4x8 Concrete Cylinders for Compressive Strength Testing
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2020-01-01
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Alternative Title:Concrete Subtask Group, Work Product, Final Report: 4x8 Concrete Cylinders for Compressive Strength Testing
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Edition:Work Product Final Report
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Abstract:This report to Pavement & Materials Partnering Committee (PMPC) addresses the concrete cylinder size allowed for compressive strength testing on Caltrans projects. Historically, Caltrans has required the use of 6x12-in. cylinders when verifying concrete’s compressive strength for contract acceptance. To align the Department’s practice with national and industry standards, a study was performed on the feasibility of implementing the use of 4x8-in. cylinders for verification testing. After performing a literature review, national survey of other State Departments of Transportation (DOT), and collecting comparison data, it is recommended to implement the use of 4x8-in. concrete cylinders for compressive strength acceptance testing under California Test (CT) 540. This change will reduce the space required to cure concrete specimens, allow the use of smaller, less expensive test equipment, and reduce physical strain on technicians incurred during fabrication and handling.
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