CHARACTERISATION OF THERMAL-LOADED CEMENT-BASED COMPOSITES BY COMBINED TIME-LAPSE TOMOGRAPHY AND THE FOUR-POINT BENDING TEST
Quasi-brittle materialslike cement-based composites, rocks,and bricksare subjected to a number ofenvironmental loadings throughout the life cycleof buildings. For instance, fluctuation ofthe ambient temperature (climaticcyclesor fire) causing a variety of physical and chemical transitions...
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| Format: | Article |
| Language: | English |
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Czech Technical University, Prague
2020-04-01
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| Series: | Civil Engineering Journal |
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| Online Access: | http://civilengineeringjournal.cz/archive/issues/2020/2020_1/1-2020-0011-(124-134).pdf |
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| author | Ivana Kumpová Tomáš Fíla Petr Koudelka Iva Rozsypalová Zbyněk Keršner Daniel Kytýř Michal Vopálenský Daniel Vavřík |
| author_facet | Ivana Kumpová Tomáš Fíla Petr Koudelka Iva Rozsypalová Zbyněk Keršner Daniel Kytýř Michal Vopálenský Daniel Vavřík |
| author_sort | Ivana Kumpová |
| collection | DOAJ |
| description | Quasi-brittle materialslike cement-based composites, rocks,and bricksare subjected to a number ofenvironmental loadings throughout the life cycleof buildings. For instance, fluctuation ofthe ambient temperature (climaticcyclesor fire) causing a variety of physical and chemical transitionsresultinginstructural changesand affectingthe mechanical properties. In this work a special mixture containing glass spheres and Portland cement was evaluated by a combination of four-point bending and time-lapse X-ray computed tomographyto verify the feasibility of thisnovel combined method.The effectof temperature on the behavior of investigatedmaterial in terms of sphericity of the present glass spheresand the way of crack propagation under load together with its influenceto mechanical fracture parameterswas studied.The described methodology was used especially to be able to monitor these changes throughout the loading process, asthe characterization of the fracture surface using conventional optical methods is possible only after the complete fractureof the specimenandtotal damage of used material results in loosening of the matrix and filler to such an extent,that the results of these methods may be very distorted.It hasbeen proven that the developed method can be used to characterize the internal structural changes in building materials and thus contribute to the understanding of the fracture processes during mechanical loading.Up to 600°C the glass spheres stay spherical and the crack is propagating through the interfacial transition zone, while at higher temperatures the glass loses its shape and the newly formed pores cause also cracks within the inclusions. The relationship between compressive strength and the maximum loading temperaturewas confirmed |
| first_indexed | 2024-03-12T06:13:31Z |
| format | Article |
| id | doaj.art-330a889ce2154459bf9796bdc3124cff |
| institution | Directory Open Access Journal |
| issn | 1805-2576 |
| language | English |
| last_indexed | 2024-03-12T06:13:31Z |
| publishDate | 2020-04-01 |
| publisher | Czech Technical University, Prague |
| record_format | Article |
| series | Civil Engineering Journal |
| spelling | doaj.art-330a889ce2154459bf9796bdc3124cff2023-09-03T02:46:39ZengCzech Technical University, PragueCivil Engineering Journal1805-25762020-04-012020112413410.14311/CEJ.2020.01.0011CHARACTERISATION OF THERMAL-LOADED CEMENT-BASED COMPOSITES BY COMBINED TIME-LAPSE TOMOGRAPHY AND THE FOUR-POINT BENDING TESTIvana Kumpová0Tomáš Fíla1Petr Koudelka2Iva Rozsypalová3Zbyněk Keršner4Daniel Kytýř5Michal Vopálenský6Daniel Vavřík7Brno University of Technology, Faculty of Civil Engineering, Veveří 331/95, 60200 Brno, Czech RepublicInstitute of Theoretical and Applied Mechanics of the Czech Academy of Sciences, Prosecká 809/76, 19000 Prague 9, Czech RepublicInstitute of Theoretical and Applied Mechanics of the Czech Academy of Sciences, Prosecká 809/76, 19000 