Special cement and its production process

A technology of special cement and cement clinker, which is applied in the field of cement, can solve problems such as deformation and reduce the service life of concrete, and achieve the effects of low heat conduction, reduced wear rate, and improved early strength and later strength

Active Publication Date: 2005-07-20
TONGHUA SPECIAL CEMENT GROUP JILIN PROV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The alkali content in the cement is high, it will react with the active ingredients in the sand (called alkali aggregate reaction), causing the local volume of the concrete (concrete) to expand, causing deformation and cracks, and reducing the service life of the concrete

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Special cement It is made of the following raw materials in weight percentage: cement clinker 82%, slag 6%, fly ash 6%, gypsum 6%. The cement clinker is calcined from raw materials in the following weight percentages: 82% limestone, 6% loess, 6% silica or river sand, and 6% iron ore.

Embodiment 2

[0015] Special cement It is made of the following raw materials in weight percentage: cement clinker 79%, slag 7%, fly ash 7%, gypsum 7%. The cement clinker is calcined from raw materials in the following weight percentages: 79% of limestone, 7% of loess, 7% of silica or river sand, and 7% of iron ore.

Embodiment 3

[0017] Special cement It is made of the following raw materials in weight percentage: cement clinker 88%, slag 4%, fly ash 4%, gypsum 4%. The cement clinker is calcined from raw materials in the following weight percentages: 88% of limestone, 4% of loess, 4% of silica or river sand, and 4% of iron ore.

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PUM

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Abstract

The specific cement is produced with cement clinker, mineral slag, flyash and gypsum in certain weight proportion, and the cement clinker is produced with limestone, loess, silica and iron ore in certain weight proportion and through calcination. The production process of the specific cement includes high temperature calcination of raw material at 1400-1500 deg.c to produce cement clinker while controlling exhaust temperature not lower than 900 deg.c for exhausting alkali to alkali content not more than 0.4 %; and pulverizing cement clinker, mineral slag, flyash and gypsum while controlling specific surface area not smaller than 350 sq m / Kg to obtain the specific cement. The specific cement has low alkali content, high wear resistance, high strength, fast coagulation and other advantages.

Description

technical field [0001] The present invention relates to a kind of cement, namely special cement and its production process. Background technique [0002] In the prior art, the alkali content in ordinary cement is 1.2%-1.5%. The alkali content in the cement is high, it will react with the active ingredients in the sand (called alkali-aggregate reaction), causing the local volume of the concrete (concrete) to expand, causing deformation and cracks, and reducing the service life of the concrete. Therefore, reducing the alkali content in cement is an effective way to improve the quality of cement. Contents of the invention [0003] The purpose of the present invention is to provide a kind of special cement with low alkali content and production process for above-mentioned deficiency. [0004] The technical solution of the present invention is: special cement it is made of the raw material of following percentage by weight: cement clinker 79-88%, slag 4-7%, fly ash 4-7%, gyps...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B7/14C04B7/36
CPCY02P40/10
Inventor 李国昌赵凤利
Owner TONGHUA SPECIAL CEMENT GROUP JILIN PROV
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