Synthesis and characterization of coal fly ash-based foamed geopolymer
Fly ash,a residue arising from the combustion of pulverized coal,is one of the major wastes generated in coal-fired power stations.Several utilization options of fly ash are currently being practised in many countries in an effort to minimize waste and protect the environment.This paper studied the potential use of fly ash from South African power utilities in the production of foamed geopolymeric materials which may be suitable for various applications including the building industry.The foamed geopolymers were synthesized through alkali activation of the fly ash and subsequent hydrothermal treatment procedure.This was done by mixing fly ash (FA) with sodium hydroxide (NaOH) and ultrapure water to form a paste,before introducing sodium hypochlorite solution (NaOCl,foaming agent) into the existing paste.The resulting mixture was then placed in the oven to produce the foamed geopolymer.The mixing was done using FA∶ NaOH∶ NaOCl∶ H2O mass ratio of 3.03∶ 1.00∶ 1.14∶ 1.00.The chemical composition,mineralogy,morphology and molecular structure of the starting material (fly ash) and the synthesized product (foamed geopolymer) were analyzed using XRF,XRD,SEM and FTIR respectively.The porosity and the bulk density of the foamed geopolymer was also determined using mercury porosimetry.
Fly ash Geopolymer Alkaline activation Foaming agent Porosity
Sammy M.Nyale Omotola O.Babajide Grant D.Birch Nuran B(o)ke Leslie F.Petrik
Environmental and Nano-Sciences Research Group, Department of Chemistry, University of the Western Cape, Bellville 7535, South Africa
国际会议
2013 International Symposium on Environmental Science and Technology(2013环境科学与技术国际会议)
大连
英文
582-587
2013-06-04（万方平台首次上网日期，不代表论文的发表时间）