强风干寒地区混凝土抗裂性能试验研究  

Experimental Study on Cracking Resistance of Concrete in Dry and Cold Regions with Strong Wind

作　　者：康健[1] 刘建勋[2] 张戎令[1,2] 赵文斌[1] 赵永鹏 KANG Jian;LIU Jian-xun;ZHANG Rong-ling;ZHAO Wen-bin;ZHAO Yong-peng(Key Laboratory of Road ＆ Bridge and Underground Engineering of Gansu Province,Lanzhou Jiaotong University,Lanzhou 730070,China;National and Provincial Joint Engineering Laboratory- of Road ＆ Bridge Disaster Prevention and Control,Lanzhou Jiaotong University,Lanzhou 730070,China;Gansu Road and Bridge Construction Group Co.,Ltd.,Lanzhou 730070,China)

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]兰州交通大学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：《长江科学院院报》2018年第8期122-127,共6页Journal of Changjiang River Scientific Research Institute

基　　金：青年人才托举工程项目(2015QNRC001);长江学者和创新团队发展计划滚动支持项目(IRT_15R29);兰州交通大学优秀平台资助项目(201606)

摘　　要：为研究强风干寒地区混凝土的抗裂性能,在控制环境因素及外部养护条件下,采用C35和C50等级混凝土抗裂圆环和实体混凝土桥墩进行现场试验研究。通过对2种等级混凝土裂缝开裂时间及宽度的对比分析,结果表明:混凝土强度等级越高,混凝土越容易开裂;养护方式影响混凝土的抗裂性能,同种等级混凝土采用的不同养护方式中保温保湿养护防止混凝土开裂效果最佳;不同等级混凝土采用同种养护方式时,强度等级高的混凝土易产生裂缝,因此低等级混凝土养护方式不一定适用于高等级混凝土,对于高性能的混凝土更应该加强养护优化养护措施。研究结果可供类似工程中混凝土抗裂性能试验参考。To investigate the anti-cracking performance of concrete in dry and cold region with strong wind,we performed in-situ tests on C35 and C50 concrete anti-cracking rings and concrete bridge piers by changing environmental and external curing conditions. By comparing the cracking age and cracking width of the two strength-levels of concrete,we found that 1） concrete of larger strength level is more susceptible to cracking; 2） among different curing methods,maintaining heat and humidity has the optimum effect in preventing cracking for concretes of the same strength level; 3） while for concretes of different strength levels cured by the same measure,high-strength concrete is prone to cracking. Therefore,curing methods for low-strength grade concrete may not be suitable for high grade concrete which requires optimized measures.

关 键 词：混凝土 强风干寒地区 强度等级 抗裂性能 保温保湿养护 

分 类 号：TU502.4[建筑科学—建筑技术科学]