冻融劣化作用下煤矸石陶粒混凝土力学性能衰变规律研究  

Decay law of mechanical properties of coal gangue ceramsite concrete under freezing and thawing deterioration

作　　者：满晨 邱继生[2] 袁琳 MAN Chen;QIU Jisheng;YUAN Lin(School of Civil Engineering,Xi′an Jiaotong University,Xi′an 710300,China;School of Architecture and Civil Engineering,Xi′an University of Science and Technology,Xi′an 710054,China;Shanxi Lu′an Engineering Co.,Ltd.,Changzhi 046205,China)

机构地区：[1]西安交通工程学院土木工程学院,陕西西安710300 [2]西安科技大学建筑与土木工程学院,陕西西安710054 [3]山西潞安工程有限公司,山西长治046205

出　　处：《混凝土》2023年第4期74-77,共4页Concrete

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

摘　　要：为研究冻融劣化作用下,煤矸石陶粒混凝土力学性能的衰变规律,采用快冻法探究冻融次数和水灰比(0.35、0.45、0.55)对煤矸石陶粒混凝土抗压、抗折和劈裂抗拉强度等力学性能衰变规律的影响。此外,以冻融劣化下抗压强度损伤值为损伤变量,建立不同水灰比的煤矸石陶粒混凝土强度衰变模型。研究表明:煤矸石陶粒混凝土的力学性能与冻融次数成反比,即随着冻融次数增大,其力学性能逐渐降低。随着水灰比的增大,煤矸石陶粒混凝土的力学性能衰减幅度呈现逐渐增大趋势。建立的强度衰变模型符合性较好,精度较高。本研究成果可以为冻融劣化作用下煤矸石陶粒混凝土性能研究提供参考。In order to study the decay law of mechanical properties of coal gangue ceramsite concrete under freezing-thawing deterioration,the effects of freezing-thawing times and water-cement ratio(0.35,0.45 and 0.55)on the decay law of mechanical properties such as compressive strength,flexural strength and splitting strength of coal gangue ceramsite concrete were investigated by quick freezing method.In addition,the strength decay models of gangue ceramsite concrete with different water-cement ratios were established by taking the damage value of compressive strength under freezing and thawing deterioration as the damage variable.The results show that the mechanical properties of coal gangue ceramsite concrete are inversely proportional to the number of freezing-thawing times,that is,with the increase of freezing-thawing times,the mechanical properties decrease gradually.With the increase of water cement ratio,the attenuation range of mechanical properties of coal gangue ceramsite concrete increases gradually.The established intensity decay model has good consistency and precision.The research results can provide reference for the performance research of coal gangue ceramsite concrete under freezing and thawing deterioration.

关 键 词：水灰比 煤矸石陶粒混凝土 力学性能 损伤 强度衰变模型 

分 类 号：TU528.041[建筑科学—建筑技术科学]