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Characterizing and Predicting the Resilient Modulus of Recycled Aggregates from Building Demolition Waste with
Yuanjie Xiao1,2, Kunfeng Kong1,3, Umar Faruk Aminu1
1School of Civil Engineering, Central South University, Changsha 410075, China.
Materials (Basel, Switzerland)
|April 12, 2022
Summary
Recycled building demolition waste (BDW) shows promising potential as sustainable pavement material. Its shear strength and resilient modulus are influenced by particle size and stress, enabling new construction applications.
Area of Science:
- Civil Engineering
- Materials Science
- Geotechnical Engineering
Background:
- Rapid urbanization generates substantial building demolition waste (BDW).
- Recycled BDW offers a sustainable, cost-effective alternative for unbound granular base/subbase pavement materials.
- Understanding the mechanical properties of BDW aggregates is crucial for pavement design.
Purpose of the Study:
- To investigate the shear strength and resilient modulus of recycled BDW-derived aggregates.
- To analyze the influence of gradation and fine particle content on these properties.
- To develop a predictive model for the resilient modulus of BDW aggregates.
Main Methods:
- Conducted monotonic triaxial compression tests and repeated-load triaxial (RLT) tests.
- Utilized five different gradations to represent particle breakage and various stress paths.
- Analyzed apparent cohesion, internal friction angle, and resilient modulus under consolidated drained conditions.
Main Results:
- Apparent cohesion ranged from 35.3 to 57.5 kPa, and internal friction angle from 30.2° to 54.3°.
- Cohesion increased and friction angle decreased non-linearly with higher fine particle content.
- Resilient modulus decreased with increased fine particle content and was significantly influenced by deviator stress and confining pressure, with the latter being more dominant.
Conclusions:
- Recycled BDW aggregates possess viable shear strength and resilient modulus characteristics for pavement applications.
- A mechanistic-empirical model was developed to predict resilient modulus based on gradation and stress variables.
- Findings support the expanded engineering use of BDW in unbound granular pavement construction.
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