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Following the international oil crisis in the 1970s, Hong Kong's two electricity generating companies built large coal-fired stations which now produce about 1Mt of pulverised fuel ash (PFA) p.a. In common with most other countries the disposal of this ash presents problems, exacerbated in Hong Kong by its small land and sea areas and strict environmental controls. The opportunity to help overcome this problem - and, at the same time, improve the quality - of structural concrete by using classified ash as a partial cement replacement - was recognised in the early 1980s. In 1982 the first local classification plant, at the Hong Kong Electric Co. Ltd's station at Lamma Island, was commissioned. Some of the ash from China Light & Power Co. Ltd's plant at Tap Shek Kok is now classified, and some is used as a raw material for the production of OPC to BS12 in the nearby China Cement Co. (HK) Ltd works and in the production of 15% and 25% PPFAC blends. R.H. Pilling
Born in Tianjin, a major commercial city in north China, CHENG Hon-kwan - known to his colleagues and friends as ‘H.K.’ - spent his early years in Beijing and Tianjin. He received his secondary education at the Tientsin Anglo-Chinese College, founded by the London Missionary Society, where one of the teachers then was the Rev. Eric Liddell, the well-known Scottish Gold Medallist of the 1924 Olympics. Mr Cheng undertook his civil engineering training at Tianjin University where he obtained his bachelor’s degree in 1948.
To engineers practising in the UK or elsewhere in the world, the term ‘caisson’ is normally taken to denote mechanically bored pier foundations in land formation or a large floating prefabricated box to be sunk into a river or seabed. Y.W. Mak