Maintaining the thermal and structural integrity of the mix during transit is a core focus of the MS-22 manual. Truck Requirements
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.
Monitor the compaction window; once the mix cools below its critical threshold (typically around 175°F / 80°C for conventional mixes), further rolling will fracture aggregates rather than increase density.
The Asphalt Institute’s MS-22 (3rd Edition, 2020) is considered an industry-standard guide for constructing quality asphalt pavements, featuring updated content on Superpave and practical, illustrated techniques for field personnel. It covers the entire pavement process, from subgrade preparation to final compaction. For more details, visit Asphalt Magazine . ms-22 construction of quality asphalt pavements pdf
For more information, the third edition of the MS-22 manual (ISBN: 978-1934154786) can be acquired through the Asphalt Institute Bookstore.
Building a high-quality road isn't just about laying down hot mix; it requires a balanced approach across five critical phases:
Proper operation of the paver, including monitoring screed speed and temperature. Maintaining the thermal and structural integrity of the
The Ultimate Guide to MS-22: Construction of Quality Asphalt Pavements
Augers should run continuously and be filled to the centerline of the auger shaft to prevent centerline segregation.
The manual is designed for all parties involved in asphalt paving. The primary audience includes: Monitor the compaction window; once the mix cools
Aggregates make up roughly 90% to 95% of the total weight of an asphalt mixture. Poor stockpile management leads to segregation (uneven distribution of coarse and fine particles) and moisture variations.
Angular, rough-textured aggregates resist rutting better than rounded, smooth aggregates (like river sand).
MS-22 Construction of Quality Asphalt Pavements: A Comprehensive Guide (PDF)
: Detailed guidance on storing aggregates to prevent segregation and managing asphalt storage tanks and delivery lines. Surface Preparation
Smooth, well-compacted surfaces provide better skid resistance and reduce hydroplaning risks.