts of polyethylene glycol, 0.1-1 part of sodium gluconate and 0.1-1 part of sodium stearate.
The water-retaining agent is one or a mixture of two of methylcellulose, hydroxypropyl methylcellulose, polyacrylamide and sodium polyacrylate.
Preferably, the water-retaining agent is one or a mixture of two of hydroxypropyl methyl cellulose and sodium polyacrylate.
More preferably, the water retaining agent is a mixture of hydroxypropyl methyl cellulose and sodium polyacrylate, and the mass ratio of the hydroxypropyl methyl cellulose to the sodium polyacrylate is (1-10): 1.
The water reducing agent is one of naphthalene series, sulfamate series, aliphatic series and polycarboxylic acid series water reducing agents.
Preferably, the water reducing agent is a polycarboxylic acid water reducing agent.
Preferably, the dosage of the environment-friendly high-permeability-resistance anti-cracking agent in the concrete is 6-14% of the dosage of the gel material.
The expansion clinker is calcium sulphoaluminate expansion clinker, can adopt commercially available calcium sulphoaluminate expansion clinker, and can also be prepared.
The preparation method of the expanded clinker is obtained by the method in the example (1) with the application number of 02103899.6.
The preparation method of the modified zeolite powder comprises the following steps:
(1) placing the zeolite powder in a muffle furnace, roasting for 2-4 hours at the temperature of 400-600 ℃, naturally cooling to room temperature, and sieving with a 300-mesh sieve to obtain activated zeolite powder;
(2) activated zeolite powder and 0.5mol/L titanium sulfate aqueous solution are mixed according to the solid-to-liquid ratio of 1 g: (10-20) mL, stirring at 20-30 ℃ for 40-60 minutes at 300 r/min of 100-;
(3) mixing gamma-glycidoxypropyltrimethoxysilane and water in a volume ratio of 5: (95-105), stirring at the temperature of 75-85 ℃ for 20-40 minutes at the speed of 100-300 r/min to obtain a mixed solution, and mixing the inorganic modified zeolite powder and the mixed solution according to the solid-to-liquid ratio of 1 g: (10-20) mL, stirring at 200-60 ℃ for 1-3 hours at 500 rpm, centrifuging at 3000-5000 rpm for 10-20 minutes, washing the obtained solid with deionized water 20-30 times the mass of the inorganic modified zeolite powder for 1-5 times, and drying the cleaned zeolite powder at 100-110 ℃ for 2-4 hours to obtain the modified zeolite powder.
The invention also provides a preparation method of the environment-friendly high-permeability-resistance anti-cracking agent, which comprises the following steps:
(1) drying the expanded clinker, the anhydrite, the calcined coal gangue, the modified zeolite powder and the magnesium oxide at the temperature of 100 ℃ and 110 ℃ for 2-4 hours;
(2) adding the raw materials dried in the step (1) into a pulverizer, and pulverizing to 300 meshes to obtain mixed powder;
(3) adding the water-retaining agent, the water reducing agent, the polyethylene glycol, the sodium gluconate and the sodium stearate into the mixed powder, and continuously grinding to 300 meshes to obtain the environment-friendly high-permeability-resistant anti-cracking agent.
The environment-friendly high-impermeability anti-cracking agent has the functions of cracking resistance, impermeability, shrinkage compensation and the like, and effectively improves the compactness of concrete and compensates the shrinkage of concrete, thereby improving the impermeability and anti-cracking performance. Meanwhile, the high-permeability-resistance anti-cracking agent is non-toxic and harmless, has no corrosion effect on reinforcing steel bars, is environment-friendly, and meets the increasingly-improved environmental protection requirements.
Detailed Description
The invention is further illustrated below with reference to specific examples. It is to be understood, however, that these examples are illustrative only and are not to be construed as limiting the scope of the present invention. Test methods in which specific conditions are not specified in the following examples are generally carried out under conventional conditions or under conditions recommended by the manufacturer.
The expanded clinker was prepared by the method described in example (1) of application No. 02103899.6.
The anhydrite is anhydrite powder provided by Jinan Qinghai chemical company Limited, and the mesh number is 325.
Calcined coal gangue produced by Hebeijing aviation mineral products Limited is adopted, and the mesh number is 325.
