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Effect of Temperature on Geotechnical Properties of Recycled Asphalt Shingle Mixtures
Abstract Shear strength, compressibility, and hydraulic conductivity of recycled asphalt shingles (RASs) mixed with bottom ash (BA) or stabilized with self-cementing fly ash (FA) were evaluated in a systematic manner at temperatures ranging from 5 to 35°C, representing seasonal field temperature variation. Increasing temperature reduced the shear strength and increased the compressibility and hydraulic conductivity of compacted RAS-BA and RAS-FA mixtures. When the temperature increased from 5 to 35°C, the effective friction angle ( φ ′ ) of the compacted RAS-BA mixture containing 25% RAS decreased from 41 to 35°. The mixture containing 50% RASs decreased from 41 to 29°. The φ ′ of the compacted RAS-FA mixture containing 20% FA decreased from 46 to 26°; however, the effective cohesion ( c ′ ) increased from 45 to 70 kPa, and the compressive strength remained higher than that of compacted sand. In contrast, the secondary compression ratio ( C α ) increased with temperature. The C α of the RAS-BA mixture is an exponential function of temperature. Thermal cycling induced thermal precompression to the compacted RAS-BA and RAS-FA mixtures and significantly reduced the compressibility. Thermal precompression reduced C α for the compacted RAS-BA mixture containing 25% RASs from 0.0078 to 0.0004 and that of the RAS-FA mixture from 0.0016 to 0.0002, which are comparable with C α for compacted sand ( C α = 0.0003 ). Therefore, to reduce long-term settlement of an embankment made with materials containing RAS, construction is recommended during warm seasons. In this way, most settlement occurs during construction, and settlement during service life of the embankment becomes negligible. The hydraulic conductivity of the compacted RAS-BA and RAS-FA mixtures increased with increasing temperature, which is beneficial to drainage capacity of structural fills containing RASs.
Effect of Temperature on Geotechnical Properties of Recycled Asphalt Shingle Mixtures
Abstract Shear strength, compressibility, and hydraulic conductivity of recycled asphalt shingles (RASs) mixed with bottom ash (BA) or stabilized with self-cementing fly ash (FA) were evaluated in a systematic manner at temperatures ranging from 5 to 35°C, representing seasonal field temperature variation. Increasing temperature reduced the shear strength and increased the compressibility and hydraulic conductivity of compacted RAS-BA and RAS-FA mixtures. When the temperature increased from 5 to 35°C, the effective friction angle ( φ ′ ) of the compacted RAS-BA mixture containing 25% RAS decreased from 41 to 35°. The mixture containing 50% RASs decreased from 41 to 29°. The φ ′ of the compacted RAS-FA mixture containing 20% FA decreased from 46 to 26°; however, the effective cohesion ( c ′ ) increased from 45 to 70 kPa, and the compressive strength remained higher than that of compacted sand. In contrast, the secondary compression ratio ( C α ) increased with temperature. The C α of the RAS-BA mixture is an exponential function of temperature. Thermal cycling induced thermal precompression to the compacted RAS-BA and RAS-FA mixtures and significantly reduced the compressibility. Thermal precompression reduced C α for the compacted RAS-BA mixture containing 25% RASs from 0.0078 to 0.0004 and that of the RAS-FA mixture from 0.0016 to 0.0002, which are comparable with C α for compacted sand ( C α = 0.0003 ). Therefore, to reduce long-term settlement of an embankment made with materials containing RAS, construction is recommended during warm seasons. In this way, most settlement occurs during construction, and settlement during service life of the embankment becomes negligible. The hydraulic conductivity of the compacted RAS-BA and RAS-FA mixtures increased with increasing temperature, which is beneficial to drainage capacity of structural fills containing RASs.
Effect of Temperature on Geotechnical Properties of Recycled Asphalt Shingle Mixtures
Soleimanbeigi, Ali (author) / Benson, Craig H / Edil, Tuncer B
2015
Article (Journal)
English
BKL:
56.20
Ingenieurgeologie, Bodenmechanik
Effect of Temperature on Geotechnical Properties of Recycled Asphalt Shingle Mixtures
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