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Article Dans Une Revue Transportation Geotechnics Année : 2023

Effect of self-cementing properties on the mechanical behaviour of recycled concrete aggregates in unbound pavement layers

Résumé

Recycled concrete aggregates (RCA) are increasingly being used in pavement base and subbase layers to replace the natural unbound granular materials (UGM), while the influence of their self-cementing properties on the mechanical behaviour has not been thoroughly studied. In this paper, the self-cementing properties, permanent deformation and resilient deformation behaviour of two RCA, NRCA and ORCA, showing significantly different self-cementing properties, after curing for different times (1, 180, 360 and 720 days), were investigated by pH value measurements, calorimeter tests and repeated load triaxial tests (RLTT). The results show that the self-cementing properties can significantly improve the mechanical behaviour of RCA, which is comparable to that of lightly treated materials. The permanent deformations of NRCA, showing strong self-cementing properties, decreases to a very low value quickly after curing for 180 days, and then stabilizes. While the resilient modulus of NRCA increases continuously with curing time, up to the studied curing time (720 days), 4.3 times larger than that curing for 1 day. It was also found that the traffic loads can damage the bonds between particles formed due to the self-cementing properties. On the contrary, for ORCA, showing negligible self-cementing properties, curing has no influence on the mechanical behaviour.
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hal-04370195 , version 1 (02-01-2024)

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Paternité - Pas d'utilisation commerciale - Pas de modification

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Chong Wang, Cyrille Chazallon, Peng Jing, Pierre Hornych, Benjamin Latour. Effect of self-cementing properties on the mechanical behaviour of recycled concrete aggregates in unbound pavement layers. Transportation Geotechnics, 2023, 42, pp.101054. ⟨10.1016/j.trgeo.2023.101054⟩. ⟨hal-04370195⟩
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