The phisyco-mechanical processes triggering concrete explosive spalling are related to the heat-induced micro- and meso-structural changes. To have new information on concrete properties at the microstructural level, as well as on how concrete spalling sensitivity is affected by polypropylene and steel fibers, and by aggregate type, ordinary and high-performance concretes are investigated in this research project, after being heated to different temperatures. The focus is on the relationship among porosity, vapor permeability, pore pressure and microcracking inside the cementitious matrix. Polypropylene fibers are shown to increase the total porosity, to favor microcracking and to reduce significantly pore pressure, to the advantage of concrete resistance to explosive spalling, whose risk is markedly reduced – or even zeroed.

Concrete spalling sensitivity versus microstructure: preliminary results on the effect of polypropylene fibers

ROSSINO, CHIARA;LO MONTE, FRANCESCO;FELICETTI, ROBERTO;GAMBAROVA, PIETRO GIOVANNI
2013-01-01

Abstract

The phisyco-mechanical processes triggering concrete explosive spalling are related to the heat-induced micro- and meso-structural changes. To have new information on concrete properties at the microstructural level, as well as on how concrete spalling sensitivity is affected by polypropylene and steel fibers, and by aggregate type, ordinary and high-performance concretes are investigated in this research project, after being heated to different temperatures. The focus is on the relationship among porosity, vapor permeability, pore pressure and microcracking inside the cementitious matrix. Polypropylene fibers are shown to increase the total porosity, to favor microcracking and to reduce significantly pore pressure, to the advantage of concrete resistance to explosive spalling, whose risk is markedly reduced – or even zeroed.
2013
Proceedings of the 3rd International Workshop on “Concrete Spalling due to Fire Exposure”
9782759810741
File in questo prodotto:
File Dimensione Formato  
Gambarova_Spalling_Parigi.pdf

Accesso riservato

: Post-Print (DRAFT o Author’s Accepted Manuscript-AAM)
Dimensione 912.31 kB
Formato Adobe PDF
912.31 kB Adobe PDF   Visualizza/Apri

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11311/766052
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 14
  • ???jsp.display-item.citation.isi??? 10
social impact