Modeling of combined physical-mechanical moisture induced damage in asphaltic mixes : Part 1: governing processes and formulations

• Moisturehas for a long time been recognised as a serious contributor to premature degradation ofasphalticpavements. Many studies have been performed to collect, describe and measure themoisturesusceptibility ofasphalticmixes. Most of these are aimed at a comparative measure ofmoisturedamage, either via visual observations from field data or laboratory tests or viamechanicaltests, which give a so calledmoisturedamageindex parameter. The research presented in this paper ispartof an ongoing effort at Delft University of Technology, to move away from such comparative or empirical measures ofmoisture-induceddamageand start treatingmoisture-induceddamagein a comprehensive energy based framework. Such a framework would enable realistic predictions and time-assessment of the failure pattern occurring in anasphalticpavement under the given environmental and traffic loading which could be rutting, cracking, ravelling or any combination or manifestation thereof. Themodellingofmoisture-induceddamageis a complex problem, which involves a coupling betweenphysicalandmechanicaldamageprocesses. This paper discusses several modes ofmoistureinfiltration intoasphalticmixesand derives thegoverningequations for their simulations.Moisturediffusion into the mastic film, towards the aggregate-mastic interface and mastic erosion, due to high water pressures caused by the pumping action of traffic loading, are identified as the mainmoisture-induceddamageprocessesand are implemented in a new finite element program, named RoAM. The paper discusses the necessary model parameters and gives detailed verification of themoisturediffusion and advective transport simulations. In the accompanying paper the developed finite element model is demonstrated via an elaborate parametric study and the fundamentalmoisture-induceddamageparameters are discussed.

Ämnesord

TEKNIK OCH TEKNOLOGIER  -- Samhällsbyggnadsteknik -- Infrastrukturteknik (hsv//swe)

ENGINEERING AND TECHNOLOGY  -- Civil Engineering -- Infrastructure Engineering (hsv//eng)

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