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Chase Corporation Bridge & Highway

Elements of a Job Mix Formula

Posted by David Fricke on Mar 4, 2019 8:43:00 AM

One of the critical elements in a successful paving project is the asphalt mix design. Another term for mix design is the “job mix formula” or “JMF”. The two main components in hot mix asphalt are mineral aggregate and the liquid asphalt binder. To develop a successful JMF, an aggregate type, typically determined by the area geology, along with an asphalt binder type are required. This is accomplished by reviewing the available aggregates and their gradations (the size, structure and distribution of the stone), selecting the applicable aggregate profile and combining the selected aggregate with the calculated ratio of asphalt binder. 

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Topics: Rosphalt, Asphalt Mix Temperature, Job Mix Formula

The Importance of Temperature Monitoring in Asphalt Paving

Posted by Brock Peterson on Dec 17, 2018 12:30:00 PM

It is well known in the asphalt-paving industry that the correct temperature of a finished asphalt mixture is vital to achieving a high-quality, long-lasting pavement. However, there are other environmental factors that must be taken into consideration, such as

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Topics: Bridge and Highway, Rosphalt, Asphalt Additive Mix, Asphalt Mix Temperature

How A Properly Applied Tack Coat Can Extend The Life Of Your Project

Posted by Brock Peterson on Mar 23, 2018 11:10:00 AM

Tack Coat: The Bond That Promotes Optimal Performance

 A vital but often overlooked part of an asphalt pavement is the bond strength between the layers that make up the finished structure. Tack coat is the main component responsible for ensuring a sufficiently strong bond.

 What is a tack coat?

  • It is an asphalt binder that is spray applied onto a substrate material -- typically cement, asphalt or steel (in the case of orthotropic bridges) -- prior to placing a new asphalt overlay.
  • This thin application of bitumen is the glue that binds the two layers of pavement resulting in a uniform structure.
  • This bonding of the layers creates a structure that behaves as a single unit as opposed to unbound, independent layers.
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Topics: Bridge and Highway, Rosphalt, Tack Coat

Using Thermoplastic Polymers In Asphalt Mix For Bridge Decks

Posted by David Fricke on Nov 15, 2017 11:13:45 AM

Asphalt has been used on bridge decks for over 100 years with the intent of providing an effective road surface area for traffic and limited water-proofing properties. Historically, standard materials have functioned well without the need for modification but as traffic volumes and loads have increased, demand has necessitated a shift to high- performance surfacing materials.

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Topics: Bridge and Highway, Thermoplastic, Rosphalt

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