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Development of compression pull-off test (CPOT) to assess bond strength of bitumen

Rahim, Abdur; Thom, Nick; Airey, Gordon


Abdur Rahim

Assistant Professor

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Professor of Pavement Engineering Materials


The quantification of moisture susceptibility has been a major concern for researchers as it adversely affects the performance of asphalt pavements. Several methods have been developed to assess bond strength using asphalt mixtures in loose and compacted state. These tests lack in their ability to study fundamental properties that affect the bond between bitumen and aggregate. In this context, more fundamental techniques have been developed such as pull-off stub tests and direct tension tests. The first group only measures the maximum pull-off strength and second group has problems related to use of consistent binder film thickness and operational difficulties in test itself.

This paper presents a new test to evaluate bond strength, in an attempt, to solve problems associated with traditional direct tension tests. The aim is achieved through a review of existing techniques, development of a gap assembly, fabrication of direct tension test moulds, development of Compression Pull-Off Test (CPOT) and evaluation of its results. The key parameters for bitumen and mastics were evaluated. The CPOT shows promising results for use of this technique to study cohesive as well as adhesive bond strength of binder.


Rahim, A., Thom, N., & Airey, G. (2019). Development of compression pull-off test (CPOT) to assess bond strength of bitumen. Construction and Building Materials, 207, 412-421.

Journal Article Type Article
Acceptance Date Feb 15, 2019
Online Publication Date Feb 27, 2019
Publication Date May 20, 2019
Deposit Date Apr 12, 2019
Publicly Available Date Feb 28, 2020
Journal Construction and Building Materials
Print ISSN 0950-0618
Electronic ISSN 1879-0526
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 207
Pages 412-421
Keywords Pull-off test; Bitumen; Adhesion; Cohesion; Bond strength; Tensile strength; Moisture damage; Compression pull-off test; Test development
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Additional Information This article is maintained by: Elsevier; Article Title: Development of compression pull-off test (CPOT) to assess bond strength of bitumen; Journal Title: Construction and Building Materials; CrossRef DOI link to publisher maintained version:; Content Type: article; Copyright: © 2019 Elsevier Ltd. All rights reserved.


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