| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a concrete block which has excellent water permeability and water holding property while keeping strength, facilitates vegetation on the surface and is capable of suppressing the production cost. <P>SOLUTION: The concrete block is press-formed in a prescribed shape in such a manner that the whole is porous and the porosity becomes nearly 8.1-11.4 % by adding fine aggregate and water together with normal portland cement or high-early-strength portland cement of nearly 13.4-19.1 wt.%, powder coal of nearly 1.3-1.4 wt.%, coarse aggregate of nearly 69.5-70.8 wt.% and kneading them. <P>COPYRIGHT: (C)2005,JPO&NCIPI</p> |
