@article{Feras Al Adday_Aymen Awad_Rawan Aleghnimat_Hamzeh Bassam_Amer Khater_2019, title={FRESH AND HARDENED PROPERTIES OF RECYCLED CONCRETE AGGREGATE MODIFIED BY IRON POWDER AND SILICA}, volume={16}, url={https://geomatejournal.com/geomate/article/view/2865}, abstractNote={<p>In recent years, significant attention has been given by researchers to use recycled concrete <br>aggregate (RCA) instead of natural aggregate (NA) in concrete mixes to decrease the demand on the natural <br>aggregate resources and to reduce its environmental effects. This research work was carried out to investigate <br>the efficiency of using RCA in concrete mixes in place of natural coarse aggregate. 90 cubes of (100 x 100 x <br>100 mm) with different percentages of RCA (0%, 30%, 45%, and 60%) at water to cement ratio of 0.4 and <br>using 0% and 2.5% super plasticizer were casted. For that mix which was prepared with 45% of RCA 54 cubes <br>of (100 x 100 x 100 mm) were casted with different percentages of iron powder in place of fine aggregate (10%, <br>15%, and 20 %). Hardened test was examined to measure the compressive strength after 7, 14 and 28 days of<br>curing. Fresh property test was conducted (Slump test) to study the efficiency of using RCA on workability. <br>The results of the study showed that the fresh property was decreased by increasing the RCA replacement. The <br>compressive strength of the RCA was deceased by increasing the RCA replacement. For specimens casted <br>using 45% of the RCA the compressive strength was increased by increasing iron powder replacement.</p>}, number={53}, journal={GEOMATE Journal}, author={Feras Al Adday and Aymen Awad and Rawan Aleghnimat and Hamzeh Bassam and Amer Khater}, year={2019}, month={Jan.}, pages={222–230} }