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Properties of Ultra High Performance Fiber Reinforced Cementitious Composites Mixed with Limestone Powder  

Han, Sang-Mook (금오공과대학교 토목환경공학부)
Wu, Xiang-Guo (금오공과대학교 토목환경공학부)
Publication Information
Journal of the Korean Society of Hazard Mitigation / v.8, no.2, 2008 , pp. 23-30 More about this Journal
Abstract
UHPC has high performance, high strength and excellent mechanical properties. Moreover UHPC(Ultra High Performance Cementitious Composite) has advantage to reduce cross section under the same load compared with other kinds of concrete. But silica fume which is imported from foreign country has a abundant portion in UHPC mixture in comparison with normal concrete. This is one of the main reason to raise the construction cost. Superior mechanical properties of UHPC due to the optimum filling composition can be changed by replacing the very fine ingredient. The purpose of this research is to grasp the characteristic of UHPC which silica fume and silica flour is replaced with limestone powder. This experiment can be divided into three classes according to the kinds of replacement. The compressive strength and flow of all types were measured and microstructure and hydration phenomena for comparing RPC were analyzed by SEM, XRD, NMR method. As a result, the replacement can be considered to be effective by for the decrease of the UHPC structure construction cost and improvement of the fresh UHPC.
Keywords
UHPC; RPC; Silica fume; Limestone powder; SEM; XRD; NBR; UHPCC; NMR;
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