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  1. 1970-01-01 This study was undertaken primarily to determine whether the manufacture of lightweight concrete bricks, on a small scale and using rice husks as an aggregate, is economic. Technical details of the process are not included in this report which is restricted primarily to the costing of a...
  2. 1990-01-01 Clay is a hydrous aluminum silicate formed by the deterioration of a number of minerals over a long period of time. When glue-like organic material is associated with it, the clay becomes plastic or hand moldable and pliable. It is found throughout the world and has been treated, since time...