CN115403288A - Concrete anti-cracking agent and preparation method and use method thereof - Google Patents
Concrete anti-cracking agent and preparation method and use method thereof Download PDFInfo
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- CN115403288A CN115403288A CN202211171955.4A CN202211171955A CN115403288A CN 115403288 A CN115403288 A CN 115403288A CN 202211171955 A CN202211171955 A CN 202211171955A CN 115403288 A CN115403288 A CN 115403288A
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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
- 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
- C04B18/02—Agglomerated materials, e.g. artificial aggregates
- C04B18/022—Agglomerated materials, e.g. artificial aggregates agglomerated by an organic binder
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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
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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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- 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
- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
- C04B24/04—Carboxylic acids; Salts, anhydrides or esters thereof
- C04B24/06—Carboxylic acids; Salts, anhydrides or esters thereof containing hydroxy groups
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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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Abstract
The invention discloses a concrete anti-cracking agent and a preparation method and a using method thereof, wherein the anti-cracking agent comprises the following components: according to the parts by weight, 40-60 parts of ECS-1 active powder, 40-60 parts of microorganism modified polypropylene fiber and 4-5 parts of limestone powder; wherein the ECS-1 active powder comprises ethylene-tetrafluoroethylene copolymer micro powder and nano silicon dioxide aerogel powder, and the microorganism modified polypropylene fiber is obtained by sequentially carrying out hydrophilic modification and microorganism modification on polypropylene fiber. According to the invention, the mixture workability can be obviously improved and cracks of concrete caused by water evaporation can be reduced by improving the uniformity of the mixture and the water retention angle, adding the hydrophobic powder and matching with the compound microorganism-doped modified polypropylene fiber.
Description
Technical Field
The invention belongs to the technical field of building material concrete admixtures, and particularly relates to a concrete anti-cracking agent, and a preparation method and a use method thereof.
Background
Crack control of concrete is an important index for ensuring the durability of mass concrete such as bridges, tunnels, dams and the like. The concrete is cracked to reduce the durability of the concrete and the service life, and serious safety accidents can be caused in serious cases, thereby bringing about serious loss to the nationality and the civilians. The common methods for inhibiting the concrete from cracking are various, for example, physical cooling is realized by laying water pipes, and temperature-reduction cracks are reduced, so that the construction process is complex and the number of processes is large. Furthermore, the addition of an expanding agent is a common solution, which focuses on compensating for the shrinkage caused by the temperature drop of the concrete by expansion of the expanding agent.
The occurrence of concrete cracks is also related to the workability of the control mix. The concrete with good mixing proportion has uniform distribution of cement paste, sand, stone and other materials in space and compact whole body. If the mixture has the phenomena of bleeding, segregation and the like, the fluidity is poor, cement paste cannot be fixed nearby aggregates, raw materials cannot be uniformly distributed in space, the caking property is reduced, more gaps are left, and cracks are easy to generate nearby the places. In addition, the drying shrinkage of the concrete surface due to the evaporation of water also causes micro cracks, and the micro cracks may grow into large cracks under the action of external force.
Disclosure of Invention
The purpose of the invention is as follows: the invention aims to provide a concrete anti-cracking agent, which can obviously improve the workability of a mixture and reduce cracks of concrete caused by water evaporation by improving the uniformity of the mixture and the water retention angle, adding hydrophobic powder and matching with a compound microorganism-doped modified polypropylene fiber; the invention also aims to provide a preparation method of the concrete anti-cracking agent; the invention also aims to provide a using method of the concrete anti-cracking agent.
The technical scheme is as follows: the invention relates to a concrete crack resistance agent, which comprises the following components: according to the parts by weight, 40-60 parts of ECS-1 active powder, 40-60 parts of microorganism modified polypropylene fiber and 4-5 parts of limestone powder; wherein the ECS-1 active powder comprises ethylene-tetrafluoroethylene copolymer micro powder and nano silicon dioxide aerogel powder, and the microorganism modified polypropylene fiber is obtained by sequentially carrying out hydrophilic modification and microorganism modification on polypropylene fiber.
Further, the ECS-1 active powder comprises the following components: 25-35 parts of ethylene-tetrafluoroethylene copolymer micro powder, 8-12 parts of nano silicon dioxide aerogel powder and 8-12 parts of lithium citrate tetrahydrate by weight.
