Editing Road (section)

===Testing===
Ground penetrating [[radar]] pulses electromagnetic waves into the pavement and measures and graphically displays the reflected signal. This can reveal voids and other defects.

The epoxy/core test, detects voids by visual and mechanical methods. It consists of drilling a 25 to 50 millimeter hole through the pavement into the sub-base with a dry-bit [[roto-hammer]]. Next, a two-part [[epoxy]] is poured into the hole – dyed for visual clarity. Once the epoxy hardens, technicians drill through the hole. If a void is present, the epoxy will stick to the core and provide physical evidence.

Common stabilization materials include [[pozzolan]]-cement grout and polyurethane. The requirements for slab stabilization are strength and the ability to flow into or expand to fill small voids. Colloidal mixing equipment is necessary to use the pozzolan-cement grouts. The contractor must place the grout using a positive-displacement injection pump or a non-pulsing progressive cavity pump. A drill is also necessary but it must produce a clean hole with no surface [[spalling]] or breakouts. The injection devices must include a grout packer capable of sealing the hole. The injection device must also have a return hose or a fast-control reverse switch, in case workers detect slab movement on the uplift gauge. The uplift beam helps to monitor the slab deflection and has to have sensitive dial gauges.<ref name="igga">{{cite web|url=http://www.igga.net/File/Minnesota-State-Aid-Concrete-Pavement-Rehabilitation-CPR-Best-Practices-Manual-_2006.pdf |title=State Aid Concrete Pavement Rehabilitation Best Practices Manual 2006 |access-date=2013-05-13 |url-status=dead |archive-url=https://web.archive.org/web/20130809234355/http://www.igga.net/File/Minnesota-State-Aid-Concrete-Pavement-Rehabilitation-CPR-Best-Practices-Manual-_2006.pdf |archive-date=2013-08-09}} Minnesota DOT</ref><ref>"Practical guidelines for CPR of Urban Roads: A compelling need for preserving city concrete streets led to the development of a methodology for scoping repairs and the undertaking of a comprehensive concrete pavement repair program in Grand Rapids, Michigan". June 2005. ''Better Roads''.</ref>