EVALUATION OF TELLOL AL-KIEND CLAY IN MOSUL CITY FOR THE PRODUCTION OF LIGHT WEIGHT AGGREGATES

Abstract

In this research a representative sample from Tellol Al-Kiend clay deposit (Injana Formation), Naenava Governorate, Iraq, was evaluated for lightweight aggregates preparation. Two methods of heat treatment were carried out. Iso-thermal treatment conducted at (1180 – 1200) °C range, for aggregates made from clay only, using different socking time. Whiles, rapid (or flush) firing, were carried out at 1200 °C, for aggregates made from clay with different types and amounts of additives (dolomite, waste engine oil, and straw). The iso-thermal tests reveal that bloating can occurs at 1180 °C only for 45 minutes holding time. The aggregates obtained, have a specific gravity of about 1.38 and 0.8% water absorption. In rapid firing, it was found that, the bloating of the clay can be significantly improved by the addition of dolomite. The results obtained indicated that aggregates having 1.35 specific gravity with about 1% water absorption value could be produced from aggregates made of clay and 5 wt.% dolomite. The firing time has been about 5 minutes. Thereupon, it can be suggested that, Tellol Al-Kiend clay can be used for the production of lightweight aggregates by rapid firing. Concrete made from these lightweight aggregates shows a compressive strength (28 days) of about 173 kg/cm2, which can be designated as structural and insulating concrete.