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Title: Mechanical behaviour of stress absorbing membrane interlayers
Author: Ogundipe, Olumide Moses
ISNI:       0000 0004 2726 038X
Awarding Body: University of Nottingham
Current Institution: University of Nottingham
Date of Award: 2012
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This study assesses the contribution of some selected stress absorbing membrane interlayers (SAMIs) on overlaid pavement performance in delaying the offset of reflective cracking using laboratory and full scale testing. Materials characterization were carried to have knowledge of the properties of the SAMIs and overlay and some of the properties were required as input for the finite element modelling. The characterization tests include the particle size distribution, penetration and softening point tests, dynamic mechanical analysis, indirect tensile stiffness modulus test (ITSM), indirect tensile fatigue test (ITFT) and repeated load axial test (RLAT). The interface bond was investigated using the Leutner shear test and pull off test. The assessment of the contribution of selected SAMIs on overlaid pavement performance in delaying offset of reflective cracking was carried out using a wheel tracking test supported by finite element modelling, a large scale pavement test facility test and a thermal cycling test. The Leutner shear test and pull-off test were used to examine the strength and stiffness of the overlay-SAMI interface. The interface strength/stiffness was determined because it is one of the factors that influence the crack resistance of SAMIs. The wheel tracking test was carried out to evaluate the effects of the thickness and stiffness of SAMI, thickness of overlay, SAMI composition, interface stiffness, load level and temperature on the performance of SAMIs under traffic loading. To study the performance of SAMIs under conditions close to the field, a large pavement test facility test was carried out. The finite element analysis of the wheel tracking test was carried out to evaluate the deflection, stress and strain distribution in a cracked pavement with and without SAMIs. The performance of SAMIs under thermal loading (temperature variation) was investigated using the thermal cycling test. The study shows that SAMI composition, SAMI thickness and stiffness, overlay thickness, interface stiffness, temperature and load levels influence the performance of SAMIs under traffic loading. It also demonstrates that the main factor that influences the performance of SAMIs under thermal loading is the interface stiffness. Design guidelines for the successful use of SAMIs against reflective cracking were prepared and the OLCRACK software was used to demonstrate the benefits of SAMIs in an overlay over a cracked pavement.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available
Keywords: TE Highway engineering. Roads and pavements