GEO-POLYMERISATION OF AGRO-WASTES AS ADDITIVES FOR CONCRETE PRODUCTION

S.A Oladapo, E.A Adetoro, I.O. Olofintuyi

Abstract


This research work focused on the effects of source materials, aggregate type and size on mechanical performance of geopolymer concrete. Three source materials (i.e. Rice Husk Ash (RHA), Sawdust Ash (SDA) and Cow Dung ash (CDA))were used. The sums of alumina and silica oxides in them were determined as 81.28%, 72% and 71.2% respectively. The mixing ratio of material constituents used in producing geopolymer concrete was 1:2:4. The source materials were used with alkaline solution to produce a binder for geopolymer concrete. The alkaline solution was a combination of sodium hydroxide and sodium silicate in ratio 10:25 and the ratio of alkaline solution to source material was 4:10. 20mm granite was used and the grading properties of the source materials and coarse aggregates were obtained. The workability of all the concrete produced was determined at different curing hours of 24hrs, 48hrs, 72 hrs and at a constant temperature of 100oC. The geopolymer concrete produced were subjected to sulphate attack and sulfuric acid resistance in order to determine their durability The results obtained revealed that both compressive and flexural strengths increased as curing hours and aggregate sizes increased for all source materials and aggregate types used but RHA-geopolymer concrete produced with 20mm granite gave better performance with the highest compressive and flexural strengths at each curing hour. Its durability is better in comparison with conventional concrete. The use of geopolymer concrete should be encouraged because of its high resistance to sulphate attack, environmental protection and high workability.

KEYWORDS: Geopolymer concrete, Rice Husk Ash, Saw Dust Ash, Cow Dung Ash, Flexural strength,  Compressive strength  


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