煤矸石混凝土抗折强度试验研究  

Experimental Study on Flexural Strength of Coal Gangue Concrete

作　　者：刘瀚卿 白国良[1,2] 朱可凡 刘辉 陈菲 LIU Hanqing;BAI Guoliang;ZHU Kefan;LIU Hui;CHEN Fei(School of Civil Engineering,Xi'an University of Architecture and Technology,Xi'an 710055,China;Key Lab of Structural Engineering and Earthquake Resistance of Ministry of Education,Xi'an University of Architecture and Technology,Xi'an 710055,China;Northern Shaanxi Mining Co.,Ltd.,Yulin 719000,China;Shaanxi Coal Group Shenmu Ningtiaota Mining Co.,Ltd.,Yulin 719000,China)

机构地区：[1]西安建筑科技大学土木工程学院,陕西西安710055 [2]西安建筑科技大学结构工程与抗震教育部重点实验室,陕西西安710055 [3]陕西陕煤陕北矿业有限公司,陕西榆林719000 [4]陕煤集团神木柠条塔矿业有限公司,陕西榆林719000

出　　处：《建筑材料学报》2023年第4期346-352,377,共8页Journal of Building Materials

基　　金：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)。

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.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.

关 键 词：煤矸石混凝土 煤矸石粗骨料 影响因素 抗折强度 

分 类 号：TU528.09[建筑科学—建筑技术科学] TU317.1