Synthetic Study on Self-Placeable Concrete

自浇混凝土综合研究

基本信息

批准号：
03302044
负责人：
OKAMURA Hajime
金额：
$ 15.62万
依托单位：
University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for Co-operative Research (A)
财政年份：
1991
资助国家：
日本
起止时间：
1991 至 1992
项目状态：
已结题

项目摘要

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.

为了开发自浇混凝土混凝土并建立混凝土的制造和施工系统，进行了实验和分析研究。通过本研究，取得了以下成果：1.胶凝材料的发展提出了胶凝材料性能的测试方法。利用这些方法对多种粉末材料进行了评价。结论：中热水泥适合作为自浇混凝土的标准粉料材料。另一方面，指出混凝土的变形能力取决于水泥和高效减水剂的组合。2.材料设计系统的开发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。3.制造系统开发在对搅拌机理研究的基础上,建立了两步式搅拌混凝土填充能力控制系统。在上部搅拌机中，利用搅拌机的扭矩调节砂的表面水份。在下部混合器中，控制坍落度流量和漏斗通过时间。该系统成功地控制了混凝土的填充能力。4.施工系统的开发阐明了通过改进施工方法，包括自浇混凝土的应用和结构类型的确定，可以使施工系统更加合理。开发了利用红外线确认结构中混凝土填充的方法。从施工性、结构耐久性（质量）和经济性的角度，建立了自浇混凝土等新型施工技术评价体系。