| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a porous concrete block sufficiently securing air permeability, water permeability and environmental preservation property, which are the advantages of the porous concrete, and satisfying practical strength. <P>SOLUTION: In the porous concrete, in which coal ash, a thickener and a defoaming agent are kneaded into aggregate and a cement material, the thickener and the defoaming agent are mixed appropriately into the aggregate and the cement material and kneaded into a dense binder, thereby enhancing the adhesion to the aggregate and the strength and securing a proper porosity. <P>COPYRIGHT: (C)2005,JPO&NCIPI</p> |
