Eefect of Limestone Ash on Properties of High-Early Strength Concrete

Abstract

This article outlines the experimental studies on using limestone ash , by product from limeindustry, as a new addition in concrete work. Limestone ash is generally a powder material with 204micrometer in average particle diameter and has principal oxide composition of 59.33 % CaO. Testsof high-early strength concrete were carried out not only on ordinary portland cement concrete butalso Mae Moh fly ash concrete containing 30 % fly ash replacement. Water to binder ratio wascontrolled at 0.40 while percentages of limestone ash were varied from 0, 10, 20, 30 to 50 by weightof fine aggregate. Strength development of concrete was relatively investigated at ages of 1, 2, 3, 7and 28 days. Furthermore, durability properties such as drying shrinkage, carbonation depth as wellas sulfate resistance and chloride penetration were studied. From test results, it was derived that10 % and 20 % limestone ash can be applied as the potential addition for accelerating early strengthof concrete while maintaining 28-days compressive strength.