DATE:

Friday, January 31, 2020

TIME:

3:00 PM

LOCATION:

GMCS-314

SPEAKER:

Dr. Marta Miletić, Assistant Professor, Department of Civil, Construction, and Environmental Engineering, SDSU

ABSTRACT:

A low ratio between the compressive strength of concrete and its cost makes concrete one of the most widely used construction materials in civil engineering. Despite of an excellent response to compressive stress, concrete exhibits a low tensile strength and limited tensile strain capacity. Adding short discrete fibers to a cementitious matrix can significantly improve its performance under tensile stress, thus ultimately exhibiting a ductile behavior. Nevertheless, in spite of their beneficial properties fiber reinforced cementitious composites remain underutilized in engineering practice. One of the main reasons for this is a lack of adequate characterization of the fiber distribution within the matrix, as well as a lack of analysis methods that would allow engineers to incorporate fiber-reinforced structural concrete elements into their design. Therefore, this research has three key objectives: 1) to computationally model a stress-strain response of high-performance fiber-reinforced cementitious composites in uniaxial tension and uniaxial compression prior to macro-crack localization, 2) to develop and perform a diagnostic strain localization analysis for high-performance fiber-reinforced cementitious composites, the results of which can characterize effects of fibers on failure precursors, and 3) to quantify the effects of aspect ratio, time/duration of pouring, and the effect of rebar placement on the fiber orientation using dynamic X-ray radiography.

HOST:

Satchi Venkataraman

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