A method for improving shrinkage of alkali slag cementitious material

A technology of cementitious material and alkali slag, which is applied in the direction of cement production, etc., can solve the problems of large shrinkage of alkali slag cementitious materials, limit the popularization and application of alkali slag cementitious materials, etc., and achieve the effect of reducing shrinkage.

Active Publication Date: 2018-07-06
HARBIN INST OF TECH
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problem of large shrinkage of the alkali slag cementitious material and limit the popularization and application of the alkali slag cementitious material, the present invention proposes an improved Shrinkage method of alkali slag cementitious material

Method used

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Effect test

specific Embodiment approach 1

[0014] Embodiment 1: A method for improving the shrinkage of alkali slag cementitious material described in this embodiment is realized according to the following steps:

[0015] Step 1: Preparatory work: Weigh the slag according to the mixing ratio, and prepare an alkaline activator. The alkaline activator is sodium water glass. The modulus of the sodium water glass is 1.0-2.0, and sodium hydroxide is added to the sodium water glass. To adjust the water glass modulus, the mass ratio of slag to water glass is 1:X, and the value range of X is 0.2-0.4. Prepare the mold, and the mold size is between 100mm-500mm;

[0016] Step 2: Prepare the slurry of alkali slag cementitious material: pour the weighed slag and alkaline activator into a test piece through a mold, and the size of each side of the test piece is between 100mm-500mm;

[0017] Step 3: Specimen maintenance: Complete the maintenance of the poured specimens. The specimens should be cured for more than 3 days to ensure tha...

specific Embodiment approach 2

[0021] Specific embodiment two: a method for improving the shrinkage of the alkali slag cementitious material described in this embodiment, the test piece should be kept dry during the curing process of the third step, and the shrinkage of the test piece can be completed to the greatest extent, so that the alkali slag can be produced in the later stage The alkali slag cementitious material shrinks little or does not shrink when cementitious material member.

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Abstract

Provided is a method for relieving shrinkage of an alkali slag binding material. The invention relates to the method for relieving the shrinkage of the binding material, and aims to solve the problems that the shrinkage of the alkali slag binding material is big and the application and popularization of the alkali slag binding material are limited. On the premise that high strength and good resistance to high temperature of the alkali slag binding material are not influenced, the method for relieving the shrinkage of the alkali slag binding material is achieved. The method comprises the steps of conducting preparatory work; preparing neat paste of the alkali slag binding material; conducting sample maintaining; conducting sample crushing; preparing a component of the alkali slag binding material. The method for relieving the shrinkage of the alkali slag binding material is used in the technical field of civil engineering materials.

Description

technical field [0001] The invention relates to a method for reducing the shrinkage of cementitious materials, in particular to a method for improving the shrinkage of alkali slag cementitious materials. Background technique [0002] Ordinary Portland cement concrete is not suitable for high-temperature environments, because calcium carbonate in stones will decompose into calcium oxide at high temperatures, and calcium hydroxide, the hydration product of cement, will also decompose into calcium oxide. Alkali slag cementitious material is a cementitious material made of industrial by-product - granulated blast furnace slag as raw material, excited by an appropriate alkaline activator, and stirred. The final products of alkali slag cementitious materials include amorphous objects such as calcium silicate hydrate, hydrotalcite and tetracalcium aluminate hydrate, and do not contain substances that are easily decomposed at high temperatures such as calcium hydroxide. Therefore, a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B12/00C04B7/153
CPCC04B7/1535C04B12/005Y02P40/10
Inventor 郑文忠黄文宣王英周显煜
Owner HARBIN INST OF TECH
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