高温后再生混凝土的变形性能试验  

Experimental on deformation of recycled concrete after high temperature

作　　者：万夫雄[1] 赵鹏辉[1] 柴栋[1] 余绍绅 杨雪[1] 

机构地区：[1]昆明理工大学建工学院,云南昆明650000

出　　处：《混凝土》2016年第11期4-6,11,共4页Concrete

基　　金：国家自然科学基金(50678050)

摘　　要：再生混凝土高温性能直接影响到再生混凝土结构的火灾安全。进行了粗骨料替代率分别为0、25%、50%、75%、100%的再生混凝土棱柱体(100 mm×100 mm×300 mm)在经历常温,150、300、450、600、750℃各温度后的单轴受压变形性能试验,获得了不同粗骨料取代率再生混凝土经历不同高温后完整的应力应变曲线,得到了高温后弹性模量和峰值应变。试验表明,在同一再生粗骨料取代率下,随着经历的温度升高,再生混凝土单轴受压应力应变曲线上升段与下降段越来越平缓,其弹性模量逐渐降低,峰值应变逐渐增大,其变化幅度随温度大小不同有所变化。高温后再生混凝土弹性模量和峰值应变随着再生粗骨料取代率的变化并不呈现单一的变化规律,而是随温度大小而不同。Performance of recycled concrete （RC） experienced high temperature has effect on fire safety of RC structure.Experiment of deformation performance was conducted on prism specimens （ 100mm× 100mm×300mm） with different recycled coarse replacement rate of 0,25%, 50%, 75% and 100% after being exposed different temperature of room temperature, 150,300,450,600 and 750 ℃ .The uniaxial compressive stress-strain curve was recorded, and elastic modulus and peak strain was obtained.The test results show that：after the differ- ent temperature, ascending and descending part of stress-strain curve become more gentle,the elastic modulus of RC become more lower, the peak strain become more larger with the increase of temperature, but their change range varies with temperature.After the same temper- ature ,the peak strain and the elastic modulus do not change as a single law with different recycled coarse aggregate replacement rate,and its change law is related to temperature.

关 键 词：再生混凝土 高温 应力应变曲线 弹性模量 峰值应变 

分 类 号：TU528.01[建筑科学—建筑技术科学]