Inspire : Public Works July Aug 2013
32 Public Works Professional July-August 2013 In collaboration with 236 road agencies throughout the country, the ARRB Group has developed the rst national Australian local road deterioration models. The models re ect the ndings of a long-term monitoring program covering more than 500 sealed and 100 unsealed local road sites in various tra c and climatic environments across Australia. "For the rst time, asset managers now have access to a range of evidence-based deterioration models to assist in making decisions for local roads," says Dr Tim Martin, ARRB's Chief Scientist. Martin will elaborate on the study at the IPWEA National Conference in Darwin in August. ESTIMATE FUTURE CONDITIONS The study, which took almost 10 years to complete, enables asset managers to install the models in a pavement management system (PMS) for local roads to estimate future road conditions and budget accordingly for maintenance requirements at a network level. "A study of this size and scope, covering such a wide range of conditions over an extended period, has never been undertaken before in Australia or overseas," said Martin. Selected sealed roads were monitored three times over ve years, while unsealed roads were monitored every two months over the course of one year. SHARING INFORMATION Informed decisions on road maintenance hinge on having good information at the outset. That information is now a lot closer to hand, thanks to Australia’s frst national study on the deterioration of local roads. The study provided a set of road deterioration models relating to gravel loss, roughness and shape loss in the case of unsealed roads, and roughness, rutting, cracking and remaining road life strength in the case of sealed roads. FURTHER STUDIES The models have since been implemented for maintenance planning by Moorabool Shire Council (MSC) in central Victoria. MSC is also working with ARRB on a further two-year study into the performance of a large sample of unsealed local roads in the MSC network. MSC and ARRB will collect the performance data along with quantifying the other variables in uencing performance, including tra c and maintenance practices. The resulting models predicting the impact of maintenance practices will be made widely available to local government via knowledge transfer by ARRB to assist in the asset management capability of unsealed roads. These models are expected to be adaptable to the varying local conditions of other unsealed roads in other locations. Meanwhile, a new local roads project involving 10 continuous sections, each 300m long, commenced a year ago on a straight stretch of unsealed road south of Kerang in northern Victoria's Gannawarra Shire. The aim of this study is to examine the performance of 10 combinations of di erent pavement base and surfacing treatments. ••• NEW STUDY SHEDS LIGHT ON ROAD DETERIORATION This road at Red Rock Lookout near Colac, Victoria, is one of hundreds monitored.
Public Works May Jun 2013
Public Works Professional Sept - Oct 2013