On reliable predicting risk and nature of thermal spalling in heated concrete

• Autorzy: Gawin D. , Pesavento F. , Castells A. G.

Identyfikatory

DOI

10.1016/j.acme.2018.01.013

• Języki publikacji: EN

Abstrakty

EN

Thermal spalling is a deterioration phenomenon which is of fundamental importance during durability analysis of concrete structures exposed to high temperature, e.g. during a fire. To assess the risk of this damage mechanism for a real concrete structure, numerical simulations are usually applied since experimental tests are very costly. Some aspects related to predicting thermal spalling by means of numerical modelling of chemo-hygro-thermal and damage processes in heated concrete, are presented in this work. First, we propose a spalling index, validate it with some experimental results and show how it can be used in the quantitative assessment of spalling risk. Then, the results of numerical simulations of a slab, made of two types of concrete (NSC and HPC), heated with three different rates, are discussed from the energetic point of view in order to indicate the main physical causes and predict the nature of thermal spalling: slow, rapid or violent. The presented results allow to assess the contribution of energy due to constrained thermal strains and compressed pore gas into the thermal spalling for different types of concrete heated with different rates.

Słowa kluczowe

EN

thermal spalling; heated concrete; numerical simulations; porous media mechanics; energetic analysis

PL

spalanie termiczne; beton; symulacja numeryczna; analiza energetyczna; mechanika płynów

• Wydawca: Springer ; Wrocław University of Science and Technology
• Czasopismo: Archives of Civil and Mechanical Engineering
• Rocznik: 2018
• Tom: Vol. 18, no. 4
• Strony: 1219--1227
• Opis fizyczny: Bibliogr. 26 poz., tab., wykr.

Twórcy

autor

Gawin D.

• Łódź University of Technology, Department of Building Physics and Building Materials, Al. Politechniki 6, 90-924 Łódź, Poland

autor

Pesavento F.

• University of Padova, Department of Civil, Environmental and Architectural Engineering, via Marzolo 9, 35131 Padova, Italy

autor

Castells A. G.

• Ignia, Cl. Aragón 67, Ibiza, Baleares, Spain

Bibliografia

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Uwagi

PL

Opracowanie rekordu w ramach umowy 509/P-DUN/2018 ze środków MNiSW przeznaczonych na działalność upowszechniającą naukę (2019)