The relationship between substrate roughness parameters and bond strength of ultra high-performance fiber concrete

The bonding that exists between the old concrete and the new concrete depends largely on the quality of substrate surface preparation. The accurate representation of substrate surface roughness can help determine very precisely the correct bonding behavior. In this work, an experimental investigation was carried out to quantify the normal concrete (NC) substrate roughness parameters and evaluate their relationship with the bonding performance of ultra high-performance fiber concrete (UHPFC), used as a repair material. The bond strength was quantified based on the results of the pull-off test, splitting cylinder tensile test, and the slant shear test. Three types of NC substrate surface preparation were used: as-cast (without surface preparation) as reference, wire-brushed, and sand-blasted (SB); the roughness of which was determined using an optical three-dimensional (3D) surface metrology device (Alicona Infinite Focus). It was observed from the result of the pull-off test that failure occurred in the substrate, even though adequate substrate surface roughness was provided. Moreover, analysis of the splitting cylinder tensile and slant shear test results showed that the substrate surface preparation method had a significant influence in bonding strength between UHPFC and the NC substrate. The composite UHPFC/NC substrate having a SB surface behaved closely as a monolithic structure under splitting and slant shear tests. An excellent correlation (R 2 > 85%) was obtained between the substrate roughness parameters and the results of the splitting cylinder tensile and slant shear tests.

[1]  H. Boumediène,et al.  Influence of the Roughness and Moisture of the Substrate Surface on the Bond between Old and New Concrete , 2010 .

[2]  Zhishen Wu,et al.  Nonlinear constitutive model for time-dependent behavior of FRP-concrete interface , 2007 .

[3]  Bassam A. Tayeh,et al.  Mechanical and permeability properties of the interface between normal concrete substrate and ultra high performance fiber concrete overlay , 2012 .

[4]  Eduardo Júlio,et al.  Correlation between concrete-to-concrete bond strength and the roughness of the substrate surface , 2007 .

[5]  B. Bissonnette,et al.  Parameters affecting the debonding risk of bonded overlays used on reinforced concrete slab subjected to flexural loading , 2009 .

[6]  Kal R. Hindo.  In-Place Bond Testing and Surface Preparation of Concrete , 1990 .

[7]  Bassam A. Tayeh,et al.  The Role of Silica Fume in the Adhesion of Concrete Restoration Systems , 2012 .

[8]  John J. Myers,et al.  Concrete Roughness Characterization Using Laser Profilometry for Fiber-Reinforced Polymer Sheet Application , 2001 .

[9]  Bassam A. Tayeh,et al.  Utilization of Ultra-High Performance Fibre Concrete (UHPFC) for Rehabilitation a Review , 2013 .

[10]  Javier León,et al.  Estimation of bond strength envelopes for old-to-new concrete interfaces based on a cylinder splitting test , 2011 .

[11]  P H Emmons,et al.  FACTORS AFFECTING THE DURABILITY OF CONCRETE REPAIR: THE CONTRACTOR'S VIEWPOINT , 1994 .

[12]  Benoît Bissonnette,et al.  Combination of mechanical and optical profilometry techniques for concrete surface roughness characterisation , 2009 .

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

[14]  M. Naderi.  Analysis of the Slant Shear Test , 2009 .

[15]  C. Chiu,et al.  A preliminary study of reactive powder concrete as a new repair material , 2007 .

[16]  Y. Mai,et al.  Substrate constraint and adhesive thickness effects on fracture toughness of adhesive joints , 2004 .

[17]  M. Grédiac,et al.  The transfer length in reinforced concrete structures strengthened with composite plates: Experimental study and modelling , 2007 .

[18]  L. Courard,et al.  Effect of concrete surface treatment on adhesion in repair systems , 2005 .

[19]  L. Turanli,et al.  Setting time: An important criterion to determine the length of the delay period before steam curing of concrete , 2003 .

[20]  Bassam A. Tayeh,et al.  Characterization of the interfacial bond between old concrete substrate and ultra high performance fiber concrete repair composite , 2013 .

[21]  L. Askar,et al.  Effect of Different Curing Conditions on the Mechanical Properties of UHPFC , 2013 .

[22]  Pal Mangat,et al.  A novel low voltage heating system for curing and protection of early age concrete , 2005 .

[23]  Luc Courard,et al.  Characterization of concrete surface roughness and its relation to adhesion in repair systems , 2006 .

[24]  C Ozyildirim,et al.  EVALUATION OF HIGH PERFORMANCE CONCRETE OVERLAYS PLACED ON ROUTE 60 OVER LYNNHAVEN INLET IN VIRGINIA , 2000 .

[25]  S. Esterby.  American Society for Testing and Materials , 2006 .

[26]  P H Emmons,et al.  How to make today’s repairs durable for tomorrow — corrosion protection in concrete repair , 2000 .

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

[28]  B. Tayeh,et al.  Mechanical properties of old concrete—UHPFC interface : Bassam A. Tayeh, B.H. Abu Bakar & M.A. Megat Johari , 2012 .