A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Moisture Content-Based Longitudinal Cracking Prediction and Evaluation Model for Low-Volume Roads over Expansive Soils
This paper summarizes a methodology for using moisture content (MC) together with soil index properties to study and predict the progression of longitudinal shrinkage cracking (LSC) along low-volume roads through finite-element analysis. Extensive laboratory tests were performed on soil samples retrieved from six representative clayey sites in Texas, including five high plasticity index (PI greater than 25) sites and one low-PI site. Field measurements of moisture content, suction, and crack development were carried out at five representative farm-to-market roads constructed over the high-PI clayey materials in southern and eastern regions of Texas for verification. Compared to the prevailing suction-based approach, the MC-based approach offers more flexibility in terms of incorporating different drying/wetting paths into numerical modeling by laboratory-based material constitutive models. The estimated critical moisture content thresholds and locations of LSC showed good agreement with the field measurements. It was found that the most crucial steps in improving the overall performance of low-volume roads built over expansive soils are to enhance subgrade mechanical properties and to minimize subgrade moisture fluctuations, as opposed to an overly conservative pavement structure.
Moisture Content-Based Longitudinal Cracking Prediction and Evaluation Model for Low-Volume Roads over Expansive Soils
This paper summarizes a methodology for using moisture content (MC) together with soil index properties to study and predict the progression of longitudinal shrinkage cracking (LSC) along low-volume roads through finite-element analysis. Extensive laboratory tests were performed on soil samples retrieved from six representative clayey sites in Texas, including five high plasticity index (PI greater than 25) sites and one low-PI site. Field measurements of moisture content, suction, and crack development were carried out at five representative farm-to-market roads constructed over the high-PI clayey materials in southern and eastern regions of Texas for verification. Compared to the prevailing suction-based approach, the MC-based approach offers more flexibility in terms of incorporating different drying/wetting paths into numerical modeling by laboratory-based material constitutive models. The estimated critical moisture content thresholds and locations of LSC showed good agreement with the field measurements. It was found that the most crucial steps in improving the overall performance of low-volume roads built over expansive soils are to enhance subgrade mechanical properties and to minimize subgrade moisture fluctuations, as opposed to an overly conservative pavement structure.
Moisture Content-Based Longitudinal Cracking Prediction and Evaluation Model for Low-Volume Roads over Expansive Soils
Wanyan, Yaqi (author) / Abdallah, Imad (author) / Nazarian, Soheil (author) / Puppala, Anand J. (author)
2014-12-11
Article (Journal)
Electronic Resource
Unknown
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