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충남대학교 건설재료시공학연구실

Building material & construction lab.

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국외학술발표

JEONGSOO NAM, YASUJI SHINOHARA, TOSHIYUKI ATOU, HONGSEOP KIM, GYUYONG KIM (2016), IMPACT RESISTANT PERFORMANCE OF DUCTILE FIBER REINFORCED CEMENTITIOUS COMPOSITES (DFRCCs), 9th International Conference on Fracture Mechanics of Concrete and Concrete Structures (FraMCoS-9)
JEONGSOO NAM, YASUJI SHINOHARA, TOSHIYUKI ATOU, HONGSEOP KIM, GYUYONG KIM (2016), IMPACT RESISTANT PERFORMANCE OF DUCTILE FIBER REINFORCED CEMENTITIOUS COMPOSITES (DFRCCs), 9th International Conference on Fracture Mechanics of Concrete and Concrete Structures (FraMCoS-9)
작성자 관리자
조회수 72 등록일 2016.05.29
주저자 JEONGSOO NAM
교신저자 042-821-7731
공동저자 TOSHIYUKI ATOU, HONGSEOP KIM, GYUYONG KIM
학술지명 9th International Conference on Fracture Mechanics of Concrete and Concrete Structures (FraMCoS-9)
ABSTRACT
The aim of current study is to investigate the impact resistant performance of ductile fiber reinforced
cementitious composites (DFRCCs) containing 1.5 % volume fraction of polyvinyl alcohol and steel
fibers subjected to high velocity impact of steel projectile (the diameter of 19.05 mm and the mass of
28.13 g). To investigate the impact resistant performance of DFRCCs, gunpowder impact facility was
used for impact tests, and the impact velocity was from about 450 to 750 m/s except for the plain
specimens (non-fiber reinforced cemenetitious composites). The dimension of a specimen is a square
of 300 mm and a thickness of 100 mm. The specimens with and without fibers after high velocity
impact tests were damaged in various failure modes, which are penetration, scabbing, and perforation.
For DFRCC specimens, the failure modes were limited to the penetration grade under the impact
velocity of about 700 m/s, which is more than two times of the plain specimen. Additionally, DFRCC
specimens did not caused critical damage such as scabbing and perforation, up to the impact velocity
of 725 m/s. The mass loss of the plain specimen was proportional to the impact velocity of steel
projectile, while DFRCC specimens were not significantly affected by the impact velocity of steel
projectile. Moreover, DFRCC specimens have superior capacity on the scabbing limit, and slightly
bulged in the back side under the impact velocity of 700 m/s. In perforating, the debris of the plain
specimen has significantly scattered from a position of the front side in the cross section of the
specimen. Hence, the damaged area has spread widely from the front side through the back side of the
specimen. However, the debris of DFRCCs slightly scattered around a position of the back side in the
cross section of the specimen as compared with the plain specimen. This is due to the perforated time
was delayed by reinforcing fibers. It can be seen from the test results that DFRCCs have superior
impact energy absorbing capacity under high velocity impact of projectile. Consequentially, in this
study, we examined that principal fracture characteristics of DFRCCs subjected to collision of steel
projectile, and verified that impact resistant performance was improved by reinforcing polyvinyl
alcohol and steel fibers.