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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 get the calculation model of shrinkage and creep prediction of C80 and C100 high-strength concrete that can meet the engineering requirements, C80 and C100 high-strength concrete were subjected to 150-day creep and 28-day shrinkage tests under standard conditions respectively. Then CEB-FIP ) Model, B3 model, GL 2000 model to calculate shrinkage and creep values. By relative error analysis, it is found that only the B3 model is relatively good, and the model correction is carried out accordingly. The results show that the creep coefficient of high-strength concrete increases with age, but the rate of change decreases gradually and tends to be gentle (after 120 days); while shrinkage deformation occurs mainly in the early stage (within 3 days) Up to 79% of 28 days shrinkage, and developed slowly after 14 days, but lower than ordinary high-strength concrete (non-mineral admixture). The absolute value of relative error of B3 correction model was about 10% Engineering requirements.