Crack initiation and development in AC layers

• Autorzy: Norrison H.
• Języki publikacji: EN

Abstrakty

EN

An investigation of sub-surface cracks was carried out on Asphaltic Concrete (AC) samples extracted from pavements of various ages, using the Scanning Electron Microscope (SEM). SEM images, of the AC fabric, at 150 times magnification, revealed that the greater majority of nano- and micro-cracks occur along the grain boundary regions between the mineral aggregate and bituminous binder as well as in the binder itself. Analysis of the data obtained from these examinations suggests that these fractures propagate throughout the AC fabric in accordance to linear functions. Also, the composite structure of AC fabric contains many imperfections within its matrix and also within each individual material used in the mix. These flaws support crack growth and further contribute to the deterioration of the fabric and pavement structure. The theory relating to crack initiation in AC layers is addressed in this paper.

Słowa kluczowe

EN

crack; sub-surface cracks; microcracks; nano-cracks; crack propagation; crack growth

• Wydawca: Wydawnictwo Politechniki Poznańskiej
• Czasopismo: Foundations of Civil and Environmental Engineering
• Rocznik: 2007
• Tom: No. 9
• Strony: 105--115
• Opis fizyczny: Bibliogr. 4 poz.

Twórcy

autor

Norrison H.

• Victoria University, Melbourne - Australia Tel.: [phone]; fax: [phone],

Bibliografia

• 1. Callistcr W.D. (Jr), Materials Science and Engineering - Ań Introduction 5th Edition, USA, John Wiley & SONS, Inc. 1999
• 2. Norrison H., McManus, K.J., "Modelling of Crack Initiation and Growth in Flexible Pavements for Urban Local Roads. Proceedings, Book l, Sessions 1&4 2nd Eurasphalt & Eurobitume Congress, Barcelona, Spain (2000),
• 3. Paterson, W.D.O., "Road Deterioration and Maintenance Effects" Model for Planning and Management. The Highway Design and Maintenance Standard Series, (1987),
• 4. Norrison H., Holden J., McManus K. and Brinkies H. "Is it possible to pre-vent the occurrence of cracking in thin AC pavements?" 8-th International conference - on Durable and Safe Road Pavements" Road & Bridge Research Institute, Warsaw, Poland, (2002)