Lesotho’s Metolong dam to be completed in Sept
After missing its targeted April completion date, as a result of heavy rainfall in the area, the Metolong dam, which forms a key component of the Metolong Dam Water Supply Programme (MDWSP), in Lesotho, is expected to be completed by September, fly ash product manufacturer and project supplier Ash Resources has stated.
Metolong, a 83-m-high roller-compacted concrete (RCC) dam, with a design crest length of 280 m, was being constructed on the Phuthiatsana river and formed part of a larger programme designed to cater for the long-term water needs of the lowland areas in Lesotho.
In particular, it would provide a new raw-water supply for the country’s capital, Maseru, and the surrounding area, which had historically suffered from water shortages.
Ash Resources had supplied some 22 000 t to date of its classified siliceous fly to Sinohydro, the Chinese contractor for the Metolong dam project, which included the development of the inlet tower and associated pumping station.
A further 11 000 t of fly ash would be required to complete the dam contract.
Ash Resources had also delivered around 4 000 t of fly ash to other contractors and ready-mixed concrete producers for the construction of the MDWSP’s water purification works, a raw-water reservoir and portions of the pipelines.
Meanwhile, Sinohydro established an on-site batch facility to provide the estimated requirement of 280 000 m³ of RCC and 40 000 m³ of conventional vibrated concrete (CVC).
“A high fly ash content in the RCC for construction of a dam helps to control heat of hydration during mass concrete pours and Sinohydro accepted mix design recommendations for the RCC mix to contain 66% and the CVC mix 52% of Ash Resources’ siliceous fly ash,” the company explained in a statement.
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