Evaluation of Low Density Polyethylene (LDPE) and Styrene Butadiene Styrene (SBS) Modifiers
Client: L.G. Caltex Oil Corporation
Evaluated the effectiveness of LDPE and SBS modifiers, and recommended polymer concentrations that would produce acceptable pavement performance for the predominant environmental conditions in Korea. The study consisted of conducting and analyzing Superpave binder tests for a base asphalt cement and six modifier combinations.
NCHRP Project 9-7: Field Procedures and Equipment to Implement SHRP Asphalt Specifications
Client: Brent Rauhut Engineering, Inc.
Superpave level 2/3 mix designs were developed for approximately 10 field projects constructed during the 1994 and 1995 paving seasons. Extensive testing was conducted on quality control samples taken during construction to measure material proportions, volumetric properties and Superpave performance-based engineering properties.
Forensic Pavement Analysis
Client: Miami-Dade County Attorney
AAT performed a forensic investigation to determine the quantity of asphalt placed in various layers of a pavement, and the relative age of pavement layers.
FHWA Contract DTFH61-95-C-00100: Superpave Support and Performance Models Management
Client: University of Maryland
AAT is providing professional staff and laboratory testing to assist the prime contractor with evaluation of the existing performance models, selection of a simple performance test to compliment volumetric mixture design, and the development of improved asphalt characterization models.
Pavement and Mix Design Strategies For the Oslo Airport Gardermoen
Client: Oslo Hovedflyplass A/S
Evaluated paving material (bitumen, aggregate and modifier) selection and paving mix design strategies for an initial pavement structural cross section proposed for the Oslo Airport Gardermoen. Paving materials and Superpave performance-based level 3 paving mix designs were recommended for dense-graded and stone matrix paving mixes.
German Rolling Flask Test Study
Client: Western Research Institute
Modified the German Rolling Flask apparatus and procedure to simulate the Rolling Thin Film Oven short term aging of asphalt. The objective was to develop a simplified and efficient alternative to the RTFOT short term aging procedure. A draft standard method for the Modified German Rolling Flask procedure was also developed.