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High-strength composite fiber expansion anti-cracking agent and preparation process thereof

A technology of composite fiber and anti-cracking agent, which is applied in the field of concrete admixtures to achieve the effect of improving mechanical properties, improving space filling compactness and good expansion fineness

Pending Publication Date: 2021-10-29
南京晶磊兴建材有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with the traditional single expansion source, it is obvious that the staged and targeted expansion treatment effect is better, but the existing four-system three-expansion source anti-cracking agent still has some deficiencies, such as persistence, compression resistance, etc. There is room for improvement

Method used

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  • High-strength composite fiber expansion anti-cracking agent and preparation process thereof
  • High-strength composite fiber expansion anti-cracking agent and preparation process thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A high-strength composite fiber expansion anti-cracking agent, including CaO-MgO-Al 2 o 3 -SO 3 Expansion source, fibrous aggregate ore powder, modified fiber doped polymer sol solution, wherein, in terms of mass percentage, CaO-MgO-Al 2 o 3 -SO 3 50% of the expansion source, 25% of the ore powder of the fibrous aggregate, and 20% of the modified fiber doped polymer sol.

[0026] Further, 5% of dispersant is also included, and the dispersant is composed of hydroxypropyl methylcellulose and calcium fluorophosphate with a mass ratio of 1:0.2.

[0027] Among them, the ore powder of fibrous aggregates includes activated gypsum powder and wollastonite powder, the mass ratio of the two is 1:0.5, passed through a 800-mesh sieve, and the sieve residue is less than 5%. The preparation method of activated gypsum powder is as follows:

[0028] Take gypsum powder and grind it to pass through a 400 mesh sieve, then add citric acid to it, the amount of citric acid added is 5.3w...

Embodiment 2

[0035] A high-strength composite fiber expansion anti-cracking agent, including CaO-MgO-Al 2 o 3 -SO 3 Expansion source, fibrous aggregate ore powder, modified fiber doped polymer sol solution, wherein, in terms of mass percentage, CaO-MgO-Al 2 o 3 -SO 3 Expansion source 48%, fibrous aggregate ore powder 28%, modified fiber doped polymer sol 18%.

[0036] Further, 6% of dispersant is also included, and the dispersant is composed of hydroxypropyl methylcellulose and calcium fluorophosphate with a mass ratio of 1:0.1.

[0037] Among them, the ore powder of fibrous aggregates includes activated gypsum powder and wollastonite powder, the mass ratio of the two is 1:0.5, passed through a 800-mesh sieve, and the sieve residue is less than 5%. The preparation method of activated gypsum powder is as follows:

[0038] Take the gypsum powder and grind it to pass through a 400 mesh sieve, then add citric acid to it, the amount of citric acid added is 5.4wt% of the mass of the gypsum...

Embodiment 3

[0045] A high-strength composite fiber expansion anti-cracking agent, including CaO-MgO-Al 2 o 3 -SO 3 Expansion source, fibrous aggregate ore powder, modified fiber doped polymer sol solution, wherein, in terms of mass percentage, CaO-MgO-Al 2 o 3 -SO 3 Expansion source 45%, fibrous aggregate ore powder 25%, modified fiber doped polymer sol 22%.

[0046] Further, 8% of dispersant is also included, and the dispersant is composed of hydroxypropyl methylcellulose and calcium fluorophosphate with a mass ratio of 1:0.5.

[0047] Among them, the ore powder of fibrous aggregates includes activated gypsum powder and wollastonite powder, the mass ratio of the two is 1:0.5, passed through a 800-mesh sieve, and the sieve residue is less than 5%. The preparation method of activated gypsum powder is as follows:

[0048] Take gypsum powder and grind it to pass through a 400 mesh sieve, then add citric acid to it, the amount of citric acid added is 4.2wt% of the mass of gypsum powder,...

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Abstract

The invention relates to the technical field of concrete additives, and provides a high-strength composite fiber expansion anti-cracking agent and a preparation process thereof. The high-strength composite fiber expansion anti-cracking agent comprises, by mass, no less than 40% of a CaO-MgO-Al2O3-SO3 expansion source, no less than 25% of fibrous aggregate mineral powder and no less than 18% of modified fiber-doped polymer sol liquid. According to the invention, the physical and chemical properties of the composite fiber expansion anti-cracking agent are effectively improved through reasonable selection and matching of the raw materials, modification treatment and optimization of preparation steps, a doping amount is reduced, excellent compressive strength and an excellent expansion rate in a restrict condition are obtained, and high comprehensive practicability is achieved.

Description

technical field [0001] The invention relates to the technical field of concrete admixtures, in particular to a high-strength composite fiber expansion anti-cracking agent and a preparation process thereof. Background technique [0002] At present, the existing technology has deficiencies in the anti-cracking of concrete. It has not been able to construct the concrete showing resistance to shrinkage at different times in different ways from different levels. This is difficult to achieve the expected technical effect and not only increases the cost , and the problems of feeding risk and feeding accuracy caused by manual feeding have been highlighted. [0003] Fiber expansion agent is a new generation of multi-functional crack-resistant polymer fiber expansion agent in China. It is scientifically compounded with redispersible high molecular polymer, ternary expansion component and high-strength concrete accompanying fiber. Since the monofilament fibers in the polymer fiber ex...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/38
CPCC04B40/0039C04B24/383C04B22/126C04B22/064C04B22/143C04B22/08C04B16/0641C04B22/06
Inventor 张金凤胡裕添彭雄华
Owner 南京晶磊兴建材有限公司
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