순환유동층 보일러애시를 활용한 비소성 결합재로써의 활용 가능성 검토
Feasibility Study on the Use of CFBC Ash as Non-sintered Binder
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초록
최근 화력발전소에서는 순환유동층 연소방식의 발전소가 증가하는 추세이다. 순환유동층 보일러애시는 탈황 효과를 위해 석회석을 첨가함에 따라 애시 중에 포함되는 CaO, SO3성분이 증가하여 일반적인 플라이애시 보다 free-CaO 함량이 높다. 또한 순환유동층 보일러애시는 기존의 플라이애시와 다르게 자기수경성 특성과, 높은 free-CaO함량에 의해 물과 만나면 높은 반응성을 갖는다. 본 연구는 순환유동층 보일러애시의 자기수경성 특성을 이용하여, 시멘트를 대체할 수 있는 비소성 결합재로써 활용 가능성에 대해 분석하였다. 순환유동층 보일러 애시의 함량에 따른 역학적 및 수화특성에 대해 검토하였다. 또한 석고의 종류 및 함유량에 따른 순환유동층 보일러애시 활용 비소성 결합재에 대한 압축강도 및 미세구조에 미치는 영향을 분석하였다.
Abstract
Recently, the production of circulating fluidized bed combustion ash has been increased in thermal power plants. The addition of limestonefor the desulfurizing effect of circulating fluidized bed boiler ash increases the content of CaO and SO3 contained in ash, which is higher than the freefly ash in general fly ash. Unlike conventional fly ash, the circulating fluidized bed combustion ash has a high reactivity when it comes into contactwith water due to its hydraulic properties and high free-CaO content. The aim of this study is to investigate the possibility of non-sintered binderby using self-cementing properties of circulating fluidized bed combustion ash. The mechanical and hydration characteristics were investigatedaccording to the content of CFBC ash. In addition, the effects of gymsum type and content on the compressive strength and micro-structure ofnon-sintered binder pastes
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