Effect of Geopolymer (Hypo sludge) on Concrete: A Review

Abstract

Next to water, Concrete is the world’s most versatile, durable and reliable construction material. The
production of ordinary Portland cement contributes 5-7% of total greenhouse gas emission. Hence it is essential to
find the alternative to cement. The use of Geopolymer concrete as an alternative material over Portland cement
concrete to reduce the adverse effects on the environment is investigated in this paper. Geopolymer is a material
resulting from the reaction of a source material that is rich in silica and alumina with alkaline solution. Hypo sludge
is the by product that can use in place of cement this is also rich in silica and alumina. In Geopolymer hypo sludge
and silica fume acts as binder and alkaline solution acts as an activator. Alkaline solution used for present study is
Sodium Hydroxide (NaOH). The mixes were designed for molarity of 5M, 10M and 15M. The tests were carried out to
evaluate the mechanical properties like slump test, compressive strength, and flexural test and split tensile strength
after 7 and 28 days.