Tremolite group minerals could be present in the aggregate used as filler in the mix asphalt floor in the road surfaces and are subject to wear for vehicular traffic and materials ageing.Dust produced by the degradati...Tremolite group minerals could be present in the aggregate used as filler in the mix asphalt floor in the road surfaces and are subject to wear for vehicular traffic and materials ageing.Dust produced by the degradation of asphalt surfaces can disperse tremolite group minerals present in road paving causing exposure by asbestos fiber to an increasing number of people and animals.In recent years,attention has been focused on naturally occurring asbestos(NOA)as the greatest frequency of lung cancer has been observed in environments characterized by rocks and soils rich in Tremolite that characterize asbestos minerals.Asphalt samples object of this study were collected in a motorway segment of the Lombardia Region(north of Italy)for an exposure assessment research on road paving workers.The evaluation was performed using a metrological approach based on petrographic and mineralogical analyses in order to reduce the epidemiologic risks and to define the best treatment strategies on waste management with sustainable costs in fulfilment of Council Directive 67/548/EEC(1967)and EC Regulation 1272/2008(2008)(Paglietti et al.,2016).The fibers are generally not broken down to other compounds in the environment,but asbestos hazard could be related to the occurrence of tremolite fiber in road paving arises when natural weathering processes(e.g.,erosion)or human activities(e.g.,continuous passage of motorized vehicles)separate and break down the fibers,which could be lost into the environment as airborne and easily penetrate into the human respiratory tract(Punturo et al.,2019).Despite this,this work is not an epidemiological risk analysis but obtained data could be useful to other specialists to define the exposure risks.展开更多
At the beginning of the twentieth century,artificial stones became commonly used as structural building materials,masonry materials,and architectural decorative elements.The main purpose of this work was to characteri...At the beginning of the twentieth century,artificial stones became commonly used as structural building materials,masonry materials,and architectural decorative elements.The main purpose of this work was to characterize the building materials used in a historical building in Codigoro,a small town near Ferrara,northeastern Italy.This building was constructed according to the Italian rationalist rules for monumental architecture and is an example of the rationalist architecture found in rural villages,which uses innovative materials and decorations including artificial stone.The samples analyzed in this work were imitation natural stone,such as“fake travertine”and“fake Ceppo di Grè”,composed of reinforced concrete slabs coated with white mortar.Asbestos minerals have been observed in the fillers in these materials.Petrographic,mineralogical,and chemical characterization of samples of artificial stones and concrete was performed with optical transmitted light microscopy,scanning electron microscopy–energy dispersive spectroscopy,and X-ray diffraction analyses.The results revealed chemical and biological degradation in almost all the artificial stones examined and enabled identification of the presence of calcite,iron oxychloride complexes,and asbestos lizardites used as fillers in two of the analyzed samples.This study aimed to describe a general investigation methodology used to examine the artificial stone façades of the Ex Casa del Fascio of Codigoro,whose architecture is particularly representative of the rationalist architecture in rural villages.The results highlight the relevance of compatible and suitable conservation measures that should be monitored during all restoration interventions to minimize post-degradation fracturing and transformation into elements harmful to human health and the environment.展开更多
文摘Tremolite group minerals could be present in the aggregate used as filler in the mix asphalt floor in the road surfaces and are subject to wear for vehicular traffic and materials ageing.Dust produced by the degradation of asphalt surfaces can disperse tremolite group minerals present in road paving causing exposure by asbestos fiber to an increasing number of people and animals.In recent years,attention has been focused on naturally occurring asbestos(NOA)as the greatest frequency of lung cancer has been observed in environments characterized by rocks and soils rich in Tremolite that characterize asbestos minerals.Asphalt samples object of this study were collected in a motorway segment of the Lombardia Region(north of Italy)for an exposure assessment research on road paving workers.The evaluation was performed using a metrological approach based on petrographic and mineralogical analyses in order to reduce the epidemiologic risks and to define the best treatment strategies on waste management with sustainable costs in fulfilment of Council Directive 67/548/EEC(1967)and EC Regulation 1272/2008(2008)(Paglietti et al.,2016).The fibers are generally not broken down to other compounds in the environment,but asbestos hazard could be related to the occurrence of tremolite fiber in road paving arises when natural weathering processes(e.g.,erosion)or human activities(e.g.,continuous passage of motorized vehicles)separate and break down the fibers,which could be lost into the environment as airborne and easily penetrate into the human respiratory tract(Punturo et al.,2019).Despite this,this work is not an epidemiological risk analysis but obtained data could be useful to other specialists to define the exposure risks.
文摘At the beginning of the twentieth century,artificial stones became commonly used as structural building materials,masonry materials,and architectural decorative elements.The main purpose of this work was to characterize the building materials used in a historical building in Codigoro,a small town near Ferrara,northeastern Italy.This building was constructed according to the Italian rationalist rules for monumental architecture and is an example of the rationalist architecture found in rural villages,which uses innovative materials and decorations including artificial stone.The samples analyzed in this work were imitation natural stone,such as“fake travertine”and“fake Ceppo di Grè”,composed of reinforced concrete slabs coated with white mortar.Asbestos minerals have been observed in the fillers in these materials.Petrographic,mineralogical,and chemical characterization of samples of artificial stones and concrete was performed with optical transmitted light microscopy,scanning electron microscopy–energy dispersive spectroscopy,and X-ray diffraction analyses.The results revealed chemical and biological degradation in almost all the artificial stones examined and enabled identification of the presence of calcite,iron oxychloride complexes,and asbestos lizardites used as fillers in two of the analyzed samples.This study aimed to describe a general investigation methodology used to examine the artificial stone façades of the Ex Casa del Fascio of Codigoro,whose architecture is particularly representative of the rationalist architecture in rural villages.The results highlight the relevance of compatible and suitable conservation measures that should be monitored during all restoration interventions to minimize post-degradation fracturing and transformation into elements harmful to human health and the environment.
