Case Study

Procedure & Observations:
CERATECH personnel arrived on site to perform an application of Pavemend SL™ (5.0) and Pavemend TR™ as an introduction to our family of products. The underlying principle for this application is to exhibit the ability to utilize Pavemend as a repair element focused on high traffic areas subjected to varying loads. A location for the repair was identified and site preparation was performed per ACI specifications.

The repair site selected was a corner break on a precast slab used to overlay the existing, original pavement. This section of the interstate exhibited serious deterioration worsened by the fact that underground water was present in the area. The original construction methodology required placement of the precast slab over the existing pavement and to later inject pressurized foam, leveling the precast slab and allowing smooth traffic in a very short number of hours. Figure 1. shows the selected location for the repair, perimeter cutting and demolition activities. Figure 2. shows the conditions of the area to be repaired (full depth of the precast slab) and the foam under the portion of the slab in good conditions.

Figure 1 a, b, c: Location, and demolition of repair area

Figure 2 a, b: Conditions after full depth demolition

Due to the presence of the foam between the original pavement and the precast element, it was determined that a bond breaker would be applied between the existing pavement and the repair. This was accomplished using Silicone caulk. ( see Figure 3.)

Figure 3 a, b: Application of bond breaker

Due to the material volume required to repair the site, a grout mixer was used to mix Pavemend SL™ (15.0) and Pavemend TR™. The first layer of the repair consisted of 8 buckets of SL. The second and final layer, approximately 3 inches thick, was completed with 6 buckets of Pavemend TR™ 4.0 mixed in the mixer and two buckets were mixed with a drill and a paddle. TR was applied because the road had a transverse crown of approximately 1% and a longitudinal slope of approximately 4%. (Figure 4a, b).

Figure 4: Placement of materials

After pouring TR into the repair (see Figure 4a,b), the site was screeded to complete the repair. One and a half hours after final set was achieved, the joints were reestablished leaving the repair isolated from the adjacent slabs (see Figure 5a,b,c).

Figure 5a, b, c: Screeding, reestablishment of joint and completed repair

Technical Information:
Material Temperature: 60F
Water Temperature: 65F
Ambient Temperature: 58F
Surface (pavement) Temperature: 60F