This study suggests that the impact of management efforts does not appear clearly through the process of testing concrete specimens either when accepting or refusing cases. To make this impact clear, a simple model is used to control the quality of concrete that is measuring the process capability index witch gives a visible picture of the producing quality. Many tests were done on several concrete specimens produced from one identity (batching plant) to measure the real slump. Data is collected, and statistical analysis is made, which enables the manager to assess the level of quality of each batching process by using the calculated process capability index. The study showed that the process of accepting or refusing concrete according to the limitations of building codes is not sufficient to evaluate the quality of produced concrete. Results showed that the two groups of tests seem acceptable, but the group (1) gained a process capability index of 0.62 (not capable) and group (2) a process capability index of 1.15 (capable). Management decision is required to assess the level of management effort and accordingly, the quality of concrete. This is a trade-off process between the required quality and the corresponding cost.
Volume 12 | 01-Special Issue