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Numerical and experimental study of creep and shrinkage in a high-performance concrete

机译:高性能混凝土中蠕变和收缩的数值和实验研究

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In this study, an experimental investigation on a high-performance concrete used for the construction of a pre-stressed bridge is presented, together with the numerical assessments of the material properties, such as strength, modulus of elasticity, creep, and shrinkage. In this experimental investigation cylindrical specimens were used to measure shrinkage strains under both sealed and drying conditions, with environmental relative humidity of 50% and temperature of 20°C. In addition, basic and drying creep tests were also conducted under the same aforementioned environmental conditions starting at the age of 2 and 28 days. The rate-type creep model, entitled solidification-microprestress-microplane (SMM) model (Di Luzio and Cusatis, 2013), which amalgamates a microplane model and the solidification-microprestress theory is adopted to simulate the age-dependent response of sealed and unsealed specimens observed in the experimental investigation previously mentioned. Comparison with experimental data shows that the SMM model can explain well the interplay of shrinkage (autogenous and drying), creep, and cracking phenomena.
机译:在这项研究中,对用于预应力桥梁的高性能混凝土进行了实验研究,并对材料特性(例如强度,弹性模量,蠕变和收缩)进行了数值评估。在此实验研究中,使用圆柱状样品在密封和干燥条件下测量收缩应变,环境相对湿度为50%,温度为20°C。此外,还从2天和28天开始,在相同的上述环境条件下进行了基本蠕变试验和干燥蠕变试验。速率型蠕变模型,称为凝固-微预应力-微平面(SMM)模型(Di Luzio和Cusatis,2013),将微平面模型合并,并采用凝固-微预应力理论模拟密封和未密封的随年龄变化的响应在前面提到的实验研究中观察到的标本。与实验数据的比较表明,SMM模型可以很好地解释收缩(自生和干燥),蠕变和开裂现象之间的相互作用。

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