PSI - Issue 43

Available online at www.sciencedirect.com Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2022) 000 – 000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2022) 000 – 000

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ScienceDirect

Procedia Structural Integrity 43 (2023) 107–112

© 2023 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under the responsibility of MSMF10 organizers. © 20 23 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review under the responsibility of MSMF10 organizers. Abstract C ncret with the maximum aggregate size of 8 mm and wat r to cement r tios 0 50, 0.40 and 0.30 were prepa . Mechanical propertie including fracture pr perties were recorded during the first year of ageing. One set of specimens was stored in water and the others were enveloped by foil and left in the laboratory for 28 days. At the age of 28 days, the specimens were measur d by 3D comput d tomography (CT). Some micr cracks wer detected by CT, and their contents were compared wi the mechanical propertie of the concrete . The re ults show nearly the sam mec anica properties of bot the water-cured and the foil-enveloped specimens. Some reasons fo thi be aviour were discussed. The explanation of this phenomenon can help to understand the influence of self-healing on cracks in high-performance concrete. © 20 23 The Authors. Published by Elsevier B.V. This is an ope access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review under the responsibility of MSMF10 organizers. 10th International Conference on Materials Structure and Micromechanics of Fracture Mechanical and Fracture Parameters of Concretes with Different Water to Cement Ratio in Two Different Conditions of Curing Vlastimil Bílek a *, Kamil Soucek b , Filip Khestl a , David Bujdos a , Stanislav Seitl c a Faculty of Civil Engineering, L.Podeste 1875/17, 708 00 Ostrava- Poruba, Czech Republic b Institute of Geonics of the CAS, v.v.i., Studentska 1768, 708 00 Ostrava- Poruba, Czech Republic c Institute of Physics of Materials of the Czech Academy of Sciences, Zizkova 513/22, 616 00 Brno, Czech Republic Abstract Concretes with the maximum aggregate size of 8 mm and water to cement ratios 0.50, 0.40 and 0.30 were prepared. Mechanical properties including fracture properties were recorded during the first year of ageing. One set of specimens was stored in water and the others were enveloped by foil and left in the laboratory for 28 days. At the age of 28 days, the specimens were measured by 3D computed tomography (CT). Some microcracks were detected by CT, and their contents were compared with the mechanical properties of the concretes. The results show nearly the same mechanical properties of both the water-cured and the foil-enveloped specimens. Some reasons for this behaviour were discussed. The explanation of this phenomenon can help to understand the influence of self-healing on cracks in high-performance concrete. 10th International Conference on Materials Structure and Micromechanics of Fracture Mechanical and Fracture Parameters of Concretes with Different Water to Cement Ratio in Two Different Conditions of Curing Vlastimil Bílek a *, Kamil Soucek b , Filip Khestl a , David Bujdos a , Stanislav Seitl c a Faculty of Civ l Engin ering, L.Podeste 1875/17, 708 0 Ostrava- Poruba, Czech Republic b Institute of Geonics of the CAS, v.v.i., Stu ntska 1768, 708 00 Ostrava- Poruba, Czech Republic c Institute of Physics of Materials of the Czech Academy of Sciences, Zizkova 513/22, 616 00 Brno, Czech Republic 1. Introduction Cracks and microcracks are the most common defects which affect the permeability of concrete, and, therefore, also its durability. The cause of microcracking is the shrinkage of concrete. As the sum of the volumes of the cement paste compounds (cement + water) is higher than the sum of hydrated products, the shrinkage and microcrack 1. Introduction Cracks nd microcracks are the most common defects which affe t the perm ability of concrete, and, therefore, also its durability. The cause of microcracking is the s rinkage of concrete. As the sum of t e volumes of the cement paste compounds (cement + water) is higher than the sum of hydrated products, the shrinkage and microcrack Keywords: computed tomography, concrete, fracture parameters, strength, foil, water Keywords: computed tomography, concrete, fracture parameters, strength, foil, water

* Corresponding author. Tel.: +420 602 744 586; E-mail address: vlastimil.bilek@vsb.cz * Correspon ing author. Tel.: +420 602 744 586; E-mail address: vlastimil.bilek@vsb.cz

2452-3216 © 2023 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under the responsibility of MSMF10 organizers. 2452-3216 © 2023 The Authors. Published by Elsevier B.V. This is an ope access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under the responsibility of MSMF10 organizers.

2452-3216 © 2023 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under the responsibility of MSMF10 organizers. 10.1016/j.prostr.2022.12.243