冻融作用下煤矸石陶粒混凝土力学性能衰减规律研究  

Degradation law of mechanical properties of coal gangue ceramsite concrete under freeze-thaw cycles

作　　者：邱继生[1] 王斌 关虓[1] 熊光红[1] 郭鹏[1] QIU Jisheng;WANG Bin;GUAN Xiao;XIONG Guanghong;GUO Peng(School of Architecture and Civil Engineering,Xi'an University of Science and Technology,Xi'an 710054,China)

机构地区：[1]西安科技大学建筑与土木工程学院,陕西西安710054

出　　处：《新型建筑材料》2020年第9期159-162,172,共5页New Building Materials

基　　金：国家自然科学青年科学基金项目(51808443);陕西省自然科学基础研究计划面上项目(2018JM5167);中国博士后科学基金项目(2017M613166)。

摘　　要：采用快速冻融法研究了冻融循环次数和煤矸石陶粒取代率对混凝土抗压、抗折及劈裂抗拉强度等力学性能的影响规律,并通过相对应冻融次数下的动弹性模量作为损伤变量,建立抗压、抗折和劈裂抗拉强度衰减理论模型。结果表明:冻融次数与煤矸石混凝土力学性能(抗压、抗折和劈裂抗拉)成负相关,且变化规律有所不同。建立的强度衰减理论模型与试验结果符合较好,具有较高的精度。The effects of freeze-thaw cycles and replacement rate of gangue ceramsite on the mechanical properties of con-crete,such as compressive strength,flexural strength and splitting tensile strength,were studied by rapid freeze-thaw method. The dynamic elastic modulus under the corresponding freeze-thaw times was used as the damage variable,and the theoretical model of compressive,flexural and splitting tensile strength attenuation was established. The results show that the freeze-thaw times are nega-tively correlated with the mechanical properties(compressive strength,flexural strength and splitting tensile strength) of gangue concrete,and the change law is different. The theoretical model of strength attenuation is in good agreement with the experimental re-sults and has high accuracy.

关 键 词：煤矸石陶粒混凝土 力学性能 损伤 强度衰减模型 

分 类 号：TU528.2[建筑科学—建筑技术科学]