A study on concrete practice design method depend on time-depending-change of property for fresh concrete

为了开发一种具体的实用设计方法，我们必须使流动性随着时间的推移和压力的变化而明显地变化，并且必须开发一种紧实性的评估方法。本研究进行了以下四个系列的试验研究：1.新拌砂浆组成材料流变常数预测方法的研究：1.新拌砂浆塑性粘度的预测方法研究：1.新拌砂浆的塑性粘度可用过量糊化理论进行预测；2.流动性随时间变化的机理研究及预测方法的建立参考Hattori-Izumi理论建立了聚羧酸系高效减水剂新拌砂浆粘度变化的预测方法。3.新拌砂浆受压流动性预测方法的研究.在本研究中，我们参考应力依赖速率过程理论，通过加入势能折减量，可以预测新拌砂浆在压力下的粘度变化.4.新拌混凝土密实度的评价研究本研究表明，在恒定流动情况下，可以利用V型漏斗试验结果与可视化最大剪切应变率之间的关系来评价新拌混凝土的密实度.

In order to develop a concrete practice design method, we must make flowability change as time goes by and under pressure obvious and must develop an evaluating method of compactability. In this study, 4 experimental series were carried out following ;1.A study on prediction method of rheological constants for fresh mortar from constituent materials It is appeared that plastic viscosity of fresh mortar might be predicted by applying excess paste theory.2.A study on a mechanism of time-dependent-change of flowability and establishing a prediction method A prediction method of the change in viscosity for fresh mortar used polycarboxylate based superplasticizer was established referencing Hattori-Izumi theory. And it was shown that the change of viscosity for fresh mortar might be predicted by applying excess paste theory.3.A study on a prediction method of flowability for fresh mortar under pressure.In this study, we showed that the change of viscosity for fresh mortar under pressure mighit be predicted by adding potential energy reduction referencing stress-depending rate process theory.4.A study on evaluation of compactability for fresh concreteIn this study, it was appeared that the compactability for fresh concrete flowing in a form might be evaluated by using relationship between V type funnel test result and maximum shear strain rate from visualization technique in case of steady flow.