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고 흡수성 폴리머를 혼입한 콘크리트의 기초 물성 및 염화물 침투 저항성 평가

Evaluation of Fundamental Properties and Chloride Penetration Resistance of Concrete Using Superabsorbent Polymers

최소영|김일순|양은익|이찬규
한국구조물진단유지관리공학회 (The Korea Institute For Structural Maintenance and Inspection)|2020.04|한국구조물진단유지관리공학회 논문집 (Journal of The Korea Institute for Structural Maintenance and Inspection)|제24권 제2호|pp. 50-59

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키워드

Curing conditionElectrical resistivity전기저항Fundamental propertiesChloride penetration resistance염화물 침투 저항성양생 조건고 흡수성 폴리머기초물성Superabsorbent polymers
주제분류안전공학

초록

고 흡수성 폴리머(SAP)는 콘크리트 내부에서 물을 흡수하여 팽창하며 물을 방출하면서 수축한다. 이 과정을 통해 콘크리트는 내부 양생 효과를 얻을 수 있지만 팽창한 SAP가 차지하고 있던 공간은 공극으로 존재하게 된다. 따라서 본 연구에서는 SAP를 혼입한 콘크리트의 기초 물성 및 염화물 침투 저항성을 평가하여 SAP의 내부 양생과 공극에 의한 영향을 평가하였다. 또한 SAP에 의한 내부 양생 효과를 평가하기 위해 양생 조건을 수중 양생과 봉함 양생으로 구분하여 실시하였다. 실험 결과, 수중 양생의 압축강도는 혼입율에 따라 큰 차이가 없었으며, 봉함 양생의 경우에는 SAP의 혼입율이 증가함에 따라 압축 강도가 증가하는 경향을 나타냈다. 봉함 양생의 경우 내부 양생 효과가 압축 강도 증가에 영향을 준 것으로 판단된다. 염화물 확산계수 측정 결과, SAP의 혼입율 증가에 따라 확산계수가 감소하는 경향을 나타냈으며, 특히 봉함 양생은 내부 양생 효과로 인해 수화 반응이 촉진되어 염화물 침투 저항성이 더욱 개선된 것으로 판단된다. 양생 조건이 다른 경우 표면 전기저항을 이용해 염화물 침투 저항성을 평가하는 것은 부적절한 것으로 판단된다.

Abstract

Superabsorbent Polymer (SAP) expands inside concrete by absorbing water and contracts as it discharges water. Through this process, concrete can achieve the internal curing effect, but the space occupied by the expanded SAP remains as a void. In this study, the effects of SAP internal curing and voids were evaluated by evaluating the fundamental properties and chloride penetration resistance of SAP mixed concrete. Also, to evaluate the internal curing effect by SAP, the tests were carried out under water and sealed curing conditions, respectively. From the result, the compressive strength of water curing did not differ significantly according to the mixing ratio of SAP. In the case of sealed curing, however, the compressive strength tended to increase as the mixing ratio of SAP increased. The internal curing effect of sealed curing was considered to have influenced the increase in compressive strength. In the case of the chloride diffusion coefficient, the diffusion coefficient tended to decrease as the mixing ratio of SAP increased. In particular, as the sealed curing is applied, the chloride penetration resistance is further improved due to internal curing effect. If the curing conditions are different, it is considered inappropriate to estimate the chloride penetration resistance by the surface electrical resistivity.

참고문헌 (25)

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