The addition of a small amount of cementitious binder to non-standard granular materials may result in a fit for purpose base or subbase at a .. Read more significantly lower cost than crushed rock complying with standard specifications. Such lightly bound cemented (LBC) materials have particular use in pavement rehabilitation and heavy patching as they are less susceptible to block cracking and crocodile cracking than cemented materials. The binder content and strength of LBC materials are significantly lower than heavily bound cemented (HBC) materials. Austroads’ recent report, which reviewed the performance of selected Queensland pavements with LBC bases, has shown that it is possible to design and construct a low-strength material with base thickness and subbase support sufficient to limit the extent of the micro cracking development that leads to macro-cracking. Dr James Grenfell is a Principal Professional at Australian Road Research Board (ARRB). Much of his work has focused on Austroads projects, including looking at improving the knowledge of foamed bitumen stabilised pavements and the use of lightly cemented materials in pavement construction. James has a BEng degree and a PhD in Materials Engineering and has more than 16 years’ experience working on various projects related to pavement materials both in Australia and the UK.
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