| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a water-retentive brick for inhibiting the heat island phenomenon of an urban section. <P>SOLUTION: In the water-retentive brick and its manufacturing method, in which the coagulated particles of high melting-point waste such as water purification sludge are used as a water retention material and the water retention material is dispersed to blended clay as the base of the brick in 5 to 80 wt. %, which is manufactured by an extrusion molding method and baked and in which a bending strength is 10 MPa or more, a natural water absorption at a time when the thickness of the brick is 9 L/m<SP>2</SP>or more, the mean pore diameter of the brick is 1 to 20 μm and a strength and a water retentivity are made compatible. In the water retention material, a maximum particle size is 3 mm or less, and a particle content of 50 μm or less is occupied by the coagulated particles of 50% or less. The component of sludge is composed of the composition of Si0<SB>2</SB>/Al<SB>2</SB>0<SB>3</SB>=0.5 to 2. <P>COPYRIGHT: (C)2005,JPO&NCIPI |
