Abstract
The impact of different parameters on the compressive strength of geopolymer synthesized from clay and bagasse bottom ash is reported. Geopolymer was synthesized from thermally activated clay and bottom bagasse ash using sodium silicate and sodium hydroxide as activator. The maximum dissolution of alumina and silica from the bagasse ash and clay maintaining different alkali conditions is studied. The resulting geopolymer synthesized under different conditions is studied for compressive strength. Different characterizations of the resulting geopolymer were carried out using different analytical instruments. The results indicated that the dissolution and strength of geopolymer have close relationships with the alkali concentration, solution to solid ratio and curing period. The highest compressive strength of 25 MPa was observed for 8M NaOH, 24 MPa for 0.3 solution to solid ratio, 30 MPa for 60% clay and 30 MPa for 27 days of compressive strength.
Highlights
Geopolymers are three dimensional inorganic polymers with amorphous and some semi amorphous phases, having Si-O-Al linkage synthesized for the first time by JosephDavidovit 1982
The mechanism of dissolution, strength development of geopolymer, and microstructural and mineralogical studies are studied and reported. Both of the raw materials such as bagasse ash and clay are abundantly available with no price and their conversion to geopolymer in mixed form is a novel work
The mineralogical and structural study of the raw materials and synthesized geopolymer was made by an X-ray Diffractometer (XRD) with Cu Ka radiation at 40 mA and 40 kV
Summary
Geopolymers are three dimensional inorganic polymers with amorphous and some semi amorphous phases, having Si-O-Al linkage synthesized for the first time by Joseph. Geopolymer mortar and concrete has been synthesized by activating clay having high calcium with a mixture containing 15M sodium silicate and hydroxide [12], and 54.4 MPa strength was achieved at the curing period of 28. Various parameters for the preparation of slag-based geopolymer, including alkali/slag, water/geopolymer, alkaline/water were studied for the development of maximum compressive strength [13] He concluded that for excellent strength, concentration of alkali, composition of sodium silicate, ratio of silicate to hydroxide, temperature and curing time are the essential factors. The mechanism of dissolution, strength development of geopolymer, and microstructural and mineralogical studies are studied and reported Both of the raw materials such as bagasse ash and clay are abundantly available with no price and their conversion to geopolymer in mixed form is a novel work. The resulting geopolymer is a good alternative for the Portland cement in many applications such as construction material etc
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