콘크리트 교량 방호벽의 균열원인 및 패턴 분석에 대한 연구
Study on Cracking Causes and Patterns in Median Barrier and Guardrail Concrete in RC Bridge
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초록
콘크리트 방호벽 및 중앙분리대는 교량의 부속시설이지만, 슬립폼 시공과 넓은 비표면적으로 인해 초기재령 균열이 발생하기 쉽다. 본연구에서는 대형 교량의 방호벽과 중앙분리대 콘크리트의 외관조사 및 비파괴실험을 수행하여 균열의 원인과 발생 균열의 패턴을 분석하였다. 이를 위해 시공기간을 고려하여, 건조수축, 수화열 해석이 수행되었으며, 현장의 환경조건을 고려하여 소성수축 특성을 평가하였다. 평가결과 대상구조물의 균열 원인은 철근위치에 따른 소성침하균열, 소성수축 및 건조수축에 의한 복부균열, 재료분리에 따른 상부균열로 추정할 수 있었다. 또한 균열원인과 발생 패턴을 도식화하였으며, 시공 및 재료분야에서 균열제어대책을 제안하였다. 해상위 교량에 설치하는중앙분리대 및 방호벽 콘크리트는 환경조건 (풍속, 온도, 습도)에 매우 민감하여 초기재령균열이 쉽게 발생하므로 재료선택 및 시공방법에신중을 기해야 한다.
Abstract
Concrete guide rail and median barrier are an attached RC member, however they are vulnerable to cracking due to slip formconstruction and large surface of member. In this study, causes and pattern of cracking are analyzed through assessment and NDT(Non-Destructive Technique) evaluation for concrete guide rail and median barrier on highway structure. For this work, analysis ondrying shrinkage and hydration heat are performed considering installation period, and plastic shrinkage is also analyzedconsidering their environmental conditions. From the evaluation, plastic settlement around steel location, drying/ plastic shrinkage,and aggregate segregation are inferred to be the main causes of cracking in the structures. The crack causes and patterns areschematized and techniques of crack-control are suggested. Furthermore concrete guide rail/ median barrier in the bridge on the seaare vulnerable to cracking at early age so that special attentions should be paid at the stages of material selection and construction.
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