Properties and Early-Age Cracking Potential of Blended Cement Concrete

Stress due to the temperature and moisture gradients in concrete slab often causes pavement curling and warping that may further cause concrete crack if the slab is under restraint conditions. The adding of supplementary cementitious materials (SCMs) can reduce the risk of cracking by reducing the temperature stress. However, under cold weather condition, the slower strength development due to SCMs could increase the risk. This paper reported a study result of using blended cement to reduce such a risk. In this study, the properties of ternary cement concrete, such as setting time, heat of hydration, and datum temperature, were investigated. The risk of early-age cracking for different concrete mixes under different weather conditions was evaluated by the HIPERPAV. The test results indicated that fly ash replacement generally increases the setting time; while the slag replacement reduced the setting time. Both fly ash and slag replacement reduced the generated heat. When the amount of slag increased, the datum temperature and activation energy increased. HIPERPAV analysis indicated that there was little risk of early-age cracking for binary or ternary cement concrete under average summer weather conditions due to proper strength development of the concrete. However, the risk of early-age cracking for the concrete pavement increased under spring or fall weather conditions.

Language

  • English

Media Info

  • Media Type: Print
  • Features: Figures; References; Tables;
  • Pagination: pp 163-170
  • Monograph Title: Material, Design, Construction, Maintenance, and Testing of Pavement: Selected Papers From the 2009 GeoHunan International Conference

Subject/Index Terms

Filing Info

  • Accession Number: 01142797
  • Record Type: Publication
  • ISBN: 9780784410455
  • Files: TRIS
  • Created Date: Oct 5 2009 12:28PM