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Title |
Comparative Study of Properties of PE Fiber-Reinforced Highly Ductile Cementitious Composite according to the Particle Size of Fine Aggregate
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DOI |
https://doi.org/10.4334/JKCI.2021.33.1.075 |
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Keywords |
고연성; 시멘트 복합체; 잔골재; 입경 크기; 충전밀도 high ductility; cementitious composite; fine aggregate; particle size; packing density |
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Abstract |
This study was intended to investigate the properties of PE fiber-reinforced highly ductile cementitious composite with the condition that several different particle sizes of river sand replace microsilica sand as fine aggregate for the material. Experiments for flowability, strength, and tensile behavior were performed. Four different river sands the particle sizes of 0.23 mm, 0.45 mm, 0.89 mm, and 1.77 mm, as well as microsilica sand with mean particle size of 0.29 mm, were considered for comparison. Flowability estimated from flow test was revealed to improve as the particle size of fine aggregate increased. The relation between flowability and particle size was analyzed by calculating the packing density of solid particles in the mix. Compressive strength decreased as larger size of fine aggregate was used, and the relation between these was proven by comparing the estimated paste maximum thickness. As for the uniaxial tensile behavior, first cracking strength, maximum tensile stress, tensile strain capacity, and the number of cracks all decreased as the particle size of fine aggregate increased. These results for tensile behavior are thought to be related to strength and fracture energy of the matrix, depending on the particle size of fine aggregate.
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