CSA 팽창재를 혼입한 철근보강 모르타르의 인장 경화-연화 특성에 관한 실험적 연구
Experimental Study on Tension-Hardening and Softening Characteristics in Reinforced Mortar with CSA Expansion Agent
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초록
팽창재는 콘크리트의 건조/자기수축으로 인한 균열에 매우 효과적인 혼화재료이며 콘크리트 내부 철근에 화학적 프리스트레스를 인가할수 있다. 본 논문에서는 CSA 팽창재에 의해 화학적 프리스트레스가 도입된 모르타르의 인장경화성능을 평가하였다. 철근으로 내부구속이이루어진 철근 모르타르 시편에 대하여 일축인장시험을 수행하였으며, 균열거동 특성과 인장경화 특성을 분석하였다. CSA 모르타르에서는압축강도 및 탄성계수는 약간 감소하였으나, 화학적 압축응력이 철근에 도입되었으며, 일반 모르타르 부재에 비해 167.5% 초기균열하중이증가하였다. 높은 인장경화특성을 평가하였으며, 기존의 인장연화모델과 실험값을 비교하여 기존 제안식의 보완점을 제시하였다.
Abstract
Expansion agent is a very effective admixture for prevention of cracking due to autogenous/drying shrinkage and this can induceinternal chemical prestress to embedded reinforcement. In this paper, tension-softening and hardening in cement mortar with steeland CSA expansion agent are experimentally evaluated. Cement mortar with steel reinforcement is prepared and tensile strength testis performed for evaluation of cracking and tensile behavior. In spite of slightly reduced strength and elasticity in CSA mortar,significantly increased tension-hardening behavior is evaluated in CSA mortar with induced chemical prestress. Furthermoreprevious tension softening models are compared with the test results and improvement are proposed.
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