煤矸石混凝土抗折强度试验研究

Experimental Study on Flexural Strength of Coal Gangue Concrete

摘要:

以榆神矿区煤矸石为粗骨料，通过288个棱柱体抗折强度试验，分析了煤矸石含碳量、煤矸石取代率及水灰比对煤矸石混凝土抗折强度的影响.结果表明：当不同矿源煤矸石含碳量由0.91%增加至2.09%时，煤矸石混凝土抗折强度降低了21.1%~32.6%；与普通混凝土相比，不同煤矸石取代率下煤矸石混凝土抗折强度降低了20.5%~47.5%；当水灰比由0.25增加至0.45时，煤矸石混凝土抗折强度降低了8.0%~15.3%.综合考虑了煤矸石含碳量和煤矸石取代率的影响，提出了适用于不同矿源煤矸石混凝土抗折强度的预测公式.

Abstract:

Using coal gangue from Yu-Shen mining area as coarse aggregate， through 288 prisms flexural strength tests， the effects of coal gangue carbon content， coal gangue replacement ratio and water-cement ratio on flexural strength of coal gangue concrete（CGC） were analyzed. The test results show that when the carbon content of coal gangue from different sources increases from 0.91% to 2.09%， the flexural strength of CGC decreases by 21.1%-32.6%. Compared with normal concrete， the flexural strength of CGC is reduced by 20.5%-47.5% under different coal gangue replacement ratios. Compared with CGC with water-cement ratio of 0.25， the flexural strength of CGC with water-cement ratio of 0.45 is reduced by 8.0%-15.3%. Considering the influence of carbon content and replacement ratio of coal gangue， the prediction formula of flexural strength of CGC suitable for different sources is proposed.