Implementing a robust plan for sampling, testing, and acceptance to verify the final product meets specifications . Critical On-Site Procedures
Rollers must operate within a specific temperature window. If the mix cools below a certain threshold (typically around 175°F to 200°F depending on the binder), the asphalt becomes too stiff to compress. Continued rolling at low temperatures can fracture the aggregates and destroy the pavement structure. 8. Joint Construction Techniques
MS-22 data shows that longitudinal joints fail at three times the rate of the main mat. The solution? The manual prescribes a “notched wedge” or “cut-down” technique where the first lane is rolled with 6 inches overhanging, and then trimmed before the second lane is laid.
To achieve ultimate smoothness, MS-22 advocates for the use of Material Transfer Vehicles (also known as remixers or shuttles). MTVs act as a buffer between the dump trucks and the paver. They continuously remix the asphalt to eliminate both thermal and physical segregation while allowing non-contact, continuous paving. 6. Compaction: The Critical Variable for Longevity
The subgrade must be uniform and stable. "Proof rolling" is often used to locate unstable areas and achieve additional compaction before paving starts. ms-22 construction of quality asphalt pavements pdf
Formed between parallel lanes. Achieving high density at the unconfined edge of the first lane is crucial to prevent the joint from separating later. 8. Summary of Key Quality Factors
Ready to secure your copy? Visit the Asphalt Institute’s official website (asphaltinstitute.org), navigate to “Publications,” select “MS-22 – Construction of Quality Asphalt Pavements,” and choose the PDF option. Make sure to download the companion errata sheet if available. Your future pavements will thank you.
Understanding different mix designs (e.g., Superpave) and their application.
Selecting the right aggregate blend is critical for structural integrity. Implementing a robust plan for sampling, testing, and
In the field of civil engineering and transportation infrastructure, achieving long-lasting, durable asphalt pavements requires more than just high-quality materials; it necessitates rigorous adherence to construction best practices. The Asphalt Institute's is the industry-standard manual designed to provide technical information and practical guidance for producing high-quality asphalt construction projects.
Establishing efficient rolling patterns using steel-wheel and pneumatic-tire rollers to achieve required density.
Compaction is the most critical step in determining the ultimate lifespan of an asphalt pavement. Proper compaction reduces air voids, increases structural strength, and prevents water infiltration. The Rolling Sequence
, lowering fuel consumption, reducing plant emissions, and improving field workability. 4. Transportation and Delivery Logistics Continued rolling at low temperatures can fracture the
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 .
, which provides a comprehensive 209-page guide covering the entire construction process from design to quality assurance. Asphalt Institute Bookstore Core Focus Areas of MS-22
Aggregates must be free of clay or dust coatings, which prevent the asphalt binder from adhering properly. Asphalt Binder