重庆大学学报2016，Vol.39Issue(2)：131-139,9.DOI:10.11835/j.issn.1000-582X.2016.02.017
冻融损伤对再生混凝土耐久性及与钢筋粘结性能分析
Effect of the freeze-thaw damage on the durability of recycled concrete and the bonding performance of steel
摘要
Abstract
Four groups of concrete test-pieces were made.The first two group test-pieces,RC1 and RC2, were made from recycled 100% coarse aggregate concrete with and without air-entraining agent respectively.The second two group test-pieces,NC1 and NC2,were made from common concrete with and without air-entraining agent respectively.Then,we studied the compressive strength,the mass loss rate and the dynamic elastic modulus loss rate of the test-pieces after different times of freeze-thaw cycles.It is shown that the compressive strength,the mass loss rate and the dynamic elastic modulus loss rate of all groups reduce after freeze-thaw.While these parameters of NC1 and RC1 which contain air-entraining agent decrease less.After 200 times of freeze-thaw cycles,the loss of the compressive strength of RC1 is close to 40%,the mass loss rate is 0.5%,and the loss rate of the dynamic elastic modulus is 38.5%.Another group of test-pieces,ZRC,which has the same components as RC1 ,were used for center drawing tests.And it’s found that there are two forms of damage,splitting failure and steel pull-out damage,after freeze-thaw cycles.The ultimate bond stress between recycled coarse aggregate concrete and reinforcing bar reduces as the times of freeze-thaw cycles increase.After 200 times of freeze-thaw cycles,the ultimate bond stress reduced 33.5%.There is a rising section and a descending section in the load-slip curve.关键词
再生混凝土/冻融循环/粘结/滑移Key words
recycled concrete/freeze-thaw cycle/bond/slip分类
建筑与水利引用本文复制引用
王晨霞,钤建勋,王浩,徐阔,曹芙波..冻融损伤对再生混凝土耐久性及与钢筋粘结性能分析[J].重庆大学学报,2016,39(2):131-139,9.基金项目
内蒙古自然科学基金（2014MS0551，2015MS0552）；内蒙古自治区高等学校科学研究项目（NJZY159）；包头市科技计划项目（2014X1009）。Supported by Inner Mongolia Natural Science Foundation of China（2014MS0551，2015MS0552），the Inner Mongolia Autonomous Region of Institutions of Higher Learning Scientific Research Project（NJZY159）and Baotou Science and Technology Plan Projects（2014X1009）． （）
