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Desulfurized gypsum super-sulfur cement concrete and preparation method thereof

A technology of desulfurized gypsum and supersulfur cement, which is applied in the manufacture of tools, ceramic molding machines, etc., can solve the problems of poor carbonation resistance, weak frost resistance, and low early strength, and achieve good carbonation resistance and high early strength , Improve the effect of compressive strength

Pending Publication Date: 2021-02-09
SOUTHEAST UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, concrete prepared with supersulfur cement generally has the disadvantages of low early strength, poor carbonation resistance, and weak frost resistance.

Method used

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  • Desulfurized gypsum super-sulfur cement concrete and preparation method thereof
  • Desulfurized gypsum super-sulfur cement concrete and preparation method thereof
  • Desulfurized gypsum super-sulfur cement concrete and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A method for preparing desulfurized gypsum supersulfur cement concrete. The raw materials used include: S75 grade slag powder, desulfurized gypsum whose main component is hemihydrate gypsum with a particle size of 15-20 microns; P.O.42.5 conch cement with a solid content of 50%. Polycarboxylate superplasticizer, sand with a particle size of less than 5mm, stone with a particle size of 5-16mm, water, and sodium lactate solution. Concrete preparation steps are as follows:

[0021] (1) Add 15kg of slag powder, 4kg of desulfurized gypsum powder, 1kg of cement, 27.6kg of sand, and 41.4kg of stone into the concrete mixer for stirring for about 1 minute; then add 100g of water reducing agent, 5.09kg of water and 400g of water while stirring Sodium lactate aqueous solution with a concentration of 60%, in which the water reducer is added and diluted with water, stirring for about 4 minutes; standing for about 30 seconds; finally adding the remaining 1.75kg of water, stirring for...

Embodiment 2

[0024] The basic steps are the same as in Example 1, the difference is that in the raw materials: the particle size of desulfurized gypsum whose main component is hemihydrate gypsum is 15 to 20 microns, the solid content of polycarboxylate water reducer is 50%, and sand with a particle size of less than 5mm , stone and water with a particle size of 5-16 mm. Carry out premixing treatment of cementitious material before step (1): put 15kg of slag powder, 4kg of desulfurized gypsum powder, and 1kg of cement in a mixer for mixing, and take it out after 10 minutes; then put 27.6kg of sand, 41.4kg of stone and the prepared The obtained cementitious material was added into a concrete mixer for mixing; the final sample obtained was recorded as SSC2, and the performance of the supersulfur cement concrete was tested. The mechanical performance test results are shown in Table 1, and the carbonation depth results are shown in Table 2.

Embodiment 3

[0026] The basic steps are the same as in Example 1, the difference is that in the raw materials: the particle size of desulfurized gypsum whose main component is hemihydrate gypsum is 15 to 20 microns, the solid content of polycarboxylate water reducer is 50%, and sand with a particle size of less than 5mm , stone and water with a particle size of 5-16mm. Carry out premixing treatment of cementitious material before step (1): put 15kg of slag powder, 4kg of desulfurized gypsum powder, and 1kg of cement in a mixer for mixing, and take it out after 10 minutes; then put 27.6kg of sand, 41.4kg of stone and the prepared The cementitious material that obtains is added in the concrete mixer and stirs; Add 5.01kg water and 480g concentration while stirring in step (1) and be the potassium lactate aqueous solution of 50%; The performance test results are shown in Table 1, and the carbonization depth results are shown in Table 2.

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Abstract

The invention discloses desulfurized gypsum super-sulfur cement concrete and a preparation method thereof. The desulfurized gypsum super-sulfur cement concrete is prepared from, by weight, 65-80 partsof slag powder, 15-20 parts of desulfurized gypsum, 5-15 parts of cement, 138-153 parts of sand, 189-207 parts of stone, 1-3 parts of lactic acid solution, 0.4-0.8 part of water reducing agent and 35-45 parts of water. The preparation method of the concrete comprises the following steps of: mixing the slag, the desulfurized gypsum, the cement, the sand and the stone; adding the water reducing agent, the water and the lactic acid solution; and then molding and curing the concrete to obtain the super-sulfur cement concrete. According to the method of the invention, the strength of the super-sulfur cement concrete at each age, especially the early strength, can be greatly improved; and the problem of false coagulation possibly occurring in the mixing process can be effectively solved.

Description

technical field [0001] The invention relates to a cement concrete and a preparation method thereof, in particular to a desulfurized gypsum supersulfur cement concrete and a preparation method thereof. Background technique [0002] At present, the annual emission of SO into the atmosphere from the burning of sulfur-containing fuels worldwide is 2 Up to about 200 million tons. Compared with natural gas and oil, coal has lower calorific value and higher sulfur content, and the combustion of coal intensifies the SO 2 emissions. SO 2 The biggest problem caused by the emission of acid rain is the generation of acid rain, which in turn causes the destruction of ecological vegetation, acidification of soil and water, and corrosion of buildings, which has many adverse effects on the ecological environment and human life. In recent years, with the increasing emphasis on environmental protection, efforts have been made to control the atmosphere, especially for SO 2 Emissions are s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/14C04B24/06B28B1/00B28B11/24
CPCC04B28/144C04B24/06B28B1/00B28B11/245C04B2201/50C04B18/141C04B7/02C04B2103/302C04B14/06C04B22/002C04B14/00
Inventor 周扬彭泽川陈鲁川王亮孙启亮马涛黄家乐
Owner SOUTHEAST UNIV
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