Alternative to portland cement, method for producing the same, hard wood chip cement board using the same and method for producing the board

Abstract

It is an object of the present invention to provide a portland cement substitute which shows no deterioration of various characteristics (e.g., bending strength) even when incorporated with chips or wastes discharged from a hard cemented chip board production process at 20% by weight or more to reutilize them, method for producing the same easily and economically, hard cemented chip board comprising the same, and method for producing hard cemented chip boards comprising the same. The present invention provides a portland cement substitute comprising fine cement powder obtained by crushing and classifying at least one type of hard cemented chip board wastes and chips, or cured cement containing ettringite, wherein the cement powder is fired at 650 to 850° C. for activation, method for producing the same, hard cemented chip board comprising the same, and method for producing hard cemented chip boards comprising the same.

Dependencies are inferred from the claim text.