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A kind of self-contained water type concrete expansion agent and preparation method thereof

A technology of concrete and expansion agent, which is applied in the preparation of self-sufficient concrete expansion agent and in the field of self-sufficiency concrete expansion agent, which can solve the problems of increased drying shrinkage, difficulty in compensating the shrinkage effect of expansion agent, and decrease in concrete humidity, etc., to achieve improvement Anti-seepage performance, improvement of pumping construction performance, and effect of reducing friction

Active Publication Date: 2015-11-04
HUZHOU FENGSHENG NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the lack of sufficient curing water, the internal humidity of the concrete drops significantly, and the drying shrinkage increases. It is difficult for the expansion agent to exert its due shrinkage compensation effect, and the concrete still has the risk of shrinkage cracking

Method used

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  • A kind of self-contained water type concrete expansion agent and preparation method thereof
  • A kind of self-contained water type concrete expansion agent and preparation method thereof
  • A kind of self-contained water type concrete expansion agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A kind of self-sufficient concrete expansive agent embodiment 1 of the present invention comprises following components, and each component is by mass percentage:

[0032]

[0033]

[0034] The high-calcium-sulfur-aluminum clinker is the product of limestone, gypsum, bauxite, and iron powder calcined at a temperature of 1400°C, and includes the following components, each of which is by mass percentage:

[0035]

[0036] Among them, Loss represents loss on ignition, R 2 O represents an oxide of an alkali metal. The mass percent of free CaO in the high-calcium-sulfur-aluminum clinker is 35.1%.

[0037] The synergistic component is a powdered sodium polyacrylate water-absorbing resin, and the sodium polyacrylate water-absorbing resin passes through a 200-mesh sieve with a residue ≤ 5.0%, soaked in a NaCl solution with a mass fraction of 0.9% for 60 minutes, and the sodium polyacrylate absorbs water The salt water absorption rate of the resin is 20-40g / g, the wat...

Embodiment 2

[0039] A kind of self-sufficient concrete expansive agent embodiment 2 of the present invention comprises following components, and each component is by mass percentage:

[0040]

[0041] The preparation method of the high-calcium-sulfur-aluminum clinker, synergistic components and the self-contained concrete expansion agent is the same as that in Example 1.

Embodiment 3

[0042] A kind of self-sufficient concrete expansive agent embodiment 3 of the present invention comprises following components, and each component is by mass percentage:

[0043]

[0044] The preparation method of the high-calcium-sulfur-aluminum clinker, synergistic components and the self-contained concrete expansion agent is the same as that in Example 1.

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Abstract

The invention discloses a self-feeding water type cement expansive agent comprising the following components by weight percent: 45-65% of coal ash, 20-30% of high-calcium sulfur alumina clinker, 10-15% of anhydrite, 4-10% of limestone and 0.1-0.3% of a synergistic component, wherein the sum of the weight percent of the components is 100%. The invention also discloses a preparation method of the self-feeding water type cement expansive agent. A water absorption resin is introduced as the synergistic component to provide moisture required by the expansive agent in late hydration reaction, the expansive efficiency is greatly improved, and the concrete shrinkage crack risk caused by improper maintenance is obviously improved. In addition, on the premise that national standards are met, the usage amount of the expansive clinker can be reduced, resource consumption can be reduced, and the comprehensive utilization efficiency of mineral admixtures can be improved.

Description

technical field [0001] The invention belongs to the technical field of concrete additives, relates to a self-contained water-type concrete expansion agent, and also relates to a preparation method of the self-contained water-type concrete expansion agent. Background technique [0002] Using concrete expansion agent to prepare shrinkage-compensating concrete is one of the important methods to solve the leakage problem caused by shrinkage cracking of concrete. The current mainstream expansion agents mainly include calcium oxide expansion agents, calcium sulfoaluminate expansion agents and composite expansion agents. No matter what kind of expansion agent, its expansion mechanism is to form an expansion source through dissolution and crystallization or water absorption swelling, so that the concrete produces an expansion effect, that is, the expansion agent participates in the reaction inside the concrete to form an expansion product and produce volume deformation. Whether it ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/26C04B22/14
Inventor 部孝发吴文选
Owner HUZHOU FENGSHENG NEW MATERIAL
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