Associated Cement Companies Ltd today said it has received approval from the Bombay High Court for the merger of Tarmac (India) Ltd with itself.  The company informed the Bombay Stock Exchange that the scheme of amalgamation was approved by the High Court and all requisite formalities had been completed.  The scheme is effective from August 28, 2006 and the appointed date under the scheme is January 1, 2006, ACC added.