Sustainable Construction Material under Cyclic Freezing-Thawing in High Saline Exposure Dutta Debabrata1,*, Ghosh Somnath2 1Research Scholar, Department of Civil Engineering, Jadavpur University, 188, Raja S.C. Mallick Road, Kolkata-700032, India 2Professor, Department of Civil Engineering, Jadavpur University, 188, Raja S.C. Mallick Rd, Kolkata-700032, India *ddebabrata83@gmail.com
Online published on 3 December, 2019. Abstract Freezing-thawing of various materials submerged in saline water was tested for one year. The experiment was done by a freezer where the individual specimen was submerged in 20% concentrated Magnesium Sulphate solution. It is already developed that fly ash geopolymer products show better strength and durability in compare to conventional cement product. This paper is further focused to the long-term durability of fly ash geopolymer with the incorporation of another postindustrial recycled material like blast furnace slag as supplement. The outcome of the research is that the drop of compressive strength on BGP (Blended Geopolymer) specimens are remarkably less compare to OGP (Ordinary Geopolymer) specimens. The important result was that alternative freezing and thawing did not affect much on strength of BGP specimens but had a considerable effect on strength of OGP specimens. Basically the reason for such a behavior is that the structure of OGP is unable to resist the tension caused by freezing of pore water due to volumetric increment. But for BGP the amount of water present in the pore is very less. Thus, more water confined inside the OGP causes cracking which allows more water absorption after every freezing – thawing cycle. Top Keywords Fly ash, blast furnace slag, Geopolymer, freezing – thawing, durability. Top |