早龄期高强混凝土拉伸徐变特性  

TENSILE CREEP BEHAVIOR OF HIGH STRENGTH CONCRETE AT EARLY AGES

作　　者：杨杨[1] 许四法[1] 叶德艳[1] 王章夫 

机构地区：[1]浙江工业大学建筑工程学院,杭州310014 [2]浙江华威建材集团有限公司,杭州310018

出　　处：《硅酸盐学报》2009年第7期1124-1129,共6页Journal of The Chinese Ceramic Society

基　　金：浙江省自然科学基金(Y106856)资助项目

摘　　要：通过早龄期混凝土拉伸基本徐变的实验,研究了不同水灰比、加载龄期、加载初始应力强度比(应力水平)等参数条件下的早龄期高强混凝土拉伸徐变特性。结果表明:龄期0.5,0.75d和1d加载的混凝土表现出较大的徐变变形,并且徐变速度在持续加载一段时间后随龄期的推迟而急速下降;龄期0.5,0.75d加载的混凝土徐变表现出较大的非线性,同一加载龄期下,加载初始应力强度比越大,比徐变越大,加载初期的徐变速度越快;但加载龄期在1,3,7d的混凝土徐变仍表现出较明显的线性特征。同一加载龄期、同一加载应力强度比的条件下,水灰比越大,比徐变越大,而且加载龄期越早,比徐变的差异越明显。The effects of water-cement ratio, loading age and stress-strength ratio （stress level） on the behavior of the tensile basic creep of high strength concrete at early ages were investigated experimentally. The results show that the tensile creep stain develope very quickly when concrete is loaded at 0.5, 0.75 and 1 d, and the creep rate decrease rapidly after a short initial time under loading. The tensile creep is not proportional to applied stress when the loading age is 0.5 or 0.75 d, and the higher the initial stress-strength ratio, the larger the specific creep strain and creep rate. However, it exhibits linear behavior when the loading ages are 1, 3 and 7 d. For a given loading age and initial stress-strength ratio of applied load, the higher the water-cement ratio, the larger the specific creep. The difference in the specific creep is more significant when the load is applied earlier.

关 键 词：拉伸基本徐变 高强混凝土 加载龄期 应力强度比 早龄期 

分 类 号：O482.3[理学—固体物理]