Study on Construction Designing Method for Fresh Concrete

点击翻译按钮获取中文摘要

The results obtained in this research are summarized as follows :1. The flow simulations of fresh concrete in various consistency tests were carried out with three developed simulation methods, such as viscoplastic finite element method, viscoplastic suspension element method and viscoplastic divided space element method.2. In order to clarify the influence of vibration and size of material, the experiments with saturated sand, mortar and model concrete were carried out. And the experimental propagation of vibration was simulated with viscoplastic finite element method and discussed.3. The parameters in the constitutive law of fresh mortar and concrete were quantified as a homogeneous material by shear box test. And flow simulations were carried out by viscoplastic finite element method with Bingham's model, validated for wet mixed concrete, or shear strain dependent viscoplastic model, proposed from the experiments, and the adequacies of these models were discussed.4. In order to discuss the segregation resistivity from the rheological view point, the pressing down experiment with sieve bottom vessel was carried out. Furthermore, the segregation resistivity test was simulated by two dimensional viscoplastic suspension element method with virtual radius of coarse aggregate.5. In order to clarify the flow mechanism of fresh concrete passing through steel bars, the passability tests with various arrangement of steel bars were simulated by two dimensional viscoplastic suspension element method considering the rotational motion of aggregates.