纳米TiO_(2)对再生混凝土抗碳化性能的影响  

Influence of nano-TiO_(2)on anti-carbonation performance of recycled aggregate concrete

作　　者：钟楚珩 龙宇华 周金枝 田鹏 ZHONG Chuheng;LONG Yuhua;ZHOU Jinzhi;TIAN Peng(School of Civil Engineering,Architecture and Environment,Hubei University of Technology,Wuhan 430070,China;State Key Laboratory for Health and Safety of Bridge Structures(China Railway Major Bridge Engineering Group Co.,Ltd.),Wuhan 430034,China)

机构地区：[1]湖北工业大学土木建筑与环境学院,武汉430070 [2]桥梁结构健康与安全国家重点实验室(中铁大桥局集团有限公司),武汉430034

出　　处：《中国科技论文》2022年第12期1369-1375,共7页China Sciencepaper

基　　金：国家自然科学基金资助项目(52208340);桥梁结构健康与安全国家重点实验室开放课题资助项目(BHSKL19-04-KF);湖北工业大学博士科研启动基金资助项目(BSQD2020051)。

摘　　要：为了研究纳米TiO_(2)掺量(0、0.4%、0.8%、1.2%)和再生粗骨料取代率(25%、50%、75%)对再生混凝土抗碳化性能的影响,对各组再生混凝土试件进行了快速碳化试验,测得了再生混凝土在不同碳化龄期(3、7、14、28 d)的碳化深度,并对不同纳米TiO_(2)掺量和再生粗骨料取代率下的再生混凝土碳化深度进行了计算与分析。结果表明:再生混凝土碳化深度随碳化时间和再生粗骨料取代率的增大而增大;纳米TiO_(2)的掺入能有效提高再生混凝土的抗碳化性能,且不同再生粗骨料取代率下,纳米TiO_(2)的最优掺量均为0.8%。对试验所得数据进行回归分析,建立了纳米TiO_(2)再生混凝土碳化深度预测模型。对实测值与模型计算值进行了误差分析,可知该模型能较好地预测纳米TiO_(2)再生混凝土的碳化深度。In order to study the influence of nano-TiO_(2)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-TiO_(2)contents and RCA replacement ratios 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-TiO_(2)can effectively improve the anti-carbonation performance of RAC,and the optimal nano-TiO_(2)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 well predict the carbonation depth of NT/RAC.

关 键 词：纳米TiO_(2) 再生混凝土 碳化深度 碳化模型 误差分析 

分 类 号：TU528[建筑科学—建筑技术科学]