The modern techniques development used in the production of concrete led to the emergence of types of concrete with different densities compared to normal concrete . This research aimed manufacturing types of lightweight aggregate (coarse and fine) and then the production of lightweight concrete blocks with a good thermal insulation , by using available locally materials . Two types of lightweight aggregate , have been produced by using two methods of manufacturing , first type , where AL-Hadbaa aggregate , produced from Clay , which is on the edge of the Tigris river in Mosul , using 50% Clay and 50% silt , the density obtained about 860 Kg/m3 . The second AL-Rabean aggregate , was the adoption of natural laminated Clay which is located in Nineveh province , in very large quantities , it's mineralization is Montmurlite and kaolinite , density obtained was 750 Kg/m3 , this type did not produce in Iraq and which it's manufactured method simple and economic . The standard tests have been made and were adopted in the production of concrete blocks , lightweight concrete block produced from AL-Hadbaa aggregate , used in bearing walls , have 28 – day compressive strength 15.33 N/mm2 and density about 1770 Kg/m3 .
The AL-Rabeaan aggregate used to product concrete block for the purposes of thermal insulation , it's thermal conductivity coefficient was 0.55 W/m.kcal and have a density 1640 Kg/m3 .
Keywords : Clay , lightweight aggregate , concrete block