Phase Distribution and Microstructural Changes of Self-Compacting Cement Paste at Elevated Temperature

Self-compacting concrete (SCC), as a new smart building material with various advanced properties, has been used for a wide range of structures and infrastructures. However, little investigation have been reported on the properties of self-compacting when exposed to elevated temperatures. Prior experiments on fire tests have shown the differences between high performance concrete and traditional concrete at elevated temperature. This difference is largely dependent on the microstructural properties of concrete matrix (i.e., the cement paste, especially the porosity, pore size distribution, and connectivity of pores in cement pastes). In this contribution, the investigations are focused on the cement paste. The phase distribution and microstructural changes of self-compacting cement paste (SCCP) at elevated temperatures are examined by mercury intrusion porosimetry and scanning electron microscopy. The chemical decomposition of SCCP at various temperatures is determined by thermogravimetric analysis. The experimental results of SCCP are compared with those of high performance cement paste and traditional cement paste. It was found that SCCP shows a higher change of the total porosity in comparison with high performance cement paste. When the temperature is higher than 700 °C, a dramatic loss of mass was observed in the SCCP samples with addition of limestone filler. This implies that the SCC made by this type of SCCP will probably show larger damage once exposed to fire. Investigation has shown that 0.5 kg/m(sup)3 of polypropylene fibers in the SCCP can avoid the damage efficiently.

  • Availability:
  • Supplemental Notes:
    • Abstract reprinted with permission from Elsevier
  • Authors:
    • Ye, G
    • Liu, X
    • De Schutter, Geert
    • Taerwe, Luc
    • Vandevelde, P
  • Publication Date: 2007-6

Language

  • English

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 01054661
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Jul 30 2007 7:12PM