Furthermore, the preparation method of the ECS-1 active powder comprises the following steps: soaking the components in 40-75% alcohol solution, stirring and mixing for 30-60 min, and evaporating the alcohol solution to dryness to obtain the ECS-1 active powder. Specifically, 25-35 parts of ethylene-tetrafluoroethylene copolymer micro powder, 8-12 parts of nano silicon dioxide aerogel powder and 8-12 parts of lithium citrate tetrahydrate are soaked in 40-75% alcohol solution, stirred and mixed for 30-60 min, and the alcohol solution is evaporated to dryness to obtain the ECS-1 active powder.
Further, the hydrophilic modification method comprises the following steps: 1 part of polypropylene fiber is put into 50 to 60 parts of o-diethylbenzene; swelling for 60-90 min; filtering out polypropylene fiber, cleaning and drying; and soaking the dried polypropylene fiber in a silane coupling agent KH-570 modified solution for 30-60 min to obtain the hydrophilic modified polypropylene fiber. Specifically, 1 part of polypropylene fiber is placed in 50-60 parts of o-diethylbenzene by weight to swell at 70-90 ℃ for 60-90 min, the fiber is filtered out and washed for 2-5 times by using isopropanol, the dried fiber is dried at 40-70 ℃ for 8-12 h, and the dried fiber is soaked in a silane coupling agent KH-570 modified solution with the concentration of 25% for 30-60 min to prepare the hydrophilic modified polypropylene fiber.
Furthermore, the swelling temperature is 70-90 ℃; the drying conditions of the filtered fibers were: drying for 8-12 h at 40-70 ℃.
Further, the method for modifying the microorganism is as follows: putting the polypropylene fiber after hydrophilic modification into a bacillus solution, and stirring for dissolved oxygen modification for 4-20 h; sterilizing, drying, modifying in an alcaligenes solution for 4-20 h, and finally sterilizing and drying to obtain the microbial modified polypropylene fiber. Specifically, the polypropylene fiber prepared by hydrophilic modification is placed in a bacillus solution with the temperature of 20-30 ℃ for stirring and oxygen dissolving modification for 4-20 h, sterilized by 75% alcohol for 10-30 min, dried and then placed in an alkaline producing bacillus solution with the temperature of 20-30 ℃ for modification for 4-20 h, and finally sterilized by 75% alcohol for 10-30 min and then dried.
Preferably, the particle size of the ethylene-tetrafluoroethylene copolymer micro powder is 1-10 μm; the diameter of the nano silicon dioxide aerogel powder is 20-100 nm.
Preferably, the purity of the lithium citrate tetrahydrate is more than 90%.
Preferably, the diameter of the microorganism modified polypropylene fiber is 10-40 μm, and the average length is 30-40 mm; the limestone powder has an average diameter of 10 to 120 μm.
According to the concrete crack resistance agent, the ethylene-tetrafluoroethylene copolymer micro powder and the nano silicon dioxide aerogel in the ECS-1 active powder are used as water retention components, the adsorption of cement paste on aggregate is increased by changing the surface tension of water, so that the mixture has higher consistency and more uniform substance distribution, the surface moisture evaporation of concrete is reduced, and the drying shrinkage and the generation of cracks are reduced. Meanwhile, the ethylene-tetrafluoroethylene copolymer, the nano-silica aerogel and the limestone powder in the ECS-1 active powder have different particle sizes, play a certain filling role and improve the microstructure of concrete; the modified polypropylene fiber has hydrophilicity, can be uniformly dispersed in concrete, is well combined with the concrete, counteracts stress generated by cement shrinkage by generating tensile stress, and reduces generation and expansion of cracks; lithium citrate tetrahydrate in the ECS-1 active powder improves the fluidity of the mixture, improves the strength of the concrete in the later period, and is dispersed on the surfaces of ethylene-tetrafluoroethylene copolymer micro powder and nano silicon dioxide aerogel powder through an alcohol solution, so that the ECS-1 active powder can be uniformly dispersed in the concrete.
