Master Builders Inc., a leading admixture supplier, has launched a new electronic tool on its Web site. Durability GPS (Global Product Selector) helps users design and specify concrete that will provide the best possible performance and the longest service life. The e-tool functions as a multi-level selector system that considers project parameters and recommends specific admixtures to include in the concrete mix design to achieve improved durability. Users can specify chemical admixtures formulated to prevent various conditions that threaten and compromise concrete durability, such as corrosion, cracking, alkali-silica reactivity and chemical attack. They begin by selecting the type of structure they are designing and then consider the potential problems and possible environmental and performance influences that could compromise the concrete (such as cracking, corrosion, etc.) The modeling tool then presents possible causes for those conditions and offers admixture solutions to combat those challenges. To try the Durability GPS e-tool, visit www.masterbuilders.com and click on the “Support” icon. Then select “Etools” and click on Durability GPS.