TRL was commissioned to show how construction waste and materials such as incinerator bottom ash and steel slag could be used as recycled and secondary aggregates in Qatar. With no local experience or knowledge in this area, our client sought TRL’s expert help.

The challenge

Qatar is undergoing a massive construction programme of new buildings and infrastructure fuelled by oil and gas revenues. All aggregates for concrete and asphalt are imported, as Qatar has no reserves of hard rock. However, large amounts of construction, demolition and excavation waste are currently being dumped in the desert.

Our approach

Combining the local operational knowledge of staff based in Qatar and TRL's extensive UK expertise, the project has assessed the options, carried out laboratory trials and created demonstration projects. There has been extensive liaison with government bodies, contractors, aggregate, concrete and asphalt suppliers and testing laboratories throughout the project.

The results

The trials have shown that recycled and secondary aggregates can be used successfully in structural and ancillary concrete and concrete blocks as well as unbound applications. Using them could reduce the amount of aggregate that has to be imported and lead to considerable savings in both cost and greenhouse gas emissions.

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