This contribution presents the preliminary results of a research project named Calci DOC, included in the activities of Forum Italiano Calce. The aim of this project is to realise a database of the raw materials used in the Italian regions for the production of traditional lime. The project was born in Tuscany with the collection of different stones that from Middle Age up to the last century have been utilized for the production of lime and natural hydraulic lime. The project has two purposes: from one side to identify the carbonate rocks, usually outcropping in the neighbourhood of the furnaces, and to fit them into the geology of the region. From the other side we want to assess the relationship among the chemical, mineralogical and physical properties of these carbonate materials and the type and quality of lime that was produced. Concerning Tuscany pure Apuan calcitic marbles with different microstructures, pure limestones, marly limestones and other carbonate lithotypes have been utilised in the past centuries. A standardised processing of the carbonatic stone materials was followed: burning temperature, burning time slaking, aging of the lime putty, time of setting of the lime putty. All samples were preliminarily characterised from the chemical (X ray fluorescence), mineralogical (X ray diffraction, Thermo gravimetric analyses TGA), petrographical and physical (OM and porosimetry techniques) point of view. The colorimetric coordinates expressed in CIElab system were measured with a Minolta colorimeter on the rock samples and on the hardened binder samples. After the setting of the lime putties, during carbonation, at time intervals, mineralogical controls (XRD) and SEM EDS morphological observations on polished and fractured surfaces were performed. The hardness of the binder samples was measured with a Drilling Resistance Measurement System (DRMS). The obtained drilling resistance can be put in relation to the compressive strength of material. In particular for the Alberese marly limestone, the stone used in the Florentine area for the production of lime, the role of structure, porosity and different amount of clay minerals in controlling the development of calcium silico aluminate has been investigated. A comparison with the characteristics of the marly limestone from the Chartreuse Massif used in France used for the production of the Roman cement (or Prompt Natural Cement) is proposed.

Influence of raw materials on the quality of traditional lime binders / Cantisani E.; Camaiti M.; Falabella A.; Fratini F.; Pecchioni E.. - In: EPITOME. - ISSN 1972-1552. - STAMPA. - (2011), pp. 331-332. (Intervento presentato al convegno FIST-Geoitalia tenutosi a Torino nel 19-23 Settebre 2011).

Influence of raw materials on the quality of traditional lime binders

PECCHIONI, ELENA
2011

Abstract

This contribution presents the preliminary results of a research project named Calci DOC, included in the activities of Forum Italiano Calce. The aim of this project is to realise a database of the raw materials used in the Italian regions for the production of traditional lime. The project was born in Tuscany with the collection of different stones that from Middle Age up to the last century have been utilized for the production of lime and natural hydraulic lime. The project has two purposes: from one side to identify the carbonate rocks, usually outcropping in the neighbourhood of the furnaces, and to fit them into the geology of the region. From the other side we want to assess the relationship among the chemical, mineralogical and physical properties of these carbonate materials and the type and quality of lime that was produced. Concerning Tuscany pure Apuan calcitic marbles with different microstructures, pure limestones, marly limestones and other carbonate lithotypes have been utilised in the past centuries. A standardised processing of the carbonatic stone materials was followed: burning temperature, burning time slaking, aging of the lime putty, time of setting of the lime putty. All samples were preliminarily characterised from the chemical (X ray fluorescence), mineralogical (X ray diffraction, Thermo gravimetric analyses TGA), petrographical and physical (OM and porosimetry techniques) point of view. The colorimetric coordinates expressed in CIElab system were measured with a Minolta colorimeter on the rock samples and on the hardened binder samples. After the setting of the lime putties, during carbonation, at time intervals, mineralogical controls (XRD) and SEM EDS morphological observations on polished and fractured surfaces were performed. The hardness of the binder samples was measured with a Drilling Resistance Measurement System (DRMS). The obtained drilling resistance can be put in relation to the compressive strength of material. In particular for the Alberese marly limestone, the stone used in the Florentine area for the production of lime, the role of structure, porosity and different amount of clay minerals in controlling the development of calcium silico aluminate has been investigated. A comparison with the characteristics of the marly limestone from the Chartreuse Massif used in France used for the production of the Roman cement (or Prompt Natural Cement) is proposed.
2011
Epitome
FIST-Geoitalia
Torino
Cantisani E.; Camaiti M.; Falabella A.; Fratini F.; Pecchioni E.
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Utilizza questo identificatore per citare o creare un link a questa risorsa: https://hdl.handle.net/2158/675380
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