21st century construction practice involves the use of complex, composite materials that must meet engineering criteria throughout a broad range of time scales: from the time of construction to the end of the structure’s service lifetime.  These materials typically use a combination of polymeric and inorganic components to achieve the desired material properties.  During construction, polymers can be added to cementitious materials to achieve the desired viscoelastic properties (modulus, hardness, and relaxation behavior) during conventional or additive construction practices.  Over the long-term, additives can contribute to the mechanical durability of construction materials exposed to harsh environments.  This research project focuses on advanced characterization techniques (such as dynamic mechanical analysis, nano-/micro-indentation) for measuring the rheology and viscoelasticity of composites throughout the construction process and correlates to the durability and service life of the composites.   The goal is to understand the interplay between structure-properties-performance within these systems. These measurements would contribute to standardized test methods and, where needed, reference materials for the construction community.

 

key words

Rheology; dynamic mechanical analysis; viscoelasticity; construction materials; Mechanical properties; Nanoindentation; Polymers; Cementitious Materials

Citizenship:  Open to U.S. citizens

Level:  Open to Postdoctoral applicants