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      Effect study of heat treatment on tensile properties of coarse sandstone

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          Abstract

          Brazilian split experiments were carried out on coarse sandstone, obtained from a coal seam roof passed by the Shihuoshan tunnel in Xinjiang, and treated at different temperatures (room temperature 25 °C and high temperature 100 °C ~ 900 °C). The physical and mechanical characteristics of the samples were studied. The results showed that: after heat treatment, the color of the coarse sandstone samples gradually changed from dark gray to brownish red-pink; the higher the treatment temperature was, the darker the sample color. Microcracks and mineral composition changes occured in the coarse sandstone samples after heat treatment, which decreased the longitudinal wave velocity of the samples. The longitudinal wave velocity of the coarse sandstone samples decreased as a quadratic function of the treatment temperature. With the increase in longitudinal wave velocity, the tensile strength of the samples first increased and then decreased, changing as a quadratic function relationship. After heat treatment, the tensile stress–strain curve of the coarse sandstone could be divided into compaction, elasticity, plasticity, and failure stages. The energy was continuously accumulated in the coarse sandstone before its failure, and it was released suddenly after the failure. With increasing treatment temperature, the cumulative energy in the prepeak stages first increased and then decreased, reaching a maximum value at 500 °C. The prepeak energy and tensile strength of the coarse sandstone samples satisfied a linear function fitting relationship, indicating that a higher tensile strength in the coarse sandstone, led to more accumulated energy in the samples.

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          Experimental study on the variation of physical and mechanical properties of rock after high temperature treatment

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            Physical and Mechanical Properties of Granite After High-Temperature Treatment

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              Physical and micro-structural characteristics of limestone after high temperature exposure

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                Author and article information

                Contributors
                cqyysh@126.com
                jzitwsj@126.com
                zhangjh84@hyit.edu.cn
                wujingke@hyit.edu.cn
                leizhewudi@hyit.edu.cn
                Journal
                Sci Rep
                Sci Rep
                Scientific Reports
                Nature Publishing Group UK (London )
                2045-2322
                20 October 2022
                20 October 2022
                2022
                : 12
                : 17525
                Affiliations
                [1 ]GRID grid.417678.b, ISNI 0000 0004 1800 1941, Faculty of Architecture and Civil Engineering, , Huaiyin Institute of Technology, ; Huai’an, 223001 China
                [2 ]GRID grid.412097.9, ISNI 0000 0000 8645 6375, School of Energy Science and Engineering, , Henan Polytechnic University, ; Jiaozuo, 454003 China
                [3 ]GRID grid.263826.b, ISNI 0000 0004 1761 0489, School of Transportation, , Southeast University, ; Nanjing, 211189 China
                Article
                21164
                10.1038/s41598-022-21164-w
                9585033
                36266297
                192cd434-8ced-4ae9-b95b-1af43f530100
                © The Author(s) 2022

                Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.

                History
                : 9 September 2021
                : 23 September 2022
                Funding
                Funded by: Huai'an Natural Science Research Program
                Award ID: HAB202154
                Award Recipient :
                Funded by: Natural Science Foundation of the Jiangsu Higher Education Institutions of China
                Award ID: 21KJB440001
                Award Recipient :
                Funded by: 2021 "Huaishang Talents Program" Excellent Doctor of the Huai’an Higher Education Institutions
                Award ID: Z302J22516
                Award Recipient :
                Categories
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                © The Author(s) 2022

                Uncategorized
                civil engineering,natural hazards
                Uncategorized
                civil engineering, natural hazards

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