煤矸石混凝土抗折强度试验研究
作者:
作者单位:

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

作者简介:

刘瀚卿(1994—),男,四川江油人,西安建筑科技大学博士生.E-mail: hqliu@xauat.edu.cn

通讯作者:

白国良(1955—),男,陕西渭南人,西安建筑科技大学教授,博士生导师,博士.E-mail: guoliangbai@126.com

中图分类号:

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)


Experimental Study on Flexural Strength of Coal Gangue Concrete
Author:
Affiliation:

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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    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.

    表 1 煤矸石的基本性能Table 1 Basic properties of coal gangue
    表 6 煤矸石混凝土试件的立方体抗压强度与抗折强度Table 6 Cubic compressive strength and flexural strength of coal gangue concrete specimens
    表 4 S矿煤矸石混凝土的配合比Table 4 Mix proportion of S coal gangue concretes
    表 2 煤矸石粗骨料累计筛余表Table 2 Cumulative sieve residue of coal gangue coarse aggregates
    图1 煤矸石粗骨料制备流程图Fig.1 Production process of coal gangue coarse aggregate
    图2 典型试件裂缝扩展形态Fig.2 Crack propagation pattern of typical specimen
    图3 典型试件折断面形态Fig.3 Broken section shape of typical specimen
    图4 各因素对煤矸石混凝土抗折强度的影响Fig.4 Influence of various factors on flexural strength of coal gangue concretes
    图5 煤矸石混凝土抗折强度理论值与试验值Fig.5 Calculated and test values of flexural strength of coal gangue concretes
    表 3 粗骨料的基本性能Table 3 Basic properties of coarse aggregates
    表 5 普通混凝土配合比Table 5 Mix proportions of normal concretes
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引用本文

刘瀚卿,白国良,朱可凡,刘辉,陈菲.煤矸石混凝土抗折强度试验研究[J].建筑材料学报,2023,26(4):346-352

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  • 收稿日期:2022-03-17
  • 最后修改日期:2022-07-08
  • 在线发布日期: 2023-05-08
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