A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
On reliable predicting risk and nature of thermal spalling in heated concrete
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.
On reliable predicting risk and nature of thermal spalling in heated concrete
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.
On reliable predicting risk and nature of thermal spalling in heated concrete
Archiv.Civ.Mech.Eng
Gawin, Dariusz (author) / Pesavento, Francesco (author) / Castells, Angel Guerrero (author)
Archives of Civil and Mechanical Engineering ; 18 ; 1219-1227
2018-12-01
9 pages
Article (Journal)
Electronic Resource
English
On reliable predicting risk and nature of thermal spalling in heated concrete
| British Library Online Contents | 2018
The spalling of heated concrete: Comparison between thermal and hydraulic spalling
| British Library Conference Proceedings | 2005
Experimental investigation on spalling mechanisms in heated concrete
| British Library Conference Proceedings | 2007
Spalling of heated high performance concrete due to thermal and hygric gradients
| BASE | 2016
Comparison between Hydraulic and Thermal Spalling in Heated Concrete Based on Numerical Modeling
| Online Contents | 2007