Problem Highway US-50, nicknamed the “Loneliest Highway in America,” is a two-lane composite rural highway stretching from California to Maryland. Pavement settlement in a section of the highway about five miles outside of Austin, NV, caused three severe diagonal fissures in the road surface to develop. The worst of these fissures measured a staggering 13 inches wide and 9 feet deep. The Nevada Department of Trans- portation (NDOT) needed to find a fast and permanent solution to this problem before the onset of winter. Analysis The engineering team at NDOT decided to pursue a pressure grouting injection program to solve the roadway fissure problem by stabilizing the underlying soil. Given the choice between a cementitious suspension grout or a polymer grout, NDOT chose to use poly

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