On the other hand, the invention provides a preparation method of the concrete crack resistance agent, which comprises the following steps: mechanically mixing the raw materials of each component in a stirrer for 5-20min to obtain the concrete anti-cracking agent. Specifically, by mass, 25-35 parts of ethylene-tetrafluoroethylene copolymer micro powder, 8-12 parts of nano silicon dioxide aerogel powder and 8-12 parts of lithium citrate tetrahydrate are soaked in 40-75% alcohol solution and stirred and mixed for 30-60 min, after the alcohol solution is evaporated to dryness, the powder, 40-50 parts of microorganism modified polypropylene fiber and 4-5 parts of limestone powder are mechanically mixed in a stirrer for 5-20min to obtain the composite material.
On the other hand, the invention provides a use method of the concrete anti-cracking agent, wherein the concrete anti-cracking agent is added in the process of dry mixing of concrete, and the mixing amount is 0.5-2.0 kg per cubic meter of concrete.
Has the advantages that: compared with the prior art, the invention has the following remarkable advantages:
(1) The ethylene-tetrafluoroethylene copolymer micro powder and the nano silicon dioxide aerogel in the ECS-1 active powder have the advantages of improving the workability of a mixture and reducing bleeding and segregation; the water evaporation on the surface of the concrete is reduced after the concrete is formed, and the drying shrinkage and the generation of cracks are reduced;
(2) The ECS-1 active powder and the limestone powder have a filling effect, and can improve the microstructure of concrete;
(3) The invention adopts the microorganism modified polypropylene fiber, has hydrophilicity and is uniformly distributed in concrete; the surface is rough after the microbial modification, the combination with concrete is good, the stress generated by cement shrinkage is counteracted by generating tensile stress, and the generation and the expansion of cracks are reduced;
(4) The lithium citrate tetrahydrate in the ECS-1 active powder has the advantages of improving the fluidity of a mixture, improving the strength of concrete in the later period, and enabling the ECS-1 active powder to be uniformly dispersed in the concrete by dispersing the lithium citrate tetrahydrate on the surfaces of ethylene-tetrafluoroethylene copolymer micro powder and nano silicon dioxide aerogel powder through an alcohol solution.
Detailed Description
Example 1
The embodiment provides a concrete anti-cracking agent, which comprises the following components: according to parts by weight, 60 parts of ECS-1 active powder, 40 parts of microbial modified polypropylene fiber and 10 parts of limestone powder. Wherein the average grain diameter of the ethylene-tetrafluoroethylene copolymer micro powder is 1-10 mu m; the limestone powder has an average diameter of 10 to 120 μm.
The preparation method of the concrete crack resistance agent comprises the following steps: according to the weight portion, 60 portions of ECS-1 active powder, 40 portions of microorganism modified polypropylene fiber and 10 portions of limestone powder are mechanically mixed in a stirrer for 5-20min to obtain the modified polypropylene fiber.
Wherein the ECS-1 active powder comprises the following components: 25 parts of ethylene-tetrafluoroethylene copolymer micro powder, 12 parts of nano silicon dioxide aerogel powder and 8 parts of lithium citrate tetrahydrate. The average diameter of the nano silicon dioxide aerogel powder is 20-100 nm. The preparation method of the ECS-1 active powder comprises the following steps: soaking the components of the ECS-1 active powder in 40-75% alcohol solution, stirring and mixing for 30-60 min, and evaporating the alcohol solution to obtain the ECS-1 active powder.
Wherein the average diameter of the microorganism modified polypropylene fiber is 10-40 μm, the average length is 30-40 mm, and the microorganism modified polypropylene fiber is obtained by sequentially carrying out hydrophilic modification and microorganism modification on the polypropylene fiber. The modification steps are as follows:
(1) Hydrophilic modification:
according to parts by weight, 1 part of polypropylene fiber is placed in 50 parts of o-diethylbenzene to swell for 60-90 min at 70-90 ℃, the fiber is filtered out and then washed with isopropanol for 2-5 times, the fiber is dried for 8-12 h at 40-70 ℃, and the dried fiber is soaked in a silane coupling agent KH-570 modified solution with the concentration of 25% for 30-60 min.
