| Title |
An Evaluation of Slump Loss for Elapsed Time and Mechanical Behavior of the Recycled Aggregate Concrete Mixed with Blast-Furnace Slag |
| Authors |
Yang Keun-Hyeok ; Kim Yong-Seok |
| Keywords |
recycled aggregate concrete ; blast-furnace slag ; recycled aggregate maximum size ; slump loss for elapsed time |
| Abstract |
The objective of this study was to understand the influence of the replacement level of the recycled aggregate on the slump loss for elapsed time and the mechanical behavior of concrete mixed with blast- furnace slag. Main variables were the replacement level of recycled aggregate, blast-furnace slag and recycled aggregate maximum size. The water-binder ratio of 0.45 and water contents of 175kgf/m3 were determined according to the designed compressive strength of concrete using natural aggregate only. Also, Superplasticizer was added to satisfy the initial slump of 250mm. Test results showed that the slump loss for elapsed time and the compressive strength were deteriorated rapidly when the replacement level of recycled aggregate was larger than 50%. Based on test results and non-linear regression analysis by the SPSS program, models evaluating the slump loss for elapsed time, splitting tensile strength, fracture modulus, elastic modulus and strain at peak stress were developed. |