Failure of a cape seal in Karoo conditions and rehabilitation thereof
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Date
Authors
Prinsloo, M.
Coetsee, J.S.
Potgieter, C.J.
Journal Title
Journal ISSN
Volume Title
Publisher
SATC
Abstract
Paper presented at the 21st Annual South African Transport Conference 15 - 18 July 2002 "Towards building capacity and accelerating delivery", CSIR International Convention Centre, Pretoria, South Africa.
This paper reports on the investigation by Messrs Potgieter, Hattingh & Raspi into the structural and functional condition of National route N1-11 between Hanover and Colesberg. This section of road is situated in the Karoo semi-desert region where summer and winter temperatures are extreme and the Weinert-N volume is above 10. The existing pavement was found to be structurally adequate with sufficient structural capacity for the next 10 – 15 years. However, the functional aspects of smoothing of the surface have deteriorated to unacceptable levels. The smoothing of the surfacing was found too severe and extensive. Over 88 % of the length of the old Cape Seal surfacing were smooth and bleeding. Aquaplaning and skidding because of substandard macro and micro surface texture depth has become a real problem. This deficiency of the road was classified as a surface only problem, normally rectified through the construction of a reseal. Several reseal designs were performed and the best product selected. This paper discusses the failure mechanism, design models as well as the construction of the reseal.
This paper reports on the investigation by Messrs Potgieter, Hattingh & Raspi into the structural and functional condition of National route N1-11 between Hanover and Colesberg. This section of road is situated in the Karoo semi-desert region where summer and winter temperatures are extreme and the Weinert-N volume is above 10. The existing pavement was found to be structurally adequate with sufficient structural capacity for the next 10 – 15 years. However, the functional aspects of smoothing of the surface have deteriorated to unacceptable levels. The smoothing of the surfacing was found too severe and extensive. Over 88 % of the length of the old Cape Seal surfacing were smooth and bleeding. Aquaplaning and skidding because of substandard macro and micro surface texture depth has become a real problem. This deficiency of the road was classified as a surface only problem, normally rectified through the construction of a reseal. Several reseal designs were performed and the best product selected. This paper discusses the failure mechanism, design models as well as the construction of the reseal.
Description
This paper was transferred from the original CD ROM created for this conference. The material on the CD ROM was published using Adobe Acrobat technology. The original CD ROM was produced by Document Transformation Technologies Postal Address: PO Box 560 Irene 0062 South Africa. Tel.: +27 12 667 2074 Fax: +27 12 667 2766 E-mail: doctech@doctech.co.za URL: http://www.doctech.co.za
Keywords
National route N1-11, Pavement surface, Cape Seal surfacing, Reseal designs
Sustainable Development Goals
Citation
Prinsloo, M, Coetsee, JS & Potgieter, CJ 2002, 'Failure of a cape seal in Karoo conditions and rehabilitation thereof', Paper presented to the 21st Annual South African Transport Conference, South Africa, 15 - 18 July.