A Study on the Application of Construction Wastes on High Performance Concrete

• Main Authors: Min-Tsung Hung, 洪敏琮
• Other Authors: Chung-Ming Ho
• Format: Others
• Language: zh-TW
• Published: 2006
• Online Access: http://ndltd.ncl.edu.tw/handle/09357962667309888165

碩士 === 中原大學 === 土木工程研究所 === 94 === Abstract 　　In recent years, because of the rising of the environmental protection consciousness and the lacking of construction waste dumping yard, recycle use of the construction waste has been actively promoted by the government. In the past, construction waste was commonly used in filling out the sea and creating lands. This research is mainly to study the possibility of using the construction waste, together with superplasticizers, to produce high performance concrete. High performance concrete using construction waste was mixed in the laboratory with different amount of superplasticizers. Then their mechanic properties, high temperature effect and thermal conductivity is tested and compared with that of ordinary high performance concrete using natural aggregates. Optimum amount of superplasticizers can be determined from the test results. Then, the object of the study is changed to the water-to-cement ratio and the amount of recycled aggregate used. Their mechanical properties, high temperature effect and thermal conductivity are tested in order to find out the best ratio. 　　The test results show that, the slump-flow versus the amount of superplasticizers in recycled high performance concrete is the same as that of the general high performance concrete. Best performance occurs when the water-to-cement ratio is 0.3 and 1.2% superplasticizers is added. The compressive strength is only reduced by 30% compared with the general high performance concrete. The trends in thermal conductivity coefficient are almost identical. Since recycled aggregates have more voids and contains more, the thermal conductivity coefficient is less in recycled high performance concrete. Thereafter, the study is to find out the effect of high temperature on the compressive strength of recycled high performance concrete, and their lost of ignition.