Studying the effect of using quarries wastes in Bani-Walid as a partial substitute for fine aggregate on the compressive strength of concrete

Abstract

This research studies the extent to which the product of lime brick production waste in Bani Walid affects the compressive strength of concrete if it is used as a partial substitute for sand. Lime brick dust is a powdery substance from the product of lime brick waste. It is usually used in many applications. Lime brick dust mainly consists of Of calcium oxides, silicon oxide, magnesium oxide and aluminium.

Given the urgent need to use concrete in implementing some modern construction projects, the main objective of the research is to present a laboratory study on adding lime brick powder available in the city of Bani Walid (Al-Mardoum Quarry).

To achieve the goal of this study, 36 cubes of six mixtures were made, knowing that the mixing ratios are fixed and the only variable is the percentage of lime brick dust powder, which was used as a partial substitute for sand. The first sample was (C1- 0%), the second sample was (C2- 5%), and the third sample was (C3- 10%), the fourth sample (C4- 25%), the fifth sample (C5- 50%), and the sixth sample (C6- 100%), and then mixed and processed in laboratory conditions by immersing it in water for 7 and 28 days, where a drop test was performed on all samples and a compression test was also performed on all samples at the end of 7 and 28 days.

It was concluded through these tests that the slump value decreases when the amount of brick dust increases, and that the pressure values increased at (C2- 5%), (C3- 10%), and (C4- 25%), and the highest compressive strength value was at (C4- 25%). At (C5- 50%) it began to decrease, and the lowest compressive strength was at (C6- 100%).