No - imagine taking out the frost plugs and pouring concrete in to the block until its half full.
Here ya go - apparently Yanks call it Hard Blok
http://www.jegs.com/webapp/wcs/stores/servlet/KeywordSearchCmd?storeId=10001&catalogId=10002&langId=-1&Ntk=all&Jnar=0&Ne=1%2B2%2B3%2B13%2B1147708&searchTerm=hardblok