Statistical Quality Control of Cement: A Case Study at Local Cement Plant

Abstract

Understanding, controlling and improving quality are key factors leading to business success, growth and enhanced competitiveness. Statistical quality control has significant contribution in this regard. This research work is about observing (checking) whether the process producing cement in local cement plant is in statistical control and estimating the process's capability. Twenty three consecutive data on the fineness of the cement powder were collected from the process of the grinding mill 2 of the plant. Using the data, the individual and moving range control charts were plotted. The analysis of the individual and moving range charts indicates that the process is in control whereas the capability ratio of the process shows the process is not capable.