Split Tensile Strength and Workability Characteristics of GGBS, Fly Ash, Over Burnt Bricks based Geo-Polymer Concrete

Abstract

Carbon dioxide (CO2) pollutants are mostly caused by the manufacturing of cement. The environmentally friendly and inventive geopolymer concrete (GPC) replaces conventional Portland cement-based concrete. This is acquisition consideration in the construction manufacturing due to its potential environmental benefits and advantageous material properties.  Two crucial factors in structural design are the concrete's Splitting tensile strength (f_spt) and compressive strength (f_c). A simple yet precise method of predicting the value of this characteristics is something that many academics are interested in because tensile testing are difficult, expensive and time-consuming to do. Instead of employing Portland cement as the binder material, a geopolymer (GP) binder is used to create GPC. Usually, an alkaline activator liquid is used to activate aluminosilicate source materials such fly ash, slag, or natural clay in order to form the GP binder.  These source materials are rich in silica (SiO₂) and alumina (Al₂O₃) it react with the activator to form a solid binder through a process called geopolymerization. The goal of the present study is to understand better the split tensile workability features of GPC, which is produced by varying the quantities of GGBS to fly ash (4 No's), alkali molar activators (4 No's), and coarse aggregate to over burnt brick (6 No's). The variation of Split tensile strength and workability of GPC with different material proportions mentioned above is presented.  The workability trended worse as the overburnt brick content increased, according to the test results. The molarity changes with workability. Sufficient outcomes are maintained for all mix proportions within the 50-115mm range of workability. The workability decreases as the molarity rises; workability rises when molarity falls. It also matters what kind of binder is used in place of the workability. Workability will change based on the binder's content. Furthermore, when over burned bricks expand and are replace by aggregate in the percentages of 10 percent, 20 percent, 30 percent, 40 percent, and 50 percent, workability decreases at that point.     In this study replacing up to 20% of the over burned bricks produced satisfactory workability outcomes.