Using Micro-Scale and Solid Material Data for Modelling Heat Transfer in Stone Wool Composites Under Heat Exposures

Abstract

Modelling capabilities have drastically improved in the last decade. However, in most of the cases the fire response of building elements is predicted by fitting input material properties to the models in order to match test data. This paper presents models developed to predict the unexposed side temperature of stone wool layered composites with stainless steel or gypsum claddings exposed to severe heat conditions. The suitability of material thermal properties from literature and reaction kinetic parameters obtained at bench scale (e.g. thermogravimetric analysis, bomb calorimeter, slug test) to model composites at different heat exposures is studied. Modelling efforts include: (1) the combustion of the organic content of the wool, (2) diffusion term to account for the passage of hot air through the wool, (3) calcination reactions in the gypsum plasterboard, (4) energy released by burning of the paper lining of gypsum plasterboard. The models are compared against experimental data. Results show that material thermal properties of gypsum plasterboard and stone wool retrieved from the literature and obtained at a bench scale provide accurate model predictions under different heat exposures. Furthermore, reactions schemes for the dehydration of gypsum plasterboard and organic content combustion in the wool also provide good modelling results. Further analysis is necessary to understand the environmental conditions inside the layered composites in fire exposures in order to achieve better modelling predictions.

Determination of Thermal Properties of Mineral Wool Required for the Safety Analysis of Sandwich Panels Subjected to Fire Loads

“…The authors reported two exothermic peaks and attributed them to the burning of the binder and crystallization of the amorphous material. The thermal behavior of mineral wool was investigated and modelled in [11,12]. In [11], a multiphysics model of heat and mass transfer coupled with the chemical decomposition of the organic content was developed while in [12] models for predicting the temperature of the unexposed side of sandwich composites made of mineral wool with a stainless steel or plasterboard cladding were presented.…”

Experimental Investigation of the Effects of Insulation Materials and Concrete Strength on Temperature Transitions in FRP Reinforced Structural Elements Under High Temperature

“…Genellikle yangınların sonraki aşamalarında yapının deformasyonları, alçı levhaların çatlaması ve düşmesi göçme sürelerini belirlemektedir [15]. Sayısal çalışmaların çoğu, esas olarak GPB'nin termal davranışına odaklanmakla [16][17][18] birlikte, GPB'nin yüksek sıcaklıklarda mekanik özellikleri hakkında yalnızca sınırlı sayıda çalışma vardır [19][20][21]. Alçıdan imal edilen iki tarafı kağıtla kaplı olan alçıpanların bir çeşidi olan kırmızı alçıpan yangına karşı dayanım istenen yerlerde kullanılmaktadır.…”