文献类型：期刊文献

英文题名：High strength products made with high volume of rejected fly ash

作者：Qiao, X.C.[1]; Zhou, B.[1]; Yu, J.G.[1]

机构：[1] School of Resource and Env. Enggr., East China University of Science and Technology, Shanghai, China

年份：2009

起止页码：501

外文期刊名：Excellence in Concrete Construction through Innovation - Proceedings of the International Conference on Concrete Construction

收录：EI(收录号：20111013726561)

语种：英文

外文关键词：Fly ash - Sodium sulfate - Emulsification - Coal ash - Silicate minerals - Mullite - Polypropylenes - Compressive strength - Portland cement

摘要：The rejected coal fly ash (RFA) with a particle size larger than 45 p,m has remained relatively unused due to a high carbon content and large particle size. It is hence necessary to develop appropriated activation and preparation methods in order to reuse RFA. The mineralogy and chemical properties of RFA have been characterized. RFA has been blended with ordinary Portland cement and chemical additives. The blended materials were compressed to form specimens which were cured at 60°C for 7 days. Physical properties and micro-structures of the specimens prepared have been investigated. The results show that main minerals in RFA are mullite and quartz. The addition of Na 2SO4 benefits to the strength development of specimen with RFA. Na2SiO3 and Ca(OH)2 significantly elevate strength development of cement-free RFA sample. The samples with 85 wt. % of ground RFA, 10 wt. % of Ca(OH)2 and 5 wt. % of Na2SiO 3 had compressive strength of 48.1 MPa at 7 days. Adding polypropylene emulsion into RFA specimen has little effect on the strength development. ? 2009 Taylor & Francis Group, London.