荷载作用下混凝土的碳化深度

Study on Carbonation of Concrete under Loading

通过养护28 d和90 d混凝土的快速碳化实验,研究了未加载混凝土的碳化经时模型;在不同荷载率(25%和50%)下和不同养护龄期时研究了混凝土的抗碳化能力.结果显示:未加载混凝土的碳化经时模型符合指数关系;施加荷载后混凝土的抗碳化能力显著劣化,而延长养护龄期可提高混凝土的抗碳化能力.

Based on accelerated carbonation test of concrete with curing age of 28 d and 90 d, the model of carbonation durability failing with time (CDFT) was studied. Effects of different loading rate and curing age on carbonation resistance of concrete were also studied. The results show that the CDFT of HPC can regress to D=atb, and loading lowers the carbonation resistance of concrete, the carbonation depth increases by 22.2%-100.0%, and the relation of carbonation depth and loading rate can regress to Dσ=D0 (l+k(Sσ)m). Moreover, the longer the curing age, the higher the carbonation resistance of concrete.