Twenty-two tonnes of cement were yesterday dumped in the middle of Hong Kong Stadium as preparations gathered pace for the Cathay Pacific/Wheelock NatWest Hong Kong Sixes next week. The artificial wicket for the September 21-22 competition was laid yesterday - a cement base which needed three truckloads of ready-made mixture poured in. After the cement sets in four days the artificial surface will be glued on. 'The wicket will be fast, but not too lively,' said Carl Martin, overseer of the workforce from Super Turf Sporting Surfaces Ltd. A 30-metre long, three-metre wide and 10-centimetre deep strip right down the middle of the ground had earlier been dug up and a wooden frame inserted before the cement was poured in. 'The day after the Sixes are over we will move in and take out the wicket. The Stadium authorities will then put back the pieces of turf which have been cut out,' said Jim Middleton, the local agent for the Australia-based company dealing in artificial wickets. Organisers of the Hong Kong Sixes have also decided against changing the pitch's alignment. Instead of the proposed slant, the wicket is now on a North-South axis.