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 The selected fractions were analyzed by the accelerator mass spectrometry (AMS) 14C technique and compared to known historical references.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.

Radiocarbon dating of mortars with a pozzolana aggregate using the Cryo2SoniC protocol to isolate the binder / Nonni, Sara; Marzaioli, Fabio; Mignardi, Silvano; Passariello, Isabella; Capano, Manuela; Terrasi, Filippo. - In: RADIOCARBON. - ISSN 0033-8222. - STAMPA. - 60:2(2018), pp. 617-637. [10.1017/RDC.2017.116]

Radiocarbon dating of mortars with a pozzolana aggregate using the Cryo2SoniC protocol to isolate the binder

Sara Nonni
Writing – Original Draft Preparation
;
Silvano Mignardi
Supervision
;
2018

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 The selected fractions were analyzed by the accelerator mass spectrometry (AMS) 14C technique and compared to known historical references.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.
2018
Cryo2SoniC; mortar, pozzolana; radiocarbon AMS dating; SEM
01 Pubblicazione su rivista::01a Articolo in rivista
Radiocarbon dating of mortars with a pozzolana aggregate using the Cryo2SoniC protocol to isolate the binder / Nonni, Sara; Marzaioli, Fabio; Mignardi, Silvano; Passariello, Isabella; Capano, Manuela; Terrasi, Filippo. - In: RADIOCARBON. - ISSN 0033-8222. - STAMPA. - 60:2(2018), pp. 617-637. [10.1017/RDC.2017.116]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/1107331
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