ABSTRACT
In May 2011, only days before a very busy traveling holiday, the Missouri Department of Transportation observed rutting and cracking in a stretch of flexible highway pavement. The section of pavement was being prepared to be put in service on the Friday before Memorial Day Weekend. As the base layer of asphalt was being placed the roadway began to rut and crack due to a subbase failure, most likely attributable to poorly compacted and/or saturated soils.
To rapidly improve the load-bearing support capability of the underlying soils, a patterned injection (with depth) of an expanding polymer grout was selected as the treatment option. This mitigation technique proved effective and efficient, as work was expeditiously performed and the roadway was adequately stabilized prior to the holiday weekend.
This paper demonstrates the improvements achieved using insitu measurements from a Falling Weight Deflectometer (FWD). These improvements can be readily seen using before-treatment and after-treatment measures suggesting valuable enhancements to the mechanistic engineering properties of the pavement system.
