Shear Behavior of Plastic Roller-Compacted Concrete
Publication: Airfield and Highway Pavements 2021
ABSTRACT
Roller-compacted concrete (RCC) pavements require high-density pavers to distribute, densify, and provide the initial finish. High-density pavers coupled with appropriately proportioned RCC mixture volumetrics should reduce the compactive effort necessary to meet density specifications and increase productivity. Additionally, chemical admixtures may also assist in improving compactability and productivity. The primary test employed for fresh RCC workability is the Vebe test, which is primarily a quality control and consistency test. In this study, the direct shear box apparatus measured the shear properties of RCC mortar mixtures in the plastic state. Multiple RCC mortar mixtures with different paste contents and a rheology-modifying admixture (RMA) were evaluated. Direct shear box tests on the compacted RCC mortar samples using an RMA indicated no significant impact on the friction angle for a given maximum aggregate size. The RCC mixture volumetrics, such as intragranular voids, paste volume, and voids filled by paste, predominantly influenced the apparent cohesion when voids in the aggregate were either underfilled or overfilled. Higher apparent cohesion was generated from negative pore-water pressure built-up from relatively high strain rates and restricted drainage. The RMA did not affect the peak or residual friction angle of the compacted RCC.
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Airfield and Highway Pavements 2021
Pages: 23 - 33
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© 2021 American Society of Civil Engineers.
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Published online: Jun 4, 2021
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