Zeolite powder is clinoptilolite powder produced by Lingshou county Junteng mineral processing factory, and has 325 meshes.
The magnesium oxide is light magnesium oxide produced by Shanghai Liangjiang titanium white chemical products, Inc., and the mesh number is 325.
The methylcellulose is prepared from methylcellulose produced by Biochemical manufacturing company of Hezhong, Wuhan, and has viscosity of 1500 mPas and mesh number of 40.
The hydroxypropyl methylcellulose is hydroxypropyl methylcellulose produced by Jinan Qingtian chemical technology, Inc., has viscosity of 10 ten thousand mPa.s, and has a mesh number of 80.
The polyacrylamide is anionic polyacrylamide produced by Zibowan Jing water treatment technology limited company, the molecular weight is 2500 ten thousand, and the mesh number is 80.
The sodium polyacrylate is prepared from sodium polyacrylate produced by Henan' an product biotechnology limited company, and has a molecular weight of 700 ten thousand and a mesh number of 80.
The polycarboxylic acid water reducing agent is a polycarboxylic acid water reducing agent which is produced by novel building materials Ltd, named as xj-001, in the step of Chuan county.
Polyethylene glycol, PEG-4000 produced by Haian petrochemical plant of Jiangsu province.
Sodium gluconate is produced by Jining Baichuan chemical company.
Sodium stearate, sodium stearate manufactured by Shanghai Bishi chemical Co.
Titanium sulfate, purchased from hadamard reagent, inc.
The gamma-glycidoxypropyltrimethoxysilane is produced by Shanghai Michelle chemical technology Co., Ltd.
The mill was a Raymond mill model 3r1510, manufactured by Zhengzhou Kaixing machinery Co., Ltd.
The concrete is prepared according to the following mixing ratio: 170kg/m water3425kg/m cement3646kg/m of sand31189kg/m of crushed stone3Environmental protection high anti-permeability and anti-cracking agent 25.5kg/m3The cement, sand, gravel/environment-friendly high-impermeability anti-cracking agent is firstly stirred for 10 minutes at 100 revolutions per minute, and then water is added to be stirred for 60 seconds at 100 revolutions per minute, so that the concrete is obtained. Wherein the cement is P.O 42.5.5 ordinary Portland cement produced by Xinluo district Huizhong cement factory in Longyan city; the sand is river sand, the fineness modulus is 2.5, and the sand belongs to medium sand; the crushed stone is basalt crushed stone with the particle size of 5-10 mm.
And (3) testing mechanical properties: according to the standard of the test method for mechanical properties of ordinary concrete (GB/T50081-2002), a standard curing test piece is prepared, and the concrete test piece is tested for 28-day compressive strength by measuring the size of 100mm multiplied by 100 mm.
And (3) testing the impermeability of the concrete: the impermeability of the concrete was tested by an electric current method according to the method in section 2.2.1 of the Master thesis, research on basic mechanical properties and crack and impermeability of hybrid fiber concrete (Sunjiang).
Testing the crack resistance of the concrete: according to the standard of test methods for long-term performance and durability of common concrete (GB/T50082-2009), a concrete plane thin plate type test piece with the thickness of 800mm multiplied by 600mm multiplied by 100mm is manufactured, and according to the method in section 2.2.2 in the research on basic mechanical performance and crack resistance and impermeability of hybrid fiber concrete (Sunshan highlight) in the Master thesis, the early crack resistance is tested by adopting a flat plate method, and the total cracking area of a unit is specifically tested.
Example 1
The raw materials of the environment-friendly high-permeability-resistance anti-cracking agent (parts by weight): 20 parts of expansion clinker, 30 parts of anhydrite, 25 parts of calcined coal gangue, 15 parts of zeolite powder, 3 parts of magnesium oxide, 3 parts of water-retaining agent, 2 parts of water reducing agent, 1 part of polyethylene glycol, 0.5 part of sodium gluconate and 0.5 part of sodium stearate.
The water-retaining agent is methyl cellulose.
The water reducing agent is a polycarboxylic acid water reducing agent.
