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Title:

The Effect of the Interaction between Bituminous Seals and their Substrates on the Performance of Road Pavements in Tropical Environments

Accession Number:

01763813

Record Type:

Component

Abstract:

The performance of pavements is governed by the characteristics of the materials of the individual pavement layers, the support provided by underlying layers, and the overall pavement strength to withstand the traffic stresses. These factors vary seasonally and in the long-term as the materials age.Bituminous seals are an expensive layer of the pavement system and thus their failure should be minimised by proper selection of the appropriate technology combination. An understanding of the mechanism by which failure is induced through the use of inappropriate combinations of seal and substrate is important to ensure longevity of the pavement. This paper examines 6 case studies to demonstrate cases where substrate failure was initiated by failure of the seal and where seal failure is initiated by changes in the substrate conditions. The effect of climatic factors such as rainfall and poor drainage, and bitumen aging are considered. Bitumen aging is severe under tropical conditions. Failure mechanisms are postulated for each of the case studies examined.As a result of the examination of these case studies, it was apparent that the choice of seal and substrate combinations play an important role in pavement performance. Historically weak seals such as sand seal performed better when laid on strong substrates/bases. WPavements comprising moisture susceptible substrates induced defects on thin seals, although seals with thicker bitumen films, such as Otta seal performed comparatively better when used on those substrates.

Supplemental Notes:

This paper was sponsored by TRB committee AKT30 Standing Committee on Pavement Maintenance.

Report/Paper Numbers:

TRBAM-21-00309

Language:

English

Corporate Authors:

Transportation Research Board

Authors:

Otto, Andrew
Cook, Jasper R

Pagination:

17p

Publication Date:

2021

Conference:

Transportation Research Board 100th Annual Meeting

Location: Washington DC, United States
Date: 2021-1-5 to 2021-1-29
Sponsors: Transportation Research Board; Transportation Research Board

Media Type:

Web

Features:

Figures; References; Tables

Subject Areas:

Highways; Materials; Pavements

Source Data:

Transportation Research Board Annual Meeting 2021 Paper #TRBAM-21-00309

Files:

TRIS, TRB, ATRI

Created Date:

Dec 23 2020 11:12AM