沙漠地区混凝土强度与抗裂性能规律研究  

Strength and Crack Resistance of Concrete in Desert Area Law Study

作　　者：康健[1] 刘建勋 张戎令[1,2] 赵文斌[1] 赵永鹏 

机构地区：[1]兰州交通大学甘肃省道路桥梁与地下工程重点实验室,兰州730070 [2]道桥工程灾害防治技术国家地方联合工程实验室,兰州730070 [3]甘肃路桥建设集团有限公司,兰州730070

出　　处：《硅酸盐通报》2017年第7期2178-2185,共8页Bulletin of the Chinese Ceramic Society

基　　金：青年人才托举工程(2015QNRC001);长江学者和创新团队发展计划滚动支持(IRT_15R29);甘肃省基础研究创新群体(145RJIA332);兰州交通大学(201606)优秀平台

摘　　要：为研究沙漠地区不同养护方式下混凝土强度发展规律和不同强度等级混凝土抗裂性能,采用C35和C50混凝土在施工现场进行试验研究。通过圆环法试验探究混凝土强度增长与抗裂性能之间的关系,研究结果表明:(1)通过两种强度等级混凝土不同养护方式下强度增长与裂缝观测对比分析,不同养护方式对混凝土早期强度增长影响存在差异,保温保湿养护下混凝土早期强度增长最快。(2)在控制外界影响因素和混凝土外部养护条件的同时,高强度等级混凝土裂缝开裂时间和裂缝宽度均早于或大于低强度等级混凝土,混凝土强度等级越高越容易开裂。合理的养护方式对抑制和延缓混凝土裂缝的开展有重要影响,其中保温保湿养护下混凝土裂缝开裂较晚且发展缓慢。(3)裂缝的发展与混凝土早期强度增长密切相关,通过不同养护方式下混凝土强度增长与裂缝发展曲线分析,抗裂圆环裂缝的产生集中于混凝土强度增长最快的阶段,因此要重视实际工程中混凝土早期强度增长过程中的裂缝防控。In order to study the development law of concrete strength and crack resistance of concrete of different strength grades under different curing methods in desert area,C35 and C50 concrete were used in the construction site. Through the circle method test to explore the relationship between the concrete strength and crack resistance of the growth,the results show that：（ 1） Through the analysis of two kinds of strength grade of concrete under different curing method,the strength and crack growth are observed,different curing methods have different effects on the growth of early strength of concrete,the early strength of concrete under heat and wet curing has the fastest growth.（ 2） In control and external factors and concrete curing conditions of the external influence,concrete cracking time and crack width of high strength are earlier than or greater than the low strength concrete,concrete strength is more prone to cracking. The reasonable curing method has an important influence on restraining and delaying the development of concrete cracks. The cracks of concrete under heat preservation and moisture conservationare late and develop slowly.（ 3） The development of the cracks and concrete early strength growth are closely related,through the concrete strength and crack growth curve under different curing method analysis,crack ring cracks on concrete strength is the fastest growing stage,so attention should be paid to the prevention and control of cracks in actual engineering concrete early strength growth process.

关 键 词：沙漠地区 强度 抗裂性能 圆环法 

分 类 号：TU528[建筑科学—建筑技术科学]