| 摘要 |
<p>An alternative to portland cement which comprises a fine cement powder produced by pulverizing a hardened cement product containing at least one of a destruction rubbish of a hard wood chip cement board and an end board material by-produced during the production of such a board or an ettringite, classifying the product, to form a raw fine cement powder, and firing the raw cement powder at 650 to 850˚C to thereby activate the cement; a method for producing the alternative; and a hard wood chip cement board using the alternative. The alternative allows the production of a hard wood chip cement board which exhibits characteristics, such as flexural strength, similar to those of a board using portland cement alone as a cement material, even by the use of a cement material obtained by adding the above rubbish and/or end material to portland cement in an amount of 20 wt % or more, which leads to the increase of the reuse of the above rubbish and end material.</p> |
