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High-performance concrete inner curing material realizing sustained and controlled release of water and preparation method of inner curing material

A technology of high-performance concrete and water release, which is applied in the field of high-performance concrete slow-controlled water-release internal curing materials and its preparation, and concrete internal curing agents, which can solve the problems of difficult control of the water release rate of internal curing materials and reduce the strength of concrete. Achieve the effects of increasing thermal stability and water retention capacity, reducing cracking and improving work performance

Active Publication Date: 2018-04-20
CHANGAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the deficiencies in the prior art, the object of the present invention is to provide a high-performance concrete slow-controlled water release internal curing material and its preparation method, which solves the difficulty in controlling the water release rate of the existing internal curing materials and reduces the water release rate of concrete. technical issues of strength

Method used

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  • High-performance concrete inner curing material realizing sustained and controlled release of water and preparation method of inner curing material

Examples

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Effect test

Embodiment 1

[0041] The present embodiment provides a kind of high-performance concrete slow and controlled release water internal curing material, by weight fraction, is made of the following raw materials: 17.5% metakaolin, 12% diatomite, 9% graphene oxide, 7% % silane coupling agent, 3.5% sodium alginate, 5% xanthan gum, 3% slaked lime, 2.74% sodium acetate, 27% sodium acrylate, 12.5% ​​2-acrylamide-2-methyl Propanesulfonic acid, 0.06% crosslinker, 0.7% initiator.

[0042] In this example:

[0043] The particle size of metakaolin is 1500 mesh, SiO in metakaolin 2 The content is 40% to 60%.

[0044] The particle size of diatomite is 300 mesh, SiO in diatomite 2 The content of Fe is 80% to 90%. 2 o 3 Content≤1.2%.

[0045] The silane coupling agent is 3-aminopropanetriethoxysilane.

[0046] The particle size of slaked lime is 325 mesh, Ca(OH) in slaked lime 2 content ≥ 90%.

[0047] The crosslinker is made of polyvinyl alcohol and glycerin in a 1:1 weight ratio. The polyvinyl al...

Embodiment 2

[0062] This embodiment provides a kind of high-performance concrete slow and controlled release water interior curing material, is made of the following raw materials in terms of weight fraction: 17% metakaolin, 11% diatomite, 9.5% graphene oxide, 7.5% % silane coupling agent, 3.5% sodium alginate, 5.5% xanthan gum, 2.5% hydrated lime, 1.63% sodium acetate, 28% sodium acrylate, 13% 2-acrylamide-2-methyl Propanesulfonic acid, 0.07% crosslinker, 0.8% initiator.

[0063] The kind and consumption requirement of each raw material in the present embodiment are identical with embodiment 1.

[0064] The preparation method of the high-performance concrete slow-controlled release water internal curing material in this embodiment is basically the same as that in Embodiment 1.

[0065] The performance test process of this embodiment is basically the same as that of Example 1, and the content of the internal curing material is 0.5% of the cement content. The performance test results of th...

Embodiment 3

[0067] This embodiment provides a kind of high-performance concrete slow and controlled release water internal curing material, by weight fraction, made of the following raw materials: 20% metakaolin, 10% diatomite, 8% graphene oxide, 6 % silane coupling agent, 4% sodium alginate, 6% xanthan gum, 4% slaked lime, 0.95% sodium acetate, 30% sodium acrylate, 10% 2-acrylamide-2-methyl Propanesulfonic acid, 0.05% crosslinker, 1% initiator.

[0068] The kind and consumption requirement of each raw material in the present embodiment are identical with embodiment 1.

[0069] The preparation method of the high-performance concrete slow-controlled release water internal curing material in this embodiment is basically the same as that in Embodiment 1.

[0070] The performance test process of this embodiment is basically the same as that of Embodiment 1, and the performance test results of this embodiment are shown in Table 1.

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Abstract

The invention provides a high-performance concrete inner curing material realizing sustained and controlled release of water and a preparation method of the inner curing material. The inner curing material comprises the following raw materials: sodium alginate, xanthan gum, hydrated lime, sodium acetate, sodium acrylate, 2-acrylamide-2-methylpropanesulfonic acid, a cross-linking agent and an initiator, and also includes an organically modified metakaolin-diatomite-graphene oxide compound, wherein the organically modified metakaolin-diatomite-graphene oxide compound includes the following materials: metakaolin, diatomite, graphene oxide and a silane coupling agent. The inner curing material of the invention can significantly improve the compressive strength of concrete, and the 28-day compressive strength of concrete is 120% or more of the benchmark concrete strength. The 60-min concrete fluidity is significantly improved. In addition, the self-shrinkage of concrete can also be greatlyreduced. The inner curing material of the invention effectively solves the problems that the water release rate of a current inner curing material is difficult to control and the strength of concreteis reduced.

Description

technical field [0001] The invention belongs to the field of building materials, and relates to a concrete internal curing agent, in particular to a high-performance concrete slow-controlled release water internal curing material and a preparation method thereof. Background technique [0002] Due to its excellent mechanical properties, high-performance concrete can greatly increase the bearing capacity of components, or reduce the size of the component section when the bearing capacity is constant, thereby saving raw materials and improving the aesthetic effect of the building. Therefore, high-performance concrete has been widely used in high-rise buildings, long-span bridges and other projects. The biggest feature of high-performance concrete is the low water-binder ratio. The concrete structure is prone to large deformation due to self-shrinkage, which leads to the generation and cracking of high-strength concrete internal cracks, and the mechanical properties and durabili...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/16C04B20/10C04B14/10C04B14/02C04B14/08
CPCC04B20/1051C04B40/0039C04B14/106C04B14/024C04B14/08C04B24/168
Inventor 何锐谈亚文陈华鑫王铜黄鑫杨哲龙景潭
Owner CHANGAN UNIV
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