CN110606683A - Cement anti-cracking reinforcing agent - Google Patents
Cement anti-cracking reinforcing agent Download PDFInfo
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- CN110606683A CN110606683A CN201910914283.3A CN201910914283A CN110606683A CN 110606683 A CN110606683 A CN 110606683A CN 201910914283 A CN201910914283 A CN 201910914283A CN 110606683 A CN110606683 A CN 110606683A
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- cement
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- cement mortar
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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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- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention relates to a cement crack resistance reinforcing agent, which comprises sulphoaluminate cement, an activating agent, magnesium oxide, montmorillonite, chopped polypropylene fiber, triisopropanolamine and a coagulation regulator, wherein the activating agent is metakaolin and ultrafine fly ash, and the coagulation regulator is citric acid and boric acid. The invention has the beneficial effects that: the performance of cement mortar is adjusted through multiple components, so that the cement can be quickly coagulated at normal temperature, the initial coagulation time is 90-120 min, and the final coagulation time is 200-250 min; the cement mortar has excellent mechanical properties, and the cement mortar can realize early strength, low drying shrinkage, crack resistance and the like by using the cement crack resistance reinforcing agent.
Description
Technical Field
The invention relates to the technical field of cement concrete application, in particular to a cement anti-cracking reinforcing agent.
Background
Concrete cracks can seriously affect the actual bearing capacity and the use safety of an engineering structure. In recent years, wall and ground cracks are the main types of cracks in building engineering, and good ground waterproofness is an important requirement for building use. The main causes of concrete cracks are as follows: the concrete shrinkage is aggravated due to the excessive use amount of the cementing material; for large-volume concrete, a large number of temperature and humidity cracks are generated due to overlarge difference between the inside temperature and the outside temperature; the obvious plastic shrinkage is caused by the too fast dehydration speed of the concrete surface; corrosion of the steel reinforcement and alkali-aggregate reactions lead to expansion which ultimately causes structural cracks.
Common treatment methods for concrete cracks include: surface treatment, filling, grouting, structural reinforcement, concrete replacement, electrochemical protection, and bionic self-healing.
In patent CN109956699A, phenylenediamine, hydroxyethyl acrylate, acrylic acid, calcium oxide, polylactic acid, added particles and other synthetic anti-cracking agents are adopted, so that the mechanical property, anti-cracking property and anti-shrinkage property of concrete are effectively improved.
In patent CN109796148A, the concrete crack-resistant waterproof agent is prepared from quartz powder of aluminum hydrate, modified wollastonite powder, phenolic resin hollow microspheres, tricalcium phosphate, six kinds of sodium phosphate, 2-amino-2-methyl-propanol, sodium thiocyanate, diethanol monoisopropanolamine, pentaerythritol and the like, and can reduce drying shrinkage, reduce crack generation, increase impermeability and prolong the service life of concrete.
In patent CN109704632A, polyquaternium-10 hydroxyethyl amino copolymerization, expansive soil, calcium magnesium mineral powder, furfural residue powder, polyurethane fiber, diatomite, trimethoxysilylpropyl polyethylene glycol modified single-end epoxy silicone oil and the like are adopted to prepare the concrete seepage-proofing crack-resisting agent, so that a remarkable crack-resisting effect can be generated under the condition of low doping amount, and the production cost of concrete is greatly reduced.
The common cement anti-cracking agent has more polymers in the components, is easy to cause poor workability, influences strength development and even causes secondary repair due to aging, and directly increases the construction cost.
Disclosure of Invention
The invention aims to provide a cement crack resistance reinforcing agent to overcome the defects in the prior art.
The technical scheme for solving the technical problems is as follows: the cement crack resistance reinforcing agent comprises sulphoaluminate cement, an activating agent, magnesium oxide, montmorillonite, chopped polypropylene fibers, triisopropanolamine and a coagulation regulator, wherein the activating agent is metakaolin and ultrafine fly ash, and the coagulation regulator is citric acid and boric acid.
In the scheme, the weight parts of the components are as follows:
sulphoaluminate cement: 50-100 parts of an activating agent: 30-60 parts of magnesium oxide: 6-12 parts of montmorillonite: 4-10 parts of short-cut polypropylene fiber: 15-30 parts of triisopropanolamine: 2-8 parts of coagulation regulating component: 4-12 parts.
In the above scheme, the sulphoaluminate cement is 42.5 strength grade sulphoaluminate cement.
In the scheme, the specific surface area of the fly ash is not less than 800-1000 m2/kg of ultrafine fly ash.
In the scheme, the mass ratio of the metakaolin to the fly ash is 2: 3-3: 2.
