01333255

Component

Over the past several years, engineers and researchers in pavement engineering and construction have made efforts, and continue to develop methods/procedures for accurate measurement of the surface area of mineral aggregates used in hot-mix asphalt design. The difficult part of the process has been the fact that aggregate particles have irregular and non-ideal shapes. This paper introduces the use of a three-dimensional (3D) laser scanning based approach to quantify the surface properties of mineral aggregates used in road pavements in South Africa. The laser device was successfully evaluated for precision and accuracy, and utilized to directly obtain the surface areas of mineral aggregates used in five typical South African asphalt mixtures. As an application of the laser-based measurements, the asphalt film thicknesses of the five asphalt mixtures were calculated and compared with the film thicknesses calculated from the current Hveem method. It was evident that the surface areas of aggregate particles can be determined precisely based on direct measurement from a laser scanning device, and that the methods used to compute aggregate particle surface area has significant impact on the film thickness of the asphalt mixture. Based on the 3D laser scanner results, new surface area factors were developed for coarse aggregates typically used in South African asphalt mixtures.

The DVD lists the title of this paper as: Three-Dimensional Laser-Based Measurement of Mineral Aggregate Surface Area for South African Hot-Mix Asphalt Mixtures.

01329018

11-3481

English

17p

2011

Transportation Research Board 90th Annual Meeting

DVD

Figures; Photos; References (26) ; Tables (6)

Asphalt mixtures; Hot mix asphalt; Mathematical models; Mineral aggregates; Road construction; Surface course (Pavements)

South Africa

Highways; Materials; Pavements; I33: Other Materials used in Pavement Layers

Transportation Research Board Annual Meeting 2011 Paper #11-3481

TRIS, TRB

Feb 17 2011 6:32PM