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Page 1: On the combined effect of moisture diffusion &  cyclic pore pressure generation in AC

On the Combined Effect of Moisture Diffusion & Cyclic Pore Pressure Generation in AC

Aikaterini Varveri, Sandra Erkens & Tom Scarpas Pavement Engineering, Delft University of Technology

Stavros Avgerinopoulos Faculty of Engineering, De Montfort University

CROW Infradagen 2014, The Netherlands, June 18-19, 2014

Page 2: On the combined effect of moisture diffusion &  cyclic pore pressure generation in AC

Moisture damage in AC

Moisture diffusion

Advective transport

Wheel loading

Pumping action

CO

UP

LIN

G Degradation of the cohesive strength

of the asphalt binder

Loss of the adhesion bond between aggregate & asphalt binder

Page 3: On the combined effect of moisture diffusion &  cyclic pore pressure generation in AC

Long- and short- term processes

Moisture diffusion

Pumping action

Page 4: On the combined effect of moisture diffusion &  cyclic pore pressure generation in AC

Moisture Induced Sensitivity Tester (MIST)

Moisture conditioning protocol

Page 5: On the combined effect of moisture diffusion &  cyclic pore pressure generation in AC

Determination of bath conditioning time

Dt

Fick’s law

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Determination of MIST cycles

Page 7: On the combined effect of moisture diffusion &  cyclic pore pressure generation in AC

Samples preparation

Aggregate Type

Bitumen Type

Pen 70/100

Moderately Polymer Modified

(Pen 50/80)

Highly Polymer Modified

(Pen 65/105)

Sandstone SP SM SH

Granite GP GM GH

Page 8: On the combined effect of moisture diffusion &  cyclic pore pressure generation in AC

Tensile Strength Ratio (TSR)

Page 9: On the combined effect of moisture diffusion &  cyclic pore pressure generation in AC

Long- and short-term contribution

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Tensile strength degradation

SH

SP

SM

GH

GM

GP

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Long- and short-term contribution

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Conclusions

Specifically mixtures produced with: - Sandstone aggregates show better moisture damage performance compared to granite mixtures. - polymer modified binders show lower susceptibility to moisture damage compared to those using conventional binders. - Softer bitumen types demonstrate higher moisture damage sensitivity.

The protocol enables: - The evaluation of the moisture resistance of asphalt mixtures and distinguishing mixtures with different moisture damage susceptibility. - The quantification of the individual short- and long-term moisture damage contribution to the overall specimen damage.

Page 13: On the combined effect of moisture diffusion &  cyclic pore pressure generation in AC

Aikaterini Varveri, Sandra Erkens & Tom Scarpas Pavement Engineering, Delft University of Technology

Stavros Avgerinopoulos Faculty of Engineering, De Montfort University

CROW Infradagen 2014, The Netherlands, June 18-19, 2014

Thank you for your attention!