Objective

1. Department of Civil Engineering & Mechanics Characterization of Coal Combustion Products for use in Asphalt & other Industries Justin Flickinger, Emil G. Bautista, Mark Moyle Advisor: Dr. Konstantin Sobolev Co-Advisors: Dr. Ahmed Faheem, Dr. Rajan Saha, Dr. Ismael Flores F Objective Developing characterization techniques that can be specific to asphalt and yet general enough to be employed by other industries needs will help to capture this unique product before it goes into our landfills and utilize it in a multitude of consumable uses. Approach • Two different types of ash (type F and C, pictured to the right) where found in accordance with ASTM C618 (standard for using coal fly ash in concrete). • In addition a third type of ash was determined to be spray dryer ash, a common ash found in sulfur scrubbing of the flue gas (from coal power production). • All ashes demonstrated definitive classification characteristics and all have applicability in a multitude of industries. • Modifying characterization techniques to allow more application of CCP’s will help to fully utilize this valuable resource. C

2. Methodology Results • Materials • 6 Type F fly ash (ASTM C618) • 3 Type C fly ash (ASTM C618) • 4 SDA CCP’s (currently no standard) • 2 Off the standard fly ash (one close to type F and one close to type C) • 2 Reference mineral fillers for asphalt (ASTM D546) • Chemical Analysis • X-ray fluorescence for chemical oxides. • Energy dispersive spectroscopy (EDS) for elemental analysis. • Loss on ignition (LOI) for carbon content. • Mineralogy • X-ray diffraction was performed for mineralogical properties. • Analysis of the diffraction patterns using full profile refinement by derivative difference minimization. • Both amorphous and crystalline phases were identified and quantified. • Physical Properties • Specific gravity (SG) was measured with a helium pycnometer. • Particle size distributions were tested in accordance with ASTM D4464. From this data surface area, fineness modulus, D10, D50, and D90 were obtained. • Fractional voids were tested using a Rigden Void Apparatus. • Scanning electron microscope produced images to show the shape of the different particles. Mineralogy From top down-Type F, Type C, SDA,

3. Chemical Composition Particle Size Distribution Results (continued) Rigden Voids Conclusions Despite the large difference in properties of the CCP’s an experimental plan was carried out to address CCP’s usage in asphalt and other building materials such as (but not limited to) concrete and gypsum. The information provided accomplishes this goal by producing all the necessary ground work for the CCP’s to be classified and utilized in the most advantageous way for different industries. Rigden Voids analysis is typically a test associated with mineral fillers used in asphalt. By providing this information these CCP’s can now be utilized as a cheaper and “greener” substitution for mineral fillers. Future analysis of CCP’s can use this characterization in order to provide a more comprehensive analysis increasing the product marketability to an increased number of industries.