Establishment of Analysis Method and Evaluation Test of Fresh Concrete.

本文的研究结果总结如下：1。为明确其压力特性、剪切应变特性和性能转变，进行了剪切试验和改进的剪切箱试验。根据实验结果，阐明了其压力依赖特性、剪切应变依赖特性和过渡特性，并建立了模型。骨料和粉料性能对稠度的影响为了弄清骨料和粉料性能对新拌混凝土或砂浆稠度的影响，进行了一些试验研究。试验结果表明，初拌混凝土和砂浆的稠度受基质膏体稠度的影响大于细粒料和粗粒料相互接触的影响，用球形粉煤灰替代降低了屈服值。为了弄清剪切箱中材料内部应力的分布，采用粘塑性有限元法和粘塑性悬浮单元法对剪切箱试验进行了模拟。根据Bingham模型的模拟结果，给出了剪切应变依赖特性。进一步阐明了由于铰壁之间的距离大大减小，铰壁之间的材料在大剪切应变下被压缩。

The results obtained in this research are summarized as follows :1.Pressure Dependent Property, Shear Strain Dependent Property and Transition of PropertyIn order to clarify the pressure dependent property, the shear strain dependent property and the transition of property, the shear test and the improved shear box test were carried out. According to the experimental results, the pressure dependent property, the shear strain dependent property and the transition of property are clarified and modeled.2.Influence of Properties of Aggregate and Powder on ConsistencyIn order to clarify the influence of properties of aggregate and powder on consistency of fresh concrete or mortar, some experimental investigations were carried out. According to the experimental results, it is clarified that the consistency of fresh concrete and mortar is more influenced by consistency of matrix paste than the touch of fine and course aggregates with each other, and the replacement with sphere shaped fly ash decreases the yield value.3.Simulation of Shear Box TestIn order to clarify the internal distribution of stress in material in shearing box, the shear box test was simulated by viscoplastic finite element method and viscoplastic suspension element method. According to the simulational results with Bingham model, the shear strain dependent property was represented. Furthermore, it is clarified that the material between hinged walls are compressed under large shear strain because the distance between walls are extremely decreased.