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Asphalt mix design for cape town international airport using scaled apt and other selected tests



Title: Asphalt mix design for cape town international airport using scaled apt and other selected tests
Author(s): K. J. Jenkins, F. J. Pretorius, F. Hugo, R. Carr
Paper category : conference
Book title: Sixth International RILEM Symposium on Performance Testing and Evaluation of Bituminous Materials
Editor(s): M. N. Partl
Print-ISBN: 2-912143-35-7
e-ISBN: 2912143772
Publisher: RILEM Publications SARL
Publication year: 2003
Pages: 573 - 579
Total Pages: 7
Nb references: 3
Language: English


Abstract: The main taxiways at Cape Town International Airport were identified through regular maintenance surveillance, as being in urgent need of rehabilitation. Thick asphalt base layers were identified as the most cost-effective and applicable pavement rehabilitation structure. The aggressive wheel loading and environmental conditions necessitated a superior asphalt design methodology for these mixes. A special design approach was followed that first identified the mechanistic and functional needs of each asphalt zone / layer. Applicable asphalt mixes were identified and specified accordingly, based on local knowledge and fundamental mix design principles. Due to the extremely high tyre pressures of the aircraft wheels i.e.1200kPa, special emphasis was placed on deformation resistance during testing. The Model Mobile Load Simulator (MMLS Mk3), a scaled-down accelerated pavement testing (APT) tool with one-third scale wheels, was commissioned to evaluate the candidate mixes. Due to its prior calibration with full-scale APT, the MMLS3 has enabled quantitative results to be obtained for predicted rutting at high temperature and durability under wet trafficking. Other selected tests were also performed. Based on the results from this comprehensive study, optimum mixes were identified, fine-tuned and verified for each of the asphalt layers (wearing course, upper base and lower base). The approved production mixes were tailor-designed for each unique structural and functional pavement need that they had to fulfil.


Online publication: 2003-03-02
Publication type : full_text
Public price (Euros): 0.00
doi: 10.1617/2912143772.072