Synthetic Study on Self-Placeable Concrete

为开发可自置混凝土，建立可自置混凝土的生产和施工体系，进行了试验和分析研究。通过本研究，得到以下结果：1。胶凝材料的发展提出了胶凝材料质量的测试方法。利用这些方法对多种粉体材料进行了评价。结果表明，中热水泥适合作为自浇筑混凝土的标准粉料。另一方面，指出混凝土的变形性能取决于水泥与高效增塑剂的组合。建立了混凝土材料设计系统。该系统由配合比设计系统和耐久性校核系统组成。在对搅拌机理进行研究的基础上，建立了两步搅拌混凝土填充能力控制系统。在上搅拌器中，利用搅拌器的转矩调节砂的表面水量。在下搅拌器中，控制坍落度流动和漏斗通过时间。该系统成功地控制了混凝土的填充量。施工体系的发展通过改进施工方法，包括自浇筑混凝土的应用和结构型式的确定，使施工体系合理化。提出了利用红外线对结构进行混凝土填充确认的方法。从可施工性、结构耐久性（质量）和经济性的角度，建立了包括自浇筑混凝土在内的新施工技术评价体系。

Experimental and analytical studies were carried out in order to develop concrete for self- placeable concrete and to establish the manufacturing and construction system for the concrete. Through this research, following results were obtained.1.Development of cementitious materialTesting methods of the qualities of cementitious material were proposed. Using these methods,many kinds of powder material were evaluated. It was concluded that the moderate heat cement is suitable as the standard powder material for self-placeable concrete. On the other hand,it was pointed out that the deformability of concrete depends on the combination of the cement and the super plasticizer.2.Development of material design systemMaterial design system for concrete was established. The system is composed of the mix design system and the durability check system.3.Development of manufacturing systemControl system of the filling capacity of concrete by using two-step mixing was established based on the investigation of the mechanism of mixing. In the upper mixer,surface water of sand is adjusted using the torque of mixer. In the lower mixser, slump flow and funnel passing time are controlled. Filling capacity of concrete are successfully controlled by this system.4.Development of construction systemIt was clarified that the construction system can be rationalized by the improvement of construction method which includes the application of self-placeable concrete and the decision of structural type. Confirmation method of filling of concrete to the structure using infrared rays was developed. Appraisal system of new construction technology,which includes self-placeable concrete,was established from the viewpoint of constructability,durability(quality) of structure and economizability.