EXAMINATION OF MORTAR BARS CONTAINING VARYING PERCENTAGES OF COARSELY CRYSTALLINE GYPSUM AS AGGREGATE

Contamination of aggregate sources by coarsely crystalline gypsum occurs frequently in the Middle East. Mortar bars were made which contained up to 5 per cent gypsum (by weight of aggregate) in the form of aggregate pieces. The bars were made using three different cements of varying C3A content and were stored at 20 degrees C and 38 degrees C. The results show that significant expansions do not occur within mortar bars if their total sulphate content lies below the present British standard limit of 4 per cent of SO3 weight of cement. Sulphate resisting portland cement (SRPC) can tolerate a higher level of contaminant gypsum than ordinary portland cement (opc). Temperature also affects the degree of expansion, especially in the case of high C3A cement. (Author/TRRL)

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

  Pergamon Press, Incorporated

  Maxwell House, Fairview Park
  Elmsford, NY  United States  10523
• Authors:
  • Crammond, N J
• Publication Date: 1984-3

Media Info

• Features: Figures; References; Tables;
• Pagination: p. 225-230
• Serial:
  • Cement and Concrete Research
  • Volume: 14
  • Issue Number: 2
  • Publisher: Elsevier
  • ISSN: 0008-8846
  • Serial URL: http://www.sciencedirect.com/science/journal/00088846

Subject/Index Terms

• TRT Terms: Aggregates; Cement; Concrete; Expansion; Gypsum; Gypsum cement; Impurities; Metal bars; Mortar; Portland cement; Sulfate resisting cement; Sulfates; Test procedures
• Old TRIS Terms: Impurity
• ITRD Terms: 4758: Cement; 4755: Concrete; 6720: Expansion; 4175: Gypsum; 4769: Mortar; 2453: Pollution; 7310: Sulphate; 4747: Sulphate resistant cement; 6288: Test method
• Subject Areas: Geotechnology; Highways; Materials; Planning and Forecasting; I32: Concrete; I72: Traffic and Transport Planning;

Filing Info

• Accession Number: 00392436
• Record Type: Publication
• Source Agency: Transport Research Laboratory
• Files: ITRD, TRIS
• Created Date: Mar 29 1985 12:00AM