Tuesday | July 28, 2015

Current Issue

Handle Binder Safely

We all know asphalt binder is a key component in our mixes. How we handle binder is not only critical for quality, but also for our safety. Many workers come into contact with this hot liquid on a daily basis such as employees at the refinery, tanker drivers, plant personnel, and quality control techs to [...]

Design Drainage from the Base Up

Proper drainage is important to ensure a high quality, long-lived pavement. Pavement engineers understand that moisture accumulation in any pavement structural layer can cause problems. In the subgrade and aggregate base layer, it can weaken materials by increasing pore pressure and reducing the materials’ resistance to shear. Additionally, some soils expand when moist, causing differential [...]

Maintain Equipment for Safety’s Sake

When the mechanic or equipment operator performs the walk-around for a piece of equipment at the beginning of his shift, he’s not only checking for routine maintenance purposes. The daily walk-around serves a safety purpose as well. Open belts and pulleys, chains, sprockets, and other points of operation must be guarded to prevent the operator [...]

Upgrade Your A, B, Cs

Producers in and around Coolidge, Ariz., know that Western Emulsions, Inc., in Pinal County began operation of a million asphalt storage and distribution terminal about five years ago. The company uses the facility to manage its supply of raw asphalt base stocks for its own emulsion products and has partnered with paving grade asphalt [...]

How to Avoid Emulsion Soup

With the success of multiple test sections incorporating tack for bonding purposes at the National Center for Asphalt Technology (NCAT) Test Track in Auburn, Ala., contractors are likely to see an uptick in the call for tack between pavement layers. From emulsion-based products you’ll want to spray during daylight hours for best chance of break [...]

A Tale of Two Additives

Let’s start with the obvious: not all additives do the same thing. Even when injected mid-stream to an asphalt pavement mix to create warm-mix asphalt (WMA), different additives do different things. They’re not necessarily bringing temperatures down. That’s not what they’re created to do; that’s not what they’re doing. Various additives used to create WMA [...]

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