Report by Jason Naim, Recycled Glass In Concrete Pavement Pacific Highway Upgrade Woolgoolga To Ballina - Richmond River To Ballina, 2020
This report summarises the work undertaken by Lendlease Engineering in carrying out the demonstration of the use of Recycled Crushed Glass (RCG) in Concrete Pavements on the Woolgoolga to Ballina Project.
This demonstration was undertaken with funding from the New South Wales Environment Protection Authority’s (NSW EPA) Civil Construction Market Program and supports the NSW EPA Recovered Glass Sand Order 2014 (NSW EPA, 2014) in relation to supplying recovered glass sand for road making activities.
The Woolgoolga to Ballina Project (W2B) comprises approximately 155 kilometres of four-lane dual carriageway motorway currently being delivered by the NSW Government. Lendlease Engineering (LLE) have successfully bid on Sections 10 and 11 Integrated Works (R2B), which includes approximately 80,000 m3 of pavement concrete.
Roads and Maritime Services (RMS) Specifications, R82 and R83, allow the use of RCG at up to 15% replacement of the fine aggregate (sand) (Roads and Maritime Services, 2018) (Roads and Maritime Services, 2017). RCG must also meet the requirements of RMS Specification 3154 (Roads and Maritime Services, 2011).
Lismore City Council (LCC) at their Material Recycling Facility (MRF) recover and separate waste glass through their collection process. This waste glass is stockpiled and then crushed to produce an RCG.
As part of the R2B, undertaken by LLE, a demonstration was undertaken to incorporate the RCG from LCC in the pavement concrete mixes as a substitute for sand currently being extracted from nearby quarries.
Funding for the RCG Project was provided through the NSW EPA’s Civil Construction Market Program to cover the additional costs associated with the assessment and use of RCG within R2Bs pavement concrete mix. Specifically, the testing, processing, washing and blending of the RCG to enable compliance with the applicable Roads and Maritime Services engineering quality specifications, and compatibility with the batch plant configuration.
Through the onsite demonstrations, it was proven that RCG, when conditioned properly, does not have any adverse effects to the quality of the concrete produced. In total, about 2,000 m3 of Concrete Pavement containing RCG was placed on the Project during four days of paving. This sustainability initiative diverted 220 tonnes or over 1 million glass bottles from local landfill.
This demonstration is a first for main line concrete pavement on the Pacific Highway upgrade and supports the potential to increase use of RCG in current and future projects.