| 摘要 |
<p>PROBLEM TO BE SOLVED: To obtain an artificial aggregate high in strength, low in water absorption and capable of forcibly pumping of green concrete by granulating a raw material containing expandable shale and construction sludge and firing the granule. SOLUTION: The suitable blending ratio of the construction sludge to the expandable shale is 2-100 pts.wt. construction sludge to 100 pts.wt. expandable shale. For the granulation of the mixture of the expandable shale with the construction sludge, an extrusion type molding machine (extrusion granulator) or a pan type pelletizer is preferably used. The firing temp. of the granulated material is preferably 1,100-1,200 deg.C. The firing method of the granulated material is preferably a method using a rotary kiln or a fluidizing roaster. The shale having <=3 mm particle diameter is obtained by pulverizing further and screening middle sized shale (5-3 mm) generated by pulverizing and screening the raw shale, and the artificial aggregate is obtained by adding water into the raw material containing the resultant shale having <=3 mm particle diameter and/or fine sized shale and the construction sludge, granulating the mixture followed by firing and then screening.</p> |
