| الملخص | This study was carried out to assess the possible use of Tellol Al–Kind clay deposit in Naenava from Injana formation city for the production of lightweight aggregates. Two methods of heat treatment were experimentally tried. Iso-thermal firing was conducted at 1180- 1200˚ C range using different socking time for aggregates made from clay only. Whilst, rapid (flush) firing at 1200˚C was tried for group, of clay mixed with different types and amounts of additives (dolomite, waste engine oil, and straw).The iso–thermal tests reveals, that bloating can occurs only at 1180˚C for 45 minutes holding time. The aggregates obtained, have a sp.gr. Of about 1.38 with about 0.8 % water absorption value. In the rapid firing, it was found the bloating of the clay can only significantly improved by the addition of dolomite. The results obtained indeceted that aggregates of 1.35 sp.gr. with about 1% water absorption value can be produced from aggregates made of clay + 5 wt % dolomite. The firing time being about 5 minutes. These results encourage the use of Tellol Al- Kind for the production of lightweight aggregates. Obviously, from economic stand point rapid firing is recommended. This lightweight aggregate can be used in insulation fill in constructions. | |
