Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Estimation of Protected Paste Volumes by Dirichlet Tessellation Associated with Point Processes of Air Voids
Hardened cement paste is susceptible to frost damage. The use of an air entrainment agent makes concrete frost durable. This is explained by the presence of the protected paste volume in the vicinity of entrained air voids. In this study, a model using Dirichlet tessellation is proposed to estimate the protected paste volume associated with a random system of real air voids. The characteristic distance for the protection is defined by the ratio of the cumulative polygon tile areas to the entire cement paste. A critical distance is statistically determined by simulating random point patterns. To protect 95% of the paste area, the proposed model suggested that the average distance of about 0.22 mm should be protected at the maximum in a local region where air voids were sparsely present due to random fluctuation. This estimation was almost equivalent to the spacing factor recommended for the moderate exposure condition. This fact explains why the spacing factor has been useful as a safe characteristic distance parameter in determining air contents. The distance equivalent to the spacing factor reflects the most disadvantageous condition that can occur locally in the actual distribution of air voids against frost attack.
Estimation of Protected Paste Volumes by Dirichlet Tessellation Associated with Point Processes of Air Voids
Hardened cement paste is susceptible to frost damage. The use of an air entrainment agent makes concrete frost durable. This is explained by the presence of the protected paste volume in the vicinity of entrained air voids. In this study, a model using Dirichlet tessellation is proposed to estimate the protected paste volume associated with a random system of real air voids. The characteristic distance for the protection is defined by the ratio of the cumulative polygon tile areas to the entire cement paste. A critical distance is statistically determined by simulating random point patterns. To protect 95% of the paste area, the proposed model suggested that the average distance of about 0.22 mm should be protected at the maximum in a local region where air voids were sparsely present due to random fluctuation. This estimation was almost equivalent to the spacing factor recommended for the moderate exposure condition. This fact explains why the spacing factor has been useful as a safe characteristic distance parameter in determining air contents. The distance equivalent to the spacing factor reflects the most disadvantageous condition that can occur locally in the actual distribution of air voids against frost attack.
Estimation of Protected Paste Volumes by Dirichlet Tessellation Associated with Point Processes of Air Voids
RILEM Bookseries
Jędrzejewska, Agnieszka (Herausgeber:in) / Kanavaris, Fragkoulis (Herausgeber:in) / Azenha, Miguel (Herausgeber:in) / Benboudjema, Farid (Herausgeber:in) / Schlicke, Dirk (Herausgeber:in) / Ohyama, Kazuya (Autor:in) / Igarashi, Shin-ichi (Autor:in)
International RILEM Conference on Synergising expertise towards sustainability and robustness of CBMs and concrete structures ; 2023 ; Milos Island, Greece
11.06.2023
11 pages
Aufsatz/Kapitel (Buch)
Elektronische Ressource
Englisch
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