CN113816646B - Concrete mortar anti-cracking additive and preparation method thereof - Google Patents
Concrete mortar anti-cracking additive and preparation method thereof Download PDFInfo
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- CN113816646B CN113816646B CN202111107151.3A CN202111107151A CN113816646B CN 113816646 B CN113816646 B CN 113816646B CN 202111107151 A CN202111107151 A CN 202111107151A CN 113816646 B CN113816646 B CN 113816646B
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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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- 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
- C04B24/24—Macromolecular compounds
- C04B24/26—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
- C04B24/2641—Polyacrylates; Polymethacrylates
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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)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention relates to a concrete mortar anti-cracking additive and a preparation method thereof, wherein the anti-cracking additive comprises the following raw materials in percentage by weight: 45-55% of fly ash, 8-12% of modified basalt fiber, 3-8% of high-shrinkage additive, 0.5-0.8% of air entraining agent, 2-5% of dispersing agent and the balance of water. The components of the invention are easily available in raw materials and simple in preparation process, and by selecting polyacrylic acid hydrogel as a high-shrinkage additive and generating strong interaction with basalt fibers introduced with calcium acetate through modification, the tissue structure of concrete mortar doped with the additive is strongly shrunk, so that concrete mortar with strong shrinkage and a high-energy density structure is formed, and the anti-cracking performance and the application performance of the concrete mortar are greatly improved.
Description
Technical Field
The invention belongs to the technical field of concrete additives, and particularly relates to a concrete mortar anti-cracking additive and a preparation method thereof.
Background
Concrete surface cracking has always been one of the most common quality problems in various concrete projects. Visible surface microcracks not only have a direct effect on the appearance of the concrete, but also develop into deeper quality problems over time, contributing to the safe use of the concrete structure.
The concrete has the characteristics of high strength, high rigidity, long service life, good economic benefit and the like, and is widely applied to infrastructure construction. With the improvement of the modernized construction level, higher requirements are also put forward on the performance of the concrete, and although the concrete has excellent engineering characteristics, the common cement concrete has the defects of low tensile strength, low breaking strength, poor toughness, large brittleness and the like, so that the wider application of the cement concrete in engineering is limited;
through research progress at home and abroad, the strength and toughness of the concrete can be effectively improved by doping the fiber material into the concrete. At present, the commonly used fibers in cement concrete comprise mineral fibers, glass fibers, carbon fibers, steel fibers and polypropylene fibers, the glass fibers and cement materials have large attribute difference and are difficult to be compatible, and the carbon fibers are expensive and are difficult to disperse in the concrete; the corrosion resistance of the steel fiber and the polypropylene fiber is poor, which is not beneficial to the exertion of the long-term crack resistance effect;
the mineral fiber is obtained from mineral rocks with fibrous structures, the main components of the mineral fiber are various oxides, such as silicon dioxide, aluminum oxide, magnesium oxide and the like, the mineral fiber is brucite fiber, asbestos fiber, wheat fiber, glass fiber, basalt fiber and the like, the mineral fiber has good compatibility with concrete mortar, low cost and consistent service life with the concrete, and can be used for modifying the concrete mortar.
Therefore, the concrete mortar anti-cracking additive and the preparation method thereof are provided.
Disclosure of Invention
The invention aims to solve the problems and provides an anti-crack additive for concrete mortar and a preparation method thereof.
The invention realizes the purpose through the following technical scheme:
the anti-cracking additive for the concrete mortar comprises the following raw materials in percentage by weight: 45-55% of fly ash, 8-12% of modified basalt fiber, 3-8% of high-shrinkage additive, 0.5-0.8% of air entraining agent, 2-5% of dispersing agent and the balance of water.
As a further optimization scheme of the invention, the high-shrinkage additive is nano-cellulose hydrogel or polyacrylic acid hydrogel.