(2) And (3) modifying microorganisms:
and (2) placing the polypropylene fiber prepared by hydrophilic modification in a bacillus solution at 20-30 ℃ for stirring, dissolving oxygen and modifying for 4-20 h, disinfecting for 10-30 min by using 75% alcohol, drying, then placing in an alcaligenes solution at 20-30 ℃ for modifying for 4-20 h, finally disinfecting for 10-30 min by using 75% alcohol, and drying.
The embodiment provides an anti-crack concrete, wherein an anti-crack agent for the concrete is added in the process of dry mixing of ordinary concrete, and the mixing amount of the anti-crack agent is 0.5, 1.0 and 2.0kg per cubic meter of the concrete. The common concrete comprises the following components: cement, water, sand, small stone (5-20 mm), large stone (20-40 mm) and a water reducing agent.
Example 2
The embodiment provides a concrete anti-cracking agent, which comprises the following components: according to parts by weight, 40 parts of ECS-1 active powder, 60 parts of microbial modified polypropylene fiber and 1 part of limestone powder. Wherein the average grain diameter of the ethylene-tetrafluoroethylene copolymer micro powder is 1-10 mu m; the limestone powder has an average diameter of 10 to 120 μm.
The preparation method of the concrete crack resistance agent comprises the following steps: according to the weight portion, 40 portions of ECS-1 active powder, 60 portions of microorganism modified polypropylene fiber and 1 to 10 portions of limestone powder are mechanically mixed in a stirrer for 5 to 20min to obtain the modified polypropylene fiber.
Wherein the ECS-1 active powder comprises the following components: according to parts by weight, 35 parts of ethylene-tetrafluoroethylene copolymer micro powder, 8 parts of nano silicon dioxide aerogel powder and 12 parts of lithium citrate tetrahydrate. The average diameter of the nano silicon dioxide aerogel powder is 20-100 nm. The preparation method of the ECS-1 active powder comprises the following steps: soaking the components of the ECS-1 active powder in 40-75% alcohol solution, stirring and mixing for 30-60 min, and evaporating the alcohol solution to obtain the ECS-1 active powder.
Wherein the average diameter of the microorganism modified polypropylene fiber is 10-40 μm, the average length is 30-40 mm, and the microorganism modified polypropylene fiber is obtained by sequentially carrying out hydrophilic modification and microorganism modification on the polypropylene fiber. The modification steps are as follows:
(1) Hydrophilic modification:
according to parts by weight, 1 part of polypropylene fiber is placed in 60 parts of o-diethylbenzene to swell for 60-90 min at 70-90 ℃, the fiber is filtered out and then washed with isopropanol for 2-5 times, the fiber is dried for 8-12 h at 40-70 ℃, and the dried fiber is soaked in a silane coupling agent KH-570 modified solution with the concentration of 25% for 30-60 min.
(2) Modifying microorganisms:
and (2) placing the polypropylene fiber prepared by hydrophilic modification in a bacillus solution at 20-30 ℃ for stirring, dissolving oxygen and modifying for 4-20 h, disinfecting for 10-30 min by using 75% alcohol, drying, then placing in an alcaligenes solution at 20-30 ℃ for modifying for 4-20 h, finally disinfecting for 10-30 min by using 75% alcohol, and drying.
The embodiment provides an anti-crack concrete, wherein an anti-crack agent for the concrete is added in the process of dry mixing of ordinary concrete, and the mixing amount of the anti-crack agent is 0.5, 1.0 and 2.0kg per cubic meter of the concrete. The common concrete comprises the following components: cement, water, sand, small stone (5-20 mm), large stone (20-40 mm) and a water reducing agent.
Example 3
The embodiment provides a concrete crack resistance agent, which comprises the following components: according to parts by weight, 50 parts of ECS-1 active powder, 50 parts of microorganism modified polypropylene fiber and 5 parts of limestone powder. Wherein the average grain diameter of the ethylene-tetrafluoroethylene copolymer micro powder is 1-10 mu m; the limestone powder has an average diameter of 10 to 120 μm.
The preparation method of the concrete anti-cracking agent comprises the following steps: according to the weight portion, 40-60 portions of ECS-1 active powder, 40-60 portions of microorganism modified polypropylene fiber and 1-10 portions of limestone powder are mechanically mixed in a stirrer for 5-20min to obtain the modified polypropylene fiber.
