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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:在该研究中,提出了对用于构建预应力桥的高性能混凝土的实验研究,以及材料性质的数值评估,例如强度,弹性模量,蠕变和收缩。在该实验研究中,用于测量密封和干燥条件下的收缩菌株,环境相对湿度为50%,温度为20℃。此外,还在2和28天开始的相同的环境条件下进行碱性和干燥蠕变试验。采用合并微板模型和凝固 - 微管型和凝固 - 微扶任材料的速率型蠕变模型(DI Luzio和Cusatis,2013)的速率型蠕变模型(DI Luzio和Cusatis,2013)模拟了密封和未密封的年龄依赖性响应在先前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模型可以良好地解释收缩(自生干燥),蠕变和开裂现象的相互作用。

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