A Review on Selected Durability Parameters on Performance of Geopolymers Containing Industrial By-products, Agro- Wastes and Natural Pozzolan

Abstract

The applications of geopolymers as cementitious systems are becoming an alternative source of cement daily. The use of potentially suitable aluminosilicate inorganic waste materials incorporated with agro-industrial waste in the production of suitable geopolymer binders has been reported. Calcined clay and some agro-waste ash, such as coconut shells, are examples of aluminosilicate materials that exhibit strong pozzolanic activity because of their high silica-alumina composition. The pozzolanic reaction is primarily caused by the amorphous silica present in properly burned agricultural waste and clay. Based on a variety of available literature on concrete and mortar including geopolymers synthesized from agro-industrial waste, a critical review of raw materials and the mechanism of synthesis of the geopolymer has been outlined in this work. Additionally, the durability characteristics of agro-industrial waste geopolymer concrete and mortar, including resistance to chloride, corrosion, sulfate, acid attack, depth of carbonation, water absorption, thermal resistivity, Creep and drying shrinkage, are briefly reviewed.

Keywords

• agro-industrial waste
• calcined clay
• coconut ash
• durability
• geopolymer

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