Investigation on the significance of Mineral admixtures and fibres in Enhancing geopolymer concrete Properties to resist high Circumferential stresses at Elevated temperatures

Abstract

Fly Ash is one of the mineral admixtures which can be used as pozzolanic content in concrete. Utilization of fly ash in concrete is a waste management technique. Fly ash can be fully utilized as binding content in GPC. Effective utilization of fly ash is made on the GPC. This type of concrete is reported to show better mechanical resistance and highly durable than conventional concrete. GPC needs special curing heat or steam curing is preferred. The ingredients of GPC are its source material and stimulator solution. Source material should be enriched with minerals such as silica and alumina. Stimulator solution should contain silicates and hydroxides. Replacements are made on the source material, coarse aggregate, alkaline solution, etc. Secondary reinforcements in such a concrete will elevate the mechanical resistance and more durable. Fibres glass fibres, basalt fibres, polypropylene fibre etc, can be adapted as secondary reinforcements. The research is divided into two phases basic phase and advanced phase. newlineIn the basic phase, the engineering properties of the materials required for the production of GPC were determined. In this present investigation, quarry rock dust was replaced partially and fully with river sand. Three combinations were made - i) FA + RS + CA ii) FA + MF (river sand + quarry rock dust) + CA iii) FA + QRD + CA. Mix designs for 30 MPa were achieved. PPF were added to the concrete from 0 to 2% at 0.25% interval. Specimens were admitted to different curing. As all the literatures insist that heat curing produced better results when compared to ambient curing. Compressive strength, split tensile strength, flexural strength tests were conducted. Durability studies were made for all the combinations of concrete. An efficient range of fibres was determined from the results. newline