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Fiber shrinkage-reducing and anti-cracking agent and preparation method thereof

An anti-crack agent and fiber technology, which is applied in the field of fiber shrinkage-reducing and anti-crack agent and its preparation, can solve the problems such as discount of anti-crack effect, poor stability, and inability to uniformly disperse fibers.

Active Publication Date: 2019-01-01
重庆源锦锦兴新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because the fibers are easy to agglomerate, the fibers cannot be uniformly dispersed in the concrete or mortar material, so that the anti-crack effect is greatly reduced and the stability is poor.

Method used

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  • Fiber shrinkage-reducing and anti-cracking agent and preparation method thereof
  • Fiber shrinkage-reducing and anti-cracking agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The fiber shrinkage and anti-cracking agent of the present embodiment is weighed according to the following proportioning ratio in terms of mass percentage:

[0025]Microporous fibers 2.5%, polypropylene fibers. The diameter of the microporous fiber is 60 μm, the diameter of the solid body part of the middle fiber is 40 μm, and the thickness of the outer microporous part is 20 μm. 120, the pores are not connected to each other;

[0026] The shrinkage reduction component is 0.8%, which is formed by mixing methyl vinyl ether-maleic anhydride copolymer and polyether polyol according to the mass ratio of 1:1.5;

[0027] Alum stone powder 45%, Al of alum stone powder 2 o 3 The content is 30%, the specific surface area is 400m 2 / kg, 1.18mm sieve residue is 0%;

[0028] 20% coal gangue powder, which is ground from spontaneous combustion coal gangue, with a specific surface area of ​​600m 2 / kg, the activity index was 80% in 28 days.

[0029] Gypsum 31.7%, is desulfuriz...

Embodiment 2

[0032] The fiber shrinkage and anti-cracking agent of the present embodiment is weighed according to the following proportioning ratio in terms of mass percentage:

[0033] Microporous fibers 1.5%, are polyester fibers. The diameter of the microporous fiber is 50 μm, the diameter of the solid body part of the middle fiber is 30 μm, and the thickness of the outer microporous part is 20 μm. 180, the pores are not connected to each other;

[0034] The shrinkage reduction component is 1%, which is formed by mixing methyl vinyl ether-maleic anhydride copolymer and polyether polyol according to the mass ratio of 1:2;

[0035] Alum stone powder 35%, Al of alum stone powder 2 o 3 The content is 35%, the specific surface area is 300m 2 / kg, 1.18mm sieve residue is 0~0.2%;

[0036] 25% coal gangue powder, which is ground from spontaneous combustion coal gangue, with a specific surface area of ​​500m 2 / kg, the activity index was 65% in 28 days.

[0037] Gypsum 37.5%, is dihydrate...

Embodiment 3

[0040] The fiber shrinkage and anti-cracking agent of the present embodiment is weighed according to the following proportioning ratio in terms of mass percentage:

[0041] Microporous fiber 1%, is polyester fiber. The diameter of the microporous fiber is 80 μm, the diameter of the solid body part of the middle fiber is 60 μm, and the thickness of the outer microporous part is 20 μm. 200, the pores are not connected to each other;

[0042] The shrinkage reduction component is 1%, which is a mixture of methyl vinyl ether-maleic anhydride copolymer and polyether polyol according to the mass ratio of 1:1.5-2.5;

[0043] Alum stone powder 30%, Al of alum stone powder 2 o 3 The content is 40%, the specific surface area is 200m 2 / kg, 1.18mm sieve residue is 0.5%;

[0044] Coal gangue powder 28%, ground from spontaneous combustion coal gangue, specific surface area 400m 2 / kg, the activity index was 50% in 28 days.

[0045] 40% gypsum is natural anhydrite. The purity of gyps...

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Abstract

The invention discloses a fiber shrinkage-reducing and anti-cracking agent and a preparation method thereof. The fiber shrinkage-reducing and anti-cracking agent is prepared from the following components in percentage by mass: 1 to 2.5 percent of micro-pore fibers, 0.5 to 1 percent of a shrinkage-reducing component, 30 to 45 percent of alunite powder, 20 to 30 percent of coal gangue powder and 30to 40 percent of gypsum; the shrinkage-reducing component is prepared by mixing a methyl vinyl ether-maleic anhydride copolymer and polyether glycol according to the mass ratio of 1 to (1.5 to 2.5); aplurality of micro-pores are formed in the surfaces of the micro-pore fibers, and the shrinkage-reducing component is adsorbed in the micro-pores by adopting a spraying drying method. According to the fiber shrinkage-reducing and anti-cracking agent, three types of anti-cracking materials are compounded to improve the anti-cracking capability of a concrete structure; the shrinkage-reducing component is adsorbed on the micro-pore fibers and a shrinkage-reducing effect is alleviated in a concrete hydration process; the micro-pore fibers and cement stones are more tightly combined and the earlytensile strength of concrete is increased; an expanded product is generated through the coal gangue powder, the alunite powder and the gypsum and the shrinkage of the concrete is compensated.

Description

technical field [0001] The invention relates to the field of anti-cracking additives for concrete structures, in particular, the invention provides a fiber shrinkage-reducing anti-cracking agent and a preparation method thereof. Background technique [0002] With the increasing number of construction projects, the problem of concrete shrinkage and cracking has become increasingly prominent, which has seriously affected the durability, bearing capacity and waterproof performance of concrete. There are three main reasons for cracks in concrete structures: one is caused by external loads, and the existence of such cracks is the most common, mainly due to problems such as unreasonable structural design, insufficient safety factor, lack of consideration of the possibility of construction, and insufficient structural rigidity; This kind of crack is caused by the secondary stress of the structure. Due to the discrepancy between the actual working state of the concrete structure and...

Claims

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Application Information

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IPC IPC(8): C04B24/32
CPCC04B40/0039C04B2103/60C04B16/0633C04B16/0625C04B16/0683C04B16/0691C04B14/4643C04B24/32C04B22/142C04B18/12C04B22/143
Inventor 王珺方博倪继华向君刘明宣张桂加
Owner 重庆源锦锦兴新材料科技有限公司
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