Półilościowe pomiary zawartości węglanu wapnia w historycznych zaprawach gipsowych, za pomocą fourierowskiej spektroskopii w podczerwieni

• Autorzy: Koochakzaei Alireza , Mehrabad Mahsa Saidi , Ajorloo Bahram

Identyfikatory

DOI

10.32047/CWB.2023.28.2.1

Warianty tytułu

EN

Semi-quantitative measurement of calcium carbonate in historic gypsum mortars, using diffuse reflectance infrared Fourier transform spectroscopy

• Języki publikacji: PL EN

Abstrakty

PL

Niniejsza praca, wykorzystuje spektroskopię fourierowską w podczerwieni, do półilościowego pomiaru zawartości węglanu wapnia, w historycznych zaprawach gipsowych. Badano 17 próbek historycznych zapraw gipsowych, związanych z Łukiem Alishāha w Tabriz w Iranie, pochodzących z okresu Ilchanidów. W badaniach, zastosowano spektroskopię fourierowską, rozproszonego odbicia w podczerwieni - DRIFTS [ang. diffuse reflectance infrared Fourier transform spectroscopy]. Przygotowano zaprawy gipsowe zawierające od 0 do 6,5% kalcytu i zbadano je za pomocą spektrometru FTIR. Krzywą kalibracji przygotowano na podstawie stosunku intensywności pasma 1485 cm-1, związanego z wibracjami wiązań grup węglanowych w kalcycie do intensywności pasma przy 660 cm-1 odpowiadającego wibracjom grupy siarczanowej w gipsie. Obliczenia zawartości węglanu wapnia w badanych historycznych zaprawach gipsowych pokazują, że jego zawartość mieściła się w zakresie 0,12% do 1,08%. Zgodnie z uzyskanymi wynikami można przyjąć, że ze względu na niewielką ilość węglanu wapnia w zaprawach, węglan dostał się do zapraw, jako zanieczyszczenie z gleby, lub w postaci rozpuszczonych soli. Może to wskazywać, że wbrew początkowym przypuszczeniom na temat niektórych z tych zapraw, mieszanka wapna i gipsu nie była używana, jako główny składnik, w ich produkcji.

EN

This paper uses Fourier transform infrared spectroscopy to semi-quantitatively measure the amount of calcium carbonate in historical gypsum mortars. 17 historical mortar samples related to Arch of Alishāh in Tabriz-Iran, belonging to the Ilkhanid period, were evaluated. The methodology used in this study was diffuse reflectance infrared Fourier transform spectroscopy [DRIFTS]. Gypsum mortars containing 0-6.5% calcite were prepared and analysed using an FTIR spectrometer. The calibration curve was prepared based on the band intensity ratio of 1485 cm-1 related to carbonate vibrations in calcite to 660 cm-1 corresponding to sulphate vibrations in gypsum. Calculating the amount of carbonate in all historical mortars shows the presence of about 0.12 to 1.08% carbonate in gypsum mortar. According to obtained results, it can be acknowledged that due to the meagre amount of carbonate in the mixture of mortars, the existing carbonate has entered the mortar as an impurity through soil or dissolved salts. This can indicate that, contrary to the initial idea about some of these mortars, lime and gypsum mixture was not used as the main component in the making these mortars.

Słowa kluczowe

PL

spektroskopia FTIR; zaprawa historyczna; gips; kalcyt; węglan; Łuk Alishāh; Tabriz; Iran

EN

FTIR spectroscopy; historic mortar; gypsum; calcite; carbonate; Alishāh Arch; Tabriz; Iran

• Wydawca: Fundacja Cement, Wapno, Beton
• Czasopismo: Cement Wapno Beton
• Rocznik: 2023
• Tom: R. 28, nr 2
• Strony: 68--75
• Opis fizyczny: Bibliogr. 29 poz., il., tab.

Twórcy

autor

Koochakzaei Alireza

• Faculty of Cultural Materials Conservation, Tabriz Islamic Art University, Tabriz, I.R. Iran

autor

Mehrabad Mahsa Saidi

• Faculty of Cultural Materials Conservation, Tabriz Islamic Art University, Tabriz, I.R. Iran

autor

Ajorloo Bahram

• Faculty of Cultural Materials Conservation, Tabriz Islamic Art University, Tabriz, I.R. Iran

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