Circular and square cross-section for joints in rigid pavements. No metallic component, no painting, no galvanizing.
Zentor is manufactured in GFRP — Glass Fiber Reinforced Polymer, a non-metallic composite material also known in the market as fiber bar.
This is a technology consolidated for over 30 years in countries such as Canada, the United States, Italy and Germany, now regulated in Brazil by ABNT NBR 17201:2025 and ABNT NBR 17196:2025. Dowel bars specifically are regulated internationally by ASTM D8444-24.
The main characteristic of GFRP is the complete absence of any metallic component: no oxidation, no cover expansion, no degradation from chlorides, acids or alkalis — ensuring a minimum structural service life of 80 years even in highly aggressive environments.
| Diameter | Area (mm²) | Esforço cortante (NBR 17201‑4) | Cisalh. horiz. (NBR 17201‑5) | Max. load (kN) |
|---|---|---|---|---|
| Ø16 mm | 201 | 240 MPa (média) | 82 MPa (média) | 95 |
| Ø20 mm | 315 | 231 MPa (média) | 79,7 MPa (média) | 146 |
| Ø25 mm | 491 | 200 MPa (média) | 77,8 MPa (média) | 196 |
| Ø32 mm | 804 | 200 MPa (média) | 75 MPa (média) | 335 |
Tests: ABNT NBR 17201-4 and NBR 17201-5 (EV Engenharia, Rep. 023_RT_QL_06_R00, 04/07/2025). Standard spacing: 30 cm.
What the GFRP dowel bar delivers at the joint of an industrial floor or a concrete pavement:
Depending on project requirements, bars are produced with Glass, Basalt, Carbon or Aramid Fibers, or by combining these fibers.