As a further optimization scheme of the invention, the modified basalt fiber is prepared by modifying the surface of the basalt fiber with acid liquor, then adding calcium acetate, rubber powder, sulfuric acid and water-ground slurry, then adding magnesium chloride for reaction, cooling the prepared mixed material to room temperature, washing, drying and grinding into powder.
As a further optimized scheme of the invention, the dispersing agent is hydroxypropyl methyl cellulose or sodium gluconate.
As a further optimization scheme of the invention, the air entraining agent is alkyl benzene sulfonate or fatty alcohol sulfonate.
The preparation method of the concrete mortar anti-cracking additive mainly comprises the following steps:
(1) Accurately weighing the raw materials with required dosage according to the component proportion of the anti-cracking additive;
(2) Feeding the modified basalt fiber, the fly ash and the dispersant into a dry powder stirrer together, and uniformly stirring to obtain mixed dry powder;
(3) And (3) adding a certain amount of water into a reaction kettle, putting the mixed dry powder obtained in the step (2) into the reaction kettle, adding an air entraining agent and a high shrinkage additive, slowly stirring, heating to 80-90 ℃, reacting for 1-2h, cooling the mixed material after the reaction to room temperature, washing, drying and grinding to obtain the concrete mortar anti-cracking additive.
As a further optimization scheme of the invention, in the step (3), the granularity of the concrete mortar anti-cracking additive is 45-100 meshes.
The invention has the beneficial effects that:
1. the concrete mortar anti-cracking additive provided by the invention is prepared by taking modified basalt fiber, fly ash, modified basalt fiber, high-shrinkage additive, air entraining agent, dispersant and water as main raw materials, and strong interaction is generated between the high-shrinkage additive and the modified basalt fiber introduced with calcium acetate when the high-shrinkage additive is obtained by exploration and selected from polyacrylic acid hydrogel, so that the tissue structure of the concrete mortar doped with the additive is strongly shrunk, the concrete mortar with strong shrinkage and a high-energy density structure is formed, and the anti-cracking performance and the application performance of the concrete mortar are greatly improved.
Detailed Description
The present application is described in further detail below, and it should be noted that the following detailed description is provided for illustrative purposes only, and is not intended to limit the scope of the present application, which is defined by the appended claims.
A preparation method of a concrete mortar anti-cracking additive mainly comprises the following steps,
(1) The modified basalt fiber is prepared by performing surface modification on the basalt fiber by using acid liquor, adding calcium acetate, rubber powder, sulfuric acid and water-ground slurry, adding magnesium chloride for reaction, slowly stirring, heating to 80-95 ℃, reacting for 0.5-1h, cooling a mixed material prepared from a mixture after the reaction is finished to room temperature, washing, drying and grinding;
(2) Weighing 45-55% of fly ash, 8-12% of modified basalt fiber and 2-5% of a dispersant in required amount according to the component proportion of the anti-cracking additive, and sending the materials into a dry powder stirrer to be uniformly stirred to obtain mixed dry powder, wherein the dispersant is hydroxypropyl methyl cellulose or sodium gluconate;
(3) Adding a certain amount of water into a reaction kettle, putting the mixed dry powder obtained in the step (2) into the reaction kettle, adding 0.5-0.8% of air entraining agent and 3-8% of high shrinkage additive in required amounts, slowly stirring, heating to 80-90 ℃, reacting for 1-2h, cooling the mixed material after the reaction to room temperature, washing, drying and grinding to obtain the concrete mortar anti-crack additive with the granularity of 45-100 meshes, wherein the air entraining agent is alkyl benzene sulfonate or fatty alcohol sulfonate, and the high shrinkage additive is nano-cellulose hydrogel or polyacrylic acid hydrogel.
