Increase the amount of gases emission and construction materials waste was lead to increased interest to used recycled materials in building projects. In this research the effect and interaction of used recycle cement mortar as aggregate to replaced natural aggregate (sand) on cement mortar properties with variable curing time and constant water to cement ratio (W/C = 0.5) used is studied. Four group of cement mortar were produced (M0, M25, M50, M100) with different recycled aggregate weight percentage (0, 25, 50, and 100) . The compressive strength, density, water absorption and porosity percentage were tested. The results shows the compressive strength and density were decreased with recycle aggregate percentage increment in cement mortar composition, while, the water absorption and porosity percentage increased with recycle aggregate percentage increment in cement mortar ,. The lower compressive strength and density obtained in M100 samples were 26.08 MPa, 1.83 g/cm3, while; the higher compressive strength and density obtained in M0 samples were 32.95 MPa, 2.28 g/cm3, respectively. the higher water absorption and porosity percentage obtained in M100 samples were 12.05, 18.08, while; the lower water absorption and porosity percentage obtained in M0 samples were 7.86, 15.25, respectively

Cement --- mortar --- recycle aggregate

The present research intended to determine thermal properties (thermalconductivity, thermal diffusivity and specific heat) of concrete manufactured by recycle waste of clay brick and thermostone for using it as aggregate after crushing process. For this purpose, three concrete mixes were prepared one of them using crushed clay brick as aggregate and two others were used crushed thermostone as aggregate too, these three mixes compared with reference normal concrete mix.Specific heat was measured by using semi-adiabatic calorimeter method whereas thermal diffusivity was measured by using heating-cooling system. Thermal conductivity was obtained by multiplying the thermal diffusivity, specific heat and density. From experimental laboratory work, it was concluded that the thermal diffusivity increase with concrete density increment, but the specific heat was decreased with concrete density increment. Thermal conductivity had a linear relationship with thermal diffusivity. Mixing ratio also had an influence on thermal properties of concrete.

البحث الحالي يھدف الى تحديد الخواص الحرارية (معامل التوصيل الحراري, الأنتشارية الحراريةو الحرارة النوعية) لخرسانة مصنعة من المخلفات المعاد تدويرھا من الطابوق والثرمستون لأستعمالهكركام بعد عمليات التكسير. ولھذا الغرض تم تحضير اربع خلطات خرسانية واحده منھا بأستعمالمكسر الطابوق كركام والأثنان الاخرى بأستعمال مكسر الثرمستون كركام أيضا, وھذه الثلاث خلطاتتقارن مع خلطة خرسانية عادية مرجعية. الحرارة النوعي تم قياسھا بواسطة طريقة المسعر شبه الثابتللحرارة بينما الأنتشارية الحرارية تم قياسھا بطريقة نضام التسخين والتبريد. معامل التوصيل الحراريتم الحصول عليه بواسطة حاصل ضرب الأنتشارية الحرارية, الحرارة النوعية و الكثافة. من العملالمختبري أستنتج بأن الأنتشارية الحرارية تزداد بزيادة كثافة الخرسانة لكن الحرارة النوعية تقلبزيادة كثافة الخرسانة. معامل التوصيل الحراري يملك علاقة خطية طردية مع الأنتشارية الحرارية.نسب الخلط ايضا لھا ثأثير على الخواص الحرارية للخرسانة.

Recycle aggregate --- specific heat --- compressive strength --- thermal diffusivity --- absorption.