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Measurement of the viscoelastic properties of asphalt mortar and its components with indentation tests
KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Byggvetenskap, Byggnadsmaterial.
KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Byggvetenskap, Byggnadsmaterial.ORCID-id: 0000-0002-0596-228X
KTH, Skolan för teknikvetenskap (SCI), Hållfasthetslära (Inst.), Hållfasthetslära (Avd.).ORCID-id: 0000-0001-6232-8819
KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Byggvetenskap, Byggnadsmaterial.
2019 (engelsk)Inngår i: International Journal on Road Materials and Pavement Design, ISSN 1468-0629, E-ISSN 2164-7402Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Reliable determination of material properties is a key component for modelling and performance prediction of asphalt pavements. This paper deals with the potential use of instrumented indentation tests for viscoelastic characterisation of asphalt mortar as a new alternative to existing techniques. The main focus lies on the potential of indentation tests for multi-scale measurement of the shear relaxation modulus. A three-dimensional finite element model of a rigid spherical indenter penetrating an asphalt mortar sample is developed and used to model indentation tests performed at different material scales. The asphalt mortar is modelled as an idealised fine aggregate composite with elastic spheres, suspended within a viscoelastic bitumen mastic matrix. Based on the obtained numerical results the scale-dependency of the shear relaxation modulus measured with the indentation test is investigated. It is shown that the measurement scale is effectively controlled by the size of the indenter-specimen contact area, while the effect of indentation depth is minimal. The minimum contact area size required for obtaining representative properties, measured at the mortar scale, is determined. The viscoelastic parameters obtained from the indentation model are compared to those obtained using a representative volume element (RVE) for the asphalt mortar. In this way, the paper provides a new impulse for linking the mortar and asphalt scales in the multiscale modelling of asphalt mixtures. Feasibility of the proposed testing technique is further evaluated experimentally. Viscoelastic indentation tests are performed on asphalt mastics and mortar at two different sizes of contact areas. Experimental results indicate that indentation tests allow reliable characterisation of mortars relaxation modulus on both macro-scale as well as on individual component level.

sted, utgiver, år, opplag, sider
TAYLOR & FRANCIS LTD , 2019.
Emneord [en]
indentation testing, asphalt mortar, bitumen-filler mastics, multiscale, viscoelasticity, FEM
HSV kategori
Identifikatorer
URN: urn:nbn:se:kth:diva-255414DOI: 10.1080/14680629.2019.1628434ISI: 000473928500001OAI: oai:DiVA.org:kth-255414DiVA, id: diva2:1343073
Merknad

QC 20190815

Tilgjengelig fra: 2019-08-15 Laget: 2019-08-15 Sist oppdatert: 2019-08-15bibliografisk kontrollert

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Fadil, HassanLarsson, Per-LennartPartl, Manfred

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