The paper presents the results of a laboratory investigation seeking to quantify the eﬀects of ﬁne quantity and type on the workability and resilient response of aggregate-ﬁne soil mixtures for subbase formation. Laboratory devices were used to simulate in-ﬁeld conditions and compact samples and evaluate their resilient response under pulsing loads. Four diﬀerent types of ﬁnes passing through a 63mm sieve (one non-plastic silt and three silty-clays exhibiting plastic behaviour) in three diﬀerent quantities (5.4, 10.8 and 16.2%) were combined with coarser aggregates while maintaining the same grading distribution. A variant of the generalized model proposed in the Mechanistic Empirical Pavement Design Guide was calibrated to distinguish the contribution of ﬁne type to resilient modulus from that of moisture content and suction. The results evidenced an improvement in mixture workability during the compaction process when using plastic ﬁnes instead of non-plastic ones. However, the quantity of plastic ﬁnes should be limited (lower than 10.8% within the aggregate skeleton) in order to achieve a high compaction level and to attain a hardening resilient behaviour ratherthanthesofteningoneobservedinthecaseofgranularmaterialscontainingnon-plastic ﬁnes.
Effects of quantity and plasticity of fine particles on the workability and resilient behaviour of aggregate-soil mixtures for granular pavement layers / Bassani, Marco; Riviera, P. P.; Tefa, L.; Chiappinelli, G.. - In: ROAD MATERIALS AND PAVEMENT DESIGN. - ISSN 1468-0629. - (2019), pp. 1-20.
|Titolo:||Effects of quantity and plasticity of fine particles on the workability and resilient behaviour of aggregate-soil mixtures for granular pavement layers|
|Data di pubblicazione:||2019|
|Digital Object Identifier (DOI):||http://dx.doi.org/10.1080/14680629.2019.1633390|
|Appare nelle tipologie:||1.1 Articolo in rivista|
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