Example 1
The embodiment provides a preparation method of a concrete mortar anti-cracking additive, which mainly comprises the following steps,
(1) The modified basalt fiber is prepared by modifying the surface of basalt fiber by using acid liquor, adding calcium acetate, rubber powder, sulfuric acid and water-ground slurry, adding magnesium chloride for reaction, slowly stirring, heating to 85 ℃ for reaction for 1h, cooling a mixed material prepared from a mixture after the reaction is finished to room temperature, washing, drying and grinding into powder;
(2) Weighing 50% of fly ash, 10% of modified basalt fiber and 3.5% of hydroxypropyl methyl cellulose which are used as air entraining agents and used in required amounts according to the component proportion of the anti-cracking additive, and sending the materials into a dry powder stirrer together for uniform stirring to obtain mixed dry powder;
(3) Adding a certain amount of water into a reaction kettle, putting the mixed dry powder obtained in the step (2) into the reaction kettle, adding 0.6% of alkylbenzene sulfonate serving as a dispersant and 5.5% of nanocellulose hydrogel serving as a high shrinkage additive in required amount, slowly stirring, heating to 90 ℃ for reaction for 2 hours, cooling the mixed material after the reaction to room temperature, washing, drying and grinding to obtain the concrete mortar anti-crack additive with the granularity of 100 meshes.
Example 2
The difference from example 1 is that unmodified basalt fiber is used.
Example 3
The difference from example 1 is that polyacrylic acid hydrogel was used as a high shrinkage additive;
example 4
The difference from the embodiment 3 is that in the step of modifying the basalt fiber, calcium acetate is not added, namely the basalt fiber is modified on the surface by utilizing acid liquor, the ground slurry of rubber powder, sulfuric acid and water is added, then magnesium chloride is added for reaction, the mixture is slowly stirred and heated to 85 ℃ for reaction for 1h, the mixed material prepared from the mixture after the reaction is finished is cooled to room temperature, and the mixed material is washed, dried and ground into powder;
example 5
The difference from example 3 is that unmodified basalt fiber is used;
example 6
The difference from the embodiment 1 is that in the step of modifying the basalt fiber, calcium acetate is not added, namely the basalt fiber is modified on the surface by acid liquor, the rubber powder, sulfuric acid and water ground slurry are added, then magnesium chloride is added for reaction, the mixture is slowly stirred and heated to 85 ℃ for reaction for 1h, the mixed material prepared from the mixture after the reaction is finished is cooled to room temperature, and the mixed material is washed, dried and ground into powder.
1. Test for crack resistance
Respectively adding 3.0% of the additive prepared in the embodiments 1-6 of the invention into concrete mortar by mass percent to serve as test groups 1-6, taking standard concrete mortar without the additive as a blank group, uniformly coating the concrete mortar of the test groups 1-6 and the blank group on a base material with the side length of 100mm multiplied by 100mm, ensuring that the coating thickness of the concrete mortar is 100mm, naturally drying to obtain 7 groups of test pieces, and sequentially carrying out crack resistance test on the 7 groups of test pieces after 28 days;
according to GB/T50082-2009' test for long-term performance and durability of common concreteThe early crack resistance test method in empirical method standard adopts a planar thin plate mould of 800mm multiplied by 600mm multiplied by 100mm and contains 7 crack inducers; in addition, keeping the wind speed at the center of the surface of the test piece to be not less than 5m/s, recording the width and the length of the crack after the test is finished, and utilizing a formula eta = (A) according to CECS 38-2004 technical Specification for fiber concrete structures mer -A fer ）/A mer Wherein A is mer 、A fer Calculating the crack reduction coefficient eta for the total crack areas of the reference concrete and the fiber concrete respectively, and performing crack resistance evaluation by referring to the table 1;
TABLE 1 comparison of fracture reduction coefficient eta and fracture limiting effectiveness grade
The results of the crack resistance test on 7 test pieces are shown in table 2,
TABLE 2 test results of crack resistance test
