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Please use this identifier to cite or link to this item: http://hdl.handle.net/10204/6029

Title: Weak interlayers in flexible and semi-flexible road pavements: Part 1
Authors: Netterberg, F
De Beer, M
Keywords: Pavement design
Road pavements
Heavy vehicle simulator
Civil engineering
Issue Date: Apr-2012
Publisher: South African Institution of Civil Engineering
Citation: Netterberg, F and De Beer, M. 2012. Weak interlayers in flexible and semi-flexible road pavements: Part 1. Journal of the South African Institution of Civil Engineering, vol. 54(1), pp 33-42
Series/Report no.: Workflow;9344
Abstract: Weak layers, interlayers, laminations and/or interfaces in the upper structural layers of road pavements are specifically prohibited in most road-building specifications. However, such layers are extremely common and often lead to premature pavement distress. In Part 1 of this two-part set of papers, it is shown that from experience with heavy vehicle simulator (HVS) and dynamic cone penetrometer (DCP) testing, the presence of such layers and/or conditions at any depth in the structural layers of a flexible or semi-flexible pavement is far more deleterious thanis commonly appreciated. In Part 2 the effects of these weak layers are further modelled and discussed using various examples based an HVS testing and mechanistic pavement analyses. In particular, a weak upper base course of a cemented pavement under a thin bituminous surfacing may lead to severe surfacing (and upper base) failure within a matter of weeks to months after opening to traffic, not excluding failure even during construction. In this paper (Part 1), the causes of weak layers, interlayers, laminations and/or interfaces, together with simple methods for their detection during construction and analyses of their effects on the structural capacity of flexible and semi-rigid (cemented) road pavements, are briefly discussed.
Description: Copyright: 2012 South African Institution of Civil Engineering
URI: http://www.scielo.org.za/pdf/jsaice/v54n1/04.pdf
ISSN: 1021-2019
Appears in Collections:Infrastructure engineering
General science, engineering & technology

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