应力-化学介质-冻融循环协同作用下水泥基材料失效机理及寿命预测的研究  

Research on Failure Mechanism and Service Life Prediction of High Performance Cementitious Materials under the Synergistic Effect of Stress,Chemical Medium and Freezing-Thawing Cycle

作　　者：王玲[1] 吴浩[1] 管学茂[1] 黄鹏飞[1] 

机构地区：[1]中国建筑材料科学研究总院绿色建筑材料国家重点实验室,北京100024

出　　处：《中国材料进展》2010年第9期25-33,共9页Materials China

基　　金：973项目"高性能水泥制备和应用的基础研究"(2001CB610706);"水泥低能耗制备与高效应用的基础研究"(2009CB623100)

摘　　要：针对水泥基材料在应力-化学介质-冻融循环协同作用下的耐久性进行了研究,并开发了多种材料失效试验方法和装置。砂浆试件应力-化学腐蚀协同作用试验装置的特点是加载稳定,克服了应力松弛;协同作用耐久性试验装置可以用于监测协同作用下钢筋混凝土试件性能的衰减过程。研究发现:矿物掺合料改善抗渗性的能力依次是矿渣粉、活化煤矸石粉、粉煤灰;随应力比加大和冻融循环次数增加,水泥基材料中钢筋锈蚀加速、化学介质的渗透速度和深度增大,协同作用加速了水泥基材料的失效;可以用一元二次函数来近似预测氯盐-冻融循环-弯曲荷载协同耦合作用下的寿命。Research on the durability of cementitious materials under the synergistic effect of stress,chemical corrosion and freezing-thawing cycle was systematically conducted.The strongpoint of equipments for mortar and concrete research under synergistic effect is stable load,non-stress relaxation and performance on-line monitoring.For the improvement on permeability,blast furnance slag was ranked most,followed by activated coal gangue and fly ash.Along with the increase of stress ratio and freezing-thawing cycle,performance failure was expedited because of the acceleration of steel bar corrosion and the penetration degree of chemical medium.A quadratic function was established to estimate concrete service-life under synergistic effect of chloride ion,freezing-thawing cycle and bending load.

关 键 词：失效机理 寿命预测 化学介质 水泥基材料 冻融循环 

分 类 号：TU528[建筑科学—建筑技术科学]