UTILIZATION OF COAL ASH AS RECYCLING MATERIAL OPTIONS IN VIEW POINT OF GEOENVIRONMENT

摘要: Disposed coal ash is result from the residual of refinery processes and become environmentalimportant issues. Coal consists bottom fly ash. The number production abundant, can be considered as waste material if it not effectively reused or recycled for other application. In engineering practice, utilization additive materials limited in small quantity while disposal quite high. major aim this paper to stress characterization, classification recycling structural view point geoenvironment. Also, prove contribution geotechnical engineering, give benefit practice also part that environmental friendly. Material characteristics involve physical, mechanical, mineral composition chemical properties, including aspect by laboratory tests are presented. Uniaxial test, CBR sulphate resistance test leaching heavy metal contents were conducted ensure environmentally acceptable based on Indonesian standard SNI. Fly grouped F class. Based SNI-03-2460-1991, sample available concrete. Mix design paving block toward several mixes, different volumes cement grasp optimum qualify minimum requirement SNI 03-0691-1996. with quality B, i.e. has compression strength 200 kg/cm2 mixed adding 30% maximum additive, use 50% substitution content kept using 40%. samples resist sulphate. Effect addition ash, lime physical mechanical properties improve index soft soil sub grade layer, increases bearing capacity, well decreases swelling potential. ash-soil mixture contains some metals, but concentration values still under boundary threshold government act PP No. 20, 1990 about criteria water group D.