| NCHRP 04-15 | Corrosion Protection of Prestressing Systems in Concrete Bridges | Completed | |
| NCHRP 04-16 | Cost and Service Life of Pavement Markings | Completed | |
| NCHRP 04-18 | Design and Evaluation of Large Stone Mixtures | Completed | |
| NCHRP 04-19 | Aggregate Tests Related to Asphalt Concrete Performance in Pavements | Completed | |
| NCHRP 04-19(2) | Validation of Performance-Related Tests of Aggregates for Use in Hot-Mix Asphalt Pavements | Completed | |
| NCHRP 04-20 | Aggregate Tests Related to Performance of Portland Cement Concrete | Completed | |
| NCHRP 04-20A | State of the Art Report and Plan for Research on Aggregates Tests Related to Performance of Portland Cement Concrete Pavements | Completed | |
| NCHRP 04-20B | Aggregate Tests Related to Performance of Portland Cement Concrete Pavements | Completed | |
| NCHRP 04-20C | Aggregate Tests Related to Performance of Portland Cement Concrete Pavements: State of the Knowledge | Completed | |
| NCHRP 04-21 | Appropriate Use of Waste and Recycled Materials in the Transportation Industry | Final | |
| NCHRP 04-22 | Pavement-Marking Materials: Health, Environmental, and Performance Assessment | Completed | |
| NCHRP 04-23 | Performance-Related Tests of Aggregates for Use in Unbound Pavement Layers | Completed | |
| NCHRP 04-24 | HDPE Pipe Material Specifications and Design Requirements | Completed | |
| NCHRP 04-25 | Implementation Plan for Automating Highway-Materials Testing | Completed | |
| NCHRP 04-26 | Thermoplastic Drainage Pipe, Design and Testing | Completed | The project final report is available as NCHRP Report 631. |
| NCHRP 04-27 | Application of Fiber Reinforced Polymer (FRP) Composites to the Highway Infrastructure: Strategic Plan | Completed | |
| NCHRP 04-28 | Feasibility Study for an All-White Pavement Marking System | Completed | |
| NCHRP 04-29 | Selection of Materials to Optimize Sign Performance | Completed | |
| NCHRP 04-30 | Test Methods for Characterizing Aggregate Shape, Texture, and Angularity | Completed | |
| NCHRP 04-30A | Test Methods for Characterizing Aggregate Shape, Texture, and Angularity | Completed | |
| NCHRP 04-31 | Tests of Recycled Aggregates for Use in Unbound Pavement Layers | Completed | |
| NCHRP 04-32 | Performance and Quality Control of Corrugated Pipe Manufactured with Recycled Polyethylene Content | Completed | The project final report is available as NCHRP Report 696. |
| NCHRP 04-33 | Procedures for Testing and Evaluating Detectable Warning Systems | Completed | |
| NCHRP 04-34 | Application of LADAR in the Analysis of Aggregate Characteristics | Completed | |
| NCHRP 04-35 | Improved Test Methods for Specific Gravity and Absorption of Coarse and Fine Aggregate | Completed | |
| NCHRP 04-36 | Characterization of Cementitiously Stabilized Layers for Use in Pavement Design and Analysis | Completed | |
| NCHRP 04-37 | Long-Term Performance of Epoxy Adhesive Anchor Systems | Completed | The project final report is available as NCHRP Project 757. |
| NCHRP 04-38 | Recommended Laboratory Test for Predicting the Initial Retroreflectivity of Pavement Markings from Glass Bead Quality | Completed | The project final report is available as NCHRP Report 743. |
| NCHRP 04-39 | Field Performance of Corrugated Pipe Manufactured with Recycled Polyethylene Content | Completed | |
| NCHRP 04-40 | Reliability-Based Geotechnical Resistance Factors for Axially-Loaded Micropiles | Final | |
| NCHRP 04-41 | Deterioration Rates and Unit Costs for Geotechnical Assets | Final | Project is cancelled |