Investigation of strength and durability of fly ash based geopolymer concrete using recycled aggregate with silica fume

Abstract

One of the greatest substitutes for typical Portland cement concrete is Geo Polymer Concrete (GPC), which contains no cement. Cement manufacture results in significant emissions of the greenhouse gas carbon dioxide, yet the pollution and warming of the planet are still consequences. Cement made from portland requires a large amount of energy, making it a pricey product. It also minimizes pollutants and is environmentally beneficial. The old concrete and debris from destroyed buildings pollutes the environment, necessitating the construction of new space to accommodate the disposed of waste. The aggregate in the old concrete is removed without any existing mortar and cleaned to be used as coarse aggregate in the geo polymer concrete in order to decrease this pollution. Recycled aggregate refers to this particular kind of material. Geo polymers are a kind of mineral binders that have a polymeric silicon-oxygenaluminum framework. Geo polymer concrete decreases CO2 emissions from the cement industry by around 80%, which helps to slow global warming. In the geo polymerization process, which is the technology utilized to make the binding material, the silicon- and aluminum-rich source material is created. Chemical reactions at very alkaline circumstances yield polymers with a three-dimensional polymer chain and rings made of silicates, oxosilicates, and aluminium oxides. Fly ash, slag, red mud, rice husk ash, and silica fume may all be used in the manufacturing of geo polymers. All sorts of construction projects may benefit from GPC manufactured from fly ash because of its increased characteristics. It may be used to create a wide range of structures, uses fewer natural resources, has superior early strength, and is less costly than other materials. This led to the majority of studies recommending recycled aggregates as an alternative to conventional concrete or natural aggregate concrete, however the results were mixed.