Determination of the Multi-Laboratory Coefficient of Variation and Dispersion According to ASTM C-39 for Cylindrical Concrete Cores

Huaman L.A.C.; Lingan V.A.Z.; Huaricallo Y. · Mathematical Modelling of Engineering Problems (2025) · DOI: 10.18280/mmep.120923

Resumen

This study evaluates the variability in the results of compressive strength tests of concrete, which were carried out in four laboratories in the city of Trujillo, Peru, following the guidelines of the ASTM C-39 standard. While all laboratories applied similar technical procedures, variations in curing conditions, test ages, and equipment calibration traceability were identified, affecting the reproducibility of the results. The samples were tested at different ages (3, 7 and 28 days in TEM; only 28 days in the other laboratories), which partially limits comparability. The coefficients of variation (CVs) ranged from 2.1% to 5.8%, and in some cases, approached or exceeded the typical accuracy limits recommended by ASTM C-39 for multi-laboratory evaluations. The study highlights the need for greater standardization of procedures and improved metrological traceability to ensure consistent and reliable results.

Instituciones: Universidad Privada del Norte