Measurement and Improvement the Quality of the Compressive Strength of Product Concrete

The research dealt with studying path technology to manufacture of concrete cubesaccording to specification design of Iraq to the degree of concrete C20 No. 52 of 1984, and inwhich sample was cubic shape and the dimensions (150 × 150 × 150) mm for each dimensionsand the proportion of mixing of the concrete is (1:2:4) using in the casting floor. For concreteresistance required that achieve the degree of confidence of 100%, were examinedcompressive strength 40 samples of concrete cubes of age 28 days in the Labs section of CivilDepartment – Technical Institute of Babylon, all made from the same mixing concrete. Where,these samples classified within the acceptable tests were adopted in the implementation ofinvestment projects in the construction sector. The research aims first, to measure thecompressive strength of concrete cubes because the decrease or increase the compressivestrength from specification design contributes to the failure of investment projects in theconstruction sector therefore, test was classified units that produced within damaged units.Second, to study an improvement the quality of compressive strength of concrete cubes.Results show that the proportion of damaged cubes are 0.00685, compressive strength wasachieve confidence level 99.5% and producing of concrete cubes within the acceptable level ofquality (3 Sigma). The quality of compressive strength was improved to good level useadvanced sigma levels.