Assessment of Effectiveness of Rejuvenators on Artificially Aged Mortar

Journal article (2016)

Authors

Y. Zhang Pavement Engineering - CEG
Martin van de Ven Pavement Engineering - CEG
A.A.A. Molenaar Pavement Engineering - CEG
Shaopeng Wu Wuhan University of Technology
Research Group
Pavement Engineering (CEG) (TU Delft)
Rejuvenator Rheological properties Finite-element modeling Artificially aged mortar Dynamic shear test Shear fatigue properties
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Published Date

01-09-2016

Language

English

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Faculty

Civil Engineering & Geosciences

Department

Engineering Structures

Research Group

Pavement Engineering

Abstract

A preventive maintenance strategy of spraying rejuvenators on asphalt pavement surfaces is being considered as a cost-effective and environmentally sustainable option to extend the service life of existing asphalt concrete pavements. Rejuvenators might penetrate into the asphalt concrete and soften (rejuvenate) the bituminous binder. In this paper, the rejuvenation effectiveness of two rejuvenators on an artificially aged mortar is assessed. Cylindrical mortar specimens were prepared from the artificially aged mortar and then treated by the rejuvenators. The rheological and shear fatigue properties of the reference and treated mortar specimens were measured using dynamic shear tests. Meantime, a three-dimensional column model was created to investigate the dynamic shear test's capability of detecting the rheological properties of a composite column with a soft material in its outer part and a stiff material in its inner part. From finite-element modeling, it is found that the shear modulus of the composite column is higher than that of the soft material and lower than that of the stiff material. However, the results of the dynamic shear tests show that the two rejuvenators did not decrease the complex shear modulus of the artificially aged mortar. In addition, the two rejuvenators did not change the shear fatigue life of the artificially aged mortar.