The invention also provides a preparation method of the environment-friendly high-permeability-resistance anti-cracking agent, which comprises the following steps:
(1) drying the expanded clinker, the anhydrite, the calcined coal gangue, the zeolite powder and the magnesium oxide at 105 ℃ for 3 hours;
(2) adding the raw materials dried in the step (1) into a pulverizer, and pulverizing to 300 meshes to obtain mixed powder;
(3) adding the water-retaining agent, the water reducing agent, the polyethylene glycol, the sodium gluconate and the sodium stearate into the mixed powder, and continuously grinding to 300 meshes to obtain the environment-friendly high-permeability-resistant anti-cracking agent.
Example 2
The raw materials of the environment-friendly high-permeability-resistance anti-cracking agent (parts by weight): 20 parts of expansion clinker, 30 parts of anhydrite, 25 parts of calcined coal gangue, 15 parts of modified zeolite powder, 3 parts of magnesium oxide, 3 parts of water-retaining agent, 2 parts of water reducing agent, 1 part of polyethylene glycol, 0.5 part of sodium gluconate and 0.5 part of sodium stearate.
The water-retaining agent is methyl cellulose.
The water reducing agent is a polycarboxylic acid water reducing agent.
The preparation method of the modified zeolite powder comprises the following steps:
(1) putting the zeolite powder into a muffle furnace, roasting for 3 hours at 500 ℃, naturally cooling to room temperature, and sieving with a 300-mesh sieve to obtain activated zeolite powder;
(2) activated zeolite powder and 0.5mol/L titanium sulfate aqueous solution are mixed according to the solid-to-liquid ratio of 1 g: mixing 15mL of the mixture, stirring the mixture for 50 minutes at the temperature of 25 ℃ at 200 rpm, standing the mixture for 9 hours at the temperature of 25 ℃, washing the lower-layer precipitate for 3 times by using deionized water with the mass 25 times that of the activated zeolite powder, and drying the washed precipitate for 3 hours at the temperature of 105 ℃ to obtain inorganic modified zeolite powder;
(3) mixing gamma-glycidoxypropyltrimethoxysilane and water in a volume ratio of 5: 100, stirring at the temperature of 80 ℃ for 30 minutes at 200 revolutions per minute to obtain a mixed solution, and mixing the inorganic modified zeolite powder and the mixed solution according to a solid-to-liquid ratio of 1 g: 15mL of the mixture was stirred at 300 rpm for 2 hours at 50 ℃ and centrifuged at 4000 rpm for 15 minutes, the obtained solid was washed 3 times with deionized water 25 times the mass of the inorganic modified zeolite powder, and the washed zeolite powder was dried at 105 ℃ for 3 hours to obtain a modified zeolite powder.
The preparation method of the environment-friendly high-permeability-resistance anti-cracking agent comprises the following steps:
(1) drying the expanded clinker, the anhydrite, the calcined coal gangue, the modified zeolite powder and the magnesium oxide at 105 ℃ for 3 hours;
(2) adding the raw materials dried in the step (1) into a pulverizer, and pulverizing to 300 meshes to obtain mixed powder;
(3) adding the water-retaining agent, the water reducing agent, the polyethylene glycol, the sodium gluconate and the sodium stearate into the mixed powder, and continuously grinding to 300 meshes to obtain the environment-friendly high-permeability-resistant anti-cracking agent.
Comparative example 1
Essentially the same as example 2, except that:
the preparation method of the modified zeolite powder comprises the following steps:
(1) putting the zeolite powder into a muffle furnace, roasting for 3 hours at 500 ℃, naturally cooling to room temperature, and sieving with a 300-mesh sieve to obtain activated zeolite powder;
(2) activated zeolite powder and 0.5mol/L titanium sulfate aqueous solution are mixed according to the solid-to-liquid ratio of 1 g: 15mL of the mixture was mixed, stirred at 25 ℃ at 200 rpm for 50 minutes, allowed to stand at 25 ℃ for 9 hours, the lower precipitate was washed 3 times with deionized water 25 times the mass of the activated zeolite powder, and dried at 105 ℃ for 3 hours to obtain a modified zeolite powder.
