温度对C40高性能混凝土断裂能的影响  

Effect of temperature on fracture energy of C40 high performance concrete

作　　者：闫昕[1] 杜红秀[1] 金鑫[1] 

机构地区：[1]太原理工大学建筑与土木工程学院,山西太原030024

出　　处：《混凝土》2016年第6期12-14,共3页Concrete

基　　金：国家自然科学基金资助项目(51278325)

摘　　要：为研究C40高性能混凝土高温后裂缝扩展所需能量,对高性能混凝土模拟高温试验,在设定不同温度等级及恒温时间作后,利用电液伺服万能试验机对试件施加荷载产生裂缝,绘制荷载-跨中位移曲线图,计算断裂能及其百分率。结果表明:在恒温2、3 h和烧透三个系列情况下,C40高性能混凝土的断裂能值在300℃时达到最大,裂缝扩展所需能量较多。之后随着温度的升高测定的断裂能越来越低。与常温相比,300℃以上的高温情况更容易造成混凝土的断裂。To analysis the propagation energy of C40 HPC per unit area after high temperature, the high performance concrete （HPC） were burned thoroughly at different temperatures, using the electro-hydraulic servo universal testing machine to test the application of force generated cracks, draw load-displacement curve, to calculate the fracture energy and the relative percentage of fracture.The results show that the fracture energy of C40 HPC reached the maximum value at 300 ℃, which need more crack extension energy.The fracture energy of concrete decreased with the increase of temperature.Compared with normal temperature,high temperature above 300 ℃ degrees may cause more concrete crack.

关 键 词：高性能混凝土 高温 断裂能 

分 类 号：TU528.01[建筑科学—建筑技术科学]