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Anti-crack expanding agent and preparation method thereof

A technology of expansion agent and weight ratio, which is applied in the field of concrete additives, can solve the problems of decreased bonding strength, inapplicability in places with special requirements for strength and anti-seepage, and insignificant compensation for plastic shrinkage, so as to improve waterproof and anti-seepage. The effect of improving permeability and improving compactness

Active Publication Date: 2012-10-24
TIANJIN JINSHENGYUAN SPECIAL BUILDING MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current anti-cracking waterproofing agent has no obvious compensation effect on the plastic shrinkage in the early hardening process, and it is obviously not suitable for places with special requirements for strength and anti-seepage in particularly important projects and emergency projects.
Especially at present, the alkalinity of many expansion agents is high, which will cause the reaction with the alkali aggregate in the concrete, resulting in a decrease in the bonding strength, which has aroused people's high vigilance

Method used

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  • Anti-crack expanding agent and preparation method thereof
  • Anti-crack expanding agent and preparation method thereof
  • Anti-crack expanding agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Embodiment 1, in the present embodiment, the anti-crack expansion agent adopts the mass ratio of calcium oxide clinker 37%, gypsum 18%, dickite 34%, fly ash 7%, wollastonite powder 4% ratio, calcium oxide clinker , Gypsum, and dickite are ground to a certain fineness in a mill, and then mixed with fly ash and wollastonite powder. Or add 37% of calcium oxide clinker, 18% of gypsum, 34% of dickite, 7% of fly ash, and 4% of wollastonite powder into the mill for uniform grinding, and transport them to the homogenization warehouse for homogenization . Then the anti-crack expansion agent is obtained.

[0035] The calcium oxide clinker in this embodiment is a single substance obtained by calcining limestone powder above 1500°C, and its weight ratio and its components are as follows: SiO 2 6.95%, Al 2 o 3 5.50%; Fe 2 o 3 2.21%, CaO 82.04%, MgO 0.82%, loss on ignition 1.26%, and the balance is unavoidable impurities, and the weight percentage of free calcium oxide in th...

Embodiment 2

[0056] Embodiment 2, in the present embodiment, the anti-crack expansion agent adopts the mass ratio of calcium oxide clinker 39%, gypsum 19%, dickite 33%, fly ash 6%, wollastonite powder 3% ratio, calcium oxide clinker , Gypsum, and dickite are ground to a certain fineness in a mill, and then mixed with fly ash and wollastonite powder. Or add 39% of calcium oxide clinker, 19% of gypsum, 33% of dickite, 6% of fly ash, and 3% of wollastonite powder into the mill for uniform grinding, and transport it to the homogenization warehouse for homogenization . Then the anti-crack expansion agent is obtained. Other can refer to embodiment 1.

Embodiment 3

[0057] Embodiment 3, in the present embodiment, the anti-crack expansion agent adopts a mass ratio of calcium oxide clinker 36%, gypsum 20%, dickite 34%, fly ash 8%, wollastonite powder 2%, and calcium oxide clinker , Gypsum, and dickite are ground to a certain fineness in a mill, and then mixed with fly ash and wollastonite powder. Or add 36% of calcium oxide clinker, 20% of gypsum, 34% of dickite, 8% of fly ash, and 2% of wollastonite powder into the mill for uniform grinding, and transport them to the homogenization warehouse for homogenization . Then the anti-crack expansion agent is obtained. Other can refer to embodiment 1.

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Abstract

The invention discloses an anti-crack expanding agent which comprises the following ingredients by weight: 35%-40% of calcium oxide clinker, 15%-20% of gypsum, 30%-35% of dickite, 5%-10% of coal ash and 2%-5% of wollastonite powder, wherein the sum of the weight ratios is 100%. The invention further discloses a preparation method of the anti-crack expanding agent. Compared with the prior art, the anti-crack expanding agent disclosed by the invention has the advantages of being capable of effectively preventing concrete from cracking so as to improve compactness.

Description

technical field [0001] The invention relates to a concrete additive, in particular to an anti-crack expansion agent, and also relates to a preparation method of the anti-crack expansion agent. Background technique [0002] Concrete is the most widely used and most important basic material in construction engineering. It has achieved an irreplaceable position with its unique compressive strength, bonding strength, cast-in-place molding, water curing, firmness and durability. However, it also has very critical defects, such as: low tensile strength, small ultimate tensile strain, easy to form cracks during plastic shrinkage, resulting in insufficient anti-seepage ability, and directly hinders the strength index of the project in severe cases. Therefore, crack resistance and water seepage prevention are a long-term subject accompanying the application of concrete. The technical solution currently solved is to perform water reduction treatment according to the characteristics ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B22/14
Inventor 王珺胡百昌霍芳刘丽芳史福志王大军
Owner TIANJIN JINSHENGYUAN SPECIAL BUILDING MATERIALS
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