The world’s number three cement maker has offered US$13/share or US$12bn ($A15.23bn) for rival Rinker, which earns most its revenue from cement sales in the US market.
The offer equates to $16.53 per share, after adjusting for recent foreign exchange rate movements.
Rinker has rejected the bid as inadequate.
The offer period has been extended to January 31, from December 27.