Abstract
Summary The variation between thickening-time test results from tests on pilot blends and cement-blend sample tests has been a subject of frequent investigation. Disagreement between these test results is often blamed on improper additive proportioning, inadequate blending, or incorrect sampling techniques. A comprehensive study of blending, sampling, and testing variables was conducted. This paper describes the results of this research testing with a full-scale laboratory bulk plant. It also includes the results of a south Texas field study in which thickening time test results from more than 300 cement-blend samples were examined. Results of these studies suggest that significant statistical variations may be involved in blending, sampling, and testing procedures under deep-well conditions. The variabilities are used as guidelines for determining thickening-time acceptance windows. Variabilities or uncertainties can be minimized by optimization and standardization of these procedures.
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