Development of General Mix Design for Self-Placable Concrete

本研究的目的是发展一套适用于自密实混凝土的配合比设计方法。自密实混凝土可以在不使用振捣器的情况下，通过模板内的各种障碍物。应建立评价新拌混凝土填充能力的试验方法，定量地阐明填充能力与配合比及其材料性能之间的关系.填充能力试验方法的开发考虑到结构设计细节和实际现场的浇筑方法，开发了评估新拌混凝土填充能力的试验方法。为了评估灌装能力，。应进行变形性的坍流试验、V形隧洞流速试验和通过小间距钢筋的流动性试验.混凝土填充能力预测模型考虑了障碍物周围集料堵塞的概率和在特定压力条件下通过小间距的变形极限，提出了填充能力预测模型。该模型成功地验证了通过进行开发的测试填充能力.自密实混凝土材料与配合比设计系统研究了自密实混凝土材料填充性能的评价方法，提出了满足自密实混凝土填充性能要求的材料与配合比设计系统，并考虑了混凝土硬化后的耐久性。

The objective 'of this study is to develop the general mix design method for self-placable concrete, which can flow through the various obstructions in the formwork without using any vibrators. The test method for evaluating the filling capacity of fresh concrete should be established and the relation between the filling capacity and mix proportions and its material properties should be clarified quantitatively.1. Development of test method for filling capacityThe test method for evaluating filling capacity of fresh concrete was developed, considering the structural design details and placing method at the actual site. For evaluating the filling capacity, . slump-flow test for deformability, flow-speed test using the V-tunnel and flowability test through small spacings between reinforcing bars should be carried out.2. Model of prediction for filling capacity of concretePrediction model for filling capacity was proposed considering the probability of blocking of aggregates around the obstructions and the limit of deformability through the small spacings under the specified pressure condition. The model was successfully verified by conducting the developed test for fiiling capacity.3. Material and mix design system for self-placable concreteEvaluation method of inaterial properties for fiiling capacity was developed and material and mix design system for self-placable concrete having the required filling capacity was proposed, considering the durability of concrete after being hardened.