PRODUCTION AND USE OF CALCINED NATURAL POZZOLANS IN CONCRETE

The aim of producing concrete providing long-term durability with regard to properties such as improved sulfate resistance and reduced susceptibility to alkali-silica reactions (ASR) has led to development of several high-performance materials. While use of fly ash and ground granulated blast-furnace slags in concrete has gained acceptance in some applications, the mineralogical composition of such byproduct materals cannot be controlled as easily as a manufactured pozzolan. Processing of performance enhancing pozzolans is accomplished by thermally treating and converting crystalline clay materials to amorphous alumino silicates. These pozzolans can be interground with portland cement clinker and gypsum to produce a Type-IP blended cement, or ground separately as mineral admixtures for concrete. This paper describes some of the choices available to manufacturers of blended cement to engineer into the cementitious system desired properties for concrete such as improved sulfate resistance, reduced permeability, and the ability to strongly mitigate ASR.

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/oclc/3528769
• Corporate Authors:

  American Society for Testing and Materials (ASTM)

  100 Barr Harbor Drive, P.O. Box C700
  West Conshohocken, PA  United States  19428-2957
• Authors:
  • Barger, G S
  • Hansen, E R
  • Wood, M R
  • Neary, T
  • Beech, D J
  • Jaquier, D
• Publication Date: 2001-12

Language

• English

Media Info

• Features: Figures; References; Tables;
• Pagination: p. 73-80
• Serial:
  • Cement, Concrete and Aggregates
  • Volume: 23
  • Issue Number: 2
  • Publisher: American Society for Testing and Materials (ASTM)
  • ISSN: 0149-6123
  • Serial URL: http://journalsip.astm.org/JOURNALS/CEMENT/cca_home.html

Subject/Index Terms

• TRT Terms: Admixtures; Alkali silica reactions; Calcines; Concrete industry; Concrete pavements; Durability; Highway engineering; Highway transportation; Pavement components; Pavement design; Permeability; Pozzolan; Sulfate resisting cement
• Candidate Terms: Blended cement
• Subject Areas: Construction; Design; Highways; Materials; Pavements; I22: Design of Pavements, Railways and Guideways; I32: Concrete;

Filing Info

• Accession Number: 00823045
• Record Type: Publication
• Files: TRIS
• Created Date: Jan 16 2002 12:00AM