煤矸石细骨料混凝土力学性能及抗冻性能研究  

Research on the mechanical and frost resistance properties of coal gangue fine aggregate concrete

作　　者：黄久双 董国庆 彭龙贵[3] 郑斌 杨晓凤[1] 张凯峰 HUANG Jiushuang;DONG Guoqing;PENG Longgui;ZHENG Bin;YANG Xiaofeng;ZHANG Kaifeng(Xi'an University of Architecture and Technology,Xi'an 710055,China;CRRC Shandong Wind Power Co.Ltd.,Qingdao 266000,China;Xi'an University of Science and Technology,Xi'an 710054,China;China Western Construction North Co.Ltd.,Xi'an 710076,China;Chang'an University,Xi'an 710064,China)

机构地区：[1]西安建筑科技大学,陕西西安710055 [2]中车山东风电有限公司,山东青岛266000 [3]西安科技大学,陕西西安710054 [4]中建西部建设北方有限公司,陕西西安710076 [5]长安大学,陕西西安710064

出　　处：《新型建筑材料》2025年第3期123-127,共5页New Building Materials

基　　金：陕西省科技厅项目(2024QCY-KXJ-053)。

摘　　要：采用煤矸石细骨料等体积替代河砂,研究了不同替代率下煤矸石细骨料混凝土的工作性能、力学性能和抗冻性能,并建立了煤矸石细骨料混凝土的冻融损伤模型。结果表明:与基准混凝土相比,替代率为100%时,煤矸石细骨料混凝土的坍落度减小了31.7%,7、28 d抗压强度分别降低了32.2%、43.6%,经100次冻融循环后,试件的相对动弹性模量仍达到76.62%,抗冻等级仍大于F100。根据试验结果建立了煤矸石细骨料混凝土冻融损伤理论模型,可以进行有效预测,为有抗冻性能需求的煤矸石混凝土工程提供技术参考。Replacing river sand with coal gangue fine aggregate of equal volume,this study investigates the workability,mechanical properties,and frost resistance of coal gangue fine aggregate concrete under different replacement ratios.A freeze-thaw damage model for coal gangue fine aggregate concrete was established.The results show that when the replacement ratio is 100%,the slump of coal gangue fine aggregate concrete decreases by 31.7%compared to the reference concrete,while the 7,28 d compressive strengths decrease by 32.2%and 43.6%,respectively.However,after 100 freeze-thaw cycles,the dynamic elastic modulus of the specimens with 100%fine aggregate replacement still reached 76.62%,indicating that the frost resistance grade of the concrete under this mix proportion exceeds F100.A theoretical model for freeze-thaw damage of coal gangue fine aggregate concrete was established based on experimental results,which can effectively predict the damage,providing technical reference for coal gangue concrete engineering requiring frost resistance.

关 键 词：煤矸石 细骨料 混凝土 抗冻性能 冻融损伤模型 

分 类 号：TU528.041[建筑科学—建筑技术科学]