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A platform for research: civil engineering, architecture and urbanism
Comparison of field and laboratory strengths of concrete slabs
The existing practice for acceptance of newly-constructed concrete pavements is usually based on the strength of specimens prepared and cured under ideal conditions. These tests can be used as a standard for acceptance, but they do not address the quality of the construction and/or the adequacy of the field curing process, differences in placement, compaction, or environmental conditions. Strength tests can also be performed on specimens extracted from the completed structure. However, coring operations are costly and specimens may experience internal damage. Nondestructive technologies (NDT) in general and seismic methods in particular can be used to estimate the in-place strength of concrete slabs. These NDT methods rely on measuring the velocity of propagation of elastic waves within the concrete. Velocities can be converted to modulus of elasticity and relate it with high confidence to strength. To complete this study, ten different concrete mixes or curing methods were investigated. Estimated field strengths were typically lower than those measured on lab-cured specimens prepared at the site with the same mixes. On average, differences of 15% with the 28 day strength were observed. The differences are significant enough that may impact the performance of the materials.
Comparison of field and laboratory strengths of concrete slabs
The existing practice for acceptance of newly-constructed concrete pavements is usually based on the strength of specimens prepared and cured under ideal conditions. These tests can be used as a standard for acceptance, but they do not address the quality of the construction and/or the adequacy of the field curing process, differences in placement, compaction, or environmental conditions. Strength tests can also be performed on specimens extracted from the completed structure. However, coring operations are costly and specimens may experience internal damage. Nondestructive technologies (NDT) in general and seismic methods in particular can be used to estimate the in-place strength of concrete slabs. These NDT methods rely on measuring the velocity of propagation of elastic waves within the concrete. Velocities can be converted to modulus of elasticity and relate it with high confidence to strength. To complete this study, ten different concrete mixes or curing methods were investigated. Estimated field strengths were typically lower than those measured on lab-cured specimens prepared at the site with the same mixes. On average, differences of 15% with the 28 day strength were observed. The differences are significant enough that may impact the performance of the materials.
Comparison of field and laboratory strengths of concrete slabs
Vergleich der Feld- und Laborfestigkeiten von Betonplatten
Celaya, Manuel (author) / Nazarian, Soheil (author) / Yuan, Deren (author)
2009
6 Seiten, 4 Bilder, 1 Tabelle, 6 Quellen
(nicht paginiert)
Conference paper
Storage medium
English
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