CLOSE OVERLAY

Enhancing the Fundamental Knowledge and Use of Asphalt Emulsions Using Systematic Scientific and Engineering Approaches

Project Details
STATUS

Completed

START DATE

03/01/17

END DATE

09/28/18

FOCUS AREAS

Infrastructure

RESEARCH CENTERS InTrans, AMPP, MTC
SPONSORS

Iowa Department of Transportation
Iowa Highway Research Board
Midwest Transportation Center
USDOT/OST-R

Researchers
Principal Investigator
Ashley Buss

Assistant Professor, Civil, Construction and Environmental Engineering

About the research

Due to their lower application temperature, lower energy consumption, and lower viscosity, asphalt emulsions are gaining popularity in the United States and worldwide. About 3 million tons of asphalt emulsion are produced in the US, which accounts for 5% to 10% of the total asphalt consumption. However, there is still a lack of understanding of the mechanisms by which asphalt emulsions are produced and how they work.

This research project reviews current literature available on asphalt emulsions to determine the present state of the practice, documents the development of an asphalt laboratory at Iowa State University, reports asphalt emulsion results, and creates an action plan for future work.

Two standard emulsions, one non-modified and one polymer-modified, were produced in the laboratory using a state-of-the-art laboratory-scale asphalt emulsion mill, emulsion properties were compared and experience was gained. To determine standards by which to compare emulsions to the performance grade (PG) system of binder classification, master curves of elastic modulus (G*) were plotted between emulsion residue and their base binders. The elastic recovery of polymer-modified asphalt emulsion residue was also tested to compare its performance with polymer-modified binders. Finally, sweep tests were conducted on laboratory-prepared chip seal samples to compare the aggregate mass lost between samples prepared with asphalt emulsion and hot applied asphalt.


Funding Sources:
Iowa Department of Transportation
Iowa Highway Research Board ($45,000.00)
Midwest Transportation Center
USDOT/OST-R
Total: $45,000.00

Contract Number: DTRT13-G-UTC37

TOP