In the scheme, the magnesium oxide is lightly burned for 8 to 12 hours at the temperature of between 800 and 1000 ℃.
In the scheme, the mass ratio of the sodium gluconate to the boric acid is 1: 3-1: 1.
The invention has the beneficial effects that: the performance of cement mortar is adjusted through multiple components, so that the cement can be quickly coagulated at normal temperature, the initial coagulation time is 90-120 min, and the final coagulation time is 200-250 min; the cement mortar has excellent mechanical properties, wherein the flexural strength and the compressive strength of the cement mortar are respectively 7.2-9.5 MPa and 21-28 MPa in 3 days, and the flexural strength and the compressive strength of the cement mortar are respectively 12.6-14.7 MPa and 50-58 MPa in 28 days; the shrinkage of the cement mortar is obviously improved, and the drying shrinkage rate in 28 days is 0.028-0.034%; the cracking resistance of the cement mortar is remarkably improved, the fracture ratio of 3 days is 2.92-3.29, the fracture ratio of 28 days is 3.94-4.14, and the cement anti-cracking reinforcing agent is used, so that the early strength, low drying shrinkage, cracking resistance and the like of the cement mortar can be realized.
Detailed Description
The principles and features of this invention are described below in conjunction with examples which are set forth to illustrate, but are not to be construed to limit the scope of the invention.
The cement crack resistance reinforcing agent comprises sulphoaluminate cement, an activating agent, magnesium oxide, montmorillonite, chopped polypropylene fibers, triisopropanolamine and a coagulation regulator, wherein the activating agent is metakaolin and ultrafine fly ash, and the coagulation regulator is citric acid and boric acid.
The weight parts of the components are as follows:
sulphoaluminate cement: 50-100 parts of an activating agent: 30-60 parts of magnesium oxide: 6-12 parts of montmorillonite: 4-10 parts of short-cut polypropylene fiber: 15-30 parts of triisopropanolamine: 2-8 parts of coagulation regulating component: 4-12 parts. The sulphoaluminate cement is 42.5 strength grade sulphoaluminate cement; the specific surface area of the fly ash is not less than 800-1000 m2/kg of ultrafine fly ash; the mass ratio of the metakaolin to the fly ash is 2: 3-3: 2; the magnesium oxide is lightly burned for 8 to 12 hours at the temperature of between 800 and 1000 ℃; the mass ratio of the sodium gluconate to the boric acid is 1: 3-1: 1.
The early hydration speed of the sulphoaluminate cement is far higher than that of common Portland cement, and on one hand, the hydration of the cement is induced by forming ettringite crystals; on the other hand, hydration heat release can also accelerate cement hydration and promote the development of early strength of cement mortar;
poor fluidity is easily caused by too fast early hydration, and the sodium gluconate can lubricate cement particles through the surface adsorption effect to improve the fluidity of slurry; boric acid can effectively control the early hydration process through precipitation reaction, and reasonably regulate the coagulation of cement;
the sulphoaluminate cement hydration product ettringite can generate volume expansion, and the volume contraction of cement mortar can be relieved. The metakaolin and the ultrafine fly ash can reduce the shrinkage of the cement mortar through morphological effect. The volume expansion generated in the process of forming magnesium hydroxide in cement by light-burned magnesium oxide can be used for compensating the shrinkage of cement mortar;
the high toughness of the polypropylene fiber can change the brittle fracture characteristic of cement mortar, greatly reduce the fracture ratio of the cement mortar and improve the crack resistance of the cement mortar, and the introduction of metakaolin ensures that the cement mortar contains more free water, thereby promoting the occurrence of carbonization self-healing reaction when microcracks are generated.
The cement anti-cracking reinforcing agent contains a large amount of inorganic components, can realize the effects of increasing mechanical properties, improving anti-cracking performance, improving high brittleness and the like, and provides technical support for preventing cracking and prolonging engineering life.
Table 1 shows the proportion of each component of the cement crack resistance reinforcing agent in the embodiment of the invention:
TABLE 1
The effect of the cement anti-cracking reinforcing agent on the cement mortar is evaluated according to the standards of GB/T17671 Cement mortar strength detection method (ISO method), GB 175-2007 general Portland Cement, GB/T29417-2012 test method for the drying shrinkage cracking performance of cement mortar and concrete, and the like.
Table 2 shows the amount of the cement crack resistance enhancer used in examples 1 to 9 of the present invention, and the amount of the cement crack resistance enhancer added is usually 10 to 20% of the mass of the cement.
