SciELO - Scientific Electronic Library Online

 
vol.5 issue1Crystallization Mechanism and Kinetics of BaO-Li2O-ZrO2-SiO2 GlassesSurface Modification of Polymeric Materials by Plasma Treatment author indexsubject indexarticles search
Home Pagealphabetic serial listing  

Services on Demand

Journal

Article

Indicators

Related links

Share


Materials Research

Print version ISSN 1516-1439On-line version ISSN 1980-5373

Abstract

TOLENTINO, Evandro et al. Structural Evaluation and Performance of Portland Cement Concretes After Exposure to High Temperatures. Mat. Res. [online]. 2002, vol.5, n.1, pp.27-36. ISSN 1516-1439.  http://dx.doi.org/10.1590/S1516-14392002000100005.

We evaluated the "residual" thermal conductivity of Portland cement concretes (with characteristic compressive strength at 28 days, fck, of 20 MPa and 50 MPa) at room temperature after heat-treating at 180 °C, 300 °C and 600 °C. The description of the geometry of the structure was carried out using mercury intrusion porosimetry and nitrogen sorption. The results showed a decreasing tendency of residual thermal conductivity, which we attributed to heat-induced concrete degradation. Furthermore, the results from mercury intrusion porosimetry and nitrogen sorption tests showed that a coarser pore structure is produced with the raise of heat-treatment temperatures.

Keywords : concrete; mercury intrusion porosimetry; nitrogen sorption; residual thermal conductivity.

        · text in English     · English ( pdf epdf )

 

Creative Commons License All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License