화력발전소 매립 석탄재의 분쇄가 지오폴리머의 강도에 미치는 영향

Abstract

Abstract Bottom ash from coal fired power plants is not widely used due to a broad range of particle sizes and a high carbon contentfor producing geopolymers. The effect of mechanical activation on compressive strength of bottom ash- based geopolymers wasexamined by rod and planetary-ball milling to encourage full-fledged recycling of bottom ash, the main component of pond ash.The amount of amorphous component in the milled ash samples did not change significantly after the mechanical activation. Itis presumably because needle-shaped mullite crystals, which is a major crystalline phase and grown in a glassy matrix, possesshigh strength and toughness, and therefore, they could endure external shocks and remain almost intact. Milling operation, how-ever, decreased the particle size and improved the homogeneity of ash, thereby leading to increase reactivity of milled ash withalkali activators. Rod milling produced a relatively narrow particle size distribution of the milled ash particles; however, it was · Received : July 16, 2014 · 1st Revised : September 1, 2014 · 2nd Revised : October 24, 2014 · Accepted : November 6, 2014Corresponding Author : Sujeong Lee (E-mail : crystal2@kigam.re.kr)Mineral Resources Research Division, Korea Institute of Geoscience & Mineral Resources, 124 Gwahang-no, Yuseong-gu,Daejeon, 305-350 KoreaTel : +82-42-868-3125 / Fax : +82-42-868-3418ⓒThe Korean Institute of Resources Recycling. All rights reserved. This is an open-access article distributed under the termsof the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0/), which permitsunrestricted non-commercial use, distribution and reproduction in any medium, provided the original work is properly cited.