Project Status: Completed


Adequate compaction at every stage of construction ensures we achieve stronger roads and the layers themselves will able to withstand the destructive erosive forces of water. Each type of material and each layer of construction needs to be appropriately tested to ensure they meet the required level of compaction before work can continue. Some of the test methods used are time consuming or destructive and WARRIP is reviewing our tests against national and international practices. If more efficient, safe, reliable test methods can be identified, this could significantly assist our construction industry projects across the extensive WA road network.


In an effort to assist Main Road WA find more efficient and cheaper methodologies, WARRIP reviewed several aspects of the Main Roads WA density compliance process for the compaction of subgrade and embankments to identify areas for future investigation.


The current density compliance processes for subgrade and embankment construction used by Main Roads WA have operational limitations, require destructive testing and can produce varying results. This process is time consuming and resource intensive.

WARRIP reviewed several aspects related to the density compliance process to identify alternatives to the current methods which can optimise time and reduce cost, but also ensure a high-quality outcome.


This project undertook a vast review of national and international literature on the above aspects related to density compliance to identify more efficient techniques which could be investigated further for inclusion into MRWA specifications.


The literature review identified some areas which warrant further investigation through separate WARRIP projects. These future projects included:

In depth review of national and international practice for density compliance processes to identify improved methods

Submission of a PSP method specification framework to be trialled during a future construction project

Future WARRIP projects to be scoped based on several promising findings