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Performance Assessment of Cement Stabilized, Polymer Fiber-Reinforced Pavement Foundation Layers
In this study, test sections were built to evaluate the long-term performance of portland cement (PC) stabilization with polymer fiber reinforcement in granular subbase layers by measuring in situ engineering properties (i.e., strength and stiffness) over time with special focus on freeze/thaw performance. Two different fibers - discrete fibrillated polypropylene (DF-PP) fiber and monofilament-polypropylene (MF-PP) micro-fiber - were used for reinforcement. A target 5% PC and target 0.4% fiber content was used for stabilization and reinforcement of the granular subbase layer. Within 1 to 3 days of curing, a 6 in. crushed limestone modified subbase layer was placed over the stabilized layer and compacted using a vibratory smooth drum roller. In situ testing involved testing the foundation layers immediately after construction, and after 1, 2, 3, and 7 days, and 3, 9, 10, and 21 months of curing. Spring-thaw occurred after 9 and 21 months of curing. Dynamic cone penetrometer (DCP), falling weight deflectometer (FWD), and roller-integrated compaction monitoring (RICM) tests were used for in situ testing. Laboratory tests were conducted to assess the freeze-thaw durability performance of the treated and untreated samples. Both laboratory and field testing indicated that strength and stiffness properties yielded the lowest values during thawing period, and that addition of PC and PC + fibers to the subbase material showed significant improvement in the strength and stiffness properties and freeze-thaw performance. Addition of fibers alone showed some improvement in the subbase layer laboratory freeze-thaw performance.
Performance Assessment of Cement Stabilized, Polymer Fiber-Reinforced Pavement Foundation Layers
In this study, test sections were built to evaluate the long-term performance of portland cement (PC) stabilization with polymer fiber reinforcement in granular subbase layers by measuring in situ engineering properties (i.e., strength and stiffness) over time with special focus on freeze/thaw performance. Two different fibers - discrete fibrillated polypropylene (DF-PP) fiber and monofilament-polypropylene (MF-PP) micro-fiber - were used for reinforcement. A target 5% PC and target 0.4% fiber content was used for stabilization and reinforcement of the granular subbase layer. Within 1 to 3 days of curing, a 6 in. crushed limestone modified subbase layer was placed over the stabilized layer and compacted using a vibratory smooth drum roller. In situ testing involved testing the foundation layers immediately after construction, and after 1, 2, 3, and 7 days, and 3, 9, 10, and 21 months of curing. Spring-thaw occurred after 9 and 21 months of curing. Dynamic cone penetrometer (DCP), falling weight deflectometer (FWD), and roller-integrated compaction monitoring (RICM) tests were used for in situ testing. Laboratory tests were conducted to assess the freeze-thaw durability performance of the treated and untreated samples. Both laboratory and field testing indicated that strength and stiffness properties yielded the lowest values during thawing period, and that addition of PC and PC + fibers to the subbase material showed significant improvement in the strength and stiffness properties and freeze-thaw performance. Addition of fibers alone showed some improvement in the subbase layer laboratory freeze-thaw performance.
Performance Assessment of Cement Stabilized, Polymer Fiber-Reinforced Pavement Foundation Layers
White, D.J. (author) / Vennapusa, P.K.R. (author) / Becker, P. (author) / Zhang, Y. (author) / Dunn, M. (author)
2015
10 Seiten, Bilder, Tabellen, Quellen
Conference paper
Storage medium
English
Polymerfaser , Polypropylen , Straßenbelag , Labortest , Zement , Portlandzement , Steifigkeit , Monofilament , Fasergehalt , Kalkstein
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