CONCRETE PROOF FOR BRITISH CEMENT

The article examines the strength development and durability of concrete using modern cements. Manufacturing techniques and the chemical composition of portland cements are very similar throughout Europe. It is difficult to compare "average" concrete strengths because of differences in concrete strength tests and there are variations due to differences in materials in different parts of the country. Data from manufacturers and the ready-mixed industry show that the 7 day to 28 day strength ratios of UK cements increased up to the year 1984 and have now stabilised. Evidence is given to show that concretes also gain in strength well beyond 28 days, but the rate of gain varies with the temperature of the curing water. It is suggested that, because the pore filling ability is related to strength, then permeability and durability and the protection of reinforcing steel should improve with increased strength. Adiabatic conditions prevail in large sections of concrete, and the rise in temperature is mainly dependent on the heat of hydration. Modern cements have higher heats of hydration. Prediction of thermal cracking also depends upon the coefficient of thermal expansion of the concrete, the restraint to thermal movement and tensile strain. In structures of small thickness, limited temperature rises are not harmful.

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/00105317
• Authors:
  • NIXON, P J
  • SPOONER, D C
• Publication Date: 1993-5

Language

• English

Media Info

• Features: References;
• Pagination: p. 41,43-4
• Serial:
  • CONCRETE
  • Volume: 27
  • Issue Number: 5
  • Publisher: THE CONCRETE SOCIETY
  • ISSN: 0010-5317

Subject/Index Terms

• TRT Terms: Concrete; Concrete curing; Durability; Manufactures; Mix design; Strength of materials; Temperature
• Geographic Terms: United Kingdom
• ITRD Terms: 4755: Concrete; 4702: Curing (concrete); 5910: Durability; 3647: Manufacture; 4714: Mix design; 5544: Strength (mater); 6722: Temperature; 8119: United Kingdom
• Subject Areas: Design; Materials;

Filing Info

• Accession Number: 00662367
• Record Type: Publication
• Source Agency: Transport Research Laboratory
• Files: ITRD
• Created Date: Jul 28 1994 12:00AM