Implementing the LWD for MoDOT Construction Acceptance of Unbound Material Layers: Phase II
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2024-08-01
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Edition:Final Report (February 2023-April 2024)
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Abstract:This Phase II project aimed to accumulate more field test data to improve the standards for the implementation of the Zorn lightweight deflectometer (LWD) for the acceptance of unbound materials layers. Five more different soils, including New Florence CL, Holts Summit GM, Sikeston SM, Rolla CL, and Rolla GM, were collected from different project sites in Missouri for this project, and a series of laboratory and field tests were conducted. In addition, a disturbance isolation unit was devised for accurate field moisture measurement, ensuring reliable data collection. Field LWD tests were conducted across four project sites, evaluating moisture content and modulus ratios against specified criteria for compaction acceptance. Results indicated varying degrees of compliance across soil types and testing points. Comparisons of test results obtained from different LWD devices and with traditional density-based methods revealed LWD's effectiveness for fine-grained soils but limitations for coarse-grained soils. Consistency between LWD devices was generally good, though discrepancies were noted at certain sites. Overall, the project advances LWD implementation for unbound materials acceptance, offering insights into soil behavior under different conditions and refining testing methodologies for improved accuracy and efficiency.
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