摘要
结合西北地区大断面城市隧道混凝土结构所使用的材料配合比进行配制试块,通过对3种不同混凝土进行冻融循环试验(0,50次,150次)和加速碳化试验(0,1周,2周),研究两者对混凝土的耦合作用.试验结果表明,冻融破坏是混凝土碳化腐蚀的催化剂,能够加速混凝土的碳化进程;碳化反应在早期虽在一定程度上能够提高混凝土抗压强度,但是150次冻融循环且碳化2周后,较大水灰比的混凝土强度由200MPa降为98MPa;经过冻融、碳化耦合作用后,混凝土的劈裂强度比抗压强度低很多.
Blocks were made on the basis of the material and its mix proportion used in the large section city tunnels in Northwest China and the freezing-thawing cycle test （0,50 times, 150 times） and the accel- erated carbonization test （0,1week,2 weeks） were conducted on the three kinds of concrete to research the coupling effects of the tests on concrete. The results show that the freezing and thawing damage is the cata- lyst in the carbonization corrosion of concrete, which accelerates the carbonization of concrete. The strength of high water cement ratio concrete,after the 150-time freezing-thawing cycle and two-week carbonization reduced from 200 MPa to 98 MPa,and cleavage strength of concrete after coupling effect of thawing,car- bonization is much lower than compressive strength.
出处
《甘肃科学学报》
2014年第1期134-138,共5页
Journal of Gansu Sciences
关键词
冻融循环
碳化反应
耦合作用
碳化深度
抗压强度
Freezing-thawing cycle
Carbonization
Coupling effect
Carbonization depth
Compressivestrength
