高火山灰活性煅烧煤矸石添加量对水泥抗压强度的影响

摘要/Abstract

摘要： 为研究高火山灰活性下煤矸石添加量对水泥抗压强度影响,以龙岩翠屏山煤矿煤矸石为研究对象,分析了温度对煤矸石活性的影响以及煤矸石添加量对水泥强度的影响。结果表明:随着煅烧温度的增大,煤矸石烧失量在逐渐增大,烧失量与煅烧温度呈幂函数关系;随着煅烧温度的增大,煤矸石活性呈现先增大后减小的规律,煅烧煤矸石吸钙量与温度成二次多项式关系,推断实验煤矸石的煅烧最佳温度为750 ℃;随着煤矸石添加量的增加,水泥单轴抗压强度呈下降趋势,试件的抗压强度与煤矸石添加量成指数关系;随着龄期的增大,添加煤矸石的试件强度具有增长的趋势。研究结果对确定煤矸石添加量提供了理论依据,对指导煤矸石在凝胶材料中应用具有重要意义。

关键词: 煤矸石, 水泥, 煅烧活化, 火山灰活性, 烧失量, 抗压强度

Abstract: Comprehensive utilization of coal gangue is the fundamental method to solve the environmental and social problems caused by coal gangue. Coal gangue can be used as a gel material, which is an important mode for coal gangue comprehensive utilization. High reactivity is an essential characteristic for gel materials. Therefore, it is necessary to analyze the influence of high reactivity coal gangue on cement strength, especially the quantitative law. The gangue from Cuipingshan coal mine in Longyan was taken as the research object, and the calcined activation of coal gangue under different calcination temperatures was tested by pozzolanic reactivity evaluation method. The calcined coal gangue with high pozzolanic reactivity was used to make cement specimens, and the influence of coal gangue adding amount on cement compressive strength was analyzed. The results show that with the increase of calcination temperature, the loss on ignition of coal gangue increased gradually, and there is a power function relationship between the loss on ignition and the calcination temperature. With the increase of calcination temperature, the reactivity of coal gangue increases at first and then decreases. The relationship between calcium absorption and calcination temperature is quadratic polynomial. It is inferred that the optimal calcination temperature of experimental coal gangue is 750 ℃. With the increase of coal gangue adding amount, the compressive strength of cement specimens shows a downward trend, and the compressive strengths of specimens have an exponential relationship with the adding amount of coal gangue. With the increase of curing age, the compressive strengths of cement specimens have an increasing trend. The influence of coal gangue adding amount on cement compressive strength and the relationship between coal gangue adding amount and cement strength through data fitting, which provide a reference for coal gangue as cement admixture in other areas, and are of great significance in guiding the application of coal gangue in gel materials.

Key words: coal gangue, cement, calcined activation, pozzolanic reactivity, loss on ignition, compressive strength

中图分类号:

TQ172

刘谦, 郭玉森, 仲涛, 黄清云. 高火山灰活性煅烧煤矸石添加量对水泥抗压强度的影响[J]. 硅酸盐通报, 2021, 40(3): 936-942.

LIU Qian, GUO Yusen, ZHONG Tao, HUANG Qingyun. Effect of Adding Amount of Calcined Coal Gangue with High Pozzolanic Reactivity on Cement Compressive Strength[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(3): 936-942.

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