Siam City Cement, has appointed Leo Mittelholzer as managing director, replacing Vincent Bichet, who has moved to head Holcim’s unit in France.  Siam City Cement is scheduled to hold a press conference Thursday to announce its policies under the new management. It will also announce the launch of a new product.  Siam City Cement is Thailand’s second-largest cement maker with an annual production capacity of around 10Mt.