THE AUTOCLAM PERMEABILITY SYSTEM FOR MEASURING THE IN-SITU PERMEATION PROPERTIES OF CONCRETE

The Autoclam permeability system has been designed and developed to measure the air and water permeability and the sorptivity of concrete near the surface. Using this equipment, the rate of decay of air pressure is recorded for the air permeability test, whereas the volume of water penetrating into the concrete, at a constant pressure of 0.01 bar and 1.5 bar are recorded for the sorptivity and the water permeability tests respectively. These tests, which can be carried out quickly and effectively on site without prior planning, are essentially non-destructive in nature and a skilled operator is not needed. It has been found that statistically satisfactory results can be obtained from a mean of three tests and as the flow lines are largely concentrated within 40 mm from the surface, reliable data can be collected by drying the surface even if the surface under test is initially wet. This paper describes the features of this invention and presents results of a laboratory investigation with water-cement ratio, aggregate cement ratio and number of days of wet curing as the variables. A study of these data has indicated that the Autoclam can serve to bridge the gap between the specification of durability and compliance with it in practice. (A) For the covering abstract see IRRD 861706.

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/isbn/0903132206
• Corporate Authors:

  BRITISH INSTITUTE OF NON-DESTRUCTIVE TESTING

  1 SPENCER PARADE
  NORTHAMPTON,   United Kingdom  NN1 5AA
• Authors:
  • Basheer, PAM
  • MONTGOMERY, F R
  • LONG, A E
• Conference:
  • CONFERENCE PROCEEDINGS OF THE BRITISH INSTITUTE OF NON-DESTRUCTIVE TESTING INTERNATIONAL CONFERENCE, NDT IN CIVIL ENGINEERING 14-16 APRIL 1993, LIVERPOOL UNIVERSITY. VOLUME 1
• Publication Date: 1993

Language

• English

Media Info

• Features: References;
• Pagination: p. 235-59

Subject/Index Terms

• TRT Terms: Air; Conferences; Detection and identification; Detectors; Deterioration; Field tests; Loss and damage; Measuring instruments; Nondestructive tests; Permeability; Reinforced concrete; Structures; Test procedures; Water
• ITRD Terms: 6714: Air; 6155: Apparatus (measuring); 3352: Building (structure); 8525: Conference; 1614: Damage; 9115: Detection; 5255: Deterioration; 6226: In situ; 6216: Non destructive testing; 5921: Permeability; 4794: Reinforced concrete; 6288: Test method; 4355: Water
• Subject Areas: Bridges and other structures;

Filing Info

• Accession Number: 00644602
• Record Type: Publication
• Source Agency: Transport Research Laboratory
• ISBN: 0-903132-20-6
• Files: ITRD
• Created Date: Apr 18 1994 12:00AM