Influence of aggregate mineralogical composition on water resistance of aggregate–bitumen adhesion

The effects of aggregate mineralogical composition on moistures sensitivity of aggregate–bitumen bonds were investigated using four aggregate types (two limestone and two granite)and two bitumen grades (40/60 penand70/100pen). Moisture sensitivity (or water resistance) of the aggregate–bitumen bonds were characterized using retained strength obtained from three different tensile tests (peel, PATTI and pull-off). The results showed significant differences in the amount of moisture absorbed by a given aggregate which suggested strong correlations between aggregate mineral composition and moisture absorption. For most of the aggregate–bitumen bonds, failure surfaces transformed from cohesive to adhesive with conditioning time there by confirming the strong influence of moisture on aggregate bonds. The three tensile tests used in this study showed similar rankings in terms of moisture sensitivity but the pull-off test was found to be the most sensitive. The effect of bitumen on moisture sensitivity was found to be lower than the effect of aggregates, with the moisture absorption properties of the aggregates depending strongly on certain key minerals including clay, anorthite and calcite. Strong correlations ere also found between mineral compositions and moisture sensitivity with clay and anorthite having strong negative influence while calcite showed positive effect on moisture sensitivity. Previous studies have identified various mineral phases like albite, quartz, and k-feldspar, as detrimental in terms of moisture sensitivity.The results appear to support the extension of the existing list of detrimental aggregate minerals to include anorthite and clay while supporting the case of calcite as a moisture resistant mineral.

[1]  D. R. Moore,et al.  Analysis of peel arm curvature for the determination of fracture toughness in metal-polymer laminates , 2005 .

[2]  Anthony J. Kinloch,et al.  The development of a novel test method to assess the durability of asphalt road–pavement materials , 2013 .

[3]  N. Ahmad.  Asphalt mixture moisture sensitivity evaluation using surface energy parameters , 2011 .

[4]  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 .

[5]  R L Terrel,et al.  WATER SENSITIVITY OF ASPHALT-AGGREGATE MIXES: TEST SELECTION , 1994 .

[6]  E. Felder,et al.  Influence of the interfacial composition on the adhesion between aggregates and bitumen: Investigations by EDX, XPS and peel tests , 2011 .

[7]  David R. Large,et al.  Assessing asphalt mixture moisture susceptibility through intrinsic adhesion, bitumen stripping and mechanical damage , 2014 .

[8]  A. R. Pasandín,et al.  The influence of the mineral filler on the adhesion between aggregates and bitumen , 2015 .

[9]  Young-Kyu Choi,et al.  State of the Art Report on Moisture Sensitivity Test Methods for Bituminous Pavement Materials , 2002 .

[10]  S. E. Zoorob,et al.  The influence of aggregate, filler and bitumen on asphalt mixture moisture damage , 2008 .

[11]  Matthieu Horgnies,et al.  Influence of the surface properties of concrete on the adhesion of coating: Characterization of the interface by peel test and FT-IR spectroscopy , 2011 .

[12]  V Nicholson.  ADHESION TENSION IN ASPHALT PAVEMENTS, ITS SIGNIFICANCE AND METHODS APPLICABLE IN ITS DETERMINATION , 1932 .

[13]  S. Abo-Qudais,et al.  Effect of aggregate properties on asphalt mixtures stripping and creep behavior , 2007 .

[14]  F. Canestrari,et al.  Modified PATTI Test for the Characterization of Adhesion and Cohesion Properties of Asphalt Binders , 2009 .

[15]  Andy Collop,et al.  Optimising the moisture durability SATS conditioning parameters for universal asphalt mixture application , 2012 .

[16]  A. Kinloch,et al.  Durability of asphalt mixtures: Effect of aggregate type and adhesion promoters , 2014 .

[17]  Alex K. Apeagyei,et al.  Moisture-induced strength degradation of aggregate–asphalt mastic bonds , 2014 .