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Title |
Impact Fracture Behavior under Temperature Variation and Compressive·Flexural Strength of Cement Composites using VAE Powder Polymer and PVA Fiber
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Authors |
허광희(Gwang-Hee Heo) ; 박종건(Gong-Gun Park) ; 김충길(Chung-Gil Kim) ; 이형준(Hyung-Joon Lee) ; 최원석(Won-Seok Choi) |
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DOI |
https://doi.org/10.11112/jksmi.2019.23.1.102 |
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Keywords |
PVA 섬유 ; VAE 분말 폴리머 ; 시멘트복합체 ; 휨강도 PVA fiber ; VAE powder polymer ; Cement composites ; Flexural strength |
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Abstract |
This paper studies impact fracture behavior under temperature variation and compressive·flexural strength of cement composites using VAE(vinyl acetate ethylene) powder polymer and PVA(polyvinyl alcohol) fiber. Impact test were conducted in the temperature range selected for the ?35℃, 0℃ and 35℃. In this experimental study, impact test were carried out using a drop impact testing machine (Ceast 9350) to obtain such as displacement, time, and impact fracture energy of normal specimen and and cement composites specimen. As test results, the use of VAE powder polymer and PVA fiber were observed to enhance the flexural strength of mortar. The compressive strength of PVA fibers reinforced cement composites was slightly decreased at 28 days, but the flexural strength was observed to increase 24.4% of normal mortar strength. As a result of the drop impact tests, PVA fiber reinforced cement composites specimens showed microcracks due to energy dispersion and crack prevention with bridge effect of the fibers, and scabbing or perforation by impact was suppressed. On the other hand, the normal mortar and VAE powder polymer cement composites specimens were carried out to the perforation and macro crack. Most of normal mortar and the cement composites subjected to impact load on specimens shows mostly local brittle failure. The impact resistant performance of the specimen with PVA fiber was greatly improved due to the increase of flexure performance.
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