A statistical investigation of different parameters influencing compressive strength of fly ash induced geopolymer concrete

摘要

This paper statistically investigates the influence of parameter, namely curing temperature, molarity, NaOH/Na2SiO3, and activator-to-fly ash ratio on the compressive strength of low calcium fly ash-based geopolymer concrete. This paper also investigates the effect of delay time prior to curing on the compressive strength of geopolymer concrete. The results of the experimental investigation show that these parameters notably influence the development of the mechanical strength of the final product. The statistical investigation shows that the early compressive strength is significantly affected by the synergistic effect of a linear term of curing temperature, molarity, and activator-to-fly ash ratio while NaOH/Na2SiO3 ratio was found to be not so statistically significant. The numerical algorithm formulated using regression analyses were simultaneously optimized by utilizing response optimizer method. A constitutive model which represents a relationship between the compressive strength and splitting tensile strength is also proposed.