Traffic noise is the single largest contributor to urban noise. Noise barrier walls are both expensive and ineffective as an abatement measure, but asphalt—already the quiet pavement—can help reduce noise generated at the tire/pavement interface. This document describes how stone matrix asphalt and open-graded friction courses can be highly effective and cost-efficient noise abatement solutions.
- Technical Bulletins
- Asphalt Pavement Alliance Publications
- NCHRP Reports
- Design Guide
- Porous Pavement Mix Design
- “Hot Mix Asphalt 101”
- HMA Inspection Training
In addition to the customized information and training we can provide in our Black Bag Lunch & Learn Sessions, WAPA has a growing library of information and resources to support our members and their customers every step of the way in planning, designing, building and maintaining asphalt pavements.
WAPA publishes Technical Bulletins to provide guidance for all involved in specifying, designing and building Wisconsin’s asphalt pavements. Technical Bulletins help provide straightforward answers to common technical questions on specific topics of interest.
This document provides step-by-step guidance for pavement design based on subsoil quality and expected traffic. Easy-to-use charts derived from WisDOT’s design manual and AASHTO formulas help planners quickly determine the required layer thickness for alternative pavement designs.
This document explains the underlying concepts and the principles for using life cycle cost analysis for pavement selection. LCCA best practices and common missteps are a must-read for pavement planners and local and county agencies.
The Asphalt Pavement Alliance is constantly releasing new studies and papers addressing issues of national concern related to asphalt pavements. The publications are categorized into four areas: economics, engineering, policy and the environment.
Find the latest publications at New Publications from the APA.
The National Cooperative Highway Research Program conducts research on behalf of all of the state DOTs. A number of NCHRP publications address topics of interest to WAPA members and their customers; some of the latest and most relevant reports are listed below. See a full list of all NCHRP Publications about Pavements and Publications about Materials on the Transportation Research Board’s website.
NCHRP Synthesis 421: Recycling and Reclamation of Asphalt Pavements Using In-Place Methods examines national best practices in the use of hot in-place recycling, cold in-place recycling, and full-depth reclamation of asphalt pavements. In-place recycling and reclamation of asphalt pavements helps highway agencies optimize the value of in-place materials, minimize construction time and traffic flow disruptions, and reduce the number of construction vehicles moving in and out of the construction area.
NCHRP Report 673: A Manual for Design of Hot-Mix Asphalt with Commentary incorporates the many advances in materials characterization and HMA mix design technology developed since the conclusion of the Strategic Highway Research Program. The final report on the project that developed NCHRP Report 673 and Appendixes C through F to NCHRP Report 673 were published as NCHRP Web-Only Document 159.
NCHRP Report 691: Mix Design Practices for Warm-Mix Asphalt explores a mix design method tailored to the unique material properties of warm mix asphalt technologies. Warm mix asphalt, or WMA, refers to asphalt concrete mixtures that are produced at temperatures approximately 50°F or more cooler than typically used in the production of HMA. The goal of WMA is to produce mixtures with similar strength, durability, and performance characteristics as HMA using substantially reduced production temperatures.
NCHRP Report 676: Intelligent Soil Compaction Systems explores intelligent compaction, a new method of achieving and documenting compaction requirements. Intelligent compaction uses continuous compaction-roller vibration monitoring to assess mechanistic soil properties, continuous modification/adaptation of roller vibration amplitude and frequency to ensure optimum compaction, and full-time monitoring by an integrated global positioning system to provide a complete GPS-based record of the compacted area.
WAPA’s Asphalt Paving Design Guide [PDF] provides answers and assistance on pavement design, construction and rehabilitation. The guide covers a wide range of soil and traffic loading conditions, and contains examples of designs, procedures and applications that have been successful in Wisconsin. All hot mix asphalt mixtures provided in this publication are available throughout the state from WAPA members, who are experienced in producing and constructing quality HMA pavements.
To facilitate the construction of porous asphalts in Wisconsin, WAPA is pleased to provide Porous Asphalt Mix Design Specifications [PDF]. These environmentally friendly pavements provide a unique drainage solution. Read about the benefits of Porous Pavement [PDF].
Materials from the sessions are available online: