CROSS-SECTIONAL STRENGTH GRADIENTS IN HIGH STRENGTH CONCRETE COLUMNS

Vertical variations of strength in a structural element is a well- established phenomenon. In large cross-sections, horizontal strength gradients can also occur because of local differences in humidity and temperature conditions. When the heat of hydration of concrete is free to dissipate from a cross-section, the temperature variations within a cross-section imply not only differing rates of strength development but also a risk of thermal cracking due to high temperature gradients. A series of columns of two cross-sectional dimensions were cast in the laboratory for concrete mixes with 28-day compressive strengths ranging from 40 to 115 MPa. Compressive strength results of vertically drilled cores showed the presence of significant cross- sectional strength gradients. Three-dimensional core strength distributions were constructed from which effective cross-sectional strengths of unreinforced in-situ concrete were calculated. (A)

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/00088846
• Corporate Authors:

  Pergamon Press, Incorporated

  Headington Hill Hall
  Oxford OX30BW,    
• Authors:
  • Mak, S L
  • Attard, M M
  • Ho, DWS
  • DARVALL, PLEP
• Publication Date: 1994

Language

• English

Media Info

• Features: References;
• Pagination: p. 139-49
• Serial:
  • Cement and Concrete Research
  • Volume: 24
  • Issue Number: 1
  • Publisher: Elsevier
  • ISSN: 0008-8846
  • Serial URL: http://www.sciencedirect.com/science/journal/00088846

Subject/Index Terms

• TRT Terms: Columns; Concrete; Cracking; Hydration; Strength of materials; Temperature
• ITRD Terms: 3434: Bridge pier; 4755: Concrete; 5211: Cracking; 7195: Hydration; 5544: Strength (mater); 6722: Temperature
• Subject Areas: Materials;

Filing Info

• Accession Number: 00662496
• Record Type: Publication
• Source Agency: Transport Research Laboratory
• Files: ITRD
• Created Date: Jul 28 1994 12:00AM