FLOWING CONCRETE WITH SILICA. CAPILLARY SUCTION AND FROST RESISTANCE

FLYTBETONG MED SILICA. KAPILLAERSUGNING OCH FROSTBESTAENDIGHET

Several investigations have reported that the frost resistance of flowing concrete is low. The improvements that can be achieved by air entraining admixtures and an elevated cement content (reduced water/cement ratio) are stated to be considerably lower than in the case of concrete of stiffer consistency. This investigation has studied the capillary suction and frost resistance of flowing concrete in which 10% by weight of the cement has been replaced by silica. Frost resistance was studied for two different degrees of water absorption and by two methods. The concrete was compared with silica concrete of stiff consistency and with concrete without silica. The investigation was carried out in the laboratory under controlled curing conditions. The results showed that admixture of silica refines the capillary structure and improves the frost resistance of both flowing concrete and concrete of stiffer consistency. The frost resistance is satisfactory even at low air contents and high degrees of pore saturation. Admixture of silica into flowing concrete may be an alternative to entrainment of air to provide protection against frost and de-icing salts. This method is less sensitive to segregation and degradation of the protective system in connection with mixing and handling. (Author/TRRL)

• Corporate Authors:

  Statens Raad Foer Byggnadsforskning

  St Goeransgatan 66
  Stockholm,   Sweden 
• Authors:
  • Aavik, J
  • Kutti, T
  • RODHE, M
• Publication Date: 1985

Language

• Swedish

Media Info

• Features: Appendices; Figures; Photos; References; Tables;
• Pagination: 24 p.

Subject/Index Terms

• TRT Terms: Air entraining agents; Capillarity; Cement content; Concrete; Deicing chemicals; Freeze thaw durability; Frost susceptibility; Improvements; Silica; Water
• Old TRIS Terms: Capillary phenomena; Flowing concrete
• Subject Areas: Highways; Materials;

Filing Info

• Accession Number: 00462735
• Record Type: Publication
• Source Agency: Swedish National Road and Transport Research Institute (VTI)
• Report/Paper Numbers: NR66:1985
• Files: ITRD, TRIS
• Created Date: Mar 31 1987 12:00AM