RESEARCH ON 1 DIMENSION AND 2 DIMENSION CARBONATION OF FLY ASH CONCRETE UNDER LOADING

The 1D and 2D carbonations of high performance concrete are studied under different fly ash proportion(0%, 20%, 40%, 60%) and different ratio of bending load(0.20, 0.35, 0.50, 0.65, 0.80).The test method of 2D carbonation under loading is built;The interaction coefficient of 2D carbonation is defined.The influence of different bending load ratio on interaction coefficient is studied.The experiment indicates that carbonation depth of 1D and 2D are increased with the raising ratio of bending load.During the carbonation of 28 d(corresponding to nature carbonation of 50 years), the 1D and 2D carbonation depth under 0.8 ratio of bending load are 1.61 times and 1.39 times as compared to 0 ratio of bending load.At the same time, the depths of carbonation subject to the exponential function of bending load ratio.The 2D carbonation of concrete has an obvious interaction coefficient.The 2D interaction coefficient with load is much smaller than the interaction coefficient without load.And with the increase of stress ratio, the value of interaction coefficient trends to decrease.The research on the 1D and 2D carbonations of concrete under bending load possesses the real meaning to the structure durability and life prediction of concrete.