This project aimed to evaluate best-practice non-destructive density testing methods for asphalt layer acceptance and assess the suitability of emerging technologies for asphalt quality assurance across Queensland’s road network. A review of local and international practices confirmed that asphalt cores remain the preferred method for density acceptance, while nuclear gauges are also widely used. The PQI380 electromagnetic density device was identified as a promising alternative due to positive results in previous studies, its acceptance by some US road agencies, and its growing use by Queensland contractors for construction quality control. To support its evaluation, industry workshops were held to gather data and facilitate comparative field trials, and a draft testing and calibration procedure was developed for participating contractors. However, the volume of data collected was insufficient to undertake a robust statistical assessment of the PQI380’s suitability as a replacement for, or supplement to, traditional testing methods such as cores and nuclear gauges. Consequently, the project was extended to June 2020 to enable the collection of additional data and support a more reliable determination of the device’s effectiveness for use in Queensland conditions.
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