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IJSTR >> Volume 8 - Issue 7, July 2019 Edition

International Journal of Scientific & Technology Research  
International Journal of Scientific & Technology Research

Website: http://www.ijstr.org

ISSN 2277-8616

Properties And Microstructural Characteristics Of Lightweight Geopolymer Concrete With Fly Ash And Kaolin

[Full Text]



Adji Sutama, Anis Saggaff, Saloma, Hanafiah



Lightweight geopolymer concrete, fly ash, kaolin, concentration of NaOH.



Lightweight geopolymer is a new innovation in concrete industry. It has an advantage because it could act as geopolymer as well as lightweight concrete. It is environmentally friendly since it is not produced with Portland cement which normally emit CO2 gas, a major contributor of greenhouse gases and global warming in the atmosphere. The material used in this experimental study are precursors, fine aggregates, alkaline activator solutions, superplasticizers, and foam. The precursors used were fly ash and kaolin, in which the percentage of kaolin were 0%, 5%, 10%, 15%, and 20% of the weight of fly ash. The concentration of NaOH at 12M and 14M. The results from the flow table test revealed that the optimum diameter of the mixture was 25.28 cm, which was found when the percentage of kaolin was 0% and the concentration of NaOH was 12M. The results of setting time showed that the fastest initial and final setting time of the mixture were 245 and 360 minutes respectively, also discovered when the percentage of kaolin was 0% and 12M NaOH. In addition, the optimum compressive strength of the mixture was 19.20 MPa, discovered when the density was 1481.12 kg/m3, percentage of kaolin was 0% and at 14M NaOH. Then, the microstructure analysis of the mixture showed that increasing the concentration of NaOH without adding kaolin produced a dense geopolymer matrix with very small pores, however, when kaolin is increasingly added to the mixture, it produced a less dense matrix with large pores. In conclusion, mixtures without kaolin resulted in lightweight geopolymer with better properties and characteristics.



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