Comparative example 2
Essentially the same as example 2, except that:
the preparation method of the modified zeolite powder comprises the following steps:
(1) putting the zeolite powder into a muffle furnace, roasting for 3 hours at 500 ℃, naturally cooling to room temperature, and sieving with a 300-mesh sieve to obtain activated zeolite powder;
(2) mixing gamma-glycidoxypropyltrimethoxysilane and water in a volume ratio of 5: 100, stirring at the temperature of 80 ℃ for 30 minutes at 200 revolutions per minute to obtain a mixed solution, and mixing the activated zeolite powder and the mixed solution according to a solid-to-liquid ratio of 1 g: 15mL of the mixture was stirred at 300 rpm for 2 hours at 50 ℃ and centrifuged at 4000 rpm for 15 minutes, the obtained solid was washed 3 times with deionized water in an amount 25 times the mass of the activated zeolite powder, and the washed zeolite powder was dried at 105 ℃ for 3 hours to obtain a modified zeolite powder.
Example 3
The raw materials of the environment-friendly high-permeability-resistance anti-cracking agent (parts by weight): 20 parts of expansion clinker, 30 parts of anhydrite, 25 parts of calcined coal gangue, 15 parts of modified zeolite powder, 3 parts of magnesium oxide, 3 parts of water-retaining agent, 2 parts of water reducing agent, 1 part of polyethylene glycol, 0.5 part of sodium gluconate and 0.5 part of sodium stearate.
The water-retaining agent is hydroxypropyl methyl cellulose.
The water reducing agent is a polycarboxylic acid water reducing agent.
The preparation method of the modified zeolite powder comprises the following steps:
(1) putting the zeolite powder into a muffle furnace, roasting for 3 hours at 500 ℃, naturally cooling to room temperature, and sieving with a 300-mesh sieve to obtain activated zeolite powder;
(2) activated zeolite powder and 0.5mol/L titanium sulfate aqueous solution are mixed according to the solid-to-liquid ratio of 1 g: mixing 15mL of the mixture, stirring the mixture for 50 minutes at the temperature of 25 ℃ at 200 rpm, standing the mixture for 9 hours at the temperature of 25 ℃, washing the lower-layer precipitate for 3 times by using deionized water with the mass 25 times that of the activated zeolite powder, and drying the washed precipitate for 3 hours at the temperature of 105 ℃ to obtain inorganic modified zeolite powder;
(3) mixing gamma-glycidoxypropyltrimethoxysilane and water in a volume ratio of 5: 100, stirring at the temperature of 80 ℃ for 30 minutes at 200 revolutions per minute to obtain a mixed solution, and mixing the inorganic modified zeolite powder and the mixed solution according to a solid-to-liquid ratio of 1 g: 15mL of the mixture was stirred at 300 rpm for 2 hours at 50 ℃ and centrifuged at 4000 rpm for 15 minutes, the obtained solid was washed 3 times with deionized water 25 times the mass of the inorganic modified zeolite powder, and the washed zeolite powder was dried at 105 ℃ for 3 hours to obtain a modified zeolite powder.
The preparation method of the environment-friendly high-permeability-resistance anti-cracking agent comprises the following steps:
(1) drying the expanded clinker, the anhydrite, the calcined coal gangue, the modified zeolite powder and the magnesium oxide at 105 ℃ for 3 hours;
(2) adding the raw materials dried in the step (1) into a pulverizer, and pulverizing to 300 meshes to obtain mixed powder;
(3) adding the water-retaining agent, the water reducing agent, the polyethylene glycol, the sodium gluconate and the sodium stearate into the mixed powder, and continuously grinding to 300 meshes to obtain the environment-friendly high-permeability-resistant anti-cracking agent.
Example 4
The raw materials of the environment-friendly high-permeability-resistance anti-cracking agent (parts by weight): 20 parts of expansion clinker, 30 parts of anhydrite, 25 parts of calcined coal gangue, 15 parts of modified zeolite powder, 3 parts of magnesium oxide, 3 parts of water-retaining agent, 2 parts of water reducing agent, 1 part of polyethylene glycol, 0.5 part of sodium gluconate and 0.5 part of sodium stearate.
The water-retaining agent is polyacrylamide.
The water reducing agent is a polycarboxylic acid water reducing agent.