Prague 9, Czech RepublicBrno University of Technology, Faculty of Civil Engineering, Veveří 331/95, 60200 Brno, Czech RepublicBrno University of Technology, Faculty of Civil Engineering, Veveří 331/95, 60200 Brno, Czech RepublicInstitute of Theoretical and Applied Mechanics of the Czech Academy of Sciences, Prosecká 809/76, 19000 Prague 9, Czech RepublicInstitute of Theoretical and Applied Mechanics of the Czech Academy of Sciences, Prosecká 809/76, 19000 Prague 9, Czech RepublicInstitute of Theoretical and Applied Mechanics of the Czech Academy of Sciences, Prosecká 809/76, 19000 Prague 9, Czech RepublicQuasi-brittle materialslike cement-based composites, rocks,and bricksare subjected to a number ofenvironmental loadings throughout the life cycleof buildings. For instance, fluctuation ofthe ambient temperature (climaticcyclesor fire) causing a variety of physical and chemical transitionsresultinginstructural changesand affectingthe mechanical properties. In this work a special mixture containing glass spheres and Portland cement was evaluated by a combination of four-point bending and time-lapse X-ray computed tomographyto verify the feasibility of thisnovel combined method.The effectof temperature on the behavior of investigatedmaterial in terms of sphericity of the present glass spheresand the way of crack propagation under load together with its influenceto mechanical fracture parameterswas studied.The described methodology was used especially to be able to monitor these changes throughout the loading process, asthe characterization of the fracture surface using conventional optical methods is possible only after the complete fractureof the specimenandtotal damage of used material results in loosening of the matrix and filler to such an extent,that the results of these methods may be very distorted.It hasbeen proven that the developed method can be used to characterize the internal structural changes in building materials and thus contribute to the understanding of the fracture processes during mechanical loading.Up to 600°C the glass spheres stay spherical and the crack is propagating through the interfacial transition zone, while at higher temperatures the glass loses its shape and the newly formed pores cause also cracks within the inclusions. The relationship between compressive strength and the maximum loading temperaturewas confirmedhttp://civilengineeringjournal.cz/archive/issues/2020/2020_1/1-2020-0011-(124-134).pdffine-grained cement-based compositesquasi-brittle materialx-ray computed tomographyinstrumented four-point bending testcrack path |
| spellingShingle | Ivana Kumpová Tomáš Fíla Petr Koudelka Iva Rozsypalová Zbyněk Keršner Daniel Kytýř Michal Vopálenský Daniel Vavřík CHARACTERISATION OF THERMAL-LOADED CEMENT-BASED COMPOSITES BY COMBINED TIME-LAPSE TOMOGRAPHY AND THE FOUR-POINT BENDING TEST Civil Engineering Journal fine-grained cement-based composites quasi-brittle material x-ray computed tomography instrumented four-point bending test crack path |
| title | CHARACTERISATION OF THERMAL-LOADED CEMENT-BASED COMPOSITES BY COMBINED TIME-LAPSE TOMOGRAPHY AND THE FOUR-POINT BENDING TEST |
| title_full | CHARACTERISATION OF THERMAL-LOADED CEMENT-BASED COMPOSITES BY COMBINED TIME-LAPSE TOMOGRAPHY AND THE FOUR-POINT BENDING TEST |
| title_fullStr | CHARACTERISATION OF THERMAL-LOADED CEMENT-BASED COMPOSITES BY COMBINED TIME-LAPSE TOMOGRAPHY AND THE FOUR-POINT BENDING TEST |
| title_full_unstemmed | CHARACTERISATION OF THERMAL-LOADED CEMENT-BASED COMPOSITES BY COMBINED TIME-LAPSE TOMOGRAPHY AND THE FOUR-POINT BENDING TEST |
| title_short | CHARACTERISATION OF THERMAL-LOADED CEMENT-BASED COMPOSITES BY COMBINED TIME-LAPSE TOMOGRAPHY AND THE FOUR-POINT BENDING TEST |
| title_sort | characterisation of thermal loaded cement based composites by combined time lapse tomography and the four point bending test |
| topic | fine-grained cement-based composites quasi-brittle material x-ray computed tomography instrumented four-point bending test crack path |
| url | http://civilengineeringjournal.cz/archive/issues/2020/2020_1/1-2020-0011-(124-134).pdf |
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