Case Study
| Title: | DOTLine Repair of Soncy Street Bridge on I-40 and VR repair of Bridge column on Coulter St and Business 40 |
| Purpose: | To demonstrate the use of DOTLine and VR materials for partial depth bridge deck and bridge column repairs. |
| Location: | Bridge deck on I-40 East at Soncy St. in Amarillo, TX and northern most Bridge column at intersection of Coulter and business 40 in the southbound lane. |
| Date: | October 3rd and 4th, 2007 |
Procedure & Observations:
CERATECH personnel were onsite on I-40 Eastbound at Soncy St. on a bridge deck that required several partial depth repairs. Upon arrival we were shown the repair location and requested that the bridge maintenance crew begin the surface preparation to determine the overall depth of the repair. It was determined that the failure was isolated to the deck overlay material and that the underlying product was sound and stable. The limits of the repair were clearly identified and the perimeter of the repair site was saw cut to a depth of approximately 3.5 inches and all unstable materials were removed. The repair was approximately 6.5 ft long x 6.5 ft wide x 3.5 inches deep.
The preparation of the deck was well done by the TX DOT Interstate Maintenance crew and provided a strong, stable concrete surface. The DOTLine material was mixed in a standard 8 cubic foot concrete mixer and poured directly into the repair site. The material was positioned using shovels and then finished with a screed and various concrete finishing tools. The surface preparation required approximately 2 hrs to complete the material mixing and placement was completed in approximately 30 minutes.
Two additional locations were also repaired while onsite. The locations were small and measured approximately 2.5 ft long x 2 ft wide x 7 inches deep.
Product Placement:
The ambient temperatures were approximately 83 degrees Fahrenheit. The water and material temperatures were approximately 73 and 78 degrees Fahrenheit respectively. Mix times were 7 minutes with a total of 29 units of DOTLine being mixed and placed. The area was kept closed for approximately 2 hrs after final placement prior to being opened to full traffic.
Procedure and Observations:
CERATECH personnel were onsite on Coulter St. Southbound at business 40 to repair a bridge column. The repair site was well prepared by the maintenance crew and set up to conduct a form and pour for the bottom of the column and a freehand repair for the top. The repair area was approximately 4ft long x 3 ft wide x 2 inches deep. The material was mixed 2 units at a time and poured directly into the form. The formed area required 6 units to fill and the top area required an additional 4 units to complete.
Product Placement:
The ambient temperatures were approximately 65 degrees Fahrenheit in the shade. The water and material temperatures were approximately 64 and 73 degrees Fahrenheit respectively. Mix times were between 4.5 and 5.5 minutes with a total of 10 units of VR being mixed and placed. The VR material demonstrated limited temperature gain (approximately 10 degrees) and provided extended working times in excess of 40 minutes. The area was kept closed for approximately 3 hrs after final placement.
Conclusion:
This application will be monitored by TX DOT and they have been quite happy with the early results. They have contacted CERATECH and are preparing a proprietary bid for a truckload of DOTLine and approximately 10 pallets of PaveMend products (SLQ, TR and VR). We will also be working with TX DOT purchasing to secure a state wide requisition or blanket purchase order.
