Core-shell type sulphoaluminate cement-based high-strength lightweight aggregate and preparation method thereof

A technology of sulfoaluminate cement and lightweight aggregate, applied in the field of building materials, can solve the problems of insignificant thermal insulation effect and insufficient strength, and achieve the effects of improving the setting time too fast, enhancing the bearing capacity, and being easy to achieve.

Active Publication Date: 2019-12-03
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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  • Core-shell type sulphoaluminate cement-based high-strength lightweight aggregate and preparation method thereof
  • Core-shell type sulphoaluminate cement-based high-strength lightweight aggregate and preparation method thereof
  • Core-shell type sulphoaluminate cement-based high-strength lightweight aggregate and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

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

[0039] 1) Weigh the raw material components according to the following parts 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 reducing agent, The above-mentioned raw materials are placed in a mixer and mixed evenly, and then the standard consistency water is added at room temperature according to the water-binder ratio of 0.38, and the mixing is continued until the sulfoaluminate cement-based cementing material is uniform;

[0040] 2) Soak the fly ash ceramsite in tap water and keep the liquid level 5cm±0.5mm above the ceramsite particle. After the pre-wetting treatment reaches the saturated water absorption state for 1 hour, it is placed in the sugar-coated pan, and then the sulphoaluminate cement-based cementitious material obtained in step 1) is spra...

Embodiment 2

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

[0044] 1) Weigh the raw material components according to the following parts 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 reducing agent, The above-mentioned raw materials are placed in a mixer and mixed evenly, and then the standard consistency water is added at room temperature according to the water-binder ratio of 0.38, and the mixing is continued until the sulfoaluminate cement-based cementing material is uniform;

[0045] 2 Soak the fly ash ceramsite in tap water and keep the liquid level 5cm±0.5mm above the ceramsite particle. After the pre-wetting treatment reaches the saturated water absorption state for 1 hour, it is placed in the sugar-coated pan, and then the sulphoaluminate cement-based cementitious material obtained in step 1) is spr...

Embodiment 3

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

[0049] 1) Weigh the raw material components according to the following parts 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 reducing agent, The above-mentioned raw materials are placed in a mixer and mixed evenly, and then the standard consistency water is added at room temperature according to the water-binder ratio of 0.38, and the mixing is continued until the sulfoaluminate cement-based cementing material is uniform;

[0050] 2) Soak the fly ash ceramsite in tap water and keep the liquid level 5cm±0.5mm above the ceramsite particle. After the pre-wetting treatment reaches the saturated water absorption state for 1 hour, it is placed in the sugar-coated pan, and then the sulphoaluminate cement-based cementitious material obtained in step 1) is sp...

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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. With the high-strength lightweight aggregate, a lightweight and high-strength spherical fly ash ceramsite is used as a core; and a sulphoaluminate cement-based cementitious material is coated onto the surface of the fly ash ceramsite to form a shell layer with a porous structure. According to the invention, a proper cementitious material is selected to be coated onto the fly ash ceramsite to prepare the core-shell type sulphoaluminate cement-based high-strength lightweight aggregate, so the bearing capacity of a light aggregate is reinforced, and the strength of light aggregate concrete is improved; meanwhile, by using of ordinary portland cement, fly ash and silica fume as additives, the defects like over-rapid setting time and later-stage strength shrinkage of sulphoaluminate cement are improved, and the bonding strength of a core material anda shell material is reinforced, so the overall strength of core-shell type lightweight aggregate concrete is significantly improved, and the light aggregate concrete can be more extensively applied.

Description

Technical field [0001] The invention belongs to the technical field of building materials and relates to a core-shell type sulfoaluminate cement-based high-strength lightweight aggregate and a preparation method thereof. Background technique [0002] With the development of modern buildings to large-span and high-rise buildings, in order to reduce structural cross-sections, reduce structural weight, and improve structural thermal insulation performance, lightweight, high-strength, durable, and sustainable building materials have become an important research topic in civil engineering. 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 and 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 high bulk de...

Claims

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Application Information

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Patent Type & Authority Applications(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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