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Composite cement with large amount of coal gangue and its preparation method

A technology for compounding cement and coal gangue, applied in the field of building materials, can solve the problem of low activity of coal gangue, and achieve the effects of excellent durability, high strength and low environmental load

Inactive Publication Date: 2004-11-17
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with other solid wastes, the key to affecting the utilization of coal gangue industrial waste residue is that the activity of coal gangue is not high. How to stimulate its potential activity is the bottleneck restricting the utilization of coal gangue industrial waste residue

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] It is prepared by grinding each component into powder according to the above-mentioned preparation method, and then mixing according to the following weight ratio.

[0032] Gangue 50%

[0033] Portland cement clinker 41%

[0034] Special stimulant 6%

[0035] Gypsum coagulant 3%

[0036] Mineral Admixtures 0

[0037] The composite cement prepared in this example can reach the strength grade of 42.5, and the early and late strength development of the cement is good, and the durability is also very excellent.

Embodiment 2

[0039] It is prepared by grinding each component into powder according to the above-mentioned preparation method, and then mixing according to the following weight ratio.

[0040] Gangue 50%

[0041] Portland cement clinker 20%

[0042] Stimulant 7%

[0043] Gypsum coagulant 3%

[0044] Mineral admixture 20%

[0045] The composite cement prepared in this example can reach a strength grade of 32.5, the strength of the cement develops smoothly in the early and late stages, and the heat of hydration is very low.

Embodiment 3

[0047] It is prepared by grinding each component into powder according to the above-mentioned preparation method, and then mixing according to the following weight ratio.

[0048]Gangue 40%

[0049] Portland cement clinker 20%

[0050] Stimulant 7%

[0051] Gypsum coagulant 3%

[0052] Mineral admixture 30%

[0053] The composite cement prepared in this example can reach strength grade above 32.5, the early and late strength development of the cement is better, the heat of hydration is low, and the durability is excellent.

[0054] In the foregoing embodiments, the activator used can be composed of sodium hydroxide, calcium hydroxide, sodium silicate, potassium sodium silicate, etc.; the gypsum coagulation regulator used can be hemihydrate gypsum or dihydrate gypsum, etc.; Admixtures can be fly ash, slag powder, limestone powder, silica fume, etc.

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Abstract

The invention discloses a large mixing amount coal gangue composite cement comprising coal gangue, silicate cement clinker aggregate, exciting agent, gypsum coagulation regulating agent, mineral admixture by right weight portion through a finite process, wherein the content of coal gangue is 20-80% wt. The composite cement according to the invention can be used for making various concrete structure, in particular mass concrete structure.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a composite cement prepared by using coal gangue industrial waste residue and a preparation method thereof. Background technique [0002] my country's annual cement output has reached 800 million tons, of which about 600 million tons of high-temperature fired cement clinker, by 2010 my country's annual cement demand will exceed 1 billion tons. Cement production consumes a lot of resources and energy and seriously pollutes the environment. The performance of cement in our country is on the low side, resulting in a further increase in consumption. Social development requires cement to have better constructability, lower heat of hydration, higher strength, more stable volume, better corrosion resistance and durability. In addition, my country discharges more than 800 million tons of various solid industrial wastes every year, piling up like mountains, causin...

Claims

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Application Information

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IPC IPC(8): C04B7/02C04B7/04C04B7/24C04B7/42C04B22/00C04B28/02
CPCC04B28/02Y02W30/91C04B7/006C04B18/125
Inventor 王培铭蒋正武孙振平
Owner TONGJI UNIV
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