As can be seen from Table 2, the anti-crack additive prepared in example 3 of the present invention has a stronger effect of improving the anti-crack performance of the concrete mortar than other examples, for example, the maximum crack width is only 0.22mm, the number of cracks per unit area is only 4.16, and the total area of cracks per unit area is only 124mm 2 The fracture reduction coefficient eta is 0.824 through calculation, and the fracture limiting efficiency grade of the fracture reduction coefficient eta is one grade higher than that of other embodiments according to the fracture reduction coefficient eta and the fracture limiting efficiency grade comparison table shown in the table 1;
compared with the embodiment 1, the modified basalt fibers and the polyacrylic acid hydrogel used as the high shrinkage additive in the additive component formula are superior to the nano cellulose hydrogel used as the high shrinkage additive in anti-cracking performance;
the concrete mortars of examples 4 and 5 have comparable crack resistance, while the concrete mortars of example 3 have better crack resistance than unmodified basalt fibers than those of examples 4 and 5, because the modified basalt fibers are used in the additive component formula, when the polyacrylic acid hydrogel is immersed in the aqueous solution of the basalt fibers containing calcium acetate, calcium and acetate ions diffuse into the gel to form bonding polymer groups with carboxyl groups, the hydrophobic acetate parts dehydrate at high temperature, and the relative dielectric constant of the environment is reduced, so that ionic bonds between the carboxyl groups and the calcium ions are strengthened, and the interaction between the hydrophobic and ionic interactions triggers the strong dehydration of the polymer, so that the tissue structure of the concrete mortar doped with the additive is strongly shrunk, the concrete mortar with the strong shrinkage and high energy density structure is formed, and the crack resistance is greatly improved.
2. Application Performance test
Respectively adding 3.0% by mass of the additives prepared in the embodiments 1-6 of the invention into concrete mortar to serve as test groups 1-6, taking standard concrete mortar without the additives as a blank group, uniformly coating the concrete mortar of the test groups 1-6 and the blank group on a base material with the side length of 100mm multiplied by 100mm, ensuring that the coating thickness of the concrete mortar is 100mm, naturally drying to obtain 7 groups of test pieces, and sequentially carrying out application performance test on the 7 groups of test pieces after 28 days;
and (3) compression test: according to GB/T50081-2019 'test method standard of concrete physical and mechanical properties', testing the compressive strength of a cube of 100mm multiplied by 100 mm;
and (3) impact resistance test: according to CECS 13-2009 Standard of fiber concrete test method, recording the impact frequency when a first crack occurs on the test piece as the initial crack impact frequency N1, and recording the impact frequency when the test piece contacts with any three of the four baffles of the impact frame as the damage impact frequency N2;
the concrete crack impact resistance energy consumption calculation formula: w1= N1mgh; w2= N2mgh, wherein: w1 and W2 are initial cracking and destructive impact energy consumption, J; n1 and N2 are the initial crack and damage impact frequency of the test piece; m is the mass of the impact hammer, kg; g is the gravity acceleration, and 9.81m/s2 is taken; h is the falling height of the impact hammer, 500mm.
The results of the application performance test on 7 test pieces are shown in table 3,
TABLE 3 application Performance test results
As can be seen from table 3, the anti-crack additives prepared in examples 1 to 6 have better effect of improving the compressive property of the concrete mortar than the control group because, when the modified or unmodified basalt fiber is added into the concrete mortar as a mineral fiber, the compatibility with the concrete mortar is good, so that the compressive property is improved compared with the control group;
example 3 compared with example 1, the use of modified basalt fiber and polyacrylic acid hydrogel as the high shrinkage additive in the formulation of the additive component is superior to the application performance of nano cellulose hydrogel as the high shrinkage additive, because when the modified basalt fiber and polyacrylic acid hydrogel are mixed in the additive component as the high shrinkage additive, the organization structure of the concrete mortar of the additive can be strongly shrunk, the concrete mortar with strong shrinkage and high energy density structure is formed, and the compression resistance and impact resistance of the concrete mortar are further improved.
