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

الملخص

The research dealt with studying path technology to manufacture of concrete cubes
according to specification design of Iraq to the degree of concrete C20 No. 52 of 1984, and in
which sample was cubic shape and the dimensions (150 × 150 × 150) mm for each dimensions
and the proportion of mixing of the concrete is (1:2:4) using in the casting floor. For concrete
resistance required that achieve the degree of confidence of 100%, were examined
compressive strength 40 samples of concrete cubes of age 28 days in the Labs section of Civil
Department – Technical Institute of Babylon, all made from the same mixing concrete. Where,
these samples classified within the acceptable tests were adopted in the implementation of
investment projects in the construction sector. The research aims first, to measure the
compressive strength of concrete cubes because the decrease or increase the compressive
strength from specification design contributes to the failure of investment projects in the
construction 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 was
achieve confidence level 99.5% and producing of concrete cubes within the acceptable level of
quality (3 Sigma). The quality of compressive strength was improved to good level use
advanced sigma levels.