TABLE 2
Table 3 shows the performance parameters of examples 1 to 9 according to the invention.
TABLE 3
As can be seen from Table 3, the cement of examples 1 to 9 is accelerated to be set at normal temperature, the initial setting time is 90 to 120min, and the final setting time is 200 to 250 min; the cement mortar has excellent mechanical properties, wherein the flexural strength and the compressive strength of the cement mortar are respectively 7.2-9.5 MPa and 21-28 MPa in 3 days, and the flexural strength and the compressive strength of the cement mortar are respectively 12.6-14.7 MPa and 50-58 MPa in 28 days; the shrinkage of the cement mortar is obviously improved, and the drying shrinkage rate in 28 days is 0.028-0.034%; the cracking resistance of the cement mortar is remarkably improved, the fracture ratio of the cement mortar is 2.92-3.29 in 3 days, and the fracture ratio of the cement mortar is 3.94-4.14 in 28 days. By adopting the cement anti-cracking reinforcing agent, the early strength, low drying shrinkage and anti-cracking of the cement mortar can be realized, and the cement mortar has large-scale popularization value.
Although an application example of the present invention has been shown and described above, it should be understood that the above application example is illustrative and not to be construed as limiting the present invention, and those skilled in the art can make changes, modifications, substitutions and alterations to the above application example within the scope of the present invention.
Claims (7)
1. The cement crack resistance reinforcing agent is characterized by comprising sulphoaluminate cement, an activating agent, magnesium oxide, montmorillonite, chopped polypropylene fibers, triisopropanolamine and a coagulation regulator, wherein the activating agent is metakaolin and ultrafine fly ash, and the coagulation regulator is citric acid and boric acid.
2. The cement crack resistance reinforcing agent according to claim 1, characterized in that the components are in parts by weight:
sulphoaluminate cement: 50-100 parts of an activating agent: 30-60 parts of magnesium oxide: 6-12 parts of montmorillonite: 4-10 parts of short-cut polypropylene fiber: 15-30 parts of triisopropanolamine: 2-8 parts of coagulation regulating component: 4-12 parts.
3. A cement crack resistance enhancer as claimed in claim 1 or 2, wherein said sulphoaluminate cement is a 42.5 strength grade sulphoaluminate cement.
4. The cement crack resistance reinforcing agent according to claim 1 or 2, characterized in that the fly ash has a specific surface area of not less than 800-1000 m2/kg of ultrafine fly ash.
5. The cement crack resistance reinforcing agent according to claim 4, wherein the mass ratio of the metakaolin to the fly ash is 2: 3-3: 2.
6. The cement crack resistance reinforcing agent according to claim 1 or 2, characterized in that the magnesium oxide is lightly burned for 8-12 h at 800-1000 ℃.
7. The cement crack resistance reinforcing agent according to claim 1 or 2, wherein the mass ratio of the citric acid to the boric acid is 1:3 to 1: 1.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101486545A (en) * | 2008-12-15 | 2009-07-22 | 江苏博特新材料有限公司 | Expansion controllable ultra high-early strength support saddle mortar material |
| CN101905957A (en) * | 2010-08-16 | 2010-12-08 | 上海武冠新材料有限公司 | Concrete volume stable anti-cracking agent |
| CN102815883A (en) * | 2012-08-29 | 2012-12-12 | 河南铝城聚能实业有限公司 | Fiber composite capillary-crystalline expanding agent and preparation method thereof |
| KR101597080B1 (en) * | 2015-05-13 | 2016-03-07 | 이상현 | Fiber composition for reinforcing concrete |
| CN108358500A (en) * | 2018-03-31 | 2018-08-03 | 湖州五石科技有限公司 | A kind of concrete anti-cracking agent |
-
2019
- 2019-09-25 CN CN201910914283.3A patent/CN110606683A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101486545A (en) * | 2008-12-15 | 2009-07-22 | 江苏博特新材料有限公司 | Expansion controllable ultra high-early strength support saddle mortar material |
| CN101905957A (en) * | 2010-08-16 | 2010-12-08 | 上海武冠新材料有限公司 | Concrete volume stable anti-cracking agent |
| CN102815883A (en) * | 2012-08-29 | 2012-12-12 | 河南铝城聚能实业有限公司 | Fiber composite capillary-crystalline expanding agent and preparation method thereof |
| KR101597080B1 (en) * | 2015-05-13 | 2016-03-07 | 이상현 | Fiber composition for reinforcing concrete |
| CN108358500A (en) * | 2018-03-31 | 2018-08-03 | 湖州五石科技有限公司 | A kind of concrete anti-cracking agent |
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