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Desulfurization gypsum concrete

A technology of desulfurized gypsum and desulfurized building gypsum, which is applied in the field of desulfurized gypsum concrete, can solve the problems of waste of support materials, slow setting time, and low flexural strength, and achieve reduced construction period, fast curing time, shear resistance and The effect of improving cracking ability

Active Publication Date: 2013-05-22
上海每天节能环保科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] What the present invention aims to solve are the problems of solid waste reuse and existing underground roadway supporting materials, such as large waste, slow setting time, large shrinkage, and low flexural strength

Method used

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  • Desulfurization gypsum concrete
  • Desulfurization gypsum concrete

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0070] 1. Masterbatch formula

[0071] Table 1

[0072]

[0073]

[0074] Mix the masterbatch according to the above formula, and stir evenly. Test its performance, the test data is as follows:

[0075] Table 2

[0076] performance parameters

standard test

Test Results

14 days flexural strength / Mpa

GB / T17671-1999

5.7

14 days compressive strength / Mpa

GB / T17671-1999

26.1

compressive strength softening factor

0.86

[0077] 2. Preparation of desulfurized gypsum concrete

[0078] Mix the masterbatch, medium sand, melon seeds with a fineness modulus greater than 2.5, and water at a volume ratio of 1:1.5:1.5:0.4, and stir evenly.

[0079] The performance test of the prepared gypsum sprayed concrete is carried out, and the test data are as follows:

[0080] table 3

[0081] performance parameters

Embodiment 2

[0083] 1. Masterbatch formula

[0084] Table 4

[0085] Desulfurization building gypsum

600 parts by weight

Slag powder

300 parts by weight

cement

100 parts by weight

[0086] alum

0.2 parts by weight

Defoamer

1.5 parts by weight

retarder

0.5 parts by weight

VAC / VeoVa copolymerized redispersible latex powder

1 part by weight

Cellulose ether

1 part by weight

[0087] Mix the masterbatch according to the above formula, and stir evenly. Test its performance, the test data is as follows:

[0088] table 5

[0089] performance parameters

standard test

Test Results

14 days flexural strength / Mpa

GB / T17671-1999

6.4

14 days compressive strength / Mpa

GB / T17671-1999

28.3

compressive strength softening factor

0.89

[0090] 2. Preparation of desulfurized gypsum concrete

[0091] Mix the masterbatch, medium san...

Embodiment 3

[0096] 1. Masterbatch formula

[0097] Table 7

[0098] Desulfurization building gypsum

[0099] Mix the masterbatch according to the above formula, and stir evenly. Test its performance, the test data is as follows:

[0100] Table 8

[0101] performance parameters

[0102] 2. Preparation of desulfurized gypsum concrete

[0103] Mix the masterbatch, medium sand, melon seeds with a fineness modulus greater than 2.5, and water at a volume ratio of 1:1.5:1.5:0.36, and stir evenly.

[0104] The performance test of the prepared gypsum sprayed concrete is carried out, and the test data are as follows:

[0105] Table 9

[0106] performance parameters

[0107] 28-day standard curing axial compressive strength standard value / Mpa

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Abstract

The invention discloses desulfurization gypsum concrete. The desulfurization gypsum concrete is characterized by comprising master batch, sand, chicken girt and water in a volume ratio of 1:(1.5-2):(1.5-2):(0.3-0.4); wherein the master batch comprises 300-950 weight parts of desulfurization building gypsum, 0-600 weight parts of ground slag, 50-100 weight parts of cement and 0-0.5 weight part of retarder. The desulfurization gypsum concrete can replace conventional concrete in current spraying materials, and gypsum base composite cementing material matched with the sand and stone is used for underground roadway support.

Description

technical field [0001] The invention relates to a desulfurized gypsum concrete, which belongs to the technical field of concrete. Background technique [0002] The domestic reutilization rate of desulfurized gypsum and other solid wastes produced by power plants is still limited, and the existing underground roadway support materials mainly use C15 and C20 concrete, and the cementitious material in concrete is generally cement. in: [0003] 1. Due to problems such as poor cohesion and high rebound rate of cement-based concrete, a large amount of it will be dropped during spraying, which will cause great waste (waste greater than 30%); [0004] 2. The setting time of cement-based concrete is slow, the strength rises slowly, and the construction period is long. If the final strength is reduced by adding accelerators, the effect is limited; [0005] 3. The cement shrinks greatly during the hydration process, which makes the concrete easy to crack; [0006] 4. The flexural st...

Claims

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Application Information

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IPC IPC(8): C04B28/14C04B18/12
CPCY02W30/91
Inventor 李涛宋洲
Owner 上海每天节能环保科技股份有限公司
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