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Road Materials and Pavement Design Volume 15, 2014 - Issue 2
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Thematic issue scientific papers

Micromorphology and microrheology of modified bitumen by atomic force microscopy

L.M. RebeloPhysics Department, Universidade Federal do Ceará, Fortaleza, Brazil
,
P.N. CavalcantePhysics Department, Universidade Federal do Ceará, Fortaleza, Brazil
,
J.S. de SousaPhysics Department, Universidade Federal do Ceará, Fortaleza, BrazilCorrespondence[email protected]
,
J. Mendes FilhoPhysics Department, Universidade Federal do Ceará, Fortaleza, Brazil
,
S.A. SoaresChemistry Department, Universidade Federal do Ceará, Fortaleza, Brazil
&
J.B. SoaresTransportation Engineering Department, Universidade Federal do Ceará, Fortaleza, Brazil
Pages 300-311 | Received 13 Feb 2013, Accepted 15 Nov 2013, Published online: 03 Jan 2014
 
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Abstract

The rheological study of bitumen is essential to improve the performance of pavements. Bitumen properties are traditionally determined by means of dynamic shear rheometer measurements. In this work, we aim to demonstrate that atomic force microscopy (AFM) can be a powerful complementary tool to the characterisation of bitumen. In particular, we compare the mechanical properties of pure and modified bitumen. Two different anti-oxidant additives were used: PPA (poly-phosphoric acid) and LCC (cashew nut oil) at concentrations of 1% and 2%, respectively. We will show that the AFM technique is able to distinguish the effects of both additives in the morphological and micromechanical properties of bitumen films.

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