Development of Evaluation System for Self-Compactability of Fresh Concrete

本研究的目的是建立评价任意材料、任意配合比的新拌混凝土自密实性的试验方法，并建立自密实混凝土在配合比、制造控制和现场检验过程中的评价体系。提出了评价自密实性的原型试验方法。它是基于试验结果与结构实际施工结果之间的关系。为了使混凝土的性能向目标调整，在自密实性不足的情况下，开发了新拌混凝土的变形性、抗离析性和过障性评价体系。提出了流动混凝土的数学模拟方法，可以实现未来无需测试的配合比设计系统和施工设计。提出了从自密实性角度评价材料性能的方法，以使配合比设计合理化。这些对混凝土厂的制造控制也很有用。利用混合机在混合过程中消耗的能量，提出了混合控制系统。提出了在施工现场进行自密实性检验的验收试验方法。它是在浇筑前对所有混凝土进行连续测试。所提出的评价体系应在实际建设中通过收集数据和信息，在每个过程中进行验证，并在未来进行修改。

The objective of this research is to develop the test method for evaluating the self-compactability of fresh concrete which has arbitary materials and mix proportions and to establish the evaluation system for self-compacting concrete in the process of mix proportioning, manufacturing control and examination at the site.The proto-type test method for evaluating the self-compactability is proposed. It is based on the relationship between the test results and results in the actual construction of structures.For adjusting the properties of concrete to the target, when having the insufficient self compactability, the evaluation system is developed for deformability, segregation resistance and passability through obstacles of fresh concrete. Mathematical simulation methods for flowing concrete are proposed, which can realize the mix design system and construction design without testing in the future.The evaluation methods for material properties in the view point of self-compactability are proposed for the rationalization of mix design. These are also useful for manufacturing control in the concrete plants. The mixing control system is also proposed by using the consumed energy of mixer during mixing.The acceptance test is proposed for examining the self-compactability at the construction site. It is a continuous test of all concrete just before casting. The proposed evaluation system should be verified in each process by collecting data and information in the actual construction and will be modified in the future.