Geopolymer Development by Powders of Metakaolin and Wastes in Thailand

Chayanee Tippayasam,Elie Kamseu,Sansanee Boonsalee,Suvimol Sajjavanich,Duangrudee Chaysuwan,Chiara Ponzoni

doi:10.4028/www.scientific.net/ast.69.63

Chayanee Tippayasam, Elie Kamseu + Show 4 more

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https://doi.org/10.4028/www.scientific.net/ast.69.63

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Abstract

Geopolymer has been developed as an alternative material to Portland cement. Geopolymer is based on the polymerization of alkaline activation and oxide of silicon and aluminium. These oxides can be found in many pozzolanic materials such as metakaolin and the wastes from industries and agricultures in Thailand, e.g., fly ash, bagasse ash and rice husk ash. Pozzolanic materials were selected as source materials for making geopolymers into 4 different types. Sodium hydroxide concentration of 10 Molar (10MNaOH) and sodium silicate (Na2SiO3) solutions were used as alkaline activators by the mass ratio of Na2SiO3/NaOH at 1.5. The mixtures were cast in 25×25×25 mm. cubes. After casting, the geopolymers were cured at 80๐C for 24 hrs. in an oven and then at room temperature for 7 days. The pozzolanic materials effects, the Si/Al molar ratio and the Na/Al molar ratio were studied and characterized. An X-ray fluorescence (XRF) was chosen to determine the percentages of silica and alumina in order to verify the proper ratio of the fly ash, Rice husk ash, Bagasse ash and Metakaolin.The study also included the impact on mechanical and physical properties such as compressive strength, water absorption, density and porosity.

Highlights

Geopolmer was first originated by Davidovits (1979) to designate a new class of three dimensional silico-aluminate materials[1]
These oxides can be found in many pozzolanic materials such as metakaolin and the wastes from industries and agricultures in Thailand, e.g., fly ash, bagasse ash and rice husk ash
It was found that the compressive strength of geopolymer with Fly ash (FA) obviously dropped when the percentage of alkali liquid exceeded 30%, whereas with Bagasse ash (BA), Rice husk ash (RHA) and MK, the strength increased as the quantity of alkali liquid increased

Summary

Introduction

Geopolmer was first originated by Davidovits (1979) to designate a new class of three dimensional silico-aluminate materials[1]. The geopolymer is produced by totally replacing the ordinary Portland cement. The use of geopolymer concrete to replace the cement is to reduce the CO2 emissions by the cement industries [2]. Geopolymerization can be applied to utilize solid wastes and by-products containing silica and alumina which are called ‘Pozzolans’. A geopolymer is environmentally friendly [3] which is attractive to increase attention in various research fields as a construction material[4]. Pozzolans from industrial and agricultural by-products such as fly ash, bagasse ash and rice husk ash were used to produce geopolymers in this research

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