| 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. |
| 关键词: 煤矸石混凝土 煤矸石粗骨料 影响因素 抗折强度 |
| DOI：10.3969/j.issn.1007-9629.2023.04.002 |
| 分类号:TU528.09;TU317.1 |
| 基金项目:国家自然科学基金资助项目（52078410）；陕西省科技计划成果推广项目（2020CGHJ-017）；陕西省教育厅重点实验室项目（20JS071） |
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| Experimental Study on Flexural Strength of Coal Gangue Concrete |
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LIU Hanqing1,2, BAI Guoliang1,2, ZHU Kefan1, LIU Hui3, CHEN Fei4
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1.School of Civil Engineering， Xi'an University of Architecture and Technology， Xi'an 710055， China;2.Key Lab of Structural Engineering and Earthquake Resistance of Ministry of Education， Xi'an University of Architecture and Technology， Xi'an 710055， China;3.Northern Shaanxi Mining Co.， Ltd.， Yulin 719000， China;4.Shaanxi Coal Group Shenmu Ningtiaota Mining Co.， Ltd.， Yulin 719000， China
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| 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. |
| Key words: coal gangue concrete coal gangue coarse aggregate influencing factor flexural strength |
