混杂纤维混凝土冻融耐久性与损伤模型研究  

STUDY OF FREEZE-THAW DURABILITY AND DAMAGE MODEL OF HYBRID FIBER CONCRETE

作　　者：朱晨飞 刘晓军[1] 李文哲[1] 吴永根[1] 刘庆涛[1] 

机构地区：[1]空军工程大学航空航天工程学院,西安710038

出　　处：《工业建筑》2015年第2期10-14,共5页Industrial Construction

摘　　要：采用钢-玄武岩纤维增强混凝土的技术方法,通过冻融循环试验,研究了钢纤维与玄武岩纤维相互混杂对混凝土抗冻性的影响规律及其冻融损伤模型。研究结果表明:不同的纤维掺量对混凝土抗冻性影响较大,当钢纤维体积掺率为1.5%、玄武岩纤维体积掺率在0.05%左右时,混凝土的抗冻性最好,达到了F250以上水平;分析了混杂纤维混凝土的冻融损伤机理,分别以相对动弹性模量和冻融累积损伤为损伤变量建立了混杂纤维混凝土的冻融损伤模型,发现动弹性模量衰减模型优于冻融累积损伤衰减模型,且二次项函数模型比指数函数模型具有更高的拟合精度。Steel and basalt hybrid fibers reinforced concrete technical route was proposed, through the freeze-thaw test, the influence of steel fiber mixed basalt fiber on the frost-resistance of concrete and freeze-thaw model were studied. The results showed that different fiber dosage had great influence on the frost-resistance of concrete, and when the volume fraction of steel fiber was 1.5%and basalt fiber was 0.05%, the frost-resistance of airport pavement concrete attain the level of F250.The freeze-thaw damage mechanism was analyzed, freeze-thaw damage models of hybrid fiber concrete were established by using relative dynamic modulus of elasticity and accumulative freeze-thaw damage, the model based on relative dynamic modulus of elasticity attenuation was superior to the one based on accumulative freeze-thaw damage, and quadratic function model had a higher fit accuracy as compared to exponential function model.

关 键 词：混杂纤维混凝土 冻融循环 损伤机理 相对动弹性模量 冻融损伤度 损伤模型 

分 类 号：TU528[建筑科学—建筑技术科学]