Ready-mixed concrete is the basic construction material used in large quantities for constructionrnpurpose all around the world. With enlarged focus on infrastructure and housing activities, use ofrnconcrete in several forms are growing from time to time. Concrete that is batched in a controlledrnenvironment at a central plant instead of being mixed on the job site which is called ready-mixedrnconcrete brought better option for such a developing demand. Quality control is all the measuresrnthat are taken during material selection, concrete production processes and on finished concreternproducts to ensure the compliance of works with the specification. Concrete structures fail beforernmeeting the required service life due to lack of proper quality control. This research is done onrnReady-mixed Concrete Quality Control Practice in Addis Ababa.rnThe objective of this research was to investigate ready-mixed concrete quality in general and tornidentify main factors hindering quality control in particular. The research was carried out byrnthoroughly reviewing previous studies, desk study done by collecting concrete test results fromrnthird party laboratories, interviewing regulatory bodies, structured and open-ended questionnairerndistributed to ready-mixed concrete producers and detailed observation of batching plants andrnconcrete casting sites.rnFrom the study it is observed that lack of periodic calibration of batching plants and machines,rnlack of regular maintenance of batching plants and equipment, and improper batch plantrnarrangement (general location) were found to be the major factors affecting ready-mixed concreternquality control practice. In addition, improper raw material storage location, age of batching plant,rnincompetence of the batch manager has also their own impact on ready-mixed concrete quality.rnAs per the evaluation of the test results, based on compliance criteria of Ethiopian standardsrn(EBCS-2:1995) 60% of the lots found to be defective where as 40% of samples are non-defective.rnBased on compliance criteria of ACI 318, the result show that, the number of defective lots goesrndown to 47.6 % and that of non-defective goes to 52.4%. Shewhart Chart was used to evaluate thernprocess of ready-mixed concrete quality control and showed that the RMC quality control practicernis poor. Generally, the quality control practice of RMC in Addis Ababa is not properlyrnimplemented and as a result the expected strength of the concrete is not gained.