Effect of Desulphurization Gypsum on the Strength and Microstructure of the Sludge Ash Cementitious System
[1]LU Qianming,WANG Xueqing,FU Shaojun,et al.Effect of Desulphurization Gypsum on the Strength and Microstructure of the Sludge Ash Cementitious System[J].Journal of Zhengzhou University (Engineering Science),2021,42(03):99-.[doi:10.13705/j.issn.1671-6833.2021.03.017]
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Journal of Zhengzhou University (Engineering Science)[ISSN
1671-6833/CN
41-1339/T] Volume:
42
Number of periods:
2021 03
Page number:
99-
Column:
Public date:
2021-05-10
- Title:
- Effect of Desulphurization Gypsum on the Strength and Microstructure of the Sludge Ash Cementitious System
- Keywords:
- desulphurization gypsum; sludge ash; compressive strength; microscopic analysis; hydration product
- CLC:
- -
- Abstract:
- In order to realize the resource utilization of sewage sludge ash, the effect of desulphurization gypsum on the strength and hydration products of the sewage sludge ash cementitious system at different stages was studied by means of paste strength measurement, X-ray diffraction, infrared spectroscopy, thermogravimetric analysis and scanning electron microscopy. The result showed that the hydration products of the sewage sludge ash cementitious system were mainly ettringite, portlandite and hydrated silicon aluminum (iron) calcium gel. Desulphurization gypsum promoted the early hydration of calcium silicate in the cementitious system, generated more hydration products, and improved the degree of polymerization of the hydrated gel and strength of the sample; at the later stage of hydration, desulphurization gypsum accelerated the alkali-induced reaction of cementitious system, promoting the formation of more gel phase. The microstructure of the cementing system was mainly composed of granular products with low development degree, and there were many holes in the structure. After adding desulfurization gypsum, a large number of plate-like calcium hydroxide and short rod ettringite crystals were produced, interlacing and filling in the interlayer space of the gel, which improved the compactness of microstructures and macroscopic strength.
- References:
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Last Update:
2021-06-24