Statistical exploration for enlargement of reformed water cement ratio law for fly ash concrete

Year 2025, Volume: 43 Issue: 1, 269 - 281, 28.02.2025

Lomesh Mahajan Monali Kirange Sariputt Bhagat

Abstract

In the last ten years, supplementary mineral admixture (SMA) for cement substitution became gradually practical because of their pozzolanic strength and durability characteristics. A crucial
issue for SMA concrete is the strength change depending to the age of the binding ingredient. In order to preserve the pozzolanic reaction in SMA concrete, which aids in the development of strength in cementitious qualities, the time frame of water curing is crucial. In the present study, concrete specimens results from laboratories for various mix designs were evaluated, and the associated strengths were correlated with the Abrams law parameter. The Abrams law was developed for concrete having cement as binder content. Many times, this law has not workout where the alternative binder content to cement need to be used for producing concrete. In this work, statistical approaches were used to build mathematical models that relate compressive strength to many factors that impact it, such as cement content, fly ash content, fly ash to binder ratio, and water binder ratio. Variables are considered —f/cm, c, f, cm, cm/A, µ along with w/cm. The best equation after analysis is found as log (CS) = a0 + a1 (w/cm) + a2 (f/cm). These models might be helpful tools for changing Abrams laws to account for fly ash concrete. The current study effort has been focused on low to moderately strong ordinary concrete construction and the mix design process has been maintained as straightforward as possible. Fly ash was substituted for cement at 0% to 50% of the weight of the cementitious material. The water cementing substance ratios varied from 0.4 to 0.6. The amounts of cementitious materials varied for 300 kg/m3, 375 kg/m3, and 450 kg/m3. This study is focused on adoptability of 54 mixes of fly ash combinations and their utility to common practitioners. As a result, it can be concluded that the influence of cement content to the strength of fly ash concrete is greatest at the beginning of the process, diminishes as the process progresses up to 56 days, and then becomes nearly constant. Also, it can be deduced that the strength of fly ash concrete achieves almost saturation at 56-90 days, and that the increment beyond this point is negligible

Keywords

Abram Law, Cement Content; Concrete, Fly Ash, Water Cement Ratio

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