Failure mechanism analysis of asphalt–aggregate systems subjected to direct shear loading

In order to investigate the mechanical behavior of asphalt–aggregate systems subjected to direct shear loading and reveal the shear failure mechanism, four groups of direct shear tests were conducted on composite specimens under different experimental conditions with a self-manufactured direct shear test apparatus at 25 °C. Comparative studies were conducted to evaluate the effects of stone surface treatment, asphalt film thickness and loading rate on the shear mechanical behavior of asphalt–aggregate specimens. Results showed that two kinds of the complete stress–displacement curves, including the general single-peak curve and the first-known double-peak curve, were clearly observed for each condition. In addition, the internal failure mechanisms were analyzed based on qualitative and quantitative methods. It can be concluded that the potential failure modes of the direct shear test include adhesive failure at the asphalt–aggregate interface and cohesive failure within the asphalt film. The research results enhance understanding of the shear mechanical behavior and failure mechanism of asphalt mixture, and also provide a reference for the interfacial failure.

[1]  Burak Sengoz,et al.  Effect of asphalt film thickness on the moisture sensitivity characteristics of hot-mix asphalt , 2007 .

[2]  A. H. Al-Saidy,et al.  Structural behavior of corroded RC beams with/without stirrups repaired with CFRP sheets , 2015, Materials and Structures.

[3]  Antonio D’Andrea,et al.  Dynamic tests on bituminous layers interface , 2016 .

[5]  J. Grenfell,et al.  Experimental evaluation of cohesive and adhesive bond strength and fracture energy of bitumen-aggregate systems , 2016 .

[6]  Gilda Ferrotti,et al.  Shear and flexural characterization of grid-reinforced asphalt pavements and relation with field distress evolution , 2015 .

[7]  Wagh,et al.  THE EFFECT OF THE PHYSICAL AND CHEMICAL CHARACTERISTICS OF THE AGGREGATE ON BONDING , 1991 .

[8]  Xinhua Yang,et al.  Experimental and numerical investigation of fracture behavior of asphalt mixture under direct shear loading , 2015 .

[9]  Lu Sun,et al.  A viscoelastic–viscoplastic damage constitutive model for asphalt mixtures based on thermodynamics , 2013 .

[10]  Ali Topal,et al.  Determination of fine aggregate angularity in relation with the resistance to rutting of hot-mix asphalt , 2005 .

[11]  Hao Wang,et al.  Study of cohesion and adhesion properties of asphalt concrete with molecular dynamics simulation , 2016 .

[12]  Yan Xi.  Study of the shear adhesiveness between bitumen and rock , 2001 .

[13]  Hussain U Bahia,et al.  Adhesive and Cohesive Properties of Asphalt-Aggregate Systems Subjected to Moisture Damage , 2010 .

[14]  A. Calabi-Floody,et al.  Mechanical behavior of asphalt mixtures with different aggregate type , 2015 .

[16]  Yu Liu,et al.  Viscoelastic Model for Discrete Element Simulation of Asphalt Mixtures , 2009 .

[17]  Elisabete F. Freitas,et al.  Effect of Construction Quality, Temperature, and Rutting on Initiation of Top-Down Cracking , 2005 .

[18]  Christian Huet,et al.  Coupled size and boundary-condition effects in viscoelastic heterogeneous and composite bodies , 1999 .

[19]  S. Mitrovic,et al.  Evaluation of adhesion/cohesion bond strength of the thick plasma spray coatings by scratch testing on coatings cross-sections ☆ , 2011 .

[20]  Ali Khodaii,et al.  A review of state of the art on stripping phenomenon in asphalt concrete , 2013 .

[21]  Hussain U Bahia,et al.  Relating Adhesion and Cohesion of Asphalts to the Effect of Moisture on Laboratory Performance of Asphalt Mixtures , 2005 .

[22]  A. Apeagyei,et al.  Examination of moisture sensitivity of aggregate–bitumen bonding strength using loose asphalt mixture and physico-chemical surface energy property tests , 2014 .

[23]  Åsa Laurell Lyne,et al.  Adhesion between bitumen and aggregate: implementation of spectroscopic ellipsometry characterisation and estimation of Hamaker’s constant , 2013 .

[24]  Jianzhuang Xiao,et al.  Experimental study on the failure mechanism of recycled concrete , 2011 .

[25]  Linglin Li,et al.  Interface effects on the creep characteristics of asphalt concrete , 2015 .

[26]  Andy Collop,et al.  The effect of asphalt mixture gradation and compaction energy on aggregate degradation , 2008 .

[27]  André Molenaar,et al.  Bitumen–stone adhesive zone damage model for the meso-mechanical mixture design of ravelling resistant porous asphalt concrete , 2011 .

[28]  P. Kandhal,et al.  Effect of Asphalt Film Thickness on Short- and Long-Term Aging of Asphalt Paving Mixtures , 1996 .

[29]  Zhibin Sun,et al.  Viscoelastic micromechanical model for dynamic modulus prediction of asphalt concrete with interface effects , 2016 .

[30]  Xianglin Gu,et al.  Influence of aggregate surface roughness on mechanical properties of interface and concrete , 2014 .

[31]  Gang Cheng,et al.  Evaluation of the shear characteristics of steel–asphalt interface by a direct shear test method , 2016 .

[32]  Shaopeng Wu,et al.  Ravelling investigation of porous asphalt concrete based on fatigue characteristics of bitumen–stone adhesion and mortar , 2009 .

[33]  Hao Wang,et al.  Micromechanical analysis of asphalt mixture fracture with adhesive and cohesive failure , 2014 .