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Title |
Evaluation of Crack Resistant Performance in Cement Mortar with Steel Fiber and CSA Expansion Admixture
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Keywords |
강섬유 ; CSA 팽창재 ; 균열저항성 ; 초기 균열하중 ; 파괴에너지 Steel fiber ; CSA expansion agent ; Crack resistance ; Initial cracking load ; Fracture energy |
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Abstract |
Steel fiber is a effective composite for crack resistance and improve structural performance under tensile loading. This study presents an evaluation of crack resistance and structural performance in cement mortar with steel fiber and expansion agent through internal chemical prestressing. For this work, cement mortar samples with 10% replacement of cement binder with CSA (Calcium-Sulfo-Aluminate) expansion agent and 1% volume ratio of steel fiber are prepared. Including basic mechanical properties, initial cracking load and fracture energy are evaluated in cement mortar beam with notch. Initial cracking load and fracture energy in cement mortar with CSA and steel fiber increase by 1.75 and 1.41~1.53 times compared with those in cement mortar with steel fiber. With optimum mix design for steel fiber and CSA expansive agent, the composite with chemical prestressing can be applied to various members and effectively improve crack resistance to external loading.
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