Effect of Fibers and Matrix Related Parameters on Workability and Compressive Strength


Muhammad Zahid,Nasir Shafiq,Muhammad Ali,Mohd Fadhil Nuruddin,Asif Jalal,




Geopolymer, ,Fly Ash,Polyvinyl Alcohol (PVA) Fibers,Compressive Strength,Workability,


Geopolymer (GP) is a new generation of binder material in construction industry. Production of ordinary Portland cement (OPC) utilizes extensive energy as well as it emits large amount of CO2 into the atmosphere when compared to GP production. This paper focuses on the effect of polyvinyl alcohol (PVA) fibers, sand/fly ash and water/ geopolymer solids ratios on the workability and compressive strength of fly ash based geopolymer composite. Curing temperature, NaOH molarity and Na2Sio3/NaOH were kept as 60ᵒC, 8M and 2.5 respectively. Total of 2% (v/v) PVA fibers with cut length of 8mm and diameter of 0.04mm were utilized. Furthermore, sand/fly ash and water/ geopolymer solids (W/GP) ratios were varied in a range of 0-0.8 and 0.22-0.26 respectively. Results were evaluated with the help of response surface methodology. Reduction in workability was observed with the addition of fibers in matrix. Moreover, increase in sand/fly ash ratio caused decrease in workability and vice versa for the increase in water/ geopolymer solids ratio. Furthermore, Inclusion of fibers did not show considerable change in the compressive strength of geopolymer, however, when the workability of the matrix mixture kept relatively low, abrupt decrease in the compressive strength was observed with the addition of fibers. Increase in the sand/fly ash ratio contributes in the compressive strength up-to a certain limit. Additionally, increase in the W/GP solids ratio caused reduction in the compressive strength. Finally, multi-objective optimization technique revealed that the mix having W/GP solid =0.228848, and Sand/Fly ash =0.120947 would give optimized value.


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