20 documents found, page 1 of 2

Caracterização química, mineralógica e textural das cerâmicas do Bronze Final d...

Este estudo, ainda que preliminar, envolveu a caracterização arqueométrica de cerâmicas atribuíveis a contextos do Bronze Final do Sudoeste, provenientes de escavações arqueológicas levadas a cabo no povoado fortificado do Passo Alto e no povoado aberto de planície da Salsa 3. Estes sítios arqueológicos encontram‐se implantados em áreas geologicamente distintas – gabro‐dioríticas, a Salsa 3, e xistosas, o Passo...

Exploring the potential of cuttlebone waste to produce building lime

The goal of this study is to find a practicable way to recycle cuttlebone waste in the production of lime. It was studied the behavior of calcium oxide obtained from the calcination of this waste at 900, 1000 and 1100 ºC and, after wet slaking, the produced lime was characterized. All the results were compared to calcium oxide or to hydrated lime obtained from commercial limestone. According to the slaking resu...

Recycling Waste Seashells to Produce Calcitic Lime: Characterization and Wet Sl...

The present work aimed at valorizing marine bivalve shells. First, clam, mussel, edible cockle, wedge, razor, oyster, dog cockle and scallop shells wastes were thoroughly characterised for their mineralogical, chemical and thermal properties. Then, the materials were calcined at 1000 °C, milled and sieved to lower than 0.250 mm. The obtained calcium oxide was subjected to wet slaking test to evaluate its reacti...

Estudo tecnológico e composicional da folha de ouro de retábulos barrocos - bas...

Foi estudada a folha de ouro do retábulo-mor da igreja de Jesus em Aveiro, um dos mais interessantes exemplares de talha barroca portuguesa, localizado no actual Museu da Cidade e antigo Convento de Jesus. Efectuaram-se análises qualitativas dos cortes estratigráficos por microscopia óptica e identificaram-se três camadas distintas - preparação branca, bolo e ouro - consistentes com a aplicação de um douramento...

Eggshell waste to produce building lime: calcium oxide reactivity, industrial, ...

Eggshells wastes are produced in huge amounts worldwide. The recycling or valorization of this waste, which otherwise is usually disposed in landfills, represents an opportunity within a circular economy perspective. In the present work, the potential of chicken eggshell waste to produce calcitic lime was explored. After collection from an industry supplier, the waste was thoroughly characterized for its minera...

Caracterização material da escultura de Nossa Senhora de Fátima

The environmental factors impact on the conservation of an historic marine quay...

Changes effected by environmental factors on the biological colonization of an historic marine limestone quay were considered, as a baseline study for the monitoring and test plan definition. Environmental factors play a fundamental role in the deterioration of stone monuments, particularly those located in a marine environment. This eighteenth century quay, situated at the Royal Square of the Portuguese capita...

Deterioration of the “Quinta Nova Torres Vedras” wall tile panel – an analytica...

Wall tile panels were commonly used in recreational open outdoors spaces in 18th Century noble houses I Portugal. The nature of their location and the lack of maintenance of such spaces, which lost their purpose during the 20th century, contributed to their natural deterioration. In order to preserve one such panel and facilitate the conservation treatment, it was removed from its location and transported to th...

Caracterização através de análise química da escultura portuguesa sobre madeira...

Making use of several analytical techniques, four erudite and four popular Portuguese baroque wooden sculptures were studied. The materials and techniques employed were identified and the relationship between their artistic quality and the materials used was investigated. In general, the pigments were common at the time, but one pigment discovered in the beginning of the 18th century and two rare arsenic pigmen...

Spent brewery grains for improvement of thermal insulation of ceramic bricks

One by-product of the brewing process is a waste containing spent grains (barley malt and maize grits). In the brewing process, this cake is composed mainly of organic matter containing high fiber content, provided by the separation of suspended particles through wort filtration. The study presented here was carried out to assess if the spent brewery grains could be recycled through their incorporation in a pas...