Marshall Mix Design : A Hot Mix Asphalt

1084 WordsDec 10, 20145 Pages
Benjamin Mitsmenn CEN 584 9/16/2014 HW 1 Question #1) Marshall Mix Design: The Marshall Mix Design is a hot mix asphalt or HMA, design method used primarily for flexible pavements. The origins of this method date back to 1939 when its creator, Bruce Marshall, was working for the Mississippi Highway Department. This method has been altered and improved upon over the years by the United States Army and is now a prevalent choice among roughly 38 states in the U.S. The Marshall method is comprised of 6 steps which are outlined as follows. Step 1 – Aggregate Selection: Similar to the process used in the HVEEM Design Method, the aggregate selection process consists of three steps. The first step is to determine the aggregate’s physical properties, the second is to determine other aggregate descriptive physical properties and the third is to perform blending calculations to achieve the mix design aggregate gradation. Step 2 – Asphalt Binder Evaluation: Although not an exact procedure this procedures purpose is to select an asphalt binder that will be appropriate dependent upon location. Due to the major differences in temperature and weather patterns throughout the U.S. there is no set standard for this portion of the design. However, the most commonly used procedure is the Superpave PG binder system. Step 3 – Sample Preparation: This consists of typically 15 samples being created and tested, each with different asphalt binder content. The samples are tested using the Marshall

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