Abstract
In this study, to utilize excess silica fume that cannot react owing to the low water-binder ratio of ultra-high-performance concrete (UHPC), Ca(OH)<sub>2</sub> was substituted and mixed at 1-5%, relative to the weight of the cement, to produce UHPC. Then, the effect of this Ca(OH)<sub>2</sub> substitution on the hydration properties of UHPC and the pullout resistance of embedded steel fibers were investigated. The results of a thermogravimetric test show that when the substitution rate of Ca(OH)<sub>2</sub> increased, the amount of cement decreased slightly. However, Ca(OH)<sub>2</sub> accelerated the hydration reaction to form dense C-A-S-H. In CH-2 in which the DTG peak is maximized, the compressive strength, average adhesion strength, drawing energy, and equivalent adhesion strength were 141 MPa, 22.5 MPa, 680.4 mJ, and 22.6 MPa, respectively. Moreover, when the substitution rate exceeded 2%, all mechanical performance results deteriorated.
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