|
Title |
Influence of Mixtures and Curing Conditions on Strength and Microstructure of Reactive Powder Concrete Using Ternary Pozzolanic Materials
|
|
Authors |
Khulgadai Janchivdorj ; 최승훈 ; 소형석 ; 서기석 ; 소승영 |
|
DOI |
https://doi.org/10.4334/JKCI.2013.25.4.457 |
|
Keywords |
반응성 분체 콘크리트 ; 3성분계 포졸란재 ; 강도 ; 미세구조 ; 양생방법 reactive powder concrete ; ternary pozzolanic material ; strength ; microstructure ; curing condition |
|
Abstract |
This study discussed the influence of mixtures and curing conditions on the development of strength and microstructure of RPC using ternary pozzolanic materials. Through pilot experiment, various RPC was manufactured by adding single or mixed ternary pozzolanic materials such as silica fume, blast furnace slag and fly ash by mass of cement, up to 0~65%, and cured by using 4 types of method which are water and air-dried curing at 20℃, steam and hot-water curing at 90℃. The results show that the use of ternary pozzolanic materials and a suitable curing method are an effective method for improving development of strength and microstructure of RPC. The unit volume of cement was greatly reduced in RPC with ternary pozzolanic materials and unlike hydration reaction in cement, the pozzolanic reaction noticeably contributes to a reduction in hydration heat and dry shrinkage. A considerable improvement was found in the flexural strength of RPC using ternary pozzolanic materials, and then the utilization of a structural member subjected to bending was expected. The X-ray diffractometer (XRD) analysis and Scanning Electronic Microscope (SEM) revealed that the microstructure of RPC was denser by using the ternary pozzolanic materials than the original RPC containing silica fume only.
|