RH plc, the Irish building materials maker, announced Monday a deal to buy the cement assets of Holcim Ltd. and Lafarge SA for 6.5 billion euro ($7.3 billion). The acquisition represents CRH's largest-ever deal and clears the way for the sellers to merger. Rivals Holcim and Lafarge announced a $39 billion deal last year to merge, following which it launched an auction to dispose of its cement assets. CRH took the lead in that auction last month, after trumping a joint offer from Blackstone Group LP and Cinven Ltd., The Deal's Paul Whitfield reported. The assets CRH has agreed to buy account for 'the vast majority of the divestments' requested by regulators in return for their approval of the merger, Holcim CEO Bernard Fontana said on a call on Monday.