Study on the Mix Proportioning Design of Recycled aggregates concrete

• Main Authors: Hung-Chih Tien, 田宏智
• Other Authors: 吳卓夫
• Format: Others
• Language: zh-TW
• Published: 2006
• Online Access: http://ndltd.ncl.edu.tw/handle/30474626615949868518

碩士 === 中華大學 === 營建管理研究所 === 94 === The research object is the recycled concrete produced by the discarded concrete block from demolished buildings. Taguchi method is applied for experiment configuration to discuss its nature and find out the best proportion. Different “water consumption” (120kg, 150kg, 180kg), “cement consumption” (200kg, 250kg, 280kg) and “fly ash consumption” (150kg, 180kg, 300kg) and their interactions are adopted to understand their influence on the “compressive strength”, “velocity of sound” and “resistance” of recycled aggregates concrete. Furthermore, three standards are selected as the experiment design of this research and hypothesize: there are interaction between water consumption and cement consumption, water consumption and fly ash consumption, and cement consumption and fly ash consumption. It shows that in terms of resistance, the age of 28 days in recycled aggregates concrete is slightly lower standard 20 kΩ-cm; in terms of compressive strength, the age of 28 days could comply with the requirement of low-medium strength (210kgf/cm²~280kgf/cm²); and in terms of velocity of sound, the age of 28 days could achieve the requirement of 4000m/sec. The best proportion combination from this research is, water consumption 150Kg, cement consumption 250Kg and fly ash consumption 300Kg.