Methodology for Using LWD Data at Different Curing Times to Assess On-Site Properties of Cement-Bitumen Treated Materials

What is it about?

This study looks at how to better evaluate the properties of cement-bitumen treated materials (CBTM) used in road construction, particularly for recycling strategies, with more accurate than common engineering techniques, while still being practical and useful. It uses data collected with Light Weight Deflectometer (LWD) at different curing times to understand how these materials behave on-site as they gain strength. We developed a methodology that uses those LWD measurements to monitor stiffness evolution in CBTM layers, using an adapted computational tool for calculations. The approach compares results over time and links them to material behavior, allowing for better interpretation of field data. The study shows that LWD testing can effectively track changes in stiffness during curing, and that curing stage is crucial for the pavement behavior. By accounting for these variations, the proposed methodology improves the reliability of on-site assessments and can help engineers working with this kind of recycling technique.

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Photo by Alex Cox on Unsplash

Photo by Alex Cox on Unsplash

Why is it important?

CBTM layers are increasingly used in pavement engineering because they combine flexibility with strength and are useful for recycling strategies. However, assessing their in-situ performance during early curing stages is challenging, and necessary for opening for traffic. Reliable, fast, and non-destructive evaluation methods are essential to ensure quality construction and long-term pavement performance. This work helps engineers make more informed decisions during construction, reducing uncertainty in quality control. It supports faster, non-destructive testing practices and contributes to more durable and cost-effective pavement systems, especially in the case of recycling.