Science and Education Publishing American Journal of Civil Engineering and Architecture 2328-3998 3 5 2015 09 06 Experimental Time-Dependent Deflection of High Strength Concrete Panels 153 157 EN Bayan S. Al Numan Civil Engineering Department, Faculty of Engineering, Ishik University, Erbil, Iraq Faris R. Ahmed Zahraa N. Rashied AJCEA2015351 10.12691/ajcea-3-5-1 2015 08 02 2015 08 25 2015 09 06 This work presents an experimental study on both short-term and long-term deflections for a period more than seven months of reinforced high and normal strength reinforced concrete two-way flat plate panels. Four reinforced concrete panels with dimensions of (960×960×50) mm were investigated with simply supported edges. Concrete cube strength is about 75 MPa for HSC panels, and 30 MPa for the control panel. Sustain load kept along the entire test period and at the end, the loads is removed and the recoverable deflection was measured. It's been concluded that the rate of increase in HSC panels' long time deflection is less than that of NSC panels, also the long-term deflection is highly reduced by increasing the compressive strength of concrete and the long term deflection reduced about 20% when compressive strength increased from 25 to 65 MPa.