STRESS-CARBONATION OF FLY ASH CONCRETE
In this paper, a preloading frame is firstly designed to accurately apply external flexural stressto concrete specimens. Then a method that is used to measure one and two dimensional (1D and2D) carbonation depth of concrete under flexural stress is developed. Using this method andpreloading frame, I D and 2D stress-carbonation depth at different carbonation ages issystematically investigated for fly ash concretes made with different fly ash content (0％, 10％,20％, 40％, 60％), types of fly ash (grade 1, grade II), water to binder ratios (0.3, 0.35, 0.4),amount of binders (458kg/m3, 380kg/m3), curing ages (28d, 90d). The stress accelerating effecton 1D and 2D carbonation is also quantitatively analyzed through a comparison between stresscarbonation and non-stress carbonation. Finally, the process of the initiation, prorogation anddistribution of microcracks on the tensile face of specimen is in-situ observed by usingsmall-sized loading frame and Scanning Electron Microscope (SEM). The above researchprovide an insight into carbonation attack on the edge reinforcing bars of concrete structuresunder flexural stress, such as large-span beam and board in the field of civil engineering.
Yunsheng Zhang Wei Sun Shudong Chen Fei Guo
Jiangsu Key Laboratory of Construction Materials,Southeast University,Nanjing,211189,P.R.China
国际会议
南京
英文
583-592
2008-10-13（万方平台首次上网日期，不代表论文的发表时间）