Research Articles | Challenge Journal of Concrete Research Letters

On the strength prediction in concrete construction based on early age results: Case studies

Hossein Akbarzadeh Kasani
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Abstract


Early prediction of strength is crucial in planning for stripping off the formworks and preventing non-working days in concrete construction projects. There are several empirical correlations which allow estimation of concrete strength from early age results. However these correlations have limitations in application. This study established an experimental database which comprised of 382 datasets of strength tests of ordinary Portland cement concrete. These tests were performed over a period of 8 years as part of QA/QC program on 51 construction projects in the Province of Guilan, Northern Iran. From the data, strength ratios between ages (27 and 8 days), (42 and 7 days), (42 and 14 days), and (42 and 28 days) were analysed. New linear and power relations were proposed for estimating 28- and 42-day strength values. Analyses of relative errors along with cumulative probability approach revealed that three well-known models from literature were inaccurate in prediction of strength. It was found out that a correlation by Slater (1926) over-predicted 28-day strength from 7-day test data. Furthermore, the ACI committee 209 (1997) and CEB-FIP (1990) models under-predicted 42-day strength using 28-day strength results. This research should assist in the global, yet simple, understanding of concrete strength development with age.

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