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Review
. 2019 Sep 27;5(9):e02494.
doi: 10.1016/j.heliyon.2019.e02494. eCollection 2019 Sep.

Performance characteristics of recycled concrete aggregate as an unbound pavement material

S Jayakody  1 , C Gallage  2 , J Ramanujam  2
Affiliations
Review

Performance characteristics of recycled concrete aggregate as an unbound pavement material

S Jayakody et al. Heliyon. .

Abstract

Use of recycled concrete aggregates (RCA) as a pavement material is one of the most sustainable engineering applications for the pavement industry. Investigation on the performance characteristics of RCA, such as elastic and plastic deformations of RCA is therefore, needed to assess RCA's application as an unbound pavement material. In this study, repeated load tri-axial (RLT) tests were conducted to investigate the response of RCA to elastic and plastic deformations under dynamic loads. The elastic and plastic properties were analysed through the 'resilient modulus' and the accumulation of plastic strain, respectively, at different confining stresses and moisture contents of the RCA specimens. The results from the tests revealed a steady gain of stiffness of the RCA specimens with an increase of load cycles at low moisture contents, high confining pressures and high vertical axial pressure.

Keywords: Civil engineering; Geotechnical engineering; Materials characterization; Mechanical property; Pavement engineering; Physical property; Plastic strain; Recycled construction materials; Repeated load tri-axial; Resilient modulus.

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Figures

Fig. 1
Fig. 1
Recycled concrete aggregate (RCA).
Fig. 2
Fig. 2
PSD curves of the RCA samples with upper and lower limit curves of the standard base layer materials (Jayakody et al., 2017).
Fig. 3
Fig. 3
Schematic of the RLT Chamber with a specimen.
Fig. 4
Fig. 4
Variation of Mr of the RCA specimens with number of load cycles at different amounts of w.
Fig. 5
Fig. 5
Mr versus DoS of RCA at different vertical stresses and confining pressure (σ3) of (a) 25 kPa, (b) 75kPa (c) 125 kPa (d) 175 kPa.
Fig. 6
Fig. 6
Measured versus predicted Mr of RCA at different values of DoS: (a) 62.2%, (b) 71%, (c) 73.3%.
Fig. 7
Fig. 7
Accumulation of vertical plastic strain of RCA with number of load cycles at a σ3 of 125 kPa.
Fig. 8
Fig. 8
Permanent strain of the compacted RCA at different value of σ3 and at OMC = 13.2%
See this image and copyright information in PMC

References

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    1. Arulrajah A., Piratheepan J., Ali M.M.Y., Bo M.W. Geotechnical properties of recycled concrete aggregate in pavement sub-base applications. Geotech. Test J. 2012;35
    1. Arulrajah A., Piratheepan J., Disfani M.M. Reclaimed asphalt pavement and recycled concrete aggregate blends in pavement subbases: laboratory and field evaluation. J. Mater. Civ. Eng. 2014;26

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