The process of study was divided into next two directions.
(1) Properties at room temperature.
(2) Properties at high temperature. (up to 1, 000°C.)
As the properties at room temperature, permeability and bonding strength were observed, and the effect of several factors on these properties was studied; namely, the effect of amount of water and clay, shape and size of sand and number of ramming.
In the first report the study of permeability was descrived
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