Section 4156.  Glass Fiber Reinforced Polymer Dowel Bars.

4156. 01 Description.

Dowels consisting of a single uncoated non-metallic material, glass fiber reinforced polymer. Use only in load transfer assemblies for CD joints and individual dowels for dowel bar retrofits on non-Interstate PCC pavements with 20 year design truck traffic of less than 1000 per day, as approved by the Engineer.

4156. 02 General Requirements.

A. Use the size and type specified in the contract documents. Meet the requirements for the type and use specified.

B. Approved manufacturers and suppliers are listed in Materials I.M. 451.03B, Appendix C.

C. Consisting of a single nonmetallic material meeting the following requirements:

1. Glass fiber content greater than 70%, per ASTM D2584.

2. Glass transition midpoint temperature ≥ 212°F, per ASTM E1356.

3. Long term absorption at 122°F ≤ 1.0%, per ASTM D570.

4. Transverse shear strength ≥ 19,000 psi, per ASTM D7617.

5. Mean tensile modulus of elasticity ≥ 6,500,000 psi ASTM D7205.

6. No deformation, burrs, or projections on ends of cut dowels.

7. Uncoated diameter measured at both ends and third points with the average not to exceed -1/16 inch of specified diameter.

8. Uncoated length measured end to end not to exceed +/-1/4 inch of specified length.

9. Average approach and leave section deflections not to exceed 7.5 mils at 1 million cycles and not to increase by more than 3.5 mils at 10 million cycles when tested according to Annex A of ACPA T253 PTM No. 642.

D. Coated with a bond-breaker as described in Article 4151.02, B, 5 unless pull-out forces do not exceed 3000 pounds for any specimen, and no specimen shows any surface tears or perforation due to the pullout testing when tested in accordance with the provisions of Section 6 ACPA T 253-21 (no salt/freeze exposure).

E. Protect dowels in dowel assemblies stored outdoors, longer than 90 days either at fabricator or project site, from UV exposure with a suitable tarp/covering. Record on an identification tag the date dowel assemblies were placed outdoors.

F. Store dowel assemblies off the ground on pavement or wood supports. When stacking is necessary, place wood supports between assemblies or other method to ensure a stable stack.

G. Friction fit or clipped into assemblies to ensure stability and prevent dowels from becoming misaligned during handling and placement.