TY - GEN
T1 - Shear behavior of plastic roller-compacted concrete
AU - Ouellet, Jordan
AU - Roesler, Jeffery R.
N1 - Funding Information:
The authors would like to acknowledge Dr. Michael Radler from Dow Chemical Company for feedback and partial funding support, Prof. Gholamreza Mesri for expertise and testing facilities, Gail M. Scott and Guangchao Xing for laboratory assistance and Dr. John W. DeSantis for technical assistance.
Publisher Copyright:
© ASCE.All right reserved.
PY - 2021
Y1 - 2021
N2 - 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.
AB - 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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U2 - 10.1061/9780784483510.003
DO - 10.1061/9780784483510.003
M3 - Conference contribution
AN - SCOPUS:85108098124
T3 - Airfield and Highway Pavements 2021: Pavement Materials and Sustainability - Selected Papers from the International Airfield and Highway Pavements Conference 2021
SP - 23
EP - 33
BT - Airfield and Highway Pavements 2021
A2 - Ozer, Hasan
A2 - Rushing, John F.
A2 - Leng, Zhen
PB - American Society of Civil Engineers
T2 - International Airfield and Highway Pavements 2021: Pavement Materials and Sustainability
Y2 - 8 June 2021 through 10 June 2021
ER -