To produce an ultra-lightweight concrete low in unit volume weight and high in compression strength.
In the ultra-lightweight concrete, a coarse aggregate, an ultra- lightweight aggregate as a fine aggregate, a binder and a city water are used as main materials. A Portland cement specificated in JIS (JIS R 5210) can be used as the binder. A ceramic based burned matter, an artificial aggregate such as expansive shale burned matter and an artificial aggregate consisting of the ceramic based burned matter are used as the ultra lightweight aggregate. A preferable slump value is 9.5-14.5 cm. When the slump value is less than 9.5 cm, a shuttering application is difficult and filling property becomes worth. On the other hand, when the slump value is more than 14.5 cm, the aggregate and a cement paste are liable to be separated and the fear of application failure is caused.
ISHIZEKI YOSHIKAZU
SATO KOICHI
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