The preparation method of the modified zeolite powder comprises the following steps:
(1) putting the zeolite powder into a muffle furnace, roasting for 3 hours at 500 ℃, naturally cooling to room temperature, and sieving with a 300-mesh sieve to obtain activated zeolite powder;
(2) activated zeolite powder and 0.5mol/L titanium sulfate aqueous solution are mixed according to the solid-to-liquid ratio of 1 g: mixing 15mL of the mixture, stirring the mixture for 50 minutes at the temperature of 25 ℃ at 200 rpm, standing the mixture for 9 hours at the temperature of 25 ℃, washing the lower-layer precipitate for 3 times by using deionized water with the mass 25 times that of the activated zeolite powder, and drying the washed precipitate for 3 hours at the temperature of 105 ℃ to obtain inorganic modified zeolite powder;
(3) mixing gamma-glycidoxypropyltrimethoxysilane and water in a volume ratio of 5: 100, stirring at the temperature of 80 ℃ for 30 minutes at 200 revolutions per minute to obtain a mixed solution, and mixing the inorganic modified zeolite powder and the mixed solution according to a solid-to-liquid ratio of 1 g: 15mL of the mixture was stirred at 300 rpm for 2 hours at 50 ℃ and centrifuged at 4000 rpm for 15 minutes, the obtained solid was washed 3 times with deionized water 25 times the mass of the inorganic modified zeolite powder, and the washed zeolite powder was dried at 105 ℃ for 3 hours to obtain a modified zeolite powder.
The preparation method of the environment-friendly high-permeability-resistance anti-cracking agent comprises the following steps:
(1) drying the expanded clinker, the anhydrite, the calcined coal gangue, the modified zeolite powder and the magnesium oxide at 105 ℃ for 3 hours;
(2) adding the raw materials dried in the step (1) into a pulverizer, and pulverizing to 300 meshes to obtain mixed powder;
(3) adding the water-retaining agent, the water reducing agent, the polyethylene glycol, the sodium gluconate and the sodium stearate into the mixed powder, and continuously grinding to 300 meshes to obtain the environment-friendly high-permeability-resistant anti-cracking agent.
Example 5
The raw materials of the environment-friendly high-permeability-resistance anti-cracking agent (parts by weight): 20 parts of expansion clinker, 30 parts of anhydrite, 25 parts of calcined coal gangue, 15 parts of modified zeolite powder, 3 parts of magnesium oxide, 3 parts of water-retaining agent, 2 parts of water reducing agent, 1 part of polyethylene glycol, 0.5 part of sodium gluconate and 0.5 part of sodium stearate.
The water-retaining agent is sodium polyacrylate.
The water reducing agent is a polycarboxylic acid water reducing agent.
The preparation method of the modified zeolite powder comprises the following steps:
(1) putting the zeolite powder into a muffle furnace, roasting for 3 hours at 500 ℃, naturally cooling to room temperature, and sieving with a 300-mesh sieve to obtain activated zeolite powder;
(2) activated zeolite powder and 0.5mol/L titanium sulfate aqueous solution are mixed according to the solid-to-liquid ratio of 1 g: mixing 15mL of the mixture, stirring the mixture for 50 minutes at the temperature of 25 ℃ at 200 rpm, standing the mixture for 9 hours at the temperature of 25 ℃, washing the lower-layer precipitate for 3 times by using deionized water with the mass 25 times that of the activated zeolite powder, and drying the washed precipitate for 3 hours at the temperature of 105 ℃ to obtain inorganic modified zeolite powder;
(3) mixing gamma-glycidoxypropyltrimethoxysilane and water in a volume ratio of 5: 100, stirring at the temperature of 80 ℃ for 30 minutes at 200 revolutions per minute to obtain a mixed solution, and mixing the inorganic modified zeolite powder and the mixed solution according to a solid-to-liquid ratio of 1 g: 15mL of the mixture was stirred at 300 rpm for 2 hours at 50 ℃ and centrifuged at 4000 rpm for 15 minutes, the obtained solid was washed 3 times with deionized water 25 times the mass of the inorganic modified zeolite powder, and the washed zeolite powder was dried at 105 ℃ for 3 hours to obtain a modified zeolite powder.
The preparation method of the environment-friendly high-permeability-resistance anti-cracking agent comprises the following steps:
(1) drying the expanded clinker, the anhydrite, the calcined coal gangue, the modified zeolite powder and the magnesium oxide at 105 ℃ for 3 hours;
(2) adding the raw materials dried in the step (1) into a pulverizer, and pulverizing to 300 meshes to obtain mixed powder;
(3) adding the water-retaining agent, the water reducing agent, the polyethylene glycol, the sodium gluconate and the sodium stearate into the mixed powder, and continuously grinding to 300 meshes to obtain the environment-friendly high-permeability-resistant anti-cracking agent.
