Strength Characteristics of GGBS and Fly Ash Based Geopolymer Concrete using Overburnt Bricks as Coarse aggregate

Abstract

The construction industry has grown significantly in importance as a result of meeting the needs of the world's growing population. Apart from naturally available resources such as coarse aggregate, fine aggregate, and water, cement is the most essential and artificially man-made substance utilized in the manufacture of concrete. Cement manufacture not only depletes natural resources but also emits toxic chemicals into the atmosphere, such as CO2 and NOx [R]. As a result, alternative cement binder ingredients that lower carbon footprint are required. Aside from reducing cement production by employing alternative materials, it is also necessary to investigate the availability of alternative materials that can be utilized in place of naturally accessible coarse aggregates.

Many research investigations have been launched in quest of alternative binder materials, with Geopolymer concrete (GPC) being one of them. GPC may be made by combining cementitious materials like as fly ash and Ground Granulated Blast Furness Slag (GGBS) with typical concrete production components such as coarse aggregate and fine aggregates. For binding all of the raw ingredients, an alkaline molar activator composed of NaoH and Na2SiO3 is used. The current study aims to investigate the compressive strength characteristics of GPC prepared using various GGBS to fly ash proportions (100:0, 75:25, 50:50, and 25:75), alkaline molar activators (2,4,6, and 8) and coarse aggregate to burnt brick proportions (100:0, 90:10, 80:20, 70:30, 60:40, and 50:50).

Of all 64 mix proportions, the GGBS to fly ash ratio (100:0), substitution of coarse aggregate with overburned brick (90:10) using 8M resulted in the maximum strength. All types of significant concrete works can employ this brick geopolymer concrete. In comparison to all 64 mix proportions, the replacement of coarse aggregate with overburned brick (90:10) using 8M resulted in moderate strength with a GGBS to fly ash ratio of 50:50. With respect to the various material proportions described above, the fluctuation of GPC's compressive strength is shown.