Development of a pyrolysis model for oriented strand board: Part II—Thermal transport parameterization and bench-scale validation

Junhui Gong, Hongen Zhou, Hong Zhu, Conor G. McCoy, Stanislav I. Stoliarov

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

Oriented strand board is a widely used construction material responsible for a substantial portion of the fire load of many buildings. To accurately model oriented strand board fire response, kinetics and thermodynamics of its thermal decomposition and combustion were carefully characterized using milligram-scale testing in part I of this study. In the current work, Controlled Atmosphere Pyrolysis Apparatus II tests were performed on representative gram-sized oriented strand board samples at a range of radiant heat fluxes. An automated inverse analysis of the sample temperature data obtained in these tests was employed to determine the thermal conductivities of the undecomposed oriented strand board and condensed-phase products of its decomposition. A complete pyrolysis model was formulated for this material and used to predict the mass loss rates measured in the Controlled Atmosphere Pyrolysis Apparatus II experiments. These mass loss rate profiles were predicted well with the exception of the second mass loss rate peak observed at 65 kW m−2 of radiant heat flux, which was underpredicted. To further validate the model, cone calorimeter tests were performed on oriented strand board at 25 and 50 kW m−2 of radiant heat flux. The results of these tests, including both mass loss rate and heat release rate profiles, were predicted reasonably well by the model.

Original languageEnglish
Pages (from-to)477-494
Number of pages18
JournalJournal of Fire Sciences
Volume39
Issue number6
DOIs
StatePublished - Nov 2021

Keywords

  • CAPA II
  • OSB
  • ThermaKin
  • cone calorimeter
  • thermal conductivity
  • thermal decomposition

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