Radiocarbon Dating of Mortars with a Pozzolana Aggregate Using the Cryo2Sonic Protocol to Isolate the Binder - Archive ouverte HAL Access content directly
Journal Articles Radiocarbon Year : 2017

Radiocarbon Dating of Mortars with a Pozzolana Aggregate Using the Cryo2Sonic Protocol to Isolate the Binder

Sara Nonni
  • Function : Author
Fabio Marzaioli
  • Function : Author
Silvano Mignardi
  • Function : Author
Isabella Passariello
  • Function : Author
Filippo Terrasi
  • Function : Author

Abstract

To date, finding a technique able to effectively isolate the carbon signal from the binder of a mortar is still an open challenge. In this paper, the radiocarbon (14C) dating of one of the most challenging and diffuse types of mortar, the one with pozzolana aggregate, is investigated. Eight mortar samples from three archaeological sites near Rome (Italy) underwent a selection process called Cryo2SoniC. The selected fractions were analyzed by the accelerator mass spectrometry (AMS) 14C technique and compared to known historical references. Additional scanning electron microscopy analysis and petrographic investigations were done, respectively, to check the grain size of the fractions selected by Cryo2SoniC, and further, to characterize the original mortar samples. The masses of carbon yielded from the dated fractions were almost half of those released from some aerial mortars. The 14C dating results were accurate for pozzolana mortars, from buried and unburied structures, with calcination relics and small contamination of secondary calcite. A limitation in the purification protocol was observed on samples with a massive contamination of secondary calcite deposition of ground water origin, occluding porosity and substituting up to the 80% of the original binder matrix
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Dates and versions

hal-01683068 , version 1 (29-04-2019)

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Sara Nonni, Fabio Marzaioli, Silvano Mignardi, Isabella Passariello, Manuela Capano, et al.. Radiocarbon Dating of Mortars with a Pozzolana Aggregate Using the Cryo2Sonic Protocol to Isolate the Binder. Radiocarbon, 2017, 60 (2), pp.1 - 21. ⟨10.1017/RDC.2017.116⟩. ⟨hal-01683068⟩
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