Wherein the ECS-1 active powder comprises the following components: according to parts by weight, 30 parts of ethylene-tetrafluoroethylene copolymer micro powder, 10 parts of nano silicon dioxide aerogel powder and 10 parts of lithium citrate tetrahydrate. The average diameter of the nano silicon dioxide aerogel powder is 20-100 nm. The preparation method of the ECS-1 active powder comprises the following steps: soaking the components of the ECS-1 active powder in 40-75% alcohol solution, stirring and mixing for 30-60 min, and evaporating the alcohol solution to obtain the ECS-1 active powder.
Wherein the average diameter of the microorganism modified polypropylene fiber is 10-40 μm, the average length is 30-40 mm, and the microorganism modified polypropylene fiber is obtained by sequentially carrying out hydrophilic modification and microorganism modification on the polypropylene fiber. The modification steps are as follows:
(1) Hydrophilic modification:
according to the weight portion, 1 portion of polypropylene fiber is placed in 55 portions of o-diethylbenzene to swell for 60-90 min at 70-90 ℃, the fiber is filtered out and washed for 2-5 times by using isopropanol, the fiber is dried for 8-12 h at 40-70 ℃, and the dried fiber is soaked in a silane coupling agent KH-570 modified solution with the concentration of 25% for 30-60 min.
(2) Modifying microorganisms:
the polypropylene fiber prepared by hydrophilic modification is put into bacillus solution with the temperature of 20-30 ℃ for stirring and oxygen dissolving modification for 4-20 h, sterilized by 75% alcohol for 10-30 min, dried and then put into alcaligenes solution with the temperature of 20-30 ℃ for modification for 4-20 h, and finally sterilized by 75% alcohol for 10-30 min and then dried.
The embodiment provides an anti-crack concrete, wherein an anti-crack agent for the concrete is added in the process of dry mixing of ordinary concrete, and the mixing amount of the anti-crack agent is 0.5, 1.0 and 2.0kg per cubic meter of the concrete. The common concrete comprises the following components: cement, water, sand, small stone (5-20 mm), large stone (20-40 mm) and a water reducing agent.
In order to show that the proportion of the anti-cracking agent in the embodiment is the most preferable proportion, 5 groups of proportion are set as reference.
Comparative example 1
The comparative example differs from example 2 in that: the concrete crack resistance agent provided by the comparative example does not contain ECS-1 active powder. Specifically, the anti-cracking agent comprises the following components: 60 parts of microbial modified polypropylene fiber and 1 part of limestone powder. Wherein the microbial modified polypropylene fiber was the same as in example 2.
According to the weight portion, 60 portions of microorganism modified polypropylene fiber and 1 portion of limestone powder are mechanically mixed in a mixer for 5-20min to obtain the anti-cracking agent without ECS-1 active powder, and 1.0kg of the anti-cracking agent is doped in per cubic meter of concrete.
Comparative example 2
The comparative example differs from example 2 in that: the concrete anti-cracking agent provided by the comparative example does not contain microbial modified polypropylene fibers. Specifically, the anti-cracking agent comprises the following components: according to parts by weight, 40 parts of ECS-1 active powder and 1 part of limestone powder. Wherein the ECS-1 active powder was the same as in example 2.
According to the weight portion, 40 portions of ECS-1 active powder and 5 portions of limestone powder are mechanically mixed in a mixer for 5-20min to obtain the anti-cracking agent without microorganism-doped modified polypropylene fiber, and 1.0kg of the anti-cracking agent is doped in per cubic meter of concrete.
Comparative example 3
The comparative example differs from example 2 in that: the concrete crack resistance agent provided by the comparative example is different in ECS-1 active powder, and the ECS-1 active powder of the comparative example is not added with ethylene-tetrafluoroethylene copolymer micro powder.
Specifically, the anti-cracking agent comprises the following components: according to parts by weight, 40 parts of ECS-1 active powder, 60 parts of microorganism modified polypropylene fiber and 1 part of limestone powder. The microorganism-modified polypropylene fiber was the same as in example 2.
The ECS-1 active powder comprises the following components: according to parts by weight, 8 parts of nano silicon dioxide aerogel powder and 12 parts of lithium citrate tetrahydrate. The preparation method comprises the following steps: according to parts by weight, 8 parts of nano silicon dioxide aerogel powder and 12 parts of lithium citrate tetrahydrate are soaked in 40-75% alcohol solution, stirred and mixed for 30-60 min, and the alcohol solution is evaporated to dryness to obtain the ECS-1 active powder without ethylene-tetrafluoroethylene copolymer micro powder.
