Garg Group warmly welcomes new members who started in Summer and Fall 2021. These are MS candidates: Jacob Doehring, Dhanush Sahasra, Andrew Witte; PhD candidates: Bayezid Baten, Chirayu Kothari, Hyeonseok Jee, Brandy Diggs-McGee; and Postdoc: Dr. Hamza Samouh. Additionally, MS candidate Vikram Kumar successfully completed his MS thesis in Summer 2021 and continues in the group as a new PhD candidate, starting Fall 2021.
Mulitple openings for graduate students (both at MS and PhD level) are available for Fall 2022. Please apply and join us!
Additionally, a postdoc position has also just opened in our group. Please apply before Feb 21, 2022. Job details and application info is in the file below:.
A new publication titled “The Chemical and Physical Origin of Incineration Ash Reactivity in Cementitious Systems” was published in Resources, Conservation and Recycling in October 2021.
Incorporating industrial byproducts and waste in concrete is the key to reducing landfill usage as well as lowering the environmental footprint of cement industry. An emerging industrial byproduct which can partly replace cement is the Municipal Solid Waste Incinerator Ash (MSWI ash: residue that is left after incineration of municipal solid waste in a Waste-to-Energy facility). These ashes are predominantly calcium-rich; however, they also contain additional elements whose speciation is not known. These elements can significantly alter the hydration characteristics of a cementitious system. Our initial foray into cementitious matrices including these ashes, reveals that these ashes can accelerate as well as retard cement hydration. Specifically, Pb, Br, S, Ca, and Cl appear to accelerate cement hydration, whereas Cu, Fe, Al, Ti, Si, K, Zn, and Sr appear to retard cement hydration. Changes in hydration characteristics can have a strong bearing on the physical characteristics of cementitious systems incorporating incineration ashes. Thus, to selectively screen ashes that synergistically enhance the physical characteristics, we introduce a novel “Incineration Ash Coefficient (IAC),” which shows a strong correlation with the compressive strength (R2=0.79) of cement-ash binary mixtures.
This is the first article from our group’s Ph.D. candidate Vikram Kumar. Congratulations Vikram!