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Self-compacting concrete additive and preparation method thereof

A self-compacting concrete and admixture technology, applied in the field of concrete admixtures, to achieve the effect of improving the fluidity of the slurry, increasing the electrostatic repulsion, and improving the internal compactness

Active Publication Date: 2019-03-29
武汉惠帮地平工程有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

It can also effectively prevent cracks

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] This embodiment provides a self-compacting concrete admixture, including the following components in mass percentage: 25% of the volume stabilization component, 0.4% of the water reducing component, 50% of the lubricating component, 0.4% of the air-entraining component, and 24% of the anti-segregation component %, defoaming component 0.1%, dispersing component 0.1%;

[0041] The volume stabilizing component includes a medium-term volume stabilizing component before cement hardening and a volume stabilizing component in the middle and late stage of cement hardening; the mid-term volume stabilizing component before the cement hardening is composed of diisopropyl azodicarboxylate and polyoxyethylene Sorbitan fatty oleate and nano-zinc oxide are compounded, and the mass ratio of the diisopropyl azodicarboxylate to polyoxyethylene sorbitan fatty oleate and nano-zinc oxide is 100:1:10; The anti-segregation component is nano silicon dioxide.

[0042] The water-reducing compon...

Embodiment 2

[0053] The present embodiment provides a self-compacting concrete admixture. Compared with Embodiment 1, the difference is that the diisopropyl azodicarboxylate, polyoxyethylene sorbitan fatty acid oleate and nano zinc oxide The mass ratio is 200:3:15.

[0054] The self-compacting concrete additional component was prepared by the preparation method described in Example 1.

Embodiment 3

[0056] This embodiment provides a self-compacting concrete admixture. Compared with Embodiment 1, the difference is that the anti-segregation component is nano-silicon dioxide, hydrotalcite and water-soluble polymer compound in a mass ratio of 1:1 :1 compounded.

[0057] The self-compacting concrete additional component was prepared by the preparation method described in Example 1.

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Abstract

The invention discloses a self-compacting concrete additive which comprises the following components: a volume stabilizing component, a water reducing component, a lubricating component, an air entraining component, an anti-separation component, a de-foaming component and a dispersing component; the volume stabilizing component comprises a volume stabilizing component in early and medium stages ofcement hardening and a volume stabilizing component in medium and later stages of cement hardening.One or a combination of diisopropyl azodicarboxylate and diethyl azodicarboxylate is utilized to compound with polyoxyethylene sorbitan fatty acid ester and nano-zinc oxide, so that the volume in the early and medium stages of cement hardening is stable; light calcined magnesia, light calcined calcium oxide or anhydrous calcium sulphoaluminate are combined for keeping stable volume in the medium and later stages of cement hardening, so that stable volume of self-compacting concrete in the wholehardening period is realized; under the action of other components, the flow filling capacity of self-compacting concrete is greatly promoted, excellent filling adhesiveness is realized, concrete surface smoothness is promoted and surface defects are reduced; cracks can be effectively prevented.

Description

technical field [0001] The invention belongs to concrete admixture, in particular to a self-compacting concrete admixture and a preparation method thereof. Background technique [0002] At present, my country's concrete admixture industry is in a stage of rapid development. In order to meet the new technology and new requirements of concrete pouring, new functional requirements are also put forward for concrete admixtures. With the scarcity of experienced concrete pouring technicians, the labor cost of concrete pouring construction is gradually increasing, and construction companies have continuously improved the efficiency and quality of concrete pouring construction, and put forward the functional requirements of self-compacting concrete. However, the current water-reducing admixture can not meet the self-compacting performance of concrete, so a special self-compacting concrete admixture is needed. [0003] Chinese patent No. CN201810824610.1 discloses a self-compacting c...

Claims

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Application Information

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IPC IPC(8): C04B24/42
CPCC04B40/0039C04B24/32C04B22/06C04B24/24C04B22/0006C04B22/00C04B24/20C04B24/166C04B24/42C04B22/16
Inventor 吴杰周兴邦
Owner 武汉惠帮地平工程有限公司
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