40 parts of ECS-1 active powder without ethylene-tetrafluoroethylene copolymer micro powder, 60 parts of microorganism modified polypropylene fiber and 1 part of limestone powder are mechanically mixed in a stirrer for 5-20min to obtain the anti-cracking agent without ethylene-tetrafluoroethylene copolymer micro powder, and 1.0kg of the anti-cracking agent is doped in per cubic meter of concrete.
Comparative example 4
The comparative example differs from example 2 in that: the concrete crack resistance agent provided by the comparative example is different from the ECS-1 active powder, and the ECS-1 active powder of the comparative example is not added with nano silicon dioxide aerogel powder.
Specifically, the anti-cracking agent comprises the following components: according to parts by weight, 40 parts of ECS-1 active powder, 60 parts of microbial modified polypropylene fiber and 1 part of limestone powder. The microorganism-modified polypropylene fiber was the same as in example 2.
The ECS-1 active powder comprises the following components: according to the weight parts, 35 parts of ethylene-tetrafluoroethylene copolymer micro powder and 12 parts of lithium citrate tetrahydrate. The preparation method comprises the following steps: 35 parts of ethylene-tetrafluoroethylene copolymer micro powder and 12 parts of lithium citrate tetrahydrate are soaked in 40-75% alcohol solution, stirred and mixed for 30-60 min, and the alcohol solution is evaporated to dryness to prepare the ECS-1 active powder without the nano silicon dioxide aerogel powder.
40 parts of ECS-1 active powder without nano silicon dioxide aerogel powder, 60 parts of microorganism modified polypropylene fiber and 1 part of limestone powder are mechanically mixed in a mixer for 5-20min to obtain the crack resistance agent without nano silicon dioxide aerogel powder, and 1.0kg of the crack resistance agent is doped into per cubic meter of concrete.
Comparative example 5
The comparative example provides a concrete crack resistance agent, which comprises the following components: according to parts by weight, 30 parts of ECS-1 active powder, 70 parts of microbial modified polypropylene fiber and 5 parts of limestone powder. The composition and preparation method of the ECS-1 active powder are the same as those of example 2. The components and preparation method of the microbial modified polypropylene fiber are the same as those of example 2.
According to the weight percentage, 30 parts of ECS-1 active powder, 70 parts of microorganism modified polypropylene fiber and 5 parts of limestone powder are mechanically mixed in a mixer for 5-20min to obtain the anti-cracking agent which is not in the most preferable proportion, and 1.0kg of the anti-cracking agent is doped into per cubic meter of concrete.
Crack resistance test
The mixing amount (0.5, 1.0 and 2.0 kg) of the anti-cracking agent in the example 2 is added into concrete, and the anti-cracking performance of the concrete in a slab constraint state is tested according to GB/T50082-2009 Standard test method for Long-term Performance and durability of ordinary concrete by taking the non-mixing anti-cracking agent as a blank sample. The concrete mixing proportion is shown in a table 1, and the crack resistance detection result is shown in a table 2.
TABLE 1 concrete mix proportion
Table 2 concrete crack resistance test results of example 2
From the above test results, it can be seen that: compared with a blank group, the crack resistance agent is doped, so that the generation of cracks is greatly reduced. Compared with a blank group, the amount of the mixed crack is respectively reduced by 8, 29 and 21 cracks in the amount of 0.5kg, 1kg and 2kg, the length of the crack is respectively reduced by 29.3%,91.0% and 74.1%, the total area of the crack is respectively reduced by 66.2%,98.6% and 85.6%, and the anti-cracking effect is the best when the mixed amount is 1 kg.
The anti-cracking agents in the examples and the comparative examples are added into concrete according to the mixing amount of 1kg, the anti-cracking agent is not mixed to serve as a blank sample, and the anti-cracking performance of the concrete in a flat plate constraint state is tested according to GB/T50082-2009 Standard test method for Long-term Performance and durability of ordinary concrete. The concrete mixing proportion is shown in a table 1, and the crack resistance detection result is shown in a table 2.
