Investigating the Relationship Between Compressive Strength and Electrical Resistivity of Concretes Containing Micro Silica and Fly Ash at Early Ages

Abstract

Non-destructive testing methods can be employed to determine the properties of concrete in its early ages, providing a means to assess concrete quality and safety during construction. The main objective of this research is to estimate the compressive strength of concrete containing micro silica (5% and 10%) and fly ash (15%, 25%, and 50%) in its early ages based on electrical resistivity. Establishing a correlation between these two crucial concrete parameters allows for the calculation of concrete compressive strength without the need for destructive tests, utilizing electrical resistivity. This approach ensures damage-free test samples, allowing for consecutive testing on a specific concrete specimen. Additionally, the study investigates the impact of pozzolanic materials, micro silica, and fly ash on the electrical resistivity of concrete. To achieve this, 18 concrete mixtures were prepared with water-to-cement ratios of 0.4, 0.45, and 0.5 and a cementitious material content of 350 kilograms per cubic meter. Planned tests were conducted at 1, 3, 7, 14, and 28 days. The results indicate that concrete compressive strength can be estimated as a function of electrical resistivity in the early ages.