As used in the specification and claims, certain terms are used to refer to particular components or methods. As one skilled in the art will appreciate, different regions may refer to a component by different names. The present specification and claims do not intend to distinguish between components that differ in name but not in name. In the following description and in the claims, the terms "include" and "comprise" are used in an open-ended fashion, and thus should be interpreted to mean "include, but not limited to. "substantially" means within an acceptable error range, and a person skilled in the art can solve the technical problem within a certain error range to substantially achieve the technical effect. The following description is of the preferred embodiment for carrying out the present application, but is made for the purpose of illustrating the general principles of the application and is not to be taken in a limiting sense. The protection scope of the present application shall be subject to the definitions of the appended claims.
It is also noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a good or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such good or system. Without further limitation, an element defined by the phrases "comprising one of 8230; \8230;" 8230; "does not exclude the presence of additional like elements in articles of commerce or systems including such elements.
While the foregoing description shows and describes several preferred embodiments of the invention, it is to be understood, as noted above, that the invention is not limited to the forms disclosed herein, but is not to be construed as excluding other embodiments and is capable of use in various other combinations, modifications, and environments and is capable of changes within the scope of the inventive concept as expressed herein, commensurate with the above teachings, or the skill or knowledge of the relevant art. And that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (5)
1. The concrete mortar anti-cracking additive is characterized by comprising the following raw materials in percentage by weight: 45-55% of fly ash, 8-12% of modified basalt fiber, 3-8% of high-shrinkage additive, 0.5-0.8% of air entraining agent, 2-5% of dispersing agent and the balance of water;
the high-shrinkage additive is polyacrylic acid hydrogel, the modified basalt fiber is prepared by performing surface modification on basalt fiber by using acid liquor, adding ground pulp of calcium acetate, rubber powder, sulfuric acid and water, adding magnesium chloride for reaction, slowly stirring, heating to 80-95 ℃, reacting for 0.5-1h, cooling the prepared mixed material to room temperature, washing, drying and grinding.
2. The concrete mortar anti-cracking additive as claimed in claim 1, wherein the dispersant is hydroxypropyl methylcellulose or sodium gluconate.
3. The concrete mortar crack resistance additive as claimed in claim 1, wherein the air-entraining agent is alkyl benzene sulfonate or fatty alcohol sulfonate.
4. A method for preparing the concrete mortar anti-crack additive as claimed in any one of claims 1 to 3, which mainly comprises the following steps:
firstly, accurately weighing raw materials with required dosage according to the component proportion of the anti-cracking additive;
step two, feeding the modified basalt fibers, the fly ash and the dispersing agent into a dry powder stirrer together, and uniformly stirring to obtain mixed dry powder;
and step three, adding a certain amount of water into a reaction kettle, putting the mixed dry powder obtained in the step two into the reaction kettle, adding an air entraining agent and a high shrinkage additive, slowly stirring, heating to 80-90 ℃, reacting for 1-2 hours, cooling the mixed material after the reaction to room temperature, washing, drying and grinding to obtain the concrete mortar anti-crack additive.
5. The method for producing the concrete mortar anti-crack additive according to claim 4, wherein in the third step, the granularity of the concrete mortar anti-crack additive is 45-100 meshes.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2530812C1 (en) * | 2013-08-13 | 2014-10-10 | Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Белгородский государственный технологический университет им. В.Г. Шухова" | Fine-grained cement concrete based on modified basalt fibre |
| CN109053023A (en) * | 2018-08-20 | 2018-12-21 | 潍坊纵横建材有限公司 | A kind of swelling fiber anti-crack water-proof agent |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2530812C1 (en) * | 2013-08-13 | 2014-10-10 | Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Белгородский государственный технологический университет им. В.Г. Шухова" | Fine-grained cement concrete based on modified basalt fibre |
| CN109053023A (en) * | 2018-08-20 | 2018-12-21 | 潍坊纵横建材有限公司 | A kind of swelling fiber anti-crack water-proof agent |
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