Projects
The Karratha Sludge Beds project for Watercorp involved remedial works at the Wastewater Treatment Plant’s sludge drying beds, originally constructed in 2013. Each of the 24 beds measures approximately 30 metres wide by 20 metres long, with perimeter concrete walls about 1 metre high. Due to seepage issues, Water Corporation opted to construct concrete floors within ten of these beds to contain the sludge effectively.
Works encompassed comprehensive construction and quality management, including the removal of existing materials from the sludge beds and detailed excavation of bed bases to meet design specifications. Foundations were compacted to 95% Modified Maximum Dry Density (MMDD). The project also included the placement of 580 cubic metres of concrete slabs with 75 tonnes of reinforcement, along with curing procedures. Water-stop and joint preparation, as per design drawings, covered 680 linear metres. Concrete remedial works were undertaken across the ten selected beds, and 800 linear metres of drainage were installed, alongside plumbing works connecting to existing infrastructure. Additionally, 1,500 cubic metres of aggregate and sand were installed to complete the project requirements.
Highlights of the project included achieving zero lost time injuries or first aid incidents throughout the duration of the project, demonstrating a strong commitment to safety. Concrete pours were successfully completed according to the project schedule, ensuring timely execution and delivery.