IN-PLACE EVALUATION OF CONCRETE

The two new methods for estimating the strength of concrete in structures are: (1) The Windsor probe test; and (2) the pull-out test. The Windsor probe measures the penetration resistance of concrete. The Windsor probe consistes of a power-actuated gun or driver, hardened alloy probes, loaded cartridges, a depth gage for measurement penetration, and related equipment. The probe is 0.25 in. (6.3 mm) in diameter, 3,125 in. (79.4 mm) long, and has a frusto-conical point. A pull-out test measures, with a dynamometer, the force required to pull out from concrete a specially shaped steel rod with an enlarged end that has been cast into that concrete. The pull-out force is related to compressive strength, the ratio of the pullout-compression strength being between 0.1 and 0.2. The two new pieces of equipment which are either simplified versions of equipment already available or are based upon well-established theoretical concepts are: (1) The PUNDIT; and (2) the Concrete Maturity Meter. The PUNDIT is a light-weight portable ultrasonic concrete-tester, whereas the Concrete Maturity Meter measures maturity of concrete by use of a probe.

• Corporate Authors:

  American Society of Civil Engineers

  345 East 47th Street
  New York, NY  United States  10017-2398
• Authors:
  • Malhotra, V M
• Publication Date: 1975-6

Media Info

• Features: Figures; References;
• Pagination: p. 345-357
• Serial:
  • Journal of the Construction Division
  • Volume: 101
  • Issue Number: C02

Subject/Index Terms

• TRT Terms: Compressive strength; Concrete tests; Dynamometers; Field tests; Measuring probes; Penetration resistance; Pull out test; Test procedures; Testing equipment
• Uncontrolled Terms: Windsor probe test
• Old TRIS Terms: Insitu methods; Maturity meter; Probes
• Subject Areas: Highways; Materials;

Filing Info

• Accession Number: 00096996
• Record Type: Publication
• Report/Paper Numbers: ASCE 11354 Proc Paper
• Files: TRIS
• Created Date: Jul 15 1975 12:00AM