Assessment of the compression characteristics and coefficient of lateral earth pressure of aggregate-expanded polystyrene beads composite fill-backfill using large oedometer experiments. (4th October 2021)

• Record Type: Journal Article
• Authors: Kazempour, Shaghayegh; Chenari, Reza Jamshidi; Ahmadi, Hadi; Payan, Meghdad; Senetakis, Kostas
• Is Part Of: Construction & building materials. Volume 302(2021)
• Publication Date: 2021-10-04
• Subjects: EPS beads -- Composite aggregate -- Lateral earth pressure -- Coefficient of volume compressibility -- Constrained modulus; Building materials -- Periodicals; 624.18
• DOI: 10.1016/j.conbuildmat.2021.124145
• Languages: English
• ISSNs: 0950-0618

Abstract

Highlights: The compression behaviour of aggregate-expanded polystyrene beads composites was studied. A large size oedometer was used with inserted sensors to measure directly the lateral earth pressure. The increase of aggregate size influenced the dominant load transfer mechanism and decreased K0 . A competitive interplay between angularity and uniformity coefficient of the aggregate was observed. The increase of EPS content reversed the relationship between aggregate size and K0 . Abstract: We examined the compression behaviour of aggregate-expanded polystyrene (EPS) granular composites using large-size oedometer tests measuring directly the coefficient of lateral earth pressure at rest ( K 0 ). The results showed that increasing the aggregate particles size led to a decrease of K 0 and the coefficient of volume compressibility, in pure aggregates and aggregate-EPS composites with rigid particles of d 50 < 2 m m . Increased angularity and coefficient of uniformity were observed to display competitive mechanisms in controlling K 0 . The increase of EPS content led to a transition from a behaviour dominated by aggregate contacts to aggregate-EPS and EPS-EPS major contributions in the load transfer mechanism.