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Fracture testing for the evaluation of asphalt pavement joints
KTH, School of Architecture and the Built Environment (ABE), Transport Science, Highway and Railway Engineering.ORCID iD: 0000-0002-5526-5896
KTH, School of Architecture and the Built Environment (ABE), Transport Science, Highway and Railway Engineering.
KTH, School of Architecture and the Built Environment (ABE), Transport Science, Highway and Railway Engineering.
2013 (English)In: International Journal on Road Materials and Pavement Design, ISSN 1468-0629, E-ISSN 2164-7402, Vol. 14, no 4, p. 764-791Article in journal (Refereed) Published
Abstract [en]

Asphalt joints are inevitable parts of every pavement. Although much attention is dedicated to the construction of such joints, reliable tools for assessing the mechanical properties of joints for design and performance assessment are still scarce. This is particularly true for cold joints when attaching a new hot pavement to a cold existing pavement as in the case of large patches for pavement repair. This paper intends to evaluate different new or modified static fracture testing methods for ranking existing joint construction techniques. Some of these testing methods, such as indirect tensile test, direct tensile test and 4-point bending test are familiar in the field of asphalt pavement characterisation, but have scarcely been used for assessing the quality of joints so far. These three test types were adopted and evaluated for joints and the test results were analysed with finite element (FE) software ABAQUS. Different joints for testing were prepared in the laboratory using a special specimen construction procedure. The results suggest that joints with inclined interfaces seem to show more promising behaviour than vertical joints. It was confirmed that starting compaction from the hot side of the joint generally produces better results than compaction starting from the cold side of the joint. Pre-heating of the joint surface and using a bond sealant appears to provide the best results.

Place, publisher, year, edition, pages
2013. Vol. 14, no 4, p. 764-791
Keywords [en]
cold asphalt pavement joints, asphalt joint laboratory production, IDT joint evaluation, DTT joint evaluation, 4PB joint evaluation, joints FE analysis
National Category
Infrastructure Engineering
Research subject
SRA - Transport
Identifiers
URN: urn:nbn:se:kth:diva-134179DOI: 10.1080/14680629.2013.812979ISI: 000330015900002Scopus ID: 2-s2.0-84888129020OAI: oai:DiVA.org:kth-134179DiVA, id: diva2:665060
Note

QC 20140122

Available from: 2013-11-18 Created: 2013-11-18 Last updated: 2017-12-06Bibliographically approved
In thesis
1. Investigation of asphalt compaction in vision of improving asphalt pavements
Open this publication in new window or tab >>Investigation of asphalt compaction in vision of improving asphalt pavements
2015 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

Asphalt joints are potentially weakest parts of every pavement. Despite of their importance, reliable tools for measuring their mechanical properties for design and performance assessments are still scarce. This is particularly true for cold joints when attaching a new hot pavement to a cold existing one as in case of large patches for pavement repair. In this study, three static fracture testing methods, i.e. indirect tensile test (IDT), direct tension test (DTT) and 4 point bending (4PB), were adapted and used for evaluating different laboratory made joints. The results suggested that joints with inclined interfaces and also the ones with combined interface treatments (preheated and sealed) seemed to show more promising behaviors than the vertical and untreated joints. It was also confirmed that compacting from the hot side towards the joint improved the joint properties due to imposing a different flow pattern as compared to the frequent compaction methods. The latter finding highlighted the importance of asphalt particle rearrangements and flow during the compaction phase as a very little known subject in asphalt industry. Studies on compaction are of special practical importance since they may also contribute to reducing the possibility of over-compaction and aggregate crushing.

Therefore, in this study, a new test method, i.e. Flow Test (FT), was developed to simulate the material flow during compaction. Initially, asphalt materials were substituted by geometrically simple model materials to lower the level of complexity for checking the feasibility of the test method as well as modeling purposes. X-ray radiography images were also used for capturing the flow patterns during the test. Results of the FT on model materials showed the capability of the test method to clearly distinguish between specimens with different characteristics. In addition, a simple discrete element model was applied for a better understanding of the test results as a basis for further improvements when studying real mixtures. Then, real mixtures were prepared and tested under the same FT configuration and the results were found to support the findings from the feasibility tests. The test method also showed its potential for capturing flow pattern differences among different mixtures even without using the X-ray. Therefore, the FT was improved as an attempt towards developing a systematic workability test method focusing on the flow of particles at early stages of compaction and was called the Compaction Flow Test (CFT).

The CFT was used for testing mixtures with different characteristics to identify the parameters with highest impact on the asphalt particle movements under compaction forces. X-ray investigations during the CFT underlined the reliability of the CFT results. In addition, simple discrete element models were successfully generated to justify some of the CFT results.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2015. p. xiv, 23
Series
TRITA-BYMA, ISSN 0349-5752 ; 2015:5
Keywords
Cold asphalt pavement joints, asphalt joint laboratory production, IDT joint evaluation, DTT joint evaluation, 4PB joint evaluation, joints FEM analysis. Discrete Element Modeling (DEM), X-ray Computed Tomography (CT), Compaction Flow Test (CFT), Compactability
National Category
Civil Engineering
Identifiers
urn:nbn:se:kth:diva-176319 (URN)
Presentation
2015-11-24, B3, Brinellvägen 23, Stockholm, 13:00 (English)
Opponent
Supervisors
Note

QC 20151104

Available from: 2015-11-04 Created: 2015-11-03 Last updated: 2015-11-04Bibliographically approved

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