2010年7月8日星期四

Is there a universal international specification for portland cement ?

Ezch country has its own standard for portland cement , so there is no universal international standard . The united states uses the specification prepared by the american society for testing and materials -ASTM c-150 standard specification for portland cement . There are a few other countries that also have adppted this as their standard , however , thera are countless otehr spexifications . Infortunately , they do not use the same criteria for measuring properties and defininf physical characteristic so they are vietually " non-translatable ". The european Cement association located in Vrussels , belgium , publishes a book titled " cement standards of the world ?

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