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Damage and fracture characterization of asphalt concrete mixtures using the equivalent micro-crack stress approach
KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Byggvetenskap, Byggnadsmaterial.ORCID-id: 0000-0003-2849-5263
2017 (Engelska)Ingår i: Construction and Building Materials, ISSN 0950-0618, E-ISSN 1879-0526, Vol. 148, s. 521-530Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

In this paper, a new parameter termed “equivalent micro-crack stress” (σmc) is proposed for the evaluation of the cracking performance of asphalt mixtures with respect to their resistance to the initiation of micro-crack. The “equivalent micro-crack stress” (σmc) is a function of the material stiffness and the “micro-crack initiation threshold” (MCIT). The MCIT is a critical strain energy density at the instance of initiation of micro-crack. Experimental testing is carried out for the evaluation of the cracking performance of unmodified and wax modified asphalt mixtures using the Superpave IDT tests at −20 °C, −10 °C and 0 °C. The low temperature range is used in the study to minimize the effect of viscoplastic dissipation on the material cracking behaviour. The result shows that the “equivalent micro-crack stress” (σmc) gives a good indication of the material cracking performance of the unmodified and wax modified mixtures. A Finite Element Analysis is performed to assess the validity of the proposed approach under cyclic loading condition in the controlled-stress mode. The result shows that there is a good agreement between the material cracking performance in both monotonic and cyclic loading conditions using the proposed approach. The higher the “effective micro-crack stress” (σmc), the better the fracture performance of the mixture.

Ort, förlag, år, upplaga, sidor
Elsevier, 2017. Vol. 148, s. 521-530
Nyckelord [en]
Asphalt concrete, Damage and fracture characterization, Energy-based criterion, Equivalent micro-crack stress, Micro-crack initiation threshold MCIT
Nationell ämneskategori
Annan materialteknik
Identifikatorer
URN: urn:nbn:se:kth:diva-209499DOI: 10.1016/j.conbuildmat.2017.05.076ISI: 000404196700050Scopus ID: 2-s2.0-85019192742OAI: oai:DiVA.org:kth-209499DiVA, id: diva2:1112996
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QC 20170621

Tillgänglig från: 2017-06-21 Skapad: 2017-06-21 Senast uppdaterad: 2017-07-11Bibliografiskt granskad

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