VARIATION IN TEST RESULTS FOR CEMENT CONTENT, WATER CONTENT AND WATER/CEMENT RATIO OF CONCRETE UNITS

The work described in this paper formed part of a programme of experimental work undertaken during 1989 to evaluate whether precast concrete units (some of which had deteriorated) had been manufactured out of specification in 1977 and 1980. The work was in two parts: (i) analysis of cores taken from the units, and (ii) experimental work with mixes and techniques designed to replicate the original manufacture and subsequent weathering of the units. It is the first part that is described here. Earlier work on cores from the units is outlined, then the analysis carried out by the authors described. Cores were taken from the same randomly selected location in 20 units and water and cement contents estimated for the central third. For three further cores the top, middle and bottom sections were analysed. The results are tabulated and discussed. An attempt is made to explain the randomness of the results. The authors conclude that whilst the average of a number may give a good indication of typical batch contents, individual results are of little significance due to random variation arising from sampling and testing.

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/00105317
• Corporate Authors:

  THE CONCRETE SOCIETY

  FRAMEWOOD ROAD
  WEXHAM,   United Kingdom  SL3 6PJ
• Authors:
  • GILBERTSON, A
  • LEES, T
• Publication Date: 1991-5-6

Language

• English

Media Info

• Features: References;
• Pagination: p. 46-9
• Serial:
  • CONCRETE
  • Volume: 25
  • Issue Number: 4
  • Publisher: THE CONCRETE SOCIETY
  • ISSN: 0010-5317

Subject/Index Terms

• TRT Terms: Deterioration; Mix design; Moisture content; Precast concrete; Sampling; Variables; Weathering
• Subject Areas: Design; Materials;

Filing Info

• Accession Number: 00630708
• Record Type: Publication
• Source Agency: Transport Research Laboratory
• Created Date: Jul 1 1996 12:00AM