Fast-Track Construction with High-Strength Concrete Mixes Containing Ground Granulated Blast Furnance Slag

The early age strength development of concretes containing ground granulated blast furnance slag (GGBS) at cement replacement levels of 20, 35, 50 and 70% have been investigated to give guidance for their use in fast track construction. 28-day target mean strengths for all concretes was 100 MPa. Although supplementary cementitious materials like ggbs are economical, their use has not gained popularity in fast track construction because of their slower strength development at early ages and at standard cube curing temperatures. There are however indications that supplementary cementitious materials are heavily penalized by the standard cube curing regimes. Measurements of temperature rise under adiabatic conditions have shown that high levels of cement replacement by ggbs, e.g. 70% are required to obtain a significant reduction in the peak temperature rise. However, despite that these temperature rises are lower than those of portland cement mixtures they are still sufficient to provide the activation energy needed for the reaction of ggbs to “kick-in” earlier. The early-age strength of companion cubes cured at 20 degrees. The high early age temperatures are shown to be especially beneficial to ggbs concretes. Maturity measurements will be needed in order to take advantage of the enhanced in-situ early age strength development of ggbs concretes. The contractor needs to be able to confirm that the actual strength of the concrete in the structure at the rime of formwork removal exceeds a certain compressive strength. Maturity functions like the Nurse-Saul and the Arrhenius equation have been examined for their applicability to ggbs concretes. Activation energies, required as input for the Arrhenius equation, have been determined according to ASTM C1074-98.

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/isbn/0870311808
• Corporate Authors:

  American Concrete Institute (ACI)

  38800 Country Club Drive
  Farmington Hills, MI  United States  48331
• Authors:
  • Soutsos, M N
  • Barnett, S J
  • Bungey, J H
  • Millard, S G
• Conference:
  • Seventh International Symposium on the Utilization of High Strength/High-Performance Concrete
  • Location: Washington DC, United States
  • Date: 2005-6-20 to 2005-6-24
• Publication Date: 2005

Language

• English

Media Info

• Media Type: Print
• Features: Figures; References; Tables;
• Pagination: pp 255-270
• Monograph Title: Seventh International Symposium on the Utilization of High Strength/High-Performance Concrete
• Serial:
  • Volume: 1 & 2

Subject/Index Terms

• TRT Terms: Activation analysis; Adiabatic conditions; Blast furnaces; Compressive strength; Durability; Energy absorption; High strength concrete; Slag; Strength of materials; Temperature measurement
• Subject Areas: Highways; Materials; I32: Concrete;

Filing Info

• Accession Number: 01004575
• Record Type: Publication
• ISBN: 0870311808
• Files: TRIS
• Created Date: Sep 30 2005 11:15AM