Abstract
The creep deformation of recycled construction and demolition waste (CDW) filler is an important factor affecting road performance. In this paper, a series of laboratory tests, including a compaction test, sieving test, California bearing ratio (CBR) test, creep test and unloading test are conducted on CDW filler. The engineering properties of different ratios of CDW mixture are systematically analyzed, the CBR value of CDW filler meets the requirements of an embankment. The creep type of CDW filler under a test load is stable creep, the results of the creep characteristics are analyzed from a microscopic point of view. The filler with a 7:2:1 ratio (brick slag: concrete: mortar) has the densest structure, which is dense and less porous, and the deformation is the smallest. Reasonable proportion control is the key to reducing embankment deformation. The improved Burgers model, which can better describe the creep characteristics of CDW filler, and the effects of load and ratio on the creep parameters are analyzed using the equivalent creep compliance. This study is of great significance for the promotion of CDW and meets the requirements of sustainable development.
Highlights
With the continuous development of urbanization in China, a large amount of construction and demolition waste (CDW) has been produced during the urbanization process
Recycled aggregates are obtained by the crushing and screening of CDW, so research into the behavior of these materials is of great significance
The California bearing ratio (CBR) value of recycled CDW filler is between 40.24% and 98.85%, which fully meets the requirements of embankment, and the amount of water swelling is extremely small
Summary
With the continuous development of urbanization in China, a large amount of construction and demolition waste (CDW) has been produced during the urbanization process. Recycled aggregates are obtained by the crushing and screening of CDW, so research into the behavior of these materials is of great significance. When recycled aggregate is used to produce recycled asphalt, Subhy et al [15] and Menegusso et al [16] have studied the effects of its content and treatment method on fatigue performance. Recycled aggregates are used for roadbed fillers, Javier et al [17] found that the bearing capacity of the recycled aggregates increased with time in the structural layer, which is inconsistent with the trend of natural aggregates. Vegas et al [18] and Yin et al [19] studied the properties of recycled concrete applied to an embankment and introduced its permanent deformation characteristics
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