| NCHRP 18-03 | Silica Fume Concrete for Bridge Decks | Completed | |
| NCHRP 18-04A | Durability of "Early-Opening-to-Traffic" Portland Cement Concrete for Pavement Rehabilitation: Background and Plan for Evaluation | Completed | |
| NCHRP 18-04B | Durability of "Early-Opening-to-Traffic" Portland Cement Concrete for Pavement Rehabilitation | Completed | |
| NCHRP 18-05 | Relationship of Portland Cement Characteristics to Concrete Durability | Completed | |
| NCHRP 18-06 | Service Life of Corrosion-Damaged Reinforced Concrete Bridge Superstructure Elements | Completed | |
| NCHRP 18-06A | Service Life of Corrosion-Damaged Reinforced Concrete Bridge Superstructure Elements | Completed | |
| NCHRP 18-07 | Prestress Losses in Pretensioned High-Strength Concrete Bridge Girders | Completed | |
| NCHRP 18-08 | Supplementary Cementitious Materials to Enhance Durability of Concrete Bridge Decks | Completed | |
| NCHRP 18-08A | Supplementary Cementitious Materials to Enhance Durability of Concrete Bridge Decks | Completed | |
| NCHRP 18-09A | Guidelines for Reducing Premature Deterioration of Hydraulic Cement Concrete Pavements: Background and Research Plan | Completed | |
| NCHRP 18-10 | Procedures for Evaluating Air-Entraining Admixtures for Highway Concrete | Completed | |
| NCHRP 18-11 | Improved Specifications and Protocols for Acceptance Tests on Processing Additions in Cement Manufacturing | Completed | |
| NCHRP 18-12 | Self-Consolidating Concrete for Precast, Prestressed Concrete Bridge Elements | Completed | |
| NCHRP 18-13 | Specifications and Protocols for Acceptance Tests of Fly Ash Used in Highway Concrete | Completed | |
| NCHRP 18-14 | Evaluation and Repair Procedures for Precast/Prestressed Concrete Girders with Longitudinal Cracking in the Web | Final | |
| NCHRP 18-15 | High-Performance/High-Strength Lightweight Concrete for Bridge Girders and Decks | Completed | |
| NCHRP 18-16 | Self-Consolidating Concrete for Cast-in-Place Bridge Components | Completed | |
| NCHRP 18-17 | Entrained Air Void System for Durable Highway Concrete | Final | |
| NCHRP 18-18 | Design and Construction of Deck Bulb Tee Girder Bridges with UHPC Connections | Final | Published as NCHRP Research Report 999 |
| NCHRP 18-19 | Rating Concrete Water Permeability Based on Resistivity Measurements | Completed | |
| NCHRP 18-20 | AASHTO LRFD Design, Installation, and Standard Practice of Testing for Cured In-Place Pipe Liners | Final | Phases I and II have been completed and the remaining tasks have been transferred to NCHRP Project 18-20(01) |
| NCHRP 18-20(01) | Guide for Design, Installation, and Testing of Cured In-Place Pipe Liners | Pending | |
| NCHRP 18-21 | Utilization of Alternative Supplementary Cementitious Materials in Highway Applications | Pending | Contract pending at this time. |
| NCHRP 18-22 | Concrete Shrinkage Measurement and Cracking Mitigation | Pending | |