Assessment of residual geogenic carbon in mortars concerning radiocarbon dating

0579547 - ÚTAM 2025 GB eng J - Journal Article
Válek, Jan - Kozlovcev, Petr - Fialová, Anna - Kotková, Kristýna - Frankeová, Dita - Světlík, Ivo - Pachnerová Brabcová, Kateřina
Assessment of residual geogenic carbon in mortars concerning radiocarbon dating.
Radiocarbon. (2023). ISSN 0033-8222. E-ISSN 1945-5755.
[Radiocarbon and 10th Radiocarbon & Archaeology International Conferences /24./. Zürich, 11.09.2022-16.09.2022]
R&D Projects: GA MK(CZ) DG20P02OVV028; GA MŠMT EF16_019/0000728
Keywords : C and O stable isotopes * cathodoluminescence * lime binder * lime processing
OECD category: Materials engineering; Atomic, molecular and chemical physics (physics of atoms and molecules including collision, interaction with radiation, magnetic resonances, Mössbauer effect) (UJF-V)
Impact factor: 8.3, year: 2022
Method of publishing: Limited access
https://doi.org/10.1017/RDC.2023.81

Quicklime samples were collected from six vertical layers (L1–L6) of a feedstock calcined in a traditional single-batch wood-fired kiln and assessed. Three samples were well-burned and three under-burned. The quicklime was slaked in an excess of water and the presence of unburned particles was investigated after settling it into putty. The putty was assessed as bulk and also at three depth levels. Thermal analysis determined the CO2 residua in the quicklime samples. Cathodoluminescence detected individual unburned particles and image analysis was used for their quantification. Settling of the putties led to a considerable reduction of geogenic particles in the layers above the bottom. This was also confirmed by the stable isotope analysis. In the case of the putties made from well-burned quicklime, the δ13C values of samples L4 and L5 ranged from –25.5‰ to –20.5‰ VPDB, and the δ18O values ranged from –17.5‰ to –16.5‰ VPDB. The fractionation was likely affected by the division according to the particle size during the sedimentation. The results of the 14C analysis correlate with the quantified percentage of cathodoluminescent particles.
Permanent Link: https://hdl.handle.net/11104/0348364