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Publication Date

Fall 2021

Degree Type

Thesis - Campus Access Only

Degree Name

Master of Science (MS)


Civil and Environmental Engineering


Akthem Al-Manaseer

Subject Areas

Civil engineering


K-slump testing is an alternative method of evaluating the consistency of concretemixtures. This study re-examines the single-operator and multi-laboratory precision of testing freshly mixed concrete with a K-slump tester in accordance with ASTM C1890. In addition, the precision of another parameter called the workability index, W, and the sum of K-slump and W, K+W were also examined. This study analyzed the precision of tests performed on concrete mixtures according to the statistical procedure in ASTM Standard C802. The single-operator and multi-laboratory results for K-slump, W and K+W were also analyzed with the Bartlett’s test to determine if the variances could be considered statistically equal for the purpose of evaluating the pooled standard deviation. The Bartlett’s test showed that the single-operator variances could be combined to determine the pooled single-operator standard deviation for K-slump. The precision from this study was compared with the single-operator standard deviation and multi-laboratory standard deviation for K-slump in ASTM C1890, established by the parent program.