| Show mortar 31 the use of brick dust mortar as a 1 substitute for hydraulic cement Is now recommended om orn on the best engineering authority tho rity experiments made with mixtures of brick dust and quicklime line sho showing that blocks of one half inch in thickness after immersion in water for I 1 tour four months bore without grusbin crushing cr crumbling or splitting a p pressure of 1500 pounds per square inch the u use se of brick dust mixed with lime and sand Is said to be generally and successfully practiced in the spanish dominions and Is stated to be in all respects sli si to the best cement in the cu co n st ruction of cu lverts drains tanks or cisterns stema ci |
