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The Feasibility Analysis of Recycled Aggregates from Construction and Demolition Waste for Permeable Pavement
For reusing the construction and demolition waste (C&DW) materials and solving waterlogging problems, the feasibility of applying C&DW to the permeable pavement (PP) was investigated. The recycled brick aggregate (RBA) and recycled concrete aggregate (RCA) were used as PP base materials under different mixing ratios and grades. Geotextiles were also used in this study as filter contaminants. Modified compaction tests, rainfall model tests, and column leaching tests were conducted on a total of 15 samples with three gradations and five RBA and RCA mix ratios. The specimens for the rainfall model test were compacted at around optimum moisture content, and the degree of compaction was 97%. Using the sub-layer compaction method, each group of samples is compacted in five layers in strict accordance with the specifications. In general, C&DW has the potential to be used underground without pollution to the groundwater. The heavy metal concentrations in C&DW are less than in the local soil and related to material resources. The water yield performance was the best when 100% concrete was used to build PP, and the total water storage was the most when 100% of bricks were chosen to make PP. Due to the excellent permeability, C&DW can be selected for pavement fillers. The geotextile reduces the permeability by about 13% but effectively filters out more than 50% of the fine particles in the rainfall. The permeability performance of concrete aggregates may be better than that of bricks, and fine particles can reduce the permeability.
The Feasibility Analysis of Recycled Aggregates from Construction and Demolition Waste for Permeable Pavement
For reusing the construction and demolition waste (C&DW) materials and solving waterlogging problems, the feasibility of applying C&DW to the permeable pavement (PP) was investigated. The recycled brick aggregate (RBA) and recycled concrete aggregate (RCA) were used as PP base materials under different mixing ratios and grades. Geotextiles were also used in this study as filter contaminants. Modified compaction tests, rainfall model tests, and column leaching tests were conducted on a total of 15 samples with three gradations and five RBA and RCA mix ratios. The specimens for the rainfall model test were compacted at around optimum moisture content, and the degree of compaction was 97%. Using the sub-layer compaction method, each group of samples is compacted in five layers in strict accordance with the specifications. In general, C&DW has the potential to be used underground without pollution to the groundwater. The heavy metal concentrations in C&DW are less than in the local soil and related to material resources. The water yield performance was the best when 100% concrete was used to build PP, and the total water storage was the most when 100% of bricks were chosen to make PP. Due to the excellent permeability, C&DW can be selected for pavement fillers. The geotextile reduces the permeability by about 13% but effectively filters out more than 50% of the fine particles in the rainfall. The permeability performance of concrete aggregates may be better than that of bricks, and fine particles can reduce the permeability.
The Feasibility Analysis of Recycled Aggregates from Construction and Demolition Waste for Permeable Pavement
KSCE J Civ Eng
Li, Lihua (author) / Shen, Xuanyu (author) / Liu, Jiabei (author) / Li, Wentao (author) / Zhong, Chuheng (author) / Zhou, Xinlong (author)
KSCE Journal of Civil Engineering ; 27 ; 535-550
2023-02-01
16 pages
Article (Journal)
Electronic Resource
English
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