![]() This paper describes the successful development and implementation of CalBack in three ways: (1) why and how Caltrans developed CalBack (2) how CalBack functions and (3) a representative study that shows how well the software works. CalBack is a sophisticated backcalculation program that contains specific features pertinent to California and is designed to work as a standalone, or in concert with CalME. CalME is an ME design program for flexible pavements that parallels the NCHRP 1-37A (MEPDG) and is calibrated for California conditions. As part of the development of new ME design procedures, Caltrans is developing a suite of dedicated software. These tools will help state design engineers incorporate the impact of new products and technologies, increased traffic volumes and axle loading, various axle configurations, and variable climatic conditions. In 1996, California initiated an extensive project to develop Mechanistic-Empirical (ME) design and analysis tools in order to benefit from these new products, practices, and technologies. While Caltrans empirical procedures performed generally well over time, they are limited in their ability to benefit from the vast number of emerging products, construction practices, and design innovations. Until recently, California Department of Transportation (Caltrans) procedures for pavement design and rehabilitation have been largely based on empirical approaches developed from road test sections built in California in the 1940s. ![]() Calback: Enhancing Caltrans Mechanistic-Empirical Design Process With New Backcalculation Software
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