Nano-TiO2 was mixed into concrete with the same quality instead of cement(0,1％,3％,5％).The compressive test and carbonation test of nano-TiO2 concrete were carried out.The effect of nano-TiO2 content on the compressive strength and carbonation depth of concrete was studied.The carbonation depth model of concrete considering nano-TiO2 content and carbonation age was established.The results show that the addition of appropriate amount of nano-TiO2 has a good promotion effect on the improvement of compressive strength and carbonization performance of concrete,and with the increase of nano-TiO2 content,the promotion effect on the two increases first and then decreases.When the content of nano-TiO2 is 1％,the performance of concrete is the best.The carbonation depth model was improved by introducing the influence coefficient of nano-TiO2 on the carbonation depth of concrete.The model prediction data are in good agreement with the experimental data,which can be applied to the prediction of carbonation depth of nano-TiO2 concrete.
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