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Copyright of Conservar Património is the property of Associacao Profissional de Conservadores-Restauradores de Portugal and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

The gypsum mineral is the most common sulfated ore existing in nature – its chemical formula is CaSO4.2H2O – which has been formed by the evaporation of ocean water during million years. In Cuba there are three gypsum mineral deposits where gypsum beta hemihydrates are mainly produced. Itis used in construction works and modeling and in cement production. This paper aims at doing a chemical and physical characterization of gypsum mineral existing in the mines located in the region Canasi in Matanzas province with the view to assessing its use for obtaining gypsum alpha hemihydrates for special uses, which are deficit products imported at high cost in the country. For this characterization to be carried out at laboratory and industrial scale, the research field was divided into several areas for assessing individual purities –enabling to mix one another in a way that meet the required quality of the product in a determined temperature range. The mine has a great potential for obtaining special gypsum that meet all international quality standards which would allow the country to substitute imports and to fully meet national requirements by building a valuable export. The research proved the gypsum from this mine to be especially fast by nature. [ABSTRACT FROM AUTHOR]

Since distant times gypsum has coexisted alongside with the humanity and it is one of the oldest building materials. It is also used in decoration works, medicine and light industry. The quality of gypsum products manufactured with high technology in other countries makes of gypsum a valuable material due to its cost-effective production. Although Cuba has this prized resource, there are not short-term investment plans in sight, thus there are not real perspectives for its exploitation. In this paper, the current national status of gypsum production is analyzed and the potentialities and development of the material are assessed. The implementation of cutting-edge technologies would definitely help achieve high-quality productions so as to build a worldwide competitive gypsum industry. It has been proven that gypsum mineral extracted from Matanzas mines can be used to manufacture all gypsum types: construction, modeling and special gypsums. Thus, special gypsum import could be replaced by a national raw material and the growing needs of the potential tourist industry would be met. This product is in demand in health care system as dental and orthopedic plaster and in agriculture as soil neutralizing fertilizer. The country would have an opportunity for competition in the international market where special gypsum is in high demand. Such productions would have great impact in the domestic economy by contributing to obtain new export rubles. [ABSTRACT FROM AUTHOR]

Copyright of DYNA - Ingeniería e Industria is the property of Publicaciones Dyna SL and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of DYNA - Ingeniería e Industria is the property of Publicaciones Dyna SL and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

The mineral gypsum has been used since antiquity. From ancient times. gypsum has coexisted with mankind, being one of the oldest building materials. Main uses of this material include construction, decoration, medicine and light industry. The quality of gypsum products, manufactured in other countries with modern technology has made gypsum to acquire a great value of use, due to its economic production. This paper reviews the current status of gypsum production in Cuba. The potential of production and development prospects and drawing comparisons in relation to global production are also analyzed. Forms of exploitation of gypsum mines, production methods and manufacturing technology products must be modernized for reaching a competitive gypsum industry in Cuba. This approach will provide quality products for a potential Cuban tourist industry as well as other necessary productions for health system such as dental and orthopedic plaster casts. A concurrence to the international market where gypsum and byproducts are greatly requested must be possible thus having a valuable impact on Cuban economy for contributing to new export items. [ABSTRACT FROM AUTHOR]

At present the existing environmental pollution also affect health, has also affected the surface degradation of the materials used in buildings. The old stone-built structures were locked in some urban areas with minimal or almost no industrial development. Today these buildings are located in highly urbanized and industrialized areas and the stone material, with which they were erected, is affected by chemical pollutants emitted by industries and the heavy road traffic. The Basilica Minor San Francisco de Asis and Convent seventeenth century and is located in Old Havana. This monument is located in urban-industrial-marine area and on the surface of the stone used in its construction, evidenced the formation of crusts and patinas as a result of pollution. Materials and Methods: In this paper we show the values of NO2 and sulphates monitored inside the building using passive sensors. On the other hand, was implemented and evaluated by Karsten Pipe, visual and microscopic observation an organic-based repellent to protect the stone surface. Results and Conclusions: The capacity of the products to decrease water access inside the stone was confirmed. Gypsum is the majority of the crust contaminant present in the stone surface. [ABSTRACT FROM AUTHOR]

At present the existing environmental pollution also affect health, has also affected the surface degradation of the materials used in buildings. The old stone-built structures were locked in some urban areas with minimal or almost no industrial development. Today these buildings are located in highly urbanized and industrialized areas and the stone material, with which they were erected, is affected by chemical pollutants emitted by industries and the heavy road traffic. The Basilica Minor San Francisco de Asis and Convent seventeenth century and is located in Old Havana. This monument is located in urban-industrial-marine area and on the surface of the stone used in its construction, evidenced the formation of crusts and patinas as a result of pollution. Materials and Methods: In this paper we show the values of NO2 and sulphates monitored inside the building using passive sensors. On the other hand, was implemented and evaluated by Karsten Pipe, visual and microscopic observation an organic-based repellent to protect the stone surface. Results and Conclusions: The capacity of the products to decrease water access inside the stone was confirmed. Gypsum is the majority of the crust contaminant present in the stone surface. [ABSTRACT FROM AUTHOR]

Copyright of Boletín de la Sociedad Geológica Mexicana is the property of Sociedad Geologica Mexicana and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)