摘要
为了得到能够满足工程要求的C80、C100高强混凝土收缩与徐变预测计算模型,分别对C80、C100高强混凝土进行标准条件下150 d徐变和28 d的收缩试验,然后分别采取CEB-FIP(1990)模型、B3模型、GL 2000模型计算收缩和徐变值。通过相对误差分析发现,只有B3模型相对较好,据此进行了模型修正。结果表明,高强混凝土徐变系数随龄期增长而变大,但后期的变化率逐渐减小并趋于平缓(120 d后);而收缩变形则主要发生在早期(3 d内),最高可达28 d收缩量的79%,14 d后就发展较慢,但较普通高强混凝土(未掺矿物掺和料)低些;B3修正模型的相对误差绝对值基本在10%左右,因此可以满足工程要求。
In order to obtain C80, C100 high-strength concrete shrinkage and creep prediction models that meet project requirements, the 150 d creep and 28 d shrinkage tests were carried out under standard test conditions for C80 and C100 high-strength concrete respectively, then the theoretical shrinkage and creep values were calculated by CEB-FIP (1990 ) model, B3 model and GL 2000 model respectively.The best model was B3 model by relative error analysis, so the model was accordingly amended.The results showed that the creep coefficients of high-strength concrete increased with age and became larger, but gradually decreased in the later and the rate of change level off (120 d later);while the shrinkage mainly occurred in the early 3 d, the amount of shrinkage was up to 79% by 28 d, but the development was slower after 14 d, and lower than normal strength concrete ( with out mineral admixtures);the absolute values of relative errors were about 10% or so calculated by amended B3 model, which could meet the engineering requirements.
出处
《工业建筑》
CSCD
北大核心
2015年第3期120-125,共6页
Industrial Construction
基金
国家自然科学基金项目(41172317)
深部矿井建设省重点学科开放实验室开放基金(2011KF-01)
河南省教育厅科技攻关项目(2010A560010)
关键词
高强混凝土
收缩
徐变
模型预测
修正系数
high-strength concrete
shrinkage
creep
model prediction
correction factor
