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Pozzolanic Activity of Burned Coal Gangue and Its Effects on Structure of Cement Mortar
作者姓名:ZHANG  Changsen
作者单位:Material Engineering Department, Yancheng Institute of Technology, Yancheng 224003, China
基金项目:Funded by Social Development Plan in Science and Technology of Jiangsu Province (No. BS2006033)
摘    要:The pozzolanic activity of coal gangue burned at different burning temperatures was investigated. The burned coal gangue was mixed with portland cement in different proportions ( 20% - 60% ). The pozzolanic activity of coal gangue burned and the hydration products were examined, the compressive strengths of the pastes of the mixtures were tested, and the mechanism of the reaction was discussed. The experimental results slum, that the coal gangue burned at 750 ℃ has the optimum pozzolanic activity, and the burned coal ganguc with SiO2 and Al2 O3 is in an active form. When the coal gangue burned at 750℃ is mixed into portland cement, the content of calcium hydroxide in paste is significantly reduced, while the contents of hydrated calcium silk.ate and hydrated calcium aluminate are increased accordingly, hence resulting in the improvement of the microstructure of mortar. The compressive strength of cement paste decreases with increasing the content of burncd coal gangue. The decease in strength is small in the range of 20% - 30% coal gangue substitution and significant in 30%- 60% substitution.

关 键 词:凝硬性活性  脉石  水泥沙浆  结构
收稿时间:2005-01-12
修稿时间:2006-05-05

Pozzolanic activity of burned coal gangue and its effects on structure of cement mortar
ZHANG Changsen.Pozzolanic Activity of Burned Coal Gangue and Its Effects on Structure of Cement Mortar[J].Journal of Wuhan University of Technology. Materials Science Edition,2006,21(4):150-153.
Authors:Zhang Changsen
Affiliation:(1) Material Engineering Department, Yancheng Institute of Technology, 224003 Yancheng, China
Abstract:The pozzolanic activity of coal gangue burned at different burning temperatures was investigated. The burned coal gangue was mixed with portland cement in different proportions (20%–60%). The pozzolanic activity of coal gangue burned and the hydration, products were examined, the compressive strengths of the pastes of the mixtures were tested, and the mechanism of the reaction was discussed. The experimental results show that the coal gangue burned at 750 °C has the optimum pozzolanic activity, and the burned coal gangue with SiO2 and Al2O3 is in an active form. When the coal gangue burned at 750 °C is mixed into portland cement, the content of calcium hydroxide in paste is significantly reduced, while the contents of hydrated calcium silicate and hydrated calcium aluminate are increased accordingly, hence resulting in the improvement of the microstructure of mortar. The compressive strength of cement paste decreases with increasing the content of burned coal gangue. The decease in strength is small in the range of 20%–30% coal gangue substitution and significant in 30%–60% substitution. Funded by Social Development Plan in Science and Technology of Jiangsu Province (No. BS2006033)
Keywords:coal gangue  burn  pozzolanic activity  cement mortar  strength
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