Low-shrinkage-percentage resin mineral composite cement-based material and preparation method thereof

A technology of composite cement and low shrinkage, which is applied in the field of cement-based material modification, can solve the problems of reducing the physical and mechanical properties of hardened cement paste, increasing the porosity of cement-based materials, and the use of concrete that is prone to cracking, so as to improve the environment. And economic benefits, improve shrinkage cracking, reduce the effect of shrinkage

Inactive Publication Date: 2018-09-04
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] High-strength concrete has gradually been widely used due to its good working performance and mechanical properties, but low water-binder ratio will lead to obvious shrinkage, especially the rapid development of early hydration and easy cracking, etc., which have a great impact on the use of concrete , and the main reason for the formation of cracks in concrete structures is the shrinkage of cement paste, how to reduce the shrinkage of cement paste has become a hot research direction
[0003] Adding internal curing materials to cement-based materials can significantly reduce the early shrinkage of cement and reduce the risk of cracking. Among them, super absorbent resins are gradually being widely used because they can absorb a large amount of water in freshly mixed cement paste, and when the cement is hydrated Water can be gradually released in the later stage, thereby promoting the hydration of cement, but the incorporation of superabsorbent resin will increase the porosity of cement-based materials and reduce the physical and mechanical properties of hardened cement paste

Method used

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  • Low-shrinkage-percentage resin mineral composite cement-based material and preparation method thereof
  • Low-shrinkage-percentage resin mineral composite cement-based material and preparation method thereof
  • Low-shrinkage-percentage resin mineral composite cement-based material and preparation method thereof

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Embodiment 1

[0029] Raw material ratio: Portland cement accounts for 95wt.% of the total amount of cementitious materials, silica fume accounts for 2.5wt.% of the total amount of cementitious materials, and 0.4wt.% of super absorbent resin (SAP) is added externally. Carboxylic acid water reducing agent, the dosage is 0.6wt.% of the total amount of cement paste formed by mixing superabsorbent resin and water.

[0030] Preparation method: first add water to the stirring device, then add water reducing agent, and stir evenly; then add silica fume, then add cement, and finally add water-absorbing super absorbent resin, stir and place it on the mixer for 4 minutes .

[0031] Test situation: test the self-shrinkage of hardened cement paste within 7 days of age, and test the compressive strength of cement paste within 28 days of age. The test results are as figure 1 and figure 2 As shown, when the silica fume content is 2.5wt.%, the autogenous shrinkage of the hardened cement paste within 7 d...

Embodiment 2

[0033] Raw material ratio: Portland cement accounts for 97.5wt.% of the total cementitious material, silica fume accounts for 2.5wt.% of the total cementitious material, and 0.4wt.% superabsorbent resin (SAP) is added externally. The polycarboxylate water reducer is used in an amount of 0.6wt.% of the total amount of the cement paste mixed with superabsorbent resin and water.

[0034] Preparation method: first add water to the stirring device, then add water reducing agent, and stir evenly; then add silica fume, then add cement, and finally add water-absorbing super absorbent resin, stir and place it on the mixer for 4 minutes .

[0035] Test situation: test the self-shrinkage of hardened cement paste within 7 days of age, and test the compressive strength of cement paste within 28 days of age. The test results are as figure 1 and figure 2 It is shown that when the silica fume content is 5wt.%, the autogenous shrinkage of hardened cement paste within 7 days of age is signi...

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Abstract

The invention provides a low-shrinkage-percentage resin mineral composite cement-based material and a preparation method thereof. Self-shrinkage of concrete can be reduced easily, conveniently and rapidly, and the early cracking risk can be decreased effectively. The cement-based material is characterized by comprising cement, silica fume, super absorbent resin and water reducers. The cement and the silica fume are blended internally as cementing materials. The super absorbent resin and the water reducers are blended externally. In the cementing materials, the cement accounts for 97.5-95wt% while the silica fume accounts for 2.5-5wt%. The blending amount of the super absorbent resin is 0.2-0.4wt% of the cementing materials. The preparation method is characterized by including the steps offirstly adding water into a stirring device, blending the water reducers with the water, and evenly stirring the mixture; blending the silica fume and the cement with the mixture sequentially to obtain mixed sizing; evenly stirring the super absorbent resin and additional water, and blending the super absorbent resin and the additional water with the mixed sizing.

Description

technical field [0001] The invention belongs to the technical field of modification of cement-based materials, and in particular relates to a low-shrinkage resin mineral composite cement-based material and a preparation method thereof. technical background [0002] High-strength concrete has gradually been widely used due to its good working performance and mechanical properties, but low water-binder ratio will lead to obvious shrinkage, especially the rapid development of early hydration and easy cracking, etc., which have a great impact on the use of concrete , and the main reason for the formation of cracks in concrete structures is the shrinkage of cement paste, how to reduce the shrinkage of cement paste has become a hot research direction. [0003] Adding internal curing materials to cement-based materials can significantly reduce the early shrinkage of cement and reduce the risk of cracking. Among them, super absorbent resins are gradually being widely used because th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04
CPCC04B28/04C04B18/146C04B2103/302C04B24/2641
Inventor 桂雨黄睿廖宜顺郭大卫刘高鹏沈晴
Owner WUHAN UNIV OF SCI & TECH
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