Evaluation of Bond Strength between Overlay and Substrate in Concrete Repairs

Good bond strength between overlay and substrate is a key factor in performance of concrete repairs. This thesis was aimed at studying the evaluation of bond strength between repair material and substrate at the interface. Many factors such as surface roughness, existence of micro cracks, compaction, curing etc influence the bond strength. The quality assurance of the bond strength requires test methods that can quantify the bond strength as well as identify the failure mode. There have been numerous investigations led to development of different test methods. The forces which are applied in each test and the failure mode are important in order to choose the proper test. An interpretive study on test methods is presented. While this study can provide individually useful information on bond strength and bond characterization, it also contains discussions about each test and comparison of test methods.

[1]  D.D.L. Chung,et al.  Improving the bonding between old and new concrete by adding carbon fibers to the new concrete , 1995 .

[2]  M. R. Ehsani,et al.  Comparison of Methods for Evaluating Bond Strength Between Concrete Substrate and Repair Materials , 2005 .

[3]  Frederick M. Chester,et al.  Hybrid fracture and the transition from extension fracture to shear fracture , 2004, Nature.

[4]  Michel Pigeon,et al.  Influence of Surface Preparation on Long-Term Bonding of Shotcrete , 1995 .

[5]  Simon A. Austin,et al.  Tensile bond testing of concrete repairs , 1995 .

[6]  Gregory C. Frantz,et al.  FREEZE-THAW BOND DURABILITY OF RAPID-SETTING CONCRETE REPAIR MATERIALS , 1999 .

[7]  N. G. Shrive,et al.  Factors Affecting Bond Between New and Old Concrete , 1988 .

[8]  Fernando A. Branco,et al.  CONCRETE-TO-CONCRETE BOND STRENGTH. INFLUENCE OF THE ROUGHNESS OF THE SUBSTRATE SURFACE , 2004 .

[9]  Paulo B. Lourenço,et al.  Bond characterization between concrete substrate and repairing SFRC using pull-off testing , 2005 .

[10]  J. Silfwerbrand.  Shear bond strength in repaired concrete structures , 2003 .

[11]  Jb Rowntree,et al.  The curing of concrete , 1947 .

[12]  C. Atzeni,et al.  DIMENSIONAL VARIATIONS, CAPILLARY ABSORPTION AND FREEZE-THAW RESISTANCE OF REPAIR MORTARS ADMIXED WITH POLYMERS , 1993 .

[13]  W. G. Proud,et al.  High-strain rate Brazilian testing of an explosive simulant using speckle metrology , 2004 .

[14]  A. Vaysburd.  Durability of repaired concrete structures - The bottle for survival , 2006 .

[15]  Simon A. Austin,et al.  Shear bond testing of concrete repairs , 1999 .

[16]  Norbert J. Delatte,et al.  BOND STRENGTH DEVELOPMENT WITH MATURITY OF HIGH-EARLY-STRENGTH BONDED CONCRETE OVERLAYS , 2000 .

[17]  Johan Silfwerbrand,et al.  IMPROVING CONCRETE BOND IN REPAIRED BRIDGE DECKS , 1990 .

[18]  Kwesi Sagoe-Crentsil,et al.  Guide to concrete repair and protection: HB84–1996 , 2006 .

[19]  Norbert J. Delatte,et al.  Laboratory and Field Testing of Concrete Bond Development for Expedited Bonded Concrete Overlays , 2000 .

[20]  A. McC. Murray,et al.  The "Pul l-Off" Partially Destructive Test for Concrete , 1984 .

[21]  Xxyyzz.  Standard Practice for Shotcrete , 1995 .

[22]  S. Kosmatka,et al.  Design and Control of Concrete Mixtures , 2002 .

[23]  James E McDonald,et al.  An Evaluation of Equipment and Procedures for Tensile Bond Testing of Concrete Repairs , 1999 .

[24]  Gongkang Fu,et al.  Inspection and monitoring techniques for bridges and civil structures , 2005 .

[25]  P. Perkins.  Repair, Protection and Waterproofing of Concrete Structures , 1997 .

[26]  J. Silfwerbrand,et al.  THE SWEDISH EXPERIENCE : BETTER BONDING OF BRIDGE DECK OVERLAYS , 1998 .

[27]  Bond Strength of Shotcrete Repair , 2004 .