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Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Progressive Weakening of Granite by Piezoelectric Excitation of Quartz with Alternating Current
https://orcid.org/0000-0002-8723-5798
https://orcid.org/0000-0003-1374-4386
https://orcid.org/0000-0003-1979-427X
https://orcid.org/0000-0002-6310-7820
https://orcid.org/0000-0001-9486-3621
https://orcid.org/0000-0001-9069-9246
https://orcid.org/0000-0002-3793-2720
AbstractA promising solution to reduce energy usage and mitigate the wear of drilling and comminution tools during mining operations involves inducing vibrations within the piezoelectric phases dispersed in the structure of rocks using alternating current (AC). This paper presents experimental evidence of AC-induced weakening of Kuru granite, manifested as improvements in rock drillability and reductions of strength. Sievers’ J-miniature drill tests were used to assess surface drillability. The impact of AC treatment on the quasi-static strength of granite was assessed via three-point bending and indirect tension Brazilian disk tests. The influence of AC treatment on the dynamic tensile strength of the rock was determined using split Hopkinson bar tests, with the fragmentation process captured using in situ ultra-fast synchrotron X-ray phase contrast imaging. The quasi-static tests revealed no reduction in rock strength after the AC treatment. In contrast, reductions of 25% in hardness and 18% in dynamic tensile strength were observed. Fragmentation patterns differed between treated and non-treated rocks, with treated specimens exhibiting reduced macrocrack formation during loading.
Progressive Weakening of Granite by Piezoelectric Excitation of Quartz with Alternating Current
https://orcid.org/0000-0002-8723-5798
https://orcid.org/0000-0003-1374-4386
https://orcid.org/0000-0003-1979-427X
https://orcid.org/0000-0002-6310-7820
https://orcid.org/0000-0001-9486-3621
https://orcid.org/0000-0001-9069-9246
https://orcid.org/0000-0002-3793-2720
AbstractA promising solution to reduce energy usage and mitigate the wear of drilling and comminution tools during mining operations involves inducing vibrations within the piezoelectric phases dispersed in the structure of rocks using alternating current (AC). This paper presents experimental evidence of AC-induced weakening of Kuru granite, manifested as improvements in rock drillability and reductions of strength. Sievers’ J-miniature drill tests were used to assess surface drillability. The impact of AC treatment on the quasi-static strength of granite was assessed via three-point bending and indirect tension Brazilian disk tests. The influence of AC treatment on the dynamic tensile strength of the rock was determined using split Hopkinson bar tests, with the fragmentation process captured using in situ ultra-fast synchrotron X-ray phase contrast imaging. The quasi-static tests revealed no reduction in rock strength after the AC treatment. In contrast, reductions of 25% in hardness and 18% in dynamic tensile strength were observed. Fragmentation patterns differed between treated and non-treated rocks, with treated specimens exhibiting reduced macrocrack formation during loading.
Progressive Weakening of Granite by Piezoelectric Excitation of Quartz with Alternating Current
https://orcid.org/0000-0002-8723-5798
https://orcid.org/0000-0003-1374-4386
https://orcid.org/0000-0003-1979-427X
https://orcid.org/0000-0002-6310-7820
https://orcid.org/0000-0001-9486-3621
https://orcid.org/0000-0001-9069-9246
https://orcid.org/0000-0002-3793-2720
AbstractA promising solution to reduce energy usage and mitigate the wear of drilling and comminution tools during mining operations involves inducing vibrations within the piezoelectric phases dispersed in the structure of rocks using alternating current (AC). This paper presents experimental evidence of AC-induced weakening of Kuru granite, manifested as improvements in rock drillability and reductions of strength. Sievers’ J-miniature drill tests were used to assess surface drillability. The impact of AC treatment on the quasi-static strength of granite was assessed via three-point bending and indirect tension Brazilian disk tests. The influence of AC treatment on the dynamic tensile strength of the rock was determined using split Hopkinson bar tests, with the fragmentation process captured using in situ ultra-fast synchrotron X-ray phase contrast imaging. The quasi-static tests revealed no reduction in rock strength after the AC treatment. In contrast, reductions of 25% in hardness and 18% in dynamic tensile strength were observed. Fragmentation patterns differed between treated and non-treated rocks, with treated specimens exhibiting reduced macrocrack formation during loading.
Progressive Weakening of Granite by Piezoelectric Excitation of Quartz with Alternating Current
Rock Mech Rock Eng
Rubio Ruiz, Rafael Arturo (Autor:in) / Pournoori, Nazanin (Autor:in) / Isakov, Matti (Autor:in) / Saksala, Timo (Autor:in) / Bjørge, Ruben (Autor:in) / Rack, Alexander (Autor:in) / Lukic, Bratislav (Autor:in) / Cohen, Amitay (Autor:in) / Levi-Hevroni, David (Autor:in) / Kane, Pascal-Alexandre (Autor:in)
Rock Mechanics and Rock Engineering ; 57 ; 7963-7973
01.10.2024
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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