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Aluminosilicate-calcium sulphoaluminate sweller and making method thereof

A technology of calcium sulfoaluminate and aluminum silicate, applied in the field of concrete expansion agent, can solve the problems of limiting concrete expansion performance, strength, and poor activity

Inactive Publication Date: 2005-09-14
高振华 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The subsequent AEA expansion agent and CEA expansion agent are made of aluminate cement clinker and high aluminate cement clinker mixed with anhydrite grinding. Although their alkali content is low, their activity is poor and therefore Limit the expansion performance and strength of concrete

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Metakaolinite clinker 100 parts by weight

[0013] Calcium sulfoaluminate clinker 400 parts by weight

[0014] Gypsum 500 parts by weight

Embodiment 2

[0016] Metakaolinite clinker 100 parts by weight

[0017] Calcium sulfoaluminate clinker 350 parts by weight

[0018] Gypsum 550 parts by weight

Embodiment 3

[0020] Metakaolinite clinker 100 parts by weight

[0021] Calcium sulfoaluminate clinker 300 parts by weight

[0022] Gypsum 600 parts by weight

[0023] The manufacturing method of aluminosilicate calcium sulfoaluminate expansion agent in the present invention mainly includes two processes of preparing metakaolin clinker and calcium sulfoaluminate clinker and mixing and grinding. Metakaolinite clinker can be calcined kaolinite [Al 4 (Si 4 o 10 )(OH) 8 ] preparation, its calcination reaction formula is

[0024]

[0025] In order to ensure that the calcined product metakaolinite (2Al 2 o 3 2SiO2 2 ) quality, Al in kaolinite raw material 2 o 3 The SiO content should be above 30%, and the SiO content should be above 45%. In order to ensure that kaolinite is converted into metakaolinite after calcination and prevent kaolinite from being converted into chemically inactive silicon spinel (2Al2O3 2SiO2) and mullite (3Al2O3 2SiO2) due to excessive calcination tempera...

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PUM

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Abstract

The present invention relates to a concrete expansion agent is formed from metakaolinite clinker obtained by calcining kaolinite, calcium thioaluminate obtained by calcining high alumina cement raw material and gypsum through the processes of proportioning, mixing and grinding. The addition amount of said expansion agent only is 6-8%, and its alkali content is less than 0.6%, so that it is a low addition amount low alklai content concrete expansion agent.

Description

technical field [0001] The invention relates to a concrete expansion agent, in particular to an aluminosilicate calcium sulfoaluminate expansion agent with low content and low alkali content and a manufacturing method thereof. Background technique [0002] Press, concrete expansion agent is a new technology developed in the 1990s to prevent concrete shrinkage and cracking. Ordinary concrete will cause cracking due to shrinkage, which will not only directly affect the quality of anti-seepage works, but also cause steel bars to corrode and shorten the service life of reinforced concrete works. The concrete expansion agent made by mixing expansion clinker with gypsum and other auxiliary materials can produce a certain amount of expansive hydration crystal ettringite (C3A 3CaSO4 32H2O) after being added to ordinary concrete and mixed with water to make the concrete produce It expands moderately and establishes a certain prestress in the structure under the constraints, so as to...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B7/32C04B22/00C04B22/08C04B22/14
CPCC04B7/323C04B22/008
Inventor 高广立黄靖杨信符黎春海张鸿毓
Owner 高振华