A great number of medieval religious buildings of remarkable historic and artistic significance are located in the city centre of L'Aquila. A so high-density of buildings arises economical and methodological difficulties on their conservation. Objective of the paper is to identify and to characterize the stones used in the medieval religious architecture and to evaluate their state of conservation .The stones have been characterised using several techniques both in situ and in laboratory (Fiber Optics Microscopy , "pipette method", LM, SEM-EDS, XRD, MIP, AAS, mechanical and ultrasonic tests).A methodology based on rock decay, water absorption and macroscopic description, have been tested for the classification of the stone typologies. For the identification of the old quarries, historic documents, regional geologic maps, aerial photos, as well as field inspections, have been adopted.The characteristics of the stone sampled in the ancient quarries have been compared with those obtained from monuments, both have been pointed out with the same methodologies above mentioned. The quarries are located around the city centre (10-15 kilometres)and several have been identified inside the urban perimeter. "White or reddish" limestone have been classified in ten groups. The white ones have mechanical resistances lower than reddish stones (50-60Mpa with respect to 100Mpa). On the contrary the compactness as well as the workability is very high.The workability depends on the characteristics of the lithotype and its geological history. The stone decay is greater for the reddish limestone. This is due to the presence of clay and iron minerals finely dispersed and how the stone have been located building the architectonic elements (ashlars, column, etc.). In fact the reddish stone, which is macroscopic layered, has been used,in order to obtain a homogenous colour, with the stratigraphic plans parallel to the loads.Many quoted old quarries have been identified and new ones have been discovered. It has been so possible to carried out those destructive analyses, or collect new samples, with the goal to obtain a new characterization of the stone properties. These data, as well as the study of the decay forms, allow to plan properly conservative works.

Quaresima, R., Giampaolo, C., Taglieri, G., Adanti, B., LO MASTRO, S., Volpe, R. (2004). Properties and weathering of the stones used in the medioevale religious architecture in L'aquila (Italy)..

Properties and weathering of the stones used in the medioevale religious architecture in L'aquila (Italy).

GIAMPAOLO, Ciriaco;
2004-01-01

Abstract

A great number of medieval religious buildings of remarkable historic and artistic significance are located in the city centre of L'Aquila. A so high-density of buildings arises economical and methodological difficulties on their conservation. Objective of the paper is to identify and to characterize the stones used in the medieval religious architecture and to evaluate their state of conservation .The stones have been characterised using several techniques both in situ and in laboratory (Fiber Optics Microscopy , "pipette method", LM, SEM-EDS, XRD, MIP, AAS, mechanical and ultrasonic tests).A methodology based on rock decay, water absorption and macroscopic description, have been tested for the classification of the stone typologies. For the identification of the old quarries, historic documents, regional geologic maps, aerial photos, as well as field inspections, have been adopted.The characteristics of the stone sampled in the ancient quarries have been compared with those obtained from monuments, both have been pointed out with the same methodologies above mentioned. The quarries are located around the city centre (10-15 kilometres)and several have been identified inside the urban perimeter. "White or reddish" limestone have been classified in ten groups. The white ones have mechanical resistances lower than reddish stones (50-60Mpa with respect to 100Mpa). On the contrary the compactness as well as the workability is very high.The workability depends on the characteristics of the lithotype and its geological history. The stone decay is greater for the reddish limestone. This is due to the presence of clay and iron minerals finely dispersed and how the stone have been located building the architectonic elements (ashlars, column, etc.). In fact the reddish stone, which is macroscopic layered, has been used,in order to obtain a homogenous colour, with the stratigraphic plans parallel to the loads.Many quoted old quarries have been identified and new ones have been discovered. It has been so possible to carried out those destructive analyses, or collect new samples, with the goal to obtain a new characterization of the stone properties. These data, as well as the study of the decay forms, allow to plan properly conservative works.
2004
Quaresima, R., Giampaolo, C., Taglieri, G., Adanti, B., LO MASTRO, S., Volpe, R. (2004). Properties and weathering of the stones used in the medioevale religious architecture in L'aquila (Italy)..
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11590/272831
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