Materials Exam 1: Portland Cement Flashcards | Quizlet
Clay, iron ore, Mill scale **types of Silica Oxide. clay, marl, sand, shale ... Limestone, Iron Ore, Sand, Clay. With the correct mixture of these materials, you get the right amount of chemical compostion needed for successful portland cement ... Gypsum controls the rate that the cement will harden. 5% of the mixture of gypsum is added. This ...