LOK/CAPO Test Publications

LOK-Test and CAPO-Test Literature

  1. Kiekegaard-Hansen, P..: “Lok-Strength”, Nordisk Betong 3-1975
  2. Jensen, B.C. & Bræstrup, M.W.: ”Lok-Test determine the compressive strength of concrete”, Nordisk Betong 2-1976
  3. Kierkegaard-Hansen, P.: “LOK-TEST until today Oct. 1978, Historical background”, Danish Engineering Academy, 1978
  4. Ottosen, N.S.: “Influence on pullout strength in relation to change in depth for the LOK-TEST and the CAPO TEST”, Copenhagen, Denmark, 1978
  5. Kierkegaard-Hansen, P. & Bickley, J.A.: “In-situ strength evaluation of concrete by the LOK-TEST system”, ACI Fall Convention, Nov. 3rd, 1978
  6. Trow Group: “Special Mix, Fast Test Speed Building Job”, Heavy Construction News, Oct 1978
  7. Drinkgern, G.: “Neuartige Erhärtungsprüfung an Bauteilen aus Beton”, Fertigteile Beton Werkstein, Sonderdruck Heft 2/78 (in German)
  8. Bickley, J.A.: “Sample proposal for the use of Lok-Test on a project”, University of Liverpool, Dec., 2000
  9. Petersen, C.G.: “CAPO-TEST”, Nordisk Betong, 5-6, 1980
  10. Ottosen, N.S.: “Nonlinear Finite Element Analysis of Pull-Out Test”, Journal of the Structural Division, ASCE, Vol. 107, No. ST4, April 1981
  11. Bickley, J.A. & Fasullo, S.: “Analysis of pull-out test data from Construction sites”, Transportation Research Board, Washington, USA, Jan 1981
  12. Krenchel, H.: “LOK-Styrkeprøvning og CAPO-Styrkeprøvning af Betons Trykstyrke”, Department of Structural Engineering, Technical University of Denmark, Serie I, No 71, 1982 (in Danish) 
  13. Bickley, J.A.: “The Variability of Pullout Tests and In-Place Concrete Strength”, Concrete International, April 1982
  14. Hubler, R.L.: “Developer Saves Time, Reduce Interest Costs with New Concrete Testing System”, Canadian Building Magazine, Jan. 1982
  15. Bickley, J.A.: “The Evaluation and Acceptance of Concrete Quality by In-Place Testing”, SP 82-6, ACI
  16. Bellander, U.: “Kvalitetskontroll av Betonkonstruktioner”, Nordisk Betong 3-4 1983 (in Swedish)
  17. Petersen, C.G.: ”LOK-test and CAPO-Test development and their applications”, Proc. Inst´n Civ. Engrs, Part 1, Vol 76, May 1984
  18. Krenchel, H. & Petersen, C.G.: In-Situ Pullout Testing with LOK-TEST, Ten Years Experience”, Int. Conf. on In-Situ / Non-Destructive Testing of Concrete, Canmet, ACI, Canadian Society for Civil Engineers and National Bureau of Standards, Ottawa, Canada, Oct 2-5, 1984
  19. Bickley, J.A.: “Trinity Square: Commentary on Concrete”, Cement and Concrete Aggregates, ASTM, 1984
  20. Bickley, J.A.: “Cost Effectiveness of In-Situ Testing”, CANMET/ACI Intnl. Conference on In-Situ/NonDestructive Testing of Concrete, Ottawa, Oct 2, 1984
  21. Krenchel, H. & Mossing, P.: “LOK-Styrkeprøvning af Beton, Brudmekanisk Analyse”, Department of Structural Engineering, Technical University of Denmark, Serie R, No 198, 1985 (in Danish)
  22. Krenchel, H. & Shah, S.P.: “Fracture Analysis of the Pull-Out Test”, RILEM, Materials and Structures, November-December 1985, No 108
  23. Krenchel, H. & Bickley, J.A.: “Pullout Testing of Concrete, Historical Background and Scientific Level Today”, Nordic Concrete Research, The Nordic Concrete Federation, Publication No. 6, 1987
  24. Bickley, J.A.: “Achieving Safety and Economy in High Rise Concrete Structures through the use of InPlace Testing”, Third International Conference on Tall Buildings, Chicago, USA, Jan. 1986
  25. Jensen, J.Kr.J., “Influence of Stresses in a Structure on the LOK-TEST Pullout Force”, Department of Building Technology and Structural Engineering, AUC, Denmark, 1987
