Wearing Coarse Aggregates: A Quality Perspective

Abstract

This research is dedicated to a thorough investigation into the quality parameters of coarse aggregates specifically allocated for the construction of road wearing courses, employing a dual approach comprehensive laboratory analysis coupled with a diligent review of prevailing industry standards. The core objectives of this investigation encompass several key areas. Firstly, to precisely identify the intrinsic physical and mechanical attributes of the coarse aggregates. Secondly, to rigorously compare these identified properties against both national and international technical specifications. Finally, to critically evaluate the tangible implications of these characteristics on the overall performance and longevity of road infrastructure. A suite of standardized laboratory tests was meticulously performed, including the aggregate crushing value (ACV), aggregate impact value (AIV), Los Angeles abrasion, specific gravity, water absorption, as well as the flakiness and elongation index tests. Each of these procedures strictly adhered to the established methodologies outlined in pertinent British Standards (BS) and American Society for Testing and Materials (ASTM) codes. Furthermore, this study delves into the serious repercussions associated with utilizing substandard aggregates. These implications range from a significantly reduced pavement lifespan and escalated maintenance expenditures to a compromised level of road safety for users. To mitigate these risks, several key recommendations are put forth aimed at enhancing material selection protocols. Ultimately, this research makes a valuable contribution to the broader ambition of elevating the standard of road infrastructure quality by highlighting the paramount importance of aggregate quality within construction practices.