TY - JOUR
T1 - Unsaturated properties of recycled concrete aggregate and reclaimed asphalt pavement
AU - Rahardjo, Harianto
AU - Satyanaga, Alfrendo
AU - Leong, Eng Choon
AU - Wang, Jing Yuan
N1 - Funding Information:
This work was supported by a research grant from a collaboration project between the Housing and Development Board and Nanyang Technological University (NTU) and Competitive Research Project (CRP) on “Developing Low-cost Landfill Capping Technologies”, National Research Funding (NRF), Singapore . The authors gratefully acknowledge the assistance of Mr. Albert and the Geotechnical Laboratory staff, School of Civil and Environmental Engineering, NTU, Singapore during the experiments and data collections.
Copyright:
Copyright 2013 Elsevier B.V., All rights reserved.
PY - 2013/7/18
Y1 - 2013/7/18
N2 - Construction and demolition of buildings together with the reconstruction of roads and pavements produce a lot of crushed concrete and asphalt waste. Problems associated with the disposal of these waste materials can be solved by recycling them for geotechnical engineering purpose. Recycled concrete aggregate and reclaimed asphalt pavement can be used as replacement for natural aggregates in road constructions, landfill capping systems, retaining walls, drainage works and slope protections. Many studies have been carried out to study the characteristics of recycled materials under saturated conditions. However, only few studies have been conducted to study the water characteristic curve (WCC) and permeability of recycled materials under unsaturated conditions. In addition, the shear strength of recycled materials under unsaturated conditions has not been fully investigated. Therefore, this paper focuses on the unsaturated properties of recycled materials, in particular, wetting WCC, wetting permeability function and unsaturated shear strength of recycled materials. In addition, the drying WCC, drying permeability function and saturated shear strength of recycled materials are also discussed. The experimental data of wetting WCC of recycled materials are compared with the predicted wetting WCC obtained using published equations. The experimental data of the saturated and unsaturated shear strength of recycled materials are fitted with nonlinear shear strength equations. In general, the investigated recycled materials have similar characteristics with natural aggregates under saturated and unsaturated conditions. The finer recycled concrete aggregate and reclaimed asphalt pavement have smaller particles sizes, higher water-entry values, lower permeability, lower values of minimum φ' at failure and maximum φb as compared with the coarser recycled concrete aggregate and reclaimed asphalt pavement.
AB - Construction and demolition of buildings together with the reconstruction of roads and pavements produce a lot of crushed concrete and asphalt waste. Problems associated with the disposal of these waste materials can be solved by recycling them for geotechnical engineering purpose. Recycled concrete aggregate and reclaimed asphalt pavement can be used as replacement for natural aggregates in road constructions, landfill capping systems, retaining walls, drainage works and slope protections. Many studies have been carried out to study the characteristics of recycled materials under saturated conditions. However, only few studies have been conducted to study the water characteristic curve (WCC) and permeability of recycled materials under unsaturated conditions. In addition, the shear strength of recycled materials under unsaturated conditions has not been fully investigated. Therefore, this paper focuses on the unsaturated properties of recycled materials, in particular, wetting WCC, wetting permeability function and unsaturated shear strength of recycled materials. In addition, the drying WCC, drying permeability function and saturated shear strength of recycled materials are also discussed. The experimental data of wetting WCC of recycled materials are compared with the predicted wetting WCC obtained using published equations. The experimental data of the saturated and unsaturated shear strength of recycled materials are fitted with nonlinear shear strength equations. In general, the investigated recycled materials have similar characteristics with natural aggregates under saturated and unsaturated conditions. The finer recycled concrete aggregate and reclaimed asphalt pavement have smaller particles sizes, higher water-entry values, lower permeability, lower values of minimum φ' at failure and maximum φb as compared with the coarser recycled concrete aggregate and reclaimed asphalt pavement.
KW - Reclaimed asphalt pavement
KW - Recycled concrete aggregate
KW - Unsaturated shear strength
KW - Wetting permeability function
KW - Wetting water characteristic curve
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U2 - 10.1016/j.enggeo.2013.04.008
DO - 10.1016/j.enggeo.2013.04.008
M3 - Article
AN - SCOPUS:84878259988
VL - 161
SP - 44
EP - 54
JO - Engineering Geology
JF - Engineering Geology
SN - 0013-7952
ER -