Evaluation of Alternative Dowel Bar Materials and Coatings, Executive Summary

摘要

The focus of this project was to evaluate the long-term performance of 1.5-in (38-mm) diameter FRP bars; 1.5-in (38-mm) diameter, Type 304 stainless steel solid or clad bars; 1.5-in (38-mm) diameter, Type 304 stainless steel, concrete-filled tubes or pipe; and 1.5-in (38-mm) diameter, epoxy-coated mild steel smooth round dowels (as the control) based on over 10 years of service. In addition, it was also desired to assess the long-term (15 to 30+ years) performance and condition of conventional epoxy-coated dowel bars to determine the potential need or necessity for alternative dowel bars materials. Thus, the two major objectives of this pooled-fund project may be summarized as: (1) Evaluate the expected long term performance of 1.5-in (38-mm) diameter FRP bars and 1.5-in (38-mm) Type 304 stainless steel solid or clad bars or concrete filled tubes and cost effectiveness of these materials as alternative dowel bar materials. The focus of this evaluation is limited to seven projects sites in four states. (2) Based on the evaluation of epoxy-coated mild steel smooth round dowels used as control and on FWD testing and coring of other existing projects after 15 to 30+ years of service, determine the expected service life on which to base the cost-effectiveness of the use of higher priced alternative materials.