본 연구는 환경부하 저감을 위해 슬래그 시멘트를 사용하고 플라스틱 섬유보강재(폴리프로필렌, 나일론, 유리섬유)를 혼입하여 고강도 간격재를 개발하고 현장적용성을 평가하는 연구이다. 이를 위해 예비실험을 통하여 4가지 섬유 복합재의 첨가량이 결정되었다. 또한 역학적 시험(압축, 휨, 인장) 및 내구성 시험(흡수율, 투수율, 길이변화율, 균열저항성, 탄산화, 동결융해)을 통하여 최적의 섬유재를 도출하였으며, 이를 이용한 고강도 섬유재 간격재의 배합 및 생산시스템을 개발하였다. 또한 현장적용성 평가를 통하여 개발된 간격재의 구체 콘크리트 일체성을 확인하였다.
Spacer is a construction material for maintaining cover depth and steel installation, however several problems like staining, leakage, and cracking are currently issued due to performance degradation and unsatisfactory dimensional stability of spacer. Plastic composite is widely used for prevention of brittle failure in cement based material, which yields improvement of crack resistance and ductile failure. This study is for development and applicability evaluation of high strength spacer with slag cement for environmental load reduction and plastic composite like polypropylene fiber, nylon fiber, and glass fiber. For this work, unit weight of 4 different plastic fibers are evaluated through preliminary tests. Physical tests including compressive, flexural, and tensile strength and durability tests including absorption, permeability, length change, crack resistance, carbonation, and freezing and thawing are performed. Through various tests, optimum plastic fiber is selected and manufacturing system for high strength spacer with the selected fiber is developed. Dimensional stability of the developed spacer is evaluated through field applicability evaluation.
