The screed "floats" on the asphalt mix. Changes in paving speed, mix temperature, or the head of material (the volume of mix in front of the screed) will cause the screed to rise or fall, creating bumps.
Quality construction starts at the production facility. MS-22 provides detailed guidance on managing both and drum-mix plants . Managing Material Stockpiles
The head of material in the auger chamber must be kept constant. If the auger runs too lean or too full, it creates mat defects and segregation. Utilizing a between the truck and the paver helps remix the material, eliminating both thermal and aggregate segregation before it hits the screed. 7. Compaction: The Most Critical Step for Durability
When a mat looks "torn" or density isn't being met, MS-22 offers a troubleshooting guide to identify and fix the mechanical or material issue. How to Access MS-22
It acts as a comprehensive field guide and inspector’s manual, focusing on the "how-to" aspects of construction, covering everything from site preparation to final compaction. ms-22 construction of quality asphalt pavements pdf
The MS-22 manual systematically breaks down the entire asphalt pavement construction process, from initial planning to final inspection. It's designed to be a practical guide you can reference at every stage of a project.
While MS-22 does not replace volumetric mix design, it explains how to construct a pavement that meets Superpave criteria. For instance, achieving the specified air voids (typically 4%) is impossible without proper compaction – a theme MS-22 covers exhaustively.
The final chapter addresses the quality assurance (QA) process during each critical phase of construction. It covers sampling and testing protocols, statistical acceptance methods, and the role of quality control (QC) testing in building long-lasting, high-performance pavements. High-quality pavements are not achieved by inspection alone but through proactive quality management.
A new asphalt construction manual for this decade and beyond The screed "floats" on the asphalt mix
This chapter covers the operation of asphalt plants, including both batch plants and drum mix plants. It addresses plant calibration, production rates, temperature control, and the importance of consistent mix quality. The manual emphasizes that quality production is the first step in a balanced paving operation.
Removes roller marks and provides a smooth surface.
If air voids are above 8%, the pavement becomes permeable to air and water, leading to rapid oxidation and stripping.
A proper distribution of particle sizes ensures maximum packing density and internal stability. MS-22 provides detailed guidance on managing both and
: Ideal for contractors, engineers, and students involved in asphalt pavement design and construction. Pairs well with MnDOT’s other resources, such as the Design Manual and Statewide Pavement Management Plan . Access it here for free to evaluate its relevance to your projects.
Monitoring mix temperatures to avoid damage to the binder (overheating) or difficulty in compaction (under-heating). C. Asphalt Placement (Paving)
Ensuring the correct rolling pattern to achieve specified density without causing surface damage. 3. Benefits of Following MS-22 Guidelines