A Study on the Effect of Superplasticizers on Concrete withRecycled Fine Aggregates

• Main Authors: Chen-Ping Hung, 洪鎮平
• Other Authors: Chung-Ming Ho
• Format: Others
• Language: zh-TW
• Published: 2010
• Online Access: http://ndltd.ncl.edu.tw/handle/41531691519509332787

碩士 === 中原大學 === 土木工程研究所 === 98 === Abstract The purpose of this paper is to investigate the effect on the properties of recycled concrete with various percentages of fine aggregates replaced by discarded tile. To superplasticizers as variables, without Addition of superplasticizers for the control group and had Addition of superplasticizers as the experimental group of compressive strength, ultrasonic pulse velocity value, and loss of ignition of recycled concretes subjected to elevated temperatures are carried out in this study. Experiment results showed that the compressive strength and ultrasonic pulse velocity have decreased when more recycled aggregates are used. Addition of superplasticizers does not have this phenomenon, the control group in the early age (7 days, 14 days) compressive strength, ultrasonic pulse velocity value was slightly lower than the experimental groups , but in the late age (28 days, 91 days) will go beyond the experimental groups .Experiment results revealed that the elevated temperature would enhance the compressive strength of recycled concrete at 300℃, and improve at the age of 28 days is better than age of 91 days. In the range 440-800℃, recycled concrete lost most of their original compressive strength and ultrasonic pulse velocity, and the control group, the experimental group were above phenomenon, but the control group, the value of compressive strength and ultrasonic pulse velocity of the experimental group performed better than that. Experiment results revealed that the loss of ignition without addition of superplasticizers are better than a addition of superplasticizers in the same replace. To support the correctness of the compressive strength and ultrasonic pulse velocity test.