Experimental investigation of the effect of quenching cycles on the physico-chemical properties of granites

Junique, Thomas; Vázquez, Patricia; Benavente, David; Thomachot-Schneider, Céline; Géraud, Yves

doi:10.1016/j.geothermics.2021.102235

Cited by 14 publications

(3 citation statements)

References 88 publications

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“…The most significant differences are in the water absorption coefficient (the stone from the sanctuary doubles the value of the one sampled in the quarry), and the compressive strength testing gave higher values in the stone from the quarry. The porosity is slightly higher in the stone from the building and the interpretation is based on the increased volume and connectivity among the pores inside the stone, due to the increased microcracking (Vázquez et al 2010;Junique et al 2021). This slight increase in porosity is also connected to the increase of the water absorption coefficient by capillarity, one of the most important parameters to measure the deterioration process of building stones (Mosquera et al 2000;Ïnce et al 2021).…”

Section: Discussionmentioning

confidence: 99%

The Importance of Preserving Small Heritage Sites: the Case of La Tuiza Sanctuary (Zamora, Spain)

2022

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For centuries, granite has been one of the most widely used natural stones for building heritage, especially in the north of the Iberian Peninsula. The sanctuary of La Tuiza in Lubian (Zamora, northwest of Spain), built with Calabor granite, dates from the eighteenth century and was declared an Asset of Cultural Interest in 1995. The heritage importance of this site lies in its location, on the Sanabria route (Silver Route) of the Way of St James (Camino de Santiago), attracting visitors from all over the world. This work presents the complete characterisation of the building stone of both the monument and the original quarry and the qualitative description of the main pathologies that have been detected. The capillary water absorption coefficient is twice the value in the sanctuary compared to the quarry; the open porosity, water absorption at atmospheric pressure and sound speed propagation are slightly higher, and the compressive strength value is lower in the stones of the building. These differences reveal the incipient decay processes. In terms of pathologies, biological colonisation is scattered throughout the building, affecting the north face more intensely, and on the exterior, scaling is observed on the west face. Inside the sanctuary, deterioration is related to humidity due to capillary water infiltration, which causes conspicuous stains, efflorescence and biological colonisation in the western sidewalls. The authors recommend that measures be taken to prevent further deterioration and to protect this small site in order to maintain the cultural heritage linked to the local community.

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Section: Discussionmentioning

confidence: 99%

The Importance of Preserving Small Heritage Sites: the Case of La Tuiza Sanctuary (Zamora, Spain)

2022

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“…Countless historical quarries exist in the area. These quarries are usually superficial, and their granite is evidencing frequently altered, a yellowish colour (Iñigo et al 2013;Junique et al 2021). Traditionally, the houses of Trás-os-Montes were built on the quarry itself.…”

Section: Geological Settingsmentioning

confidence: 99%

Building Granite Characterisation, Construction Phases, Mason’s Marks and Glyptography of Nossa Senhora de Guadalupe Church, Mouçós e Lamares, Galicia-North Portugal Euroregion

et al. 2023

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The Romanesque church of Nossa Senhora de Guadalupe of Mouçós e Lamares is located in Vila Real (North of Portugal). The exterior part of its nave is preserved almost unaltered. Most of the granite ashlars and corbels that make up this church have a mason’s mark in the centre of their faces. The building granites (Sanguinhedo and Vale das Gatas) have been identified and characterised petrographically and petrophysically. The mason’s marks have been as well identified; all the ashlars with visible mason’s marks have been mapped, and a glyptographic study has been carried out. In addition, the surface roughness of ashlars was measured. All these analyses have made it possible to locate the main historical quarry, to calculate the number of stonemasons who worked in the construction of the church, and to determine its construction phases. There are eight main types of mason’s marks on the nave façades. The quarrymen extracted the main building granite (Sanguinhedo granite) from the same quarry, or from nearby quarries. Although the most experienced stonemason has been identified, most stonemasons worked as a team during all construction phases of the church. Techniques such as petrography, ultrasonic P wave velocity, colourimetry, roughness and the determination of hydric properties will guarantee the quality and durability of the heritage stone for restorations. In addition, the glyptographic analysis revealed important historical and ethnographic findings that will be very useful for the appreciation of the monument. Therefore, the knowledge of built heritage, such as mason’s marks contribute to the conservation of historical quarries and traditions, as well as help understand the close cultural association societies have had with heritage stones. In this way, the scientific corpus of historical-cultural heritage can face for the development of tourism in Galicia-North Portugal Euroregion in a long-lasting sustainable way.

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“…Hu et al 13 found that the increase in the number of quenching cycles reduced the heat transfer capacity of the granite. Junique et al 14 concluded that the porosity, water uptake, size, and volume of cracks increased, while P wave velocity, S wave velocity, and Young’s modulus decreased with the increase of quenching cycles. Xu and Sun 15 investigated the effects of quenching cycles on the tensile strength of granites and determined that the static tensile strength decreased with increasing temperature and quenching cycles.…”

Section: Introductionmentioning

confidence: 99%

Morphological Features of Fractures Developed by Direct Shearing of Intact Granites after Water Cooling Cycles

et al. 2023

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Rock fractures are considered as favorable objects for enhanced geothermal development. The fracture morphologies play an important role in enhanced geothermal development. Therefore, the study of fracture morphologies has a certain guiding significance for the geothermal reservoir. Water cooling and water cooling cycles can change the morphology of fracture surfaces formed by the shear failure of intact granites. To date, however, there is little work on the effect of water cooling and water cooling cycles on the morphology of fracture surfaces formed by direct shearing of intact granites. In this study, the direct shear tests of intact granites treated by water cooling cycles at different temperatures were conducted, and the variations in the laws of shear strength of intact granites and morphologies of fracture surfaces with temperature or cycle times were analyzed. Test results showed that the shear strength and shear stiffness of intact granites decreased nonlinearly with the increase of temperature or cycle times, but the height and apparent dip angle of asperities on the fracture surface increased with the increase of temperature or cycle times, and the overall uniformity of the fracture surface was improved. The height distribution frequency of asperities on fracture surfaces can be divided into four types: right-biased peak type, left-biased peak type, left-biased middle peak, and left-biased flat peak. The asperities on the fracture surface formed by the shearing of intact granites have asymmetric characteristics. The maximum apparent dip angle and average apparent dip angle in the reverse shear direction are larger than those in the shear direction, and the initial contact area ratio between the shear direction and reverse shear direction is in the range of fluctuation between 1.4 and 2.

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Experimental investigation of the effect of quenching cycles on the physico-chemical properties of granites

Cited by 14 publications

References 88 publications

The Importance of Preserving Small Heritage Sites: the Case of La Tuiza Sanctuary (Zamora, Spain)

The Importance of Preserving Small Heritage Sites: the Case of La Tuiza Sanctuary (Zamora, Spain)

Building Granite Characterisation, Construction Phases, Mason’s Marks and Glyptography of Nossa Senhora de Guadalupe Church, Mouçós e Lamares, Galicia-North Portugal Euroregion

Morphological Features of Fractures Developed by Direct Shearing of Intact Granites after Water Cooling Cycles

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