What Happens When the Fly Ash Runs Out? Bruce Perry1 1 National Customer Technical Support Manager, Cement Australia ABSTRACT For many years, the replacement of cement with fly ash in pavement concrete mixes has been mandated by infrastructure asset owners. In NSW, R82 requires a minimum 40% replacement level whereas...
A Review of International Practices for Design of Rigid Pavements for International Container Terminals
Whilst the practice of pavement thickness design for heavy duty rigid pavements, such as highways, is well established in Europe, the USA and Australia, agreed methodologies for the thickness design of extremely heavy-duty pavements such as those in intermodal container terminals/ports (ICT) is not commonplace. ICT facilities present a number...
2021 A Subbase Odyssey
The subbase layer has a critical role in the design of concrete pavements. Australia is unique in its routine application of a lean mix concrete subbase layer to much of the heavy-duty concrete pavement highway network, the result of which is a reluctance to adopt any alternative (why fix what...
Specifying Concrete Pavement for Local Government
This presentation will provide an overview of the AUS-SPEC information, tools, technical specification templates, specifications framework and processes to document requirements for various asset life cycle activities. It will also demonstrate the use of the system to create contract documentation for the design, construction, and maintenance of local government infrastructure...
32mm Aggregate Trial at Oxley to Kundabung Pacific Highway Upgrade
This paper focuses on the analysis of pavement sensor data collected from the 32mm aggregate trial at Oxley to Kundabung Pacific Highway Upgrade project. This trial was intended to establish the concrete mix design parameters, verify the paving ability of the mix and to observe the environmental loading behaviour of...
Investigation of Crack Width Development in CRCP
The traffic volume on German motorways increased steadily and this trend is expected to continue in the future. To guarantee mobility in the future and reduce the national economic consequential costs, road construction with a maximum service life and a minimum of necessary maintenance are needed. Rigid road pavements with...
Review of the Erosion Criteria for Bound Subbases in the Australian Rigid Pavement Design Procedure
The current Australian rigid road pavement design procedure considers both structural concrete slab fatigue and subbase erosion. The erosion component was introduced in the 1992 edition of the Austroads pavement design guide as nomographs and incorporated as algorithms in the 2004 edition of the guide. The erosion distress criteria were...
The First Concrete Freeway in South Africa
The first concrete freeway in South Africa was constructed between 1970 and 1971. It consisted of a dual carriageway, two-lane freeway with plain/jointed concrete pavement (PCP) for the traffic lanes and asphalt for the two shoulders. Three years after opening wider than normal hairline cracking was observed close to the...
Enhanced performance of concrete with use of Carbon Nanotube enriched liquid additive
The Carbon nanotubes (CNTs) in a liquid additive when used in the design and construction of concrete, serve as nucleation sites during cement hydration to help create a denser, cement paste composition. The result is improved durability and strength. CNT technology remains young within Australia; various laboratory and field trials...