Cementos Argos SA, Colombia’s biggest cement maker, agreed to buy RMCC Group Inc,  a US ready-mixed concrete supplier, for US$435m, RMCC’s controlling shareholder said Friday in a statement. 

RMCC is the leading provider of ready-mixed concrete in southern Virginia and owns a network of cement plants and a fleet of mixing trucks, the statement said. Audax, a private equity group, bought RMCC in November 2004. 

The transaction is expected to close during April after approval of regulators, the statement said.