The company was formed through the merger in 1970 of Cement Ltd ( established in 1936 ) and Roadstone Ltd ( established in 1949 ) .
The company 's name began as an abbreviation of Cement Roadstone Holdings .
The company , whose name began as an abbreviation of Cement Roadstone Holdings , was formed through the merger in 1970 of Cement Ltd ( established in 1936 ) and Roadstone Ltd ( established in 1949 ) .