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Application of modified water-absorbing resin as concrete antifreezing reinforcing material

A technology of water-absorbing resin and reinforcing material, applied in the field of building materials, can solve the problems of high frost resistance, high strength of concrete, easily burst air content of bubbles, etc., and achieve the effect of improving frost resistance, frost resistance and mechanical properties.

Active Publication Date: 2015-04-29
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Especially in concrete with a large amount of fly ash, or in high-cold and high-altitude areas, it can effectively overcome the problems of excessive air-entraining agent content, easy collapse of air bubbles and easy loss of air content, and solve the problems of high strength and high frost resistance of concrete. contradiction

Method used

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  • Application of modified water-absorbing resin as concrete antifreezing reinforcing material
  • Application of modified water-absorbing resin as concrete antifreezing reinforcing material
  • Application of modified water-absorbing resin as concrete antifreezing reinforcing material

Examples

Experimental program
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Effect test

Embodiment 1

[0031] The use of a modified water-absorbing resin as a concrete antifreeze reinforcing material, the modified water-absorbing resin is N-N' with a reverse phase suspension polymerization method, a water bath of 30 degrees Celsius, petroleum ether as a dispersed phase, and a weight percentage of 0.5%. Methylenebisacrylamide as a crosslinking agent, 0.6% by weight of persulfate as an initiator, spherical particles prepared by copolymerization of 88.9% by weight of acrylic acid monomer and 10% by weight of acrylamide .

[0032] A use of a modified water-absorbing resin as a frost-resistant reinforcing material for concrete, the steps of the preparation method of the modified water-absorbing resin are as follows:

[0033] ⑴In a water bath at 30°C, add acrylic acid monomer to a concentration of 5mol L while stirring -1 Carry out controlled neutralization reaction in sodium hydroxide solution;

[0034] (2) After neutralization, at 10°C, add acrylamide monomer to the solution in s...

Embodiment 2

[0045] The use of a modified water-absorbing resin as a concrete antifreeze reinforcing material, the modified water-absorbing resin adopts the reverse phase suspension polymerization method, the water bath is 50 degrees Celsius, and petroleum ether is used as the dispersed phase, and the weight percentage is 0.3% N-N' Methylenebisacrylamide as a crosslinking agent, 0.8% by weight of persulfate as an initiator, spherical particles prepared by copolymerization of 80% by weight of acrylic acid monomer and 18.9% by weight of acrylamide .

[0046] A use of a modified water-absorbing resin as a frost-resistant reinforcing material for concrete, the steps of the preparation method of the modified water-absorbing resin are as follows:

[0047] ⑴In a water bath at 50°C, add acrylic acid monomer to a concentration of 5mol L while stirring -1 Carry out controlled neutralization reaction in sodium hydroxide solution;

[0048] (2) After neutralization, at 5°C, add acrylamide monomer to ...

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Abstract

The invention relates to application of a modified water-absorbing resin as a concrete antifreezing reinforcing material. The modified water-absorbing resin is spherical particles prepared by a reversed phase suspension copolymerization method in a 30-50-DEG C water bath from the following components in percentage by weight: 0.3-0.5% of N-N'-methylene-bis acrylamide used as a crosslinking agent, 0.6-0.8% of persulfate used as an initiator, 80-90% of acrylic acid monomer and 10-20% of acrylamide; and petroleum ether is used as a disperse phase. The modified water-absorbing resin has the following characteristics: the particles are fine, the particle size does not exceed 120 mu m, the liquid absorption rate and liquid absorption capacity are very stable in different media, the maximum liquid absorption capacity does not exceed 25 times of the self weight, the diameter of micropores generated in hardened concrete is 2-3 times of that of the original particles, and the influence by Ca<2+> concentration and pH value is greatly lowered. The modified water-absorbing resin spherical particles are doped into the concrete in a dry doping mode, so that the workability of the concrete can be maintained, and the compression strength and especially freezing resistance are obviously improved.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to the application of a modified water-absorbing resin as concrete antifreeze reinforcing material. Background technique [0002] Concrete buildings will experience freeze-thaw damage in any environment where there are alternating positive and negative temperatures, and the interior of the concrete is saturated or partially saturated with water. The freeze-thaw cycle is one of the main causes of concrete damage in severe cold areas, and most of them occur in dams, roads, bridges and other buildings in contact with water. Since the mid-1930s, when pouring concrete in cold regions, the concept of air-entrained concrete has been the rule, without exception. However, the bubbles introduced by the air-entraining agent have a lifetime, and it is inevitable that the bubbles in the freshly mixed concrete will burst during the process of mixing, transportation, and pouring, resul...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/06C08F220/56C08F222/38C08F2/32C04B24/26
Inventor 何真杨华美刘加平蔡新华
Owner WUHAN UNIV
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