A meso scale compression test of the concrete specimen has been conducted in an in-situ X-ray computed tomography (XCT) facility. Concrete contained coarse aggregates of 5 mm and normal Portland cement. A specimen of 202020 mm3 size was studied under three cycles in compression. It has been scanned after the completion of each stage in a cyclic (e.g. immediate after loading to the peak and after the unloading) and two dimensional (2D) images of the microstructure were recorded with a resolution of 16.5µm. A great amount of pre-existing damage in the form of micro cracks and voids has been revealed in the scanned images. Further, the micro-mechanisms, such as crack opening and closing, crack tip extension and diversion, crack tip blunting, and elastic recovery of the crack openings and closures were also observed in the images from different cycles. Finally, digital volume correlation (DVC) was utilized to get the macro displacement fields during each load cycle.