Example 6
The raw materials of the environment-friendly high-permeability-resistance anti-cracking agent (parts by weight): 20 parts of expansion clinker, 30 parts of anhydrite, 25 parts of calcined coal gangue, 15 parts of modified zeolite powder, 3 parts of magnesium oxide, 3 parts of water-retaining agent, 2 parts of water reducing agent, 1 part of polyethylene glycol, 0.5 part of sodium gluconate and 0.5 part of sodium stearate.
The water-retaining agent is a mixture of hydroxypropyl methyl cellulose and sodium polyacrylate, and the mass ratio of the hydroxypropyl methyl cellulose to the sodium polyacrylate is 5: 1.
The water reducing agent is a polycarboxylic acid water reducing agent.
The preparation method of the modified zeolite powder comprises the following steps:
(1) putting the zeolite powder into a muffle furnace, roasting for 3 hours at 500 ℃, naturally cooling to room temperature, and sieving with a 300-mesh sieve to obtain activated zeolite powder;
(2) activated zeolite powder and 0.5mol/L titanium sulfate aqueous solution are mixed according to the solid-to-liquid ratio of 1 g: mixing 15mL of the mixture, stirring the mixture for 50 minutes at the temperature of 25 ℃ at 200 rpm, standing the mixture for 9 hours at the temperature of 25 ℃, washing the lower-layer precipitate for 3 times by using deionized water with the mass 25 times that of the activated zeolite powder, and drying the washed precipitate for 3 hours at the temperature of 105 ℃ to obtain inorganic modified zeolite powder;
(3) mixing gamma-glycidoxypropyltrimethoxysilane and water in a volume ratio of 5: 100, stirring at the temperature of 80 ℃ for 30 minutes at 200 revolutions per minute to obtain a mixed solution, and mixing the inorganic modified zeolite powder and the mixed solution according to a solid-to-liquid ratio of 1 g: 15mL of the mixture was stirred at 300 rpm for 2 hours at 50 ℃ and centrifuged at 4000 rpm for 15 minutes, the obtained solid was washed 3 times with deionized water 25 times the mass of the inorganic modified zeolite powder, and the washed zeolite powder was dried at 105 ℃ for 3 hours to obtain a modified zeolite powder.
The preparation method of the environment-friendly high-permeability-resistance anti-cracking agent comprises the following steps:
(1) drying the expanded clinker, the anhydrite, the calcined coal gangue, the modified zeolite powder and the magnesium oxide at 105 ℃ for 3 hours;
(2) adding the raw materials dried in the step (1) into a pulverizer, and pulverizing to 300 meshes to obtain mixed powder;
(3) adding the water-retaining agent, the water reducing agent, the polyethylene glycol, the sodium gluconate and the sodium stearate into the mixed powder, and continuously grinding to 300 meshes to obtain the environment-friendly high-permeability-resistant anti-cracking agent.
The obtained environment-friendly high-impermeability anti-cracking agent is used for preparing concrete according to the mixture ratio, the 28-day compressive strength of the concrete is 50.5MPa, and the impermeability test result is as follows: electrification amount 3245C, crack resistance test result: unit total cracking area 168mm2/m2。
Test example 1
The environmental-friendly high-impermeability anti-cracking agent obtained in examples 1-5 and comparative examples 1-2 was mixed to prepare concrete, and the 28-day compressive strength of the concrete was tested. Specific results are shown in table 1.
TABLE 1 compression Strength test results Table
Test example 2
Concrete was prepared according to the formulation for the environment-friendly high-impermeability crack-resistant agent obtained in examples 1 to 5 and comparative examples 1 to 2, and impermeability of the concrete was tested. The specific results are shown in Table 2.
Table 2 impermeability test results table
Test example 3
Concrete was prepared according to the formulation for the environmentally friendly high anti-permeability crack resistant agent obtained in examples 1 to 5 and comparative examples 1 to 2, and the crack resistance of the concrete was tested. The specific results are shown in Table 3.
