Abstract:
Self-consolidating cement based composite is a most recent
cementitious system that compacts on its own in narrow places. The
constituents of the composite are analogous to the standard systems
except for the admixtures that enhance its flowability, durability and fresh/
hardened state properties.
This research delineates and experimentally investigates into the
behavior and properties of self-consolidating cement based composites
reinforced by functionalized and surfactant coated hexagonal Boron
Nitride nanoparticles (hBNNPs). Several approaches have been considered
to appropriately disperse and achieve effective bonding of hBN
nanoparticles with hydration products of cement in self-consolidating
cement based systems. The dispersion has successfully been done by
covalent as well as non-covalent surface modification that enhanced the
interfacial interactions of hBNNPs with cementitious matrice.
Characterization of functionalized hBN and reinforced cement
nanocomposites was performed by Scanning Electron Microscopy (SEM)
and Fourier Transform Infrared Spectroscopy (FTIR). Effects of hBNNPs on
process of hydration within fresh cement mix have also been evaluated by
semi adiabatic calorimetry as well as by volume stability stand point.
Experimental outcome along with theoretical analysis confirm significant
increase and improvement of essential engineering properties along with
stable reaction kinetics of cement based nanocomposite containing
optimum dose of hBNNPs.
