EXPERIMENTAL STUDY ON PROPERTIES OF BOTTOM ASH - GGBS GEOPOLYMER CONCRETE FOR PAVER BLOCKS

Abstract

The production of cement results in emission of many green house gases in atmosphere, which are responsible
for global warming. Hence, the researchers are currently focussed on use of waste material having cementing
properties, which can be added in concrete as partial replacement of cement, without compromising on its strength and
durability. This will result in decrease of cement production thus reduction in emission in green house gases, in addition
to sustainable management of the waste. Accordingly, geopolymer concrete is emerged as an innovative concrete which
results from the reaction of source materials rich in silica alumina with alkaline liquid. In the present study bottom ash
and GGBS based geopolymer was used as the source material to produce geopolymer concrete for paver blocks. The
alkaline liquid used in geopolymerisation was the combination of sodium hydroxide (NaOH) and sodium silicate
(Na2SiO3). An attempt was made to identify the suitable combination of mix for M30 and M35 grade paver block from
BA-GGBS blend geopolymer. In the source material 75% BA and 25% GGBS was selected. The ratio of Na2SiO3 to
NaOH is chosen as 2.5. From the test result it was observed that compressive strength of M30 and M35 grade was
achieved at early ages under ambient curing.