OPTIMIZATION OF THE USE OF FLY ASH IN PRECAST CONCRETE FOR RIGID PAVEMENT AND ITS RELATIONSHIP WITH CO2 EMISSIONS

The results of testing in the laboratory at the age of 28 days with variations of Fly ash Substitution of 0%, 5%, 10%, 15%, and 20%. From the results of polynomial regression analysis on environmentally friendly precast concrete for rigid pavement applications, the optimum compressive strength is 36.35 MPa, the optimum split tensile strength is 3.96 MPa and the optimum flexural strength is 4.17 MPa with an optimum fly ash content of 13.3 %. The results of the analysis of the relationship between compressive strength and flexural strength using exponential regression analysis found that precast concrete with the use of fly ash can be applied to rigid pavements (fr = 4.17 Mpa). From the optimization results in this study, the optimum fly ash content was obtained at 13.3% with a maximum compressive strength of 36.35 MPa, so that in 1 m3 of concrete mixture it can reduce the amount of cement by 76.79 kg and at the same time reduce CO2 emissions by 162.79 Kg. CO