Douglas County Engineers commissioned the repair of a 22-foot-wide, 21-foot-long stretch of Q Street at the west side bridge approach to the Elkhorn River. It was determined that the area under this slab had lost significant amounts of fill causing an approximate 2 foot void under much of this area. Complicating this project is the fact that the bridge abutment and wing wall were both allowing fill materials and soil to escape from under the slab. Repair options included removal and replacement of the slab panels, traditional flowable, utilizing high density polyurethane to fill the void or using cellular concrete as a flowable fill material. Replacing the slabs was deemed too costly and disruptive. Utilizing traditional flowable fill material was strongly considered but the additional weight being added to the soil was considered excessive and the cost was higher than other options. A high density polyurethane material was also considered but due to the size of the void, this too was considered too costly. A more viable option ultimately chosen by the Douglas County Engineers was to use a StableFILL™ cellular concrete as the flowable fill material to fill this void. Since the road slab was still in place and no slab lifting was required, this option was perfect because it is light weight, extremely flowable and made the most economic sense.
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