| Title |
Properties of Concrete Using Mineral Admixture & Limestone Powder with Different Fineness |
| Authors |
Park Cho-Bum ; Lee Mun-Hwan ; Ryu Deug-Hyun |
| Keywords |
Limestone Powder ; Mineral Admixtures ; Fineness ; Strength Increase |
| Abstract |
Many studies on the improvement of performance of concrete which is main construction material are conducted to the growth of construction technology, and there have recently been attempts to improve the performance of concrete using various admixtures. In this study, in order to use limestone powder which is currently used in various fields as admixtures for concrete, blast furnace slag and fly ash were used with limestone powder also. The properties of concrete using limestone powder are evaluated to use 3 kinds of fineness. The results of concrete experiment using limestone powder with blast furnace slag and fly ash are as follows.
(1) As the usage of limestone powder was increased, the fluidity of concrete improved and it was found that the mixture which used blast furnace slag increased slump and air content, and change of elapsed time more than the mixture using fly ash. (2) The unit weight content and ultrasonic pulse of concrete using limestone powder either decreased or was similar to basic mixture. So it is judged that limestone powder was filled with porosity of concrete, and thus that the air content of concrete decreased relatively by filling of limestone powder. (3) The compressive strength using limestone powder was similar to basic mixture at an early age, but as the usage of limestone powder increases, the compressive strength decreased on days 28 and 91, and the rate of strength decrease was lower as the fineness of limestone powder was higher.
Therefore, the concrete using limestone powder and blast furnace slag powder has a significant effect on the improvement of fluidity, and the rate of strength decrease of concrete using high fineness of limestone powder was lower. When the limestone powder is used for concrete with mineral admixture, it was more effective if used with blast furnace slag than with fly ash. |