TY - CHAP
T1 - Assessment of Deviations in Concrete Properties Quantified Under Laboratory Conditions and from the Construction Site
AU - Ov, David
AU - Lozano Valcarcel, Juan Mauricio
AU - Kränkel, Thomas
AU - Breitenbücher, Rolf
AU - Gehlen, Christoph
N1 - Publisher Copyright:
© 2023, The Author(s), under exclusive license to Springer Nature Switzerland AG.
PY - 2023
Y1 - 2023
N2 - The durability of a concrete structure ultimately depends on the quality of the cast concrete, whereby especially the edge zone of the manufactured concrete segments is crucial for environmental exposures. In order to ensure that the concrete provides sufficient resistance to these exposures, the corresponding material properties must be quantified according to the so-called performance-based durability design. However, the quantification of these properties is carried out using mainly standardized concrete test specimens, cast and cured under optimized laboratory conditions. On the other hand, the real structure is built under different in situ and curing conditions. This may lead to a deviation of the concrete properties achieved at the construction site in contrast to those determined in the laboratory. In this context, systematic investigations were conducted to assess this deviation. To accomplish the studies, separately manufactured test specimens, as well as dummy walls (4 m2), were cast at different construction sites. The separately manufactured test specimens were cured in the laboratory following current standards. The wall was cured in its formwork for a defined number of days (mostly 7 days). Subsequently, drill cores were taken and compared to the laboratory samples in terms of the corresponding material properties (compressive strength, chloride migration and carbonation rate of the concrete). As a result, the core drill samples underperformed the laboratory-cured samples, indicating that the performance achieved at the construction site tends to be lower than that of laboratory specimens.
AB - The durability of a concrete structure ultimately depends on the quality of the cast concrete, whereby especially the edge zone of the manufactured concrete segments is crucial for environmental exposures. In order to ensure that the concrete provides sufficient resistance to these exposures, the corresponding material properties must be quantified according to the so-called performance-based durability design. However, the quantification of these properties is carried out using mainly standardized concrete test specimens, cast and cured under optimized laboratory conditions. On the other hand, the real structure is built under different in situ and curing conditions. This may lead to a deviation of the concrete properties achieved at the construction site in contrast to those determined in the laboratory. In this context, systematic investigations were conducted to assess this deviation. To accomplish the studies, separately manufactured test specimens, as well as dummy walls (4 m2), were cast at different construction sites. The separately manufactured test specimens were cured in the laboratory following current standards. The wall was cured in its formwork for a defined number of days (mostly 7 days). Subsequently, drill cores were taken and compared to the laboratory samples in terms of the corresponding material properties (compressive strength, chloride migration and carbonation rate of the concrete). As a result, the core drill samples underperformed the laboratory-cured samples, indicating that the performance achieved at the construction site tends to be lower than that of laboratory specimens.
KW - carbonation
KW - chloride migration
KW - durability
KW - performance in the structure
KW - performance-based design
UR - http://www.scopus.com/inward/record.url?scp=85162174375&partnerID=8YFLogxK
U2 - 10.1007/978-3-031-33211-1_69
DO - 10.1007/978-3-031-33211-1_69
M3 - Chapter
AN - SCOPUS:85162174375
T3 - RILEM Bookseries
SP - 764
EP - 774
BT - RILEM Bookseries
PB - Springer Science and Business Media B.V.
ER -