Roller Compacted Concrete, Concrete for Low Traffic Roads, Joint Seal Trial, Transport for NSW Update

ASCP On Demand Forum (Video 2 hours running time) - Corey Zollinger, Justin Moss, Antonn Russek, Shamim Anwar - 18 August 2020

RCC is a no slump concrete placed by an asphalt paver and compacted with vibratory rollers. Corey Zollinger will outline the many benefits of RCC including speed of installation and opening to traffic. His presentation will include recent advances in mixtures with admixtures, aggregate selection and surface finishes.

Following recent findings that concrete pavements were lower cost to both construct and maintain (refer Pavement Note 001) at nominal motorway traffic loadings, additional research was undertaken to investigate the sensitivities of asphalt and concrete pavement life cycle costs to various traffic levels. Specifically, the objective of this work was to determine the absolute traffic level at which concrete pavements (PCP) became cost-effective compared with asphalt (FDA). Justin Moss will detail the findings of the work and the implications to future lower duty applications for concrete pavements.

The M1 Motorway Kariong to Somersby Project is situated above Gosford on the Central Coast. The M1 is the key transport link between Sydney and the north of NSW. This section of the M1 was constructed in 1986, and the neoprene joint seals that were installed for significant sections of the pavement have performed extremely well. Following pavement reconstruction at K2S, a small section of pavement was again sealed with modern neoprene seals, prior to diamond grinding of the pavement surface. Antonn Russek will present the lessons learnt from this activity and the existing neoprene seals, which are of significance to the future direction for joint sealing when considering the current challenges presented with silicone seals.

Shamim Anwar will provide an update regarding the review of several TfNSW specifications, including NFC subbase, diamond grinding, maintenance, binders and hot poured sealants, the 2020-21 technology programs, and HES subbase concrete mix trials.

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