the ability to handle more pavement layers than FPS19,.The software has a user-friendly interface and has completed beta testing. New perpetual pavement designs required software updates as well, so Wenting Liu, TTI assistant research engineer, developed FPS21. “With well-constructed perpetual pavement, you never have to go more than 2 inches deep when repairing it.” The largest trucks will never be able to cause any structural problems,” says Tom Scullion, Texas Transportation Institute’s (TTI’s) Flexible Pavements Program manager. “You build a thick asphalt pavement, and you never have to repair anything except the surface. A typical Texas PP structure consists of several layers of HMA, a high-quality base layer over a treated subgrade material. A PP structure is a long-lasting, thick, hot-mix asphalt (HMA) pavement structure with a design service life of up to 50 years. Recently, a new generation of perpetual pavement (PP) structures has evolved to meet ever-increasing traffic loads. It also calculates the required overlay thickness for existing highways and lets the designer estimate stress and strain within the pavement layers, as well as make predictions of pavement life. Texas’ roadways - the state’s biggest collection of hardware -are being modernized, and that’s required the updating of the software used to design them.įPS19, the current version of the pavement design software used by the Texas Department of Transportation (TxDOT), computes the required thickness of pavement layers to withstand the damaging effects of both traffic and the environment. ![]() Sometimes, though, it’s the other way around. Releasing next-generation software often requires a much-needed modernization of the hardware. One of the best parts of a software upgrade is seeing the new features. TTI Updates Pavement Design Software FPS21 will help pavement engineers better assess how perpetual pavement structures meet ever-increasing traffic loads.
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