Optimizing Concrete Mixtures through Multi-Criteria Decision Making: A Focus on Splitting Tensile Strength in Partially Set Concrete

Abstract

The specific objectives of this experimentation is to investigate the splitting tensile strength of concrete subjected to partial setting with varying proportions of fly ash (20% and 25%) and 1% synthetic polypropylene fibers. The examination encompasses the assessment of workability, density, and splitting tensile strength, with the validation of results compared to earlier studies conducted at different time intervals (0, 45, 75, 100, and 180 minutes). The implementation of the Analytical Hierarchy Process assists in prioritizing the optimal parameters for the concrete mix. The findings reveal a reduction in workability and density as the time delay increases; however, there is a notable enhancement in splitting tensile strength, particularly when 1% synthetic polypropylene fibers are incorporated. Consistency in the study is evident, with an average correlation factor of 0.995 in comparison to previous research. The decision-making model highlights the 1% synthetic polypropylene fiber mix as the most suitable, especially at the 100-minute mark, with a weightage of 0.118. This model provides a practical solution to minimize wastage, conserve resources, and cut costs in construction projects affected by delays in casting.

Keywords

• partially set concrete, splitting tensile strength, polypropylene fibres, fly ash, time lag, analytical hierarchy process.