TABLE 3 concrete crack resistance test results
From the above test results, it can be seen that: compared with a blank group, the crack resistance agent is doped, so that the generation of cracks is greatly reduced. Wherein, compared with the blank group, the number of the cracks of the examples 1, 2 and 3 is respectively reduced by 19, 29 and 24, the length of the cracks is respectively reduced by 75.6%,91.1% and 80.2%, the total area of the cracks is respectively reduced by 89.9%,98.6% and 96.9%, and the crack resistance effect of the comparative examples 1, 2, 3, 4 and 5 is not as good as that of the 3 examples. This shows that the anti-cracking agent prepared in the examples has the best anti-cracking effect, and the anti-cracking effect is the best when the mixing amount is 1 kg.
The above are preferred embodiments of the present invention, and not intended to limit the scope of the present invention, and any modifications, equivalents and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. The concrete crack resistance agent is characterized by comprising the following components: according to the parts by weight, 40-60 parts of ECS-1 active powder, 40-60 parts of microorganism modified polypropylene fiber and 4-5 parts of limestone powder; wherein the ECS-1 active powder comprises ethylene-tetrafluoroethylene copolymer micro powder and nano silicon dioxide aerogel powder, and the microorganism modified polypropylene fiber is obtained by sequentially carrying out hydrophilic modification and microorganism modification on polypropylene fiber.
2. The concrete crack resistance agent according to claim 1, wherein the ECS-1 active powder comprises the following components: 25-35 parts of ethylene-tetrafluoroethylene copolymer micro powder, 8-12 parts of nano silicon dioxide aerogel powder and 8-12 parts of lithium citrate tetrahydrate by weight.
3. The concrete crack resistance agent according to claim 2, wherein the preparation method of the ECS-1 active powder comprises the following steps: soaking the components in 40-75% alcohol solution, stirring and mixing for 30-60 min, and evaporating the alcohol solution to obtain ECS-1 active powder.
4. The concrete crack resistance agent according to claim 1, wherein the hydrophilic modification method comprises: 1 part of polypropylene fiber is put into 50 to 60 parts of o-diethylbenzene; swelling for 60-90 min; filtering out polypropylene fiber, washing and drying; and soaking the dried polypropylene fiber in a silane coupling agent KH-570 modified solution for 30-60 min to obtain the hydrophilic modified polypropylene fiber.
5. The concrete crack resistance agent according to claim 4, wherein the swelling temperature is 70-90 ℃; the drying conditions of the filtered fibers were: drying for 8-12 h at 40-70 ℃.
6. The concrete crack resistance agent according to claim 4, wherein the microorganism modification method comprises the following steps: putting the polypropylene fiber after hydrophilic modification into a bacillus solution, and stirring for dissolved oxygen modification for 4-20 h; sterilizing, drying, modifying in an alcaligenes solution for 4-20 h, and finally sterilizing and drying to obtain the microbial modified polypropylene fiber.
7. The concrete crack inhibitor according to claim 1, wherein the particle size of the ethylene-tetrafluoroethylene copolymer fine powder is 1 to 10 μm; the diameter of the nano silicon dioxide aerogel powder is 20-100 nm.
8. The concrete crack resistance agent according to claim 1, wherein the microbial modified polypropylene fiber has a diameter of 10 to 40 μm and an average length of 30 to 40mm; the limestone powder has an average diameter of 10 to 120 μm.
9. A method for preparing the concrete crack inhibitor according to any one of claims 1 to 8, wherein the method comprises the following steps: mechanically mixing the raw materials of each component in a stirrer for 5-20min to obtain the concrete anti-cracking agent.
10. A use method of the concrete crack resistance agent according to any one of claims 1 to 8, characterized in that the concrete crack resistance agent is added in the process of dry mixing the concrete, and the adding amount is 0.5 to 2.0kg per cubic meter of the concrete.
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| CN116553886A (en) * | 2023-04-22 | 2023-08-08 | 北京民佳混凝土有限公司 | Crack-resistant waterproof concrete and preparation method thereof |
| CN116675460A (en) * | 2023-06-08 | 2023-09-01 | 湖北腾辰科技股份有限公司 | Seepage-proofing and crack-proofing concrete additive and preparation method thereof |
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