01661499

Component

Aggregate shape, texture, and angularity are important physical properties for the development of high quality adhesive systems with asphalt binder, and a good quality aggregate skeleton in asphalt and concrete mixtures. These properties are commonly measured using systems that employ images of aggregate samples taken with a digital camera, such as the second generation Aggregate Image Measurement System (AIMS2). In practice, macrotexture measurements are commonly conducted nondestructively at highway speed using high-frequency lasers on in-service pavements. In addition, lasers are used to characterize the macrotexture of specimens compacted in the laboratory or taken from field sections. Indeed, specifications used in practice to measure macrotexture are based on laser measurements. Therefore, there is a need to investigate the application of these optical sensors for measuring aggregate texture in the laboratory. This paper presents development work on use of lasers an alternative method for laboratory characterization of aggregate microtexture. Microtexture statistics determined from laser measurements on different aggregates are compared with corresponding texture indices obtained from AIMS2 to evaluate the laser measurements and identify where further improvements in characterizing aggregate microtexture can be made.

This paper was sponsored by TRB committee AFP70 Standing Committee on Aggregates.

18-03359

English

0000-0002-1435-3662

6p

2018

Transportation Research Board 97th Annual Meeting

Digital/other

Figures; References

Coarse aggregates; Lasers; Optical detectors; Visual texture recognition

Highways; Materials; Pavements

Transportation Research Board Annual Meeting 2018 Paper #18-03359

TRIS, TRB, ATRI

Jan 8 2018 10:49AM