Abstract
Drying shrinkage is an inevitable phenomenon that leads to cracks and eventually remarkable volume changes in hardened concrete. In this study, the drying shrinkage strain behavior of roller compacted concrete pavements (RCCPs) in two different curing conditions was investigated. The variables of RCCPs were coarse to fine aggregate (C/F) ratios of 0.7, 1, 1.2 and 1.5 in two cement dosages of 12% and 15%. Vebe tests of the fresh RCCP as well as the compressive, splitting tensile and flexural tensile strengths of the hardened RCCPs were also performed. The test results indicate that by increasing cement content from 12% to 15%, the drying shrinkage strain increased in both cured and non-cured conditions. Generally, the drying shrinkage strain was significantly increased when the C/F ratio was lower than 1.0. It is highly recommended that C/F aggregate ratio is used in the range of 1.0 to 1.2 in the mixture of RCCP.
Highlights
Drying shrinkage is an inevitable phenomenon that leads to cracks and eventually remarkable volume changes in hardened concrete
Sufficient workability was seen for all roller compacted concrete pavements (RCCPs)
Increasing cement dosage resulted in higher paste volume and lower Vebe time, which caused RCCP to have better compaction and finish [26]
Summary
The crushed granite as a coarse aggregate was used with a maximum nominal size of 12 mm with SSD, specific gravity of 2.62 and 24 h water absorption of 0.6%. Low fines content sand was mined locally with fineness modulus, saturated surface-dry (SSD) specific gravity and 24 h water absorption of 2.8, 2.55 and 1.5%, respectively. Ordinary Portland cement with a 48 MPa compressive strength at 28 days was used. Specific gravity and specific surface area were 3.14 and 3510 cm2/g, respectively
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