| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a manufacturing process of wood cement boards which smoothly hardens cement, even when a wooden reinforcement material obtained from a wood species containing a large amount of substances retarding the hardening of cement is used. <P>SOLUTION: A forming material in which sodium alum consisting of aluminum sulfate and sodium sulfate and sodium silicate are mixed in a mixture of a cementitious inorganic powder and a wooden reinforcement material is sprayed on a base board to form a mat. The mat is pressed and heated in the presence of water for primary hardening. The primarily hardened mat is cured at room temperature or in an autoclave. The aluminum sulfate in the sodium alum and the sodium silicate increase the strength of the primarily hardened mat and the sodium sulfate increases the ultimate strength of the hardened mat. <P>COPYRIGHT: (C)2006,JPO&NCIPI</p> |
