强风干寒地区混凝土抗裂性能试验研究

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。

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

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.