Influence of limestone fillers on combustion characteristics of asphalt mortar for pavements

Wu Ke, Zhu Kai, Hao Wu, Han Jun, Wang Jin-Chang, Huang Zhi-Yi, Liang Pei

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Asphalt materials will be ignited and release significant toxic fumes within tunnel fires. Thus, combustion characteristics of asphalt materials used in road tunnel should be studied in order to limit such an adverse effect. In the present work we study the influence of limestone fillers on combustion characteristics of asphalt mortar by thermogravimetric and kinetic analysis. It is shown that the combustion of asphalt mortar is not just a linear superposition of asphalt and limestone. The limestone will increase the ignition point and the activation energy of the primary volatile release, and will catalyze the char formation from the primary volatile release. Kinetic analysis shows that the primary volatile release stage of asphalt mortar combustion can be explained by a three-dimensional diffusion model, the secondary volatile release and char combustion stage can be explained by a model under the assumption of random nucleation and nuclei growth, whereas the limestone decomposition stage appears to follow the one-dimensional phase boundary model.
Original languageEnglish
Article number074703
JournalChinese Physics B
Volume23
Issue number7
Number of pages6
ISSN1674-1056
DOIs
Publication statusPublished - 2014

Keywords

  • Asphalt mortar
  • Limestone
  • Combustion
  • Kinetic analysis

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