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Development of Cement Recycled Asphalt Base Stabilization (CRABS) Design Guide for Idaho Transportation Department

The Idaho Transportation Department (ITD) is working to develop a Cement Recycled Asphalt Base Stabilization (CRABS) Design Guide to provide best practices, and standardized procedures for the design and construction of CRABS in Idaho. Developing such a guide is a critical step toward improving the efficiency, sustainability, and resilience of Idaho’s road infrastructure. CRABS is a proven pavement rehabilitation technique that can enhance pavement performance while supporting cost-effective and environmentally responsible construction practices. However, ITD’s design process for CRABS continues to evolve, and a thorough evaluation is needed to confirm that treatments consistently achieve the intended service life and to refine design approaches for rehabilitating existing CRABS sections. Field assessments of older CRABS sections reveal inconsistencies in construction quality—some segments remain durable for decades, while others deteriorate prematurely. This variability compromises the accuracy of pavement performance predictions and reduces ITD’s ability to prioritize investments based on evidence. This project will address these challenges by developing a formal CRABS Design Guide. A comprehensive, unified guide will help standardize CRABS techniques and material selection while extending pavement service life and supporting longer-lasting pavement rehabilitation outcomes across Idaho’s highway system..