Thermal effects on the physical properties of limestone from the Yucatan Peninsula
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Thermal effects on the physical properties of limestone from the Yucatan Peninsula W.S.Gónzalez-Gómez1, J. May-Crespo1, P. Quintana1, A. May-Pat3, F. Avilés3, J. J. AlvaradoGil1, B.O. Ortega2 1
Applied Physics Department, Cinvestav-Unidad Mérida, Carr. Ant. a Progreso km 6, C.P. 97310 Mérida, Yucatán, México. 2 Departamento de Microbiología Ambiental y Biotecnología, Universidad Autónoma de Campeche, Av. Agustín Melgar s/n, Campeche, Campeche 24039, México. 3 Centro de Investigación Científica de Yucatán, Unidad de Materiales, Calle 43, No.130, Col. Chuburná de Hidalgo, CP 97200, Mérida, Yucatán, México. ABSTRACT Rocks are composed of minerals, bounding matrix, cracks and pores. The study of changes in the physical properties of rocks as a function of heat treatment is relevant to various engineering and industrial applications. The effect of thermal damage on the compression, strength, ultimate compression strain, color and loss of mass of two different limestones extracted from the Yucatan Peninsula is studied. Different thermal treatments are applied by heating the sample from room temperature up to 600°C, with steps of 100°C. The results show a high correlation between the heat transport characteristics, mechanical properties, content of organic matter and the presence of carbonates and iron oxides in each type of limestone rock. INTRODUCTION In México there are a variety of historical constructions and archaeological sites built with stones. The limestone is an important raw material to various engineering and industrial applications. The Yucatan Peninsula is a smooth carbonate platform developed from the Cretaceous, Tertiary and Quaternary ages, with a predominantly shallow calcareous soil [1], and different grain sizes, porosities, and textures. The study of changes in the physical properties of rocks as a function of thermal cracking is relevant to various applications. There are several investigations on the mechanism of weathering and degradation kinetics of the Yucatan limestone [2, 3]. However, little is known regarding their mechanical properties and the effect of thermal damage on their physical properties. In the present work, two types of limestone rocks collected in the Yucatan state are characterized to evaluate the correlation among the mineral thermal transformation, the compression properties and the color change of the rocks for different heat treatments. EXPERIMENTAL Description of rock samples The two selected rocks are from quarries of Yucatan state, México, used in the construction industry, named LR (red compact limestone with low porosity) and CH (limestone with different pale beige shades and high porosity). The limestone materials are cut into coupons of 1 cm3 employing a low-speed diamond saw, and the measurements of physical properties such as density, water absorption, water content, and effective porosity, are carried out according to ASTM standard D2216-98 [4]. Tests are repeated 3 times for each rock.
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Heat treatment Seven sets of samples from each rock are prepared. The sa
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