  26. Stone, W.C., Carino, N.J. & Reeve, C.P.: “Statistical Methods for In-Place Strength Predictions by the Pullout Test”, ACI Journal, Technical Paper, Sept – Oct 1986
  27. Carino, N.J.: “Statistical Methods to Evaluate In-Place Test Results”, RILEM, Testing during concrete construction, Proceedings, Chapman and Hall, 1990
  28. Yun, C.H., Choi, K.R., Kim, S.Y. and Song, Y.C.: “Comparative Evaluation of Nondestructive Test Methods for In-Place Strength Determination”, Special Publication SP 112, American Concrete Institute, 1990
  29. Worthers, P.H.: “In-Situ Compressive Strength Testing of Precast Concrete Tunnel Lining Segments using CAPO-TEST”, Translink Joint Venture, Construction Materials Management, November 1990
  30. Petersen, C.G.: In-Place Testing for Quality Assurance and Early Loading Operations with Pullout Testing and Maturity Measurements”, in Testing during Concrete Construction, Chapman and Hall, RILEM Workshop, Mainz, March 1990.
  31. Petersen, C.G. & Poulsen, E.: ”Pull-Out Testing by LOK-TEST and CAPO-TEST with particular reference to the Great Belt Link, Danish Concrete Institute, 1993
  32. Great Belt Link: “LOK and CAPO Tests, The experience of pull-out testing during The Great Belt Link (Storebælt) project in Denmark, Storebæltsforbindelsen, Denmark, 1999
  33. Bickley, J.A. & Hindo, K.R.: “How to Build Faster for Less – The Role of In-Place Testing in Fast Track Construction”, ACI Spring Convention, March 20, 1994
  34. Bishr, A.M., Al-Armoudi, O.S.B, Basanbul, I. & Al-Sulalmani, G.: “Assessment of concrete compressive strength using the Lok-Test”, Construction and Building Materials 1995, Vol. 9, No 4.
  35. Petersen, C.G.: “LOK-TEST and CAPO-TEST pullout testing, Twenty Years Experience”, British Insitute of Non-Destructive Testing, Non-Destructive Testing in Civil Engineering Conference in Liverpool, April 8-11, 1997
  36. Soutsos, M.N., Bungey, J.H. & Long, A.E.: “In-Situ Strength Assessment of Concrete, The European Concrete Frame Building Project”, Department of Civil Engineering, University of Liverpool, UK, 1999 enclosed Strength Development Monitoring Case Studies
  37. BCA, BRE, Construct, Reinforced Concrete Counsil & DETR: “Early age strength assessment of concrete on site”, Best Practice Guides for In-Situ Concrete Frame Buildings, J.H. Bungey, A.E.Long, M.N. Soutsos & G.D. Henderson, BRE Report 387, CRC Ltd, UK, 2000
  38. Moczko, A.: “Comparison between compressive strength tests from cores, Capo-Test and Schmidt Hammer”, Department of Civil Engineering, Wroclaw University, Poland, 2008
  39. Bickley, J.A.: “A Brief History of Pullout Testing: With Particular Reference to Canada, A Personal Journey”, International Conference on Non-Destructive Testing, ACI, Seville, Spain, Oct 2009
  40. Thun, H., Ohlsson, U. & Elfgren, L.: “Determination of Concrete Compressive Strength with Pullout Tests”, Structural Concrete Journal of the fib, Thomas Telford 2009
  41. Moczko, A., Carino, N.J. & Petersen, C.G.: “CAPO-TEST to Estimate Concrete Strength in Bridges”, ACI Materials Journal, Technical Paper, No 113-M76, November – December 2016
  42. Zhengqi, Li, Desai, J. & Wesley B.: “In-Place Estimation of Concrete Compressive Strength Using Postinstalled Pullout Tets – A Case Study”, Journal of Testing and Evaluation, ASTM, August31, 2018
  43. Poulsen, E.: “Note on the determination of Characteristic Value of Observations”, Copenhagen, Denmark, 2001
  44. Correlation procedure for establishing the relation of pullout force versus cylinder compressive strength


CAPO-Test and LOK-Test for compressive strength near to surface:

Additional Articles: