A core-shell type sulphoaluminate cement-based high-strength lightweight aggregate and its preparation method

A technology of sulphoaluminate cement and lightweight aggregate, which is applied in the field of building materials, can solve the problems of inconspicuous thermal insulation effect and insufficient strength, and achieve the effects of improving the setting time too fast, enhancing the bearing capacity, and being widely used

Active Publication Date: 2021-10-22
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing ceramsite has not been widely used because of its high bulk density, insufficient strength, and inconspicuous thermal insulation effect.

Method used

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  • A core-shell type sulphoaluminate cement-based high-strength lightweight aggregate and its preparation method
  • A core-shell type sulphoaluminate cement-based high-strength lightweight aggregate and its preparation method
  • A core-shell type sulphoaluminate cement-based high-strength lightweight aggregate and its preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0038] A core-shell type sulphoaluminate cement-based high-strength lightweight aggregate, the specific preparation method is as follows:

[0039] 1) Weigh the raw material components according to the following proportions by mass: 100 parts of sulphoaluminate cement, 5 parts of ordinary Portland cement, 5 parts of fly ash, 6 parts of silica fume, 1 part of water reducer, and mix according to the proportion The above-mentioned raw materials are placed in a mixer and stirred evenly, and then according to the water-binder ratio of 0.38, the amount of water of standard consistency is added at room temperature, and the stirring is continued until uniform to obtain a sulphoaluminate cement-based cementitious material;

[0040] 2) Soak the fly ash ceramsite in tap water and keep the liquid level 5cm±0.5mm above the ceramsite particles. After pre-wetting treatment for 1 hour to reach the saturated water absorption state, place it in a sugar coating pan, and then spray the sulphoalumina...

Embodiment 2

[0043] A core-shell type sulphoaluminate cement-based high-strength lightweight aggregate, the specific preparation method is as follows:

[0044] 1) Weigh the raw material components according to the following proportions by mass: 100 parts of sulphoaluminate cement, 10 parts of ordinary Portland cement, 15 parts of fly ash, 2 parts of silica fume, 1 part of water reducer, and The above-mentioned raw materials are placed in a mixer and stirred evenly, and then according to the water-binder ratio of 0.38, the amount of water of standard consistency is added at room temperature, and the stirring is continued until uniform to obtain a sulphoaluminate cement-based cementitious material;

[0045] 2 Soak the fly ash ceramsite in tap water and keep the liquid level 5cm±0.5mm above the ceramsite particles. After pre-wetting treatment for 1 hour to reach the saturated water absorption state, place it in a sugar coating pan, and then spray the sulphoaluminate cement-based cementitious ...

Embodiment 3

[0048] A core-shell type sulphoaluminate cement-based high-strength lightweight aggregate, the specific preparation method is as follows:

[0049] 1) Weigh the raw material components according to the following proportions by mass: 100 parts of sulphoaluminate cement, 15 parts of ordinary Portland cement, 10 parts of fly ash, 6 parts of silica fume, 1 part of water reducer, and The above-mentioned raw materials are placed in a mixer and stirred evenly, and then according to the water-binder ratio of 0.38, the amount of water of standard consistency is added at room temperature, and the stirring is continued until uniform to obtain a sulphoaluminate cement-based cementitious material;

[0050] 2) Soak the fly ash ceramsite in tap water and keep the liquid level 5cm±0.5mm above the ceramsite particles. After pre-wetting treatment for 1 hour to reach the saturated water absorption state, place it in a sugar coating pan, and then spray the sulphoaluminate cement-based cementitious...

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Abstract

The invention relates to a core-shell type sulphoaluminate cement-based high-strength lightweight aggregate and a preparation method thereof. The base cementitious material is coated on the surface of the fly ash ceramsite to form a porous shell layer. The present invention selects appropriate cementitious materials to coat fly ash ceramsite to prepare core-shell type sulphoaluminate cement-based high-strength lightweight aggregate, which enhances the bearing capacity of light aggregate and improves the strength of light aggregate concrete. And by using ordinary Portland cement, fly ash, and silica fume as external admixtures, while improving the defects of sulphoaluminate cement such as too fast setting time and later strength shrinkage, the bonding between the core material and the shell material is strengthened. The overall strength of the core-shell lightweight aggregate concrete is obviously improved, and the lightweight aggregate concrete can be used more widely.

Description

technical field [0001] The invention belongs to the technical field of building materials, and relates to a core-shell type sulphoaluminate cement-based high-strength lightweight aggregate and a preparation method thereof. Background technique [0002] With the development of modern buildings with large spans and high-rises, in order to reduce the structural section, reduce the structural weight, and improve the thermal insulation performance of the structure, light, high-strength, durable and sustainable building materials have become an important research topic in the civil engineering field. It is also one of the important development directions of modern concrete technology. In order to solve the above problems, the development and preparation of lightweight high-strength aggregate concrete is of great significance. [0003] At present, the lightweight aggregates used in concrete are mainly artificially fired ceramsite materials. However, the existing ceramsite has too...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B20/10C04B18/02
CPCC04B20/1077C04B20/1066C04B20/1055C04B20/1029C04B18/027
Inventor 戴绍斌周铉棠张雨薇李正学李玉博
Owner WUHAN UNIV OF TECH
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