Time-Dependent Response of a Recycled C&D Material-Geotextile Interface under Direct Shear Mode

• Type: Article in International Scientific Journal
• Date: 2021-06

Authors

Fernanda Ferreira (Author) FEUP; Paulo M. Pereira (Author) Other; Castorina Silva Vieira (Author) FEUP; Maria de Lurdes Lopes (Author) FEUP

Journal

Title: Materials

Vol. 14 No. 19

Pages: 1-3070

ISSN: 1996-1944

Publisher: MDPI

Indexing

ISI Web of Knowledge - 4 Citations

ISI Web of Science

Scopus - 4 Citations

ProQuest

EBSCO

Scientific classification

CORDIS: Technological sciences > Engineering > Civil engineering

Associated Projects

CDW_LongTerm - Valorização de Resíduos de Construção e Demolição em aterros reforçados com geossintéticos. Estudo do comportamento a longo prazo

Other information

Authenticus ID: P-00V-1A6

DOI: 10.3390/ma14113070

Abstract (EN): Geosynthetic-reinforced soil structures have been used extensively in recent decades due to their significant advantages over more conventional earth retaining structures, including the cost-effectiveness, reduced construction time, and possibility of using locally-available lower quality soils and/or waste materials, such as recycled construction and demolition (C&D) wastes. The time-dependent shear behaviour at the interfaces between the geosynthetic and the backfill is an important factor affecting the overall long-term performance of such structures, and thereby should be properly understood. In this study, an innovative multistage direct shear test procedure is introduced to characterise the time-dependent response of the interface between a high-strength geotextile and a recycled C&D material. After a prescribed shear displacement is reached, the shear box is kept stationary for a specific period of time, after which the test proceeds again, at a constant displacement rate, until the peak and large-displacement shear strengths are mobilised. The shear stress-shear displacement curves from the proposed multistage tests exhibited a progressive decrease in shear stress with time (stress relaxation) during the period in which the shear box was restrained from any movement, which was more pronounced under lower normal stress values. Regardless of the prior interface shear displacement and duration of the stress relaxation stage, the peak and residual shear strength parameters of the C&D material-geotextile interface remained similar to those obtained from the conventional (benchmark) tests carried out under constant displacement rate.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 16