纳米TiO2对再生混凝土抗碳化性能的影响

In order to study the influence of nano-TiO2 content (0, 0.4%, 0.8%, 1.2%) and recycled coarse aggregate (RCA) replacement ratio (25%, 50%, 75%) on the anti-carbonation performance of recycled aggregate concrete (RAC), the rapid carbonation test was carried out. The carbonation depth of RAC at different carbonation ages (3 d, 7 d, 14 d, 28 d) was measured, and the effects of different nano-TiO2 content and RCA replacement ratio were analyzed. The test results show that the carbonation depth of RAC increases with the increase of carbonation time and the replacement ratio of RCA. The incorporation of nano-TiO2 can effectively improve the anti-carbonation performance of RAC, The incorporation of nano-TiO2 can effectively improve the carbonation resistance of recycled concrete, and the optimal nano-TiO2 content is 0.8% regardless of the replacement ratio of RCA. Regression analysis was carried out on the data obtained from the test, and the carbonation depth prediction model of NT/RAC was established. Through the error analysis between the measured value and the calculated value of the prediction model, it can be seen that the model can better predict the carbonation depth of NT/RAC.