Determining if a relationship can be established to control the thickness of an asphalt layer by density

Abstract

Asphalt contractors are given a set of specifications to adhere to when constructing asphalt layers. This includes the specification of thickness layers where the minimum and maximum tolerances are defined. However, the estimation of what loose layer thickness a contractor should commence with is left to the contractor.

Traditionally compaction factors are used to guide the construction of an asphalt layer, from loose volume, to meet both compacted thickness and density. These factors have thus far been mostly empirical, with a high degree of personal bias. It can, however, be seen that the technical characteristics of the mix, as well as environmental and mix temperatures, play key roles when combined with the mechanics of the construction process to achieve the specified layer or lift thickness.

This study endeavours to delve into these variables and more, with a view to recommending a standardized, practical, and scientific approach to determining compaction “factors” for constructing asphalt layers using currently available mixes and equipment in South Africa.

About the author

Craig Naicker graduated from the University of KwaZulu Natal with a B.Sc. Hons Degree in Mathematics and Statistics in 2007. Before starting his own company, he worked on numerous finance projects in the banking industry where he gained experience in project coordination, financial modelling, as well as designing and implementing an outcome-based remuneration (OBR) project. The OBR project was recognised by the South African Remuneration Association as a leading productivity tool to drive employee motivation.
Craig established Ten Logistics and Civils in 2008 and went on to obtain his MBA at the North-West University. Ten Logistics and Civils has grown into one of the leading asphalt contracting companies in KwaZulu-Natal, with clients such as ACSA, SANRAL and many local municipalities.
A commitment to excellence and professionalism, along with a deep-rooted connection to the KZN region, has enabled Craig to become a well-recognised and respected name in asphalt contracting.