(19)

(11)

EP 1 419 121 A2

(12)

(88) Date of publication A3: 16.10.2003 (43) Date of publication: 19.05.2004 Bulletin 2004/21 (21) Application number: 02760398.4 (22) Date of filing: 27.08.2002

(51) International Patent Classification (IPC)7: C04B 24/00 (86) International application number: PCT/GB2002/003926 (87) International publication number: WO 2003/018505 (06.03.2003 Gazette 2003/10)

(84) Designated Contracting States: AT BE BG CH CY CZ DE DK EE ES FI FR GB GR IE IT LI LU MC NL PT SE SK TR Designated Extension States: AL LT LV MK RO SI (30) Priority: 24.08.2001 GB 0120699 (71) Applicant: RMC Group P.L.C. Egham,Surrey TW20 8TD (GB)	(72) Inventors: GRIFFIN, Paul Northampton, Northamptonshire NN4 5BP (GB) GIBB, Ian London W5 3XR (GB) (74) Representative: Setna, Rohan P. et al Boult Wade TennantVerulam Gardens70 Gray's Inn Road London WC1X 8BT London WC1X 8BT (GB)