Evaluation of self healing properties of bituminous binders taking into account steric hardening effects

Santagata, Ezio; Baglieri, Orazio; Tsantilis, Lucia; Dalmazzo, Davide

doi:10.1016/j.conbuildmat.2012.11.118

Cited by 54 publications

(21 citation statements)

References 27 publications

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“…(2)). Results showed that none of the tested binders exhibited a full self-healing capability, in line with findings of previous studies performed on both neat and polymer-modified bitumens [9]. This conclusion is proven by the difference which in Fig.…”

Section: Healing Testssupporting

confidence: 93%

“…These were associated to reductions of the norm of the complex modulus (D|G ⁄ 0 |) equal to 5%, 10%, 30% and 50%. Moreover, as proposed by the authors in previous studies [9], a no-damage condition was also included in the investigation. In this specific case, the first rest period was imposed after few loading cycles, thus evaluating the effect of load interruption after the sample experienced negligible damage.…”

Section: Healing Testsmentioning

confidence: 99%

“…With the aim of assessing the true healing capability of nano-modified bituminous binders, stiffness recovery measured during rest periods was further analysed and modelled according to a procedure developed by the Authors in previous studies [9]. This approach requires the evaluation of the progression of mechanical properties during rest periods by referring to the difference (D|G ⁄ |) between the stiffness of the sample at the generic rest time t and that recorded at the start of the unloading phase.…”

Section: Healing Testsmentioning

confidence: 99%

“…However, bituminous binders are capable of recovering a significant portion of damage during rest periods or in certain environmental conditions [2]. This intrinsic capability, commonly known as self-healing, has been thoroughly investigated in the last decades with the aim of providing an explanation of experimental evidence and of fully exploiting the performance potential of bituminous products [3][4][5][6][7][8][9][10]. It has been postulated that the primary competing and inter-dependent healing mechanisms which take place in the fracture zone are flow and wetting of crack faces, diffusion of molecules from one face to the other, and randomisation of diffused molecules.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Fatigue and healing properties of nano-reinforced bituminous binders

Santagata

Baglieri

Tsantilis

et al. 2015

International Journal of Fatigue

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Section: Healing Testssupporting

confidence: 93%

Section: Healing Testsmentioning

confidence: 99%

Section: Healing Testsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Fatigue and healing properties of nano-reinforced bituminous binders

Santagata

Baglieri

Tsantilis

et al. 2015

International Journal of Fatigue

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“…Although arbitrary and controversial, this failure criterion has been widely used by many researchers (Soenen and Eckmann 2000;Lu et al 2003;Soenen et al 2004;Shen et al 2010;Santagata et al 2013). …”

Section: Estimation Of Fatigue Lifementioning

confidence: 97%

Evaluation of Different Methods for the Estimation of the Bitumen Fatigue Life with DSR Testing

et al. 2015

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Asphalt fatigue cracking is one of the phenomena that contribute most to degradation of road pavements and it may initiate within the bitumen or at the bitumen-aggregate interface. The cohesive cracking resistance can be evaluated with bitumen testing. Commonly, the Dynamic Shear Rheometer (DSR) is used for bitumen testing. This paper presents an evaluation of different methods proposed in literature for the estimation of the bitumen fatigue life. A neat and a polymer modified bitumen (PMB) were tested with time sweep tests (continuous and discontinuous loading) and with incremental load amplitude (linear amplitude sweep test). The results are analysed with the traditional approach (N f,50 corresponding to 50 % initial modulus reduction) and other methodologies, namely the Ratio of Dissipated Energy Change (RDEC) and the Viscoelastic Continuum Damage (VECD) approach. The results obtained showed, as expected, that the PMB has a higher resistance to fatigue than the neat bitumen. The test conditions and the method used to evaluate the fatigue resistance lead to significant differences in the estimated bitumen fatigue life. The plateau value (RDEC) shows very good correlation with N f,50 obtained from constant strain amplitude tests, regardless of the type of bitumen or test conditions. The fatigue life parameters obtained from the linear amplitude sweep test is very sensitive to the analysis method. Healing during non-loading periods has a large effect on the PMB fatigue life while no effect in the neat bitumen fatigue life for small to intermediate rest periods.

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