TABLE 3 crack resistance test results Table
The zeolite powder can improve the waterproof performance of a concrete structure, can also lighten the bleeding property of the concrete, improve the later strength of the concrete, and can also promote the concrete to be completely hydrated and have a more compact structure. In the embodiment 2 of the invention, the zeolite powder is modified, and the obtained environment-friendly high-permeability-resistance anti-cracking agent has better mechanical property, permeability resistance and crack resistance than those of the environment-friendly high-permeability-resistance anti-cracking agent in the embodiment 1. In particular, the inorganic-organic composite modification is carried out in the embodiment 2, and the obtained environment-friendly high-impermeability anti-cracking agent has better mechanical property, impermeability and crack resistance than the environment-friendly high-impermeability anti-cracking agent which is independently subjected to inorganic modification or organic modification.
The water-retaining agent is added into the concrete, so that partial water can be slowly released along with hydration, a water source is provided for the hydration of calcium sulphoaluminate, the compensation shrinkage is durable, and the volume of the concrete is kept stable. The types of the water-retaining agents are optimized in the embodiment 2 and the embodiments 3-5, and the obtained environment-friendly high-permeability-resistant anti-cracking agent has better performance by adopting hydroxypropyl methyl cellulose and sodium polyacrylate as the water-retaining agents.
Claims (6)
1. The environment-friendly high-permeability-resistance anti-cracking agent is characterized by comprising the following raw materials in parts by weight: 15-25 parts of expansion clinker, 25-35 parts of anhydrite, 20-30 parts of calcined coal gangue, 10-20 parts of modified zeolite powder, 2-5 parts of magnesium oxide, 2-5 parts of water-retaining agent, 1-3 parts of water reducer, 0.5-1.5 parts of polyethylene glycol, 0.1-1 part of sodium gluconate and 0.1-1 part of sodium stearate;
the preparation method of the modified zeolite powder comprises the following steps:
(1) placing the zeolite powder in a muffle furnace, roasting for 2-4 hours at the temperature of 400-600 ℃, naturally cooling to room temperature, and sieving with a 300-mesh sieve to obtain activated zeolite powder;
(2) activated zeolite powder and 0.5mol/L titanium sulfate aqueous solution are mixed according to the solid-to-liquid ratio of 1 g: (10-20) mL, stirring at 20-30 ℃ for 40-60 minutes at 300 r/min of 100-;
(3) mixing gamma-glycidoxypropyltrimethoxysilane and water in a volume ratio of 5: (95-105), stirring at the temperature of 75-85 ℃ for 20-40 minutes at the speed of 100-300 r/min to obtain a mixed solution, and mixing the inorganic modified zeolite powder and the mixed solution according to the solid-to-liquid ratio of 1 g: (10-20) mL, stirring at 200-60 ℃ for 1-3 hours at 500 rpm, centrifuging at 3000-5000 rpm for 10-20 minutes, washing the obtained solid with deionized water 20-30 times the mass of the inorganic modified zeolite powder for 1-5 times, and drying the cleaned zeolite powder at 100-110 ℃ for 2-4 hours to obtain the modified zeolite powder.
2. The environment-friendly high-permeability-resistance anti-cracking agent as claimed in claim 1, wherein the water retention agent is a mixture of hydroxypropyl methyl cellulose and sodium polyacrylate, and the mass ratio of the hydroxypropyl methyl cellulose to the sodium polyacrylate is (1-10): 1.
3. The environment-friendly high-permeability-resistance anti-cracking agent according to claim 1, wherein the water reducing agent is one of naphthalene-based, sulfamate-based, aliphatic and polycarboxylic acid-based water reducing agents.
4. The environment-friendly high impervious anti-cracking agent according to claim 3, wherein the water reducing agent is a polycarboxylic acid water reducing agent.
5. The environment-friendly high-impermeability and anti-cracking agent according to claim 1, wherein the expanded clinker is calcium sulfoaluminate-based expanded clinker.
6. The environment-friendly high impervious crack resistant agent according to any one of claims 1 to 5, wherein the amount of the environment-friendly high impervious crack resistant agent added in the concrete is 6 to 14 percent of the amount of the gel material.
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| CN111875285A (en) * | 2020-08-18 | 2020-11-03 | 衡阳市九州建材有限公司 | Concrete mortar anti-cracking additive and preparation method thereof |
| CN115947556B (en) * | 2022-12-16 | 2024-10-11 | 中铁大桥局集团有限公司 | Environment-friendly concrete anti-seepage and anti-cracking agent and preparation method thereof |
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