Asphalt Testing Solutions
Learn what the future of mix design looks like for your state by reviewing the concepts of NAPA’s Balanced Mix Design (BMD) and FHWA’s Performance Related Specifications (PRS).
With so many new variables in binder and mixtures to consider, such as higher RAP, asphalt rejuvenators and polymers, selecting the correct test(s) and interpreting the results are more important than ever. Implementing asphalt performance testing will not only apply to mix designs but will also open possibilities for more innovation in asphalt binder and mixture modifiers.
This presentation will cover the most common performance tests involved in BMD, such as Hamburg Wheel Tracking and I-FIT tests, best practices involved sample preparation, and compare traditional volumetric design with BMD. Current asphalt specifications and implementation will also be discussed.
Discover what the next steps are and how to prepare for your future with BMD.
Due to the increase in asphalt modifiers available in the market, how do I know what I need and if I am getting what I asked for? How do different additives perform? What do I need to know about testing them?
Most commonly, when modifiers are discussed in the asphalt industry, they are referring to asphalt binder modifiers. These modifiers can be a range of polymers, chemicals additives, organic materials, softening agents, asphalt rejuvenators, etc. Each category contains an endless line of products.
Modifiers are not isolated to the asphalt binder – mixtures are being modified as well. An ideal asphalt mixture modifier will focus on improved resistance to rutting and cracking. Some of these modifiers fall in the categories of fibers, treated plastics, fillers and recycled materials.
Learn about these different types of modifiers, some of the commons tests to evaluate them and the benefits they bring during production and paving. Also hear about a few projects that attribute their successes to mixtures containing modifiers.
Want to know how to extend the life of your pavement with less costly processes than a traditional “mill and fill?” It’s all about applying the right treatment to the right place at the right time to save or delay future expenditures. Pavement preservation increases the average condition of pavement while decreasing the average spending. It is a cost-effective, “green” way to maintain our roads’ integrity and longevity. Roads are a capital asset in which we must take a proactive approach to protect.
Learn about a typical pavement lifecycle deterioration curve and the different treatments used to preserve it before it hits the point of accelerated deterioration. While no preservation specifications are currently owned by the FDOT, the Florida Pavement Preservation Council (FPPC) partnered with them to write asphalt specifications that can be applied to city and county roads.
First there was Hubbard Field, then Hveem and then Marshall mix design. Today, we follow the Superpave system. Superpave mix design was developed to create a performance-based asphalt binder and asphalt mixture specification. While the binder performance-based specification took shape in the form of the PG specification (AASHTO M 320), the performance-based mix design system turned out to be more complex than anticipated and a volumetric mix design system was implemented as AASHTO M 323.
Over time, with experience and technology, each state has modified or adjusted the specifications for AASHTO M 320 and M 323.
Learn about the differences how the Superpave system is used with the different AASHTO specifications released. Where is Superpave going and what is with Balanced Mix Design, Superpave5 and low air void mixtures?
Asphalt is 100% recyclable and the United States’ most recycled product. Reclaimed Asphalt Pavement (RAP) is produced when an old road is ground up by a milling machine. These millings or RAP is then saved, brought back to an asphalt plant and recycled into future asphalt mixtures. The majority of the asphalt mixtures around the country use RAP, averaging just over 20% by weight of the aggregate.
Depending on the state, location and placement of mixture, different percentages of RAP are accepted in asphalt mix designs. With the availability of softer asphalt binders and the increased use of asphalt rejuvenators, just how much RAP can we use in our asphalt mixes; can we use 100% RAP to produce an acceptable pavement? Does anyone currently approve a 100% RAP mix design for a surface mixture?
Discuss what components must be considered to ensure a smooth, long-lasting ride when using a 100% RAP mixture.
Quality Control is the system used by a contractor to monitor, test and make adjustments to their production and placement processes as needed to ensure the final product will meet defined specifications. It’s a process that helps a company ensure it creates quality products and that its staff and management alike make minimal mistakes. Training and goals help a company achieve high quality. Quality Assurance is planned and continued actions and observations to provide confidence that a product or facility will perform up to the required standards in service. It’s a system process for failure prevention which ensures that the final deliverable product or service is error free or within limits. It’s a process to audit the asphalt quality control measurements against the requirements. If they match up, then the quality assurance process is considered successful. Both systems are vital to the success of any asphalt production and paving project.
Learn the “accountability chart” to define roles of quality assurance and understand the responsibilities of each role during a project. Discuss the elements involved with these concepts such as agency acceptance, dispute resolutions and independent assurance, and discuss the top causes of poor pavement performance. Understanding the causes of poor performance is the first step in making the necessary adjustments for improvement.