Title:
CAPO-TEST to Estimate Concrete Strength in Bridges
Author(s):
Andrzej T. Moczko, Nicholas J. Carino, and Claus Germann Petersen
Publication:
Materials Journal
Volume:
113
Issue:
6
Appears on pages(s):
827-836
Keywords:
CAPO-TEST; carbonation; core strength; correlation; existing structures; in-place strength; pullout test
DOI:
10.14359/51689242
Date:
11/1/2016
Abstract:
This paper addresses whether carbonation in existing concrete structures affects the compressive strength estimated using the CAPO-TEST, a post-installed, pullout test conforming to ASTM C900 and EN 12504-3. Fifteen bridges, ranging from 25 to 52 years of age at the time of testing, were investigated. For each bridge, average values of core strengths and CAPO pullout strengths were obtained. Carbonation depth, which varied from 2 to 35 mm (0.08 to 1.4 in.), was measured using chemical staining methods. It was anticipated that, as the depth of carbonation increased, the pullout strength would increase for the same underlying concrete strength. Thus, the in-place compressive strength estimated on the basis of the manufacturer’s general correlation would be expected to systematically exceed the strength measured by the cores. It was found that, on average, the compressive strength estimated from the CAPO-TEST and the general correlation was only 2.8% greater than the measured core strength. More importantly, there was no correlation between depth of carbonation and the relative error of the estimated strength based on the CAPO-TEST.
Related References:
1. Petersen, C. G., “CAPO-TEST,” Nordisk Betong, No. 5-6, 1980, 3 pp.
2. Malhotra, V. M., and Carino, N. J., eds., Handbook on Nondestructive Testing of Concrete, second edition, CRC Press, Boca Raton, FL, 2004, 384 pp.
3. Bungey, J. H.; Millard, S. G.; and Grantham, M. G., Testing of Concrete in Structures, fourth edition, Taylor and Francis, UK, 2006, 353 pp.
4. Moczko, A., “Comparison between Compressive Strength Tests from Cores, CAPO-TEST and Schmidt Hammer,” Wrocław Technical University, Department of Civil Engineering, Wrocław, Poland, Aug. 2014, 10 pp.
5. ASTM C900-15, “Standard Test Method for Pullout Strength of Hardened Concrete,” ASTM International, West Conshohocken, PA, 2015, 10 pp.
6. European Standard EN-12504-3, “Testing Concrete in Structures – Part 3: Determination of Pullout Force,” European Committee for Standardization (CEN), Brussels, Belgium, 2005, 10 pp.
7. Petersen, C. G., and Poulsen, E., Pull-Out Testing by LOK-TEST and CAPO-TEST with Particular Reference to the In-place Concrete of the Great Belt Link, Dansk Betoninstitut A/S, Denmark, Nov. 1993, 140 pp.
8. British Cement Association, “Best Practice Guides for In-Situ Concrete Frame Building: Early Age Strength Assessment of Concrete On Site,” Crowthorne, Berkshire, UK, 2000, 4 pp.
9. CSA A23.1-14/A23.2-14, “Concrete Materials and Methods of Concrete Construction – Test Methods and Standard Practices for Concrete,” Canadian Standards Association, Mississauga, ON, Canada, Aug. 2014, 690 pp.
10. Germann Instruments A/S, “Procedure for CAPO-TEST (ASTM C900 and EN 12504-3),” Copenhagen, Denmark, Sept. 2015, www.germann.org.
11. Petersen, C. G., “LOK-TEST and CAPO-TEST Pullout Testing, Twenty Years Experience,” NDT in Civil Engineering Conference, Liverpool, UK, Apr. 1997, 19 pp.
12. Krenchel, H., and Petersen, C. G., “In-Situ Pullout Testing with LOK-TEST, Ten Years Experience,” Presentation at Research Session of the CANMET/ACI International Conference on In Situ/Nondestructive Testing of Concrete, Ottawa, ON, Canada, Oct. 1984, 24 pp.
13. ACI Committee 228, “In-Place Methods to Estimate Concrete Strength (ACI 228.1R-03),” American Concrete Institute, Farmington Hills, MI, 2003, 44 pp.
14. European Standard EN 13791, “Assessment of In-situ Compressive Strength in Structures and Precast Concrete Components,” European Committee for Standardization (CEN), 2005, 29 pp.
15. Soutsos, M. N.; Bungey, J. H.; and Long, A. E., “In-Situ Strength Assessment of Concrete, the European Concrete Frame Building Project,” Department of Civil Engineering, the University of Liverpool, Liverpool, UK, 1999, 10 pp.
16. Petersen, C. G., “In-Situ Strength by CAPO-TEST,” NATO Workshop on Load Carrying Capacity of Bridges, Høveltegård, Birkerød, Denmark, June 2015, 89 pp.
17. Carino, N. J., “Pullout Test,” Handbook on Nondestructive Testing of Concrete, second edition, V. M. Malhotra and N.J. Carino, eds., CRC Press, Chapter 3, 2004, 36 pp.
18. Krenchel, H., and Shah, S. P., “Fracture Analysis of the Pullout Test,” Materials and Structures, V. 18, No. 6, 1985, pp. 439-446. doi: 10.1007/BF02498746
19. Ottosen, N. S., “Nonlinear Finite Element Analysis of Pull-Out Test,” Journal of the Structural Division, ASCE, V. 107, Apr. 1981, pp. 591-603.
20. Krenchel, H., and Bickley, J. A., “Pullout Testing of Concrete,” Nordic Concrete Research, Publication No. 6, The Nordic Concrete Federation, 1987, pp. 155-168.
21. Neville, A. M., Properties of Concrete, fourth edition, John Wiley & Sons, Inc., New York, 1996, 844 pp.
22. Portland Cement Association (PCA), “Detecting Carbonation,” Concrete Technology Today, V. 12, No. 1, Mar. 1991, pp. 1-5.
23. European Standard EN 12390-3, “Testing Hardened Concrete – Part 3: Compressive Strength of Test Specimens,” European Committee for Standardization (CEN), 2009, 15 pp.
24. Bellander, U., “Quality Control of Concrete Structures,” Nordisk Betong, V. 3-4, 1983, 4 pp.
25. Worters, P. H., “In-Situ Compressive Strength of Precast Concrete Tunnel Lining Segments using CAPO-TEST,” Translink Joint Venture, Isle of Grain, UK, Nov. 1990, 28 pp.