非自燃煤矸石骨料混凝土抗冻性能研究  

Research on frost resistance of non-spontaneous combustion coal gangue aggregate concrete

作　　者：陈二忠[1,2] 管亚宁 魏少腾 高琦翔 王海 CHEN Erzhong;GUAN Yaning;WEI Shaoteng;GAO Qixiang;WANG Hai(College of Civil Engineering and Architecture,Hebei University,Baoding 071002,China;Technology Innovation Center for Testing and Evaluation in Civil Engineering of Hebei Province,Baoding 071002,China)

机构地区：[1]河北大学建筑工程学院,河北保定071002 [2]河北省土木工程监测与评估技术创新中心,河北保定071002

出　　处：《四川建材》2025年第1期22-27,共6页Sichuan Building Materials

摘　　要：为研究不同水灰比和非自燃煤矸石粗骨料取代率下非自燃煤矸石骨料混凝土的抗冻耐久性能,通过测试冻融后的非自燃煤矸石混凝土抗压强度、超声波波速、动弹性模量和质量,分析水灰比与取代率对非自燃煤矸石混凝土抗冻性能的影响规律;利用SEM对骨料与砂浆结合面进行扫描,分析非自燃煤矸石骨料混凝土冻融后微观损伤机理。研究结果表明,水灰比和非自燃煤矸石粗骨料取代率对冻融循环后混凝土的各项性能影响比较大,水灰比和非自燃煤矸石粗骨料取代率越高,抗冻性能越差;冻融循环次数达到100次时,水灰比高于0.45和非自燃煤矸石粗骨料取代率高于50%的试件已经严重损坏,无法测试其抗压强度,停止冻融;超声波比动弹性模量对冻融后非自燃煤矸石混凝土的损伤测定敏感;随着冻融次数的增加,粗骨料表面的孔隙和微裂缝不断加大,非自燃煤矸石粗骨料的变化更为显著,说明非自燃煤矸石混凝土的抗冻性能比普通混凝土差。In order to study the frost resistance durability of non-spontaneous combustion coal gangue aggregate concrete under different water-cement ratio and non-spontaneous combustion coal gangue coarse aggregate substitution rate,the influence of water-cement ratio and substitution rate on the frost resistance of non-spontaneous combustion coal gangue concrete is analyzed by testing the compressive strength,ultrasonic wave velocity,dynamic elastic modulus and quality of freeze-thawed non-spontaneous combustion coal gangue concrete;SEM was used to scan the interface between aggregate and mortar,and the micro damage mechanism of non-spontaneous combustion coal gangue aggregate concrete after freezing and thawing was analyzed.The results show that the water-cement ratio and the replacement rate of non-spontaneous combustion coal gangue coarse aggregate have a great influence on the properties of concrete after freeze-thaw cycle,the higher the water-cement ratio and the replacement rate of non-spontaneous combustion coal gangue coarse aggregate,the worse the frost resistance;when the number of freeze-thaw cycles reaches 100,the specimens with water-cement ratio higher than 0.45 and non-spontaneous combustion coal gangue coarse aggregate replacement rate higher than 50%have been seriously damaged,unable to test their compressive strength,and freeze-thaw shall be stopped;Ultrasonic specific dynamic elastic modulus is sensitive to the damage measurement of non-spontaneous combustion coal gangue concrete after freeze-thaw;with the increase of freeze-thaw times,the pores and micro cracks on the surface of coarse aggregate are increasing,and the change of non-spontaneous combustion coal gangue coarse aggregate is more significant,indicating that the frost resistance of non-spontaneous combustion coal gangue concrete is worse than that of ordinary concrete.

关 键 词：非自燃煤矸石 粗骨料取代率 抗冻性能 微观结构 力学性能 

分 类 号：TU528[建筑科学—建筑技术科学]