Register | Login

WhilstJohnson used the same materials to make Portland cement as we use now, three essential tendencies in the production manner lead to trendy Portland cement:

• Improvement of rotary kilns

• Addition of gypsum to manipulate placing

• Use of ball mills to grind clinker and raw substances

Who Voted for this Story

TechyTape is a Google PageRank 4 DoFollow Social Bookmarking Site

High PR Social Bookmarking Sites List 2015