高性能混凝土在约束条件下的受拉徐变特征  

Tensile Creep of High Performance Concrete Under Restrained Condition

作　　者：马新伟[1] 钮长仁[1] HOOTON R D 

机构地区：[1]哈尔滨工业大学材料科学与工程学院,哈尔滨150006 [2]多伦多大学土木系

出　　处：《武汉理工大学学报》2006年第2期26-29,41,共5页Journal of Wuhan University of Technology

摘　　要：介绍了一套对混凝土施加约束的试验方法,研究了在约束条件下的内应力发展规律以及在此拉应力作用下的早期徐变特征。详细论述了混凝土在约束条件下对自生拉应力、弹性应变和徐变进行量化的数学方法,为深入研究高性能混凝土在早龄期的粘弹性能开辟了一个行之有效的途径。结果表明,混凝土早期表现出较强的徐变能力,其徐变系数随龄期近似呈指数函数衰减。混凝土开裂与否不仅取决于收缩,很大程度上受拉徐变的影响。A testing method to exert restraint to a concrete specimen was introduced, The internal stresses and early-age tensile creep could be investigated. Mathematically, the quantification of self-indueed tensile stress, elastic strain, and tensile creep was described. Therefore, an effective way to study the early-age viscoelastic behaviors was developed. The results indicated the concrete exhibited a considerable tensile creep; creep coefficient declined in an exponential function. Concrete cracks or not relied not only on shrinkage, but also the tensile creep to a considerable extent.

关 键 词：早龄期 约束收缩 拉应力 弹性应变 徐变 

分 类 号：TU528.31[建筑科学—建筑技术科学]