Proposal of a methodology for assessing the reliability of in situ concrete tests and improving the estimate of the compressive strength

Comparison of Strength–Maturity Models Accounting for Hydration Heat in Massive Walls

“…However, as commonly recognized (Haug and Jakobsen 1990;Puciontti 2013;Uva et al 2013), the curing histories of a standard-cured specimen and an in-place concrete member would not be identical. Thus, the strength development of a laboratory specimen would differ from that of a structure under construction.…”

“…Only 2 cores per location and testing age were tested because of the size limitation of the mock-up walls. The core strength is affected by aspect ratio and diameter of the cores, presence of embedded reinforcement, and disturbance owing to drilling (Uva et al 2013). Thus, the compressive strength (f core ) of the cores was corrected using a single relationship specified in ACI 214.4R-10 (2010), as follows:…”

Effects of “Reinforced” Infilled Frames on Existing Rc Buildings

“…The data acquired by non destructive methods have been used in order to support and integrate the estimate of in-place concrete strength provided by the compressive tests on drilled cores. In the literature, several methods and procedures have been proposed for the correlation of significant data (for example, the compaction degree) in order to obtain reliable estimates of the compressive strength and assess the possible presence of different homogeneous classes of concrete [24]. In the present case, the numerical processing has involved the use of rebound hammer index, ultrasonic pulse velocity and compressive core strength.…”

Instructions Overview on the Regional Scale Analysis of School Buildings in Puglia (Italy)

“…In fact several researches [21,22] show that the strength value obtained by the on-site tests depends on a lot of factors (compaction degree, decay of materials, damage, ...). However, this issues aren't the core of the present work that it only wants to provide an overview on the regional scale analysis of the school buildings of Foggia.…”