A Taxpayer’s Guide to Joint Layout

Paper and Presentation by Todd Myers from ASCP 4th Concrete Pavements Conference 2017

Detailing of rigid pavement jointing is quite a simple task for standard road widths with no widenings, but when it comes to the atypical areas such as bridge approaches, widenings and roundabouts the task can be quite complex. The pavement designer must detail the jointing layouts so as to comply with design rules, regulations and standard details to ensure that all criteria are met.

Imagine a roadway with no widenings, no ramps and no roundabouts. How easy would that be to build? A paving practitioner’s dream. Yet conversely, imagine a roadway with numerous widenings (all at different widths) and ramps where the layouts prevent any substantial singe lane paving, a nightmare in the making!

Concrete paving machines are not designed to change width on the run and thus slabs need to be a constant width; thus any tapers automatically become a hand pours.

This paper will examine the constructability aspect of jointing layouts, and provide many examples of how poor jointing layouts can unnecessarily increase the cost of concrete roads for the taxpayers of NSW.

The aim of the jointing layout must be to maximise the use of multilane pavers by restricting any details that inhibit the paver’s progress. When it comes to single lane paving, the adoption of standardised widths for any widenings required will minimise downtime and reduce costs.

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