Abstract
The dispersion quality of nanosilica (NS) is an essential parameter to influence and control the material characteristics of nanosilica-enhanced concrete. In this research, the dispersion quality of colloidal nanosilica in simulated concrete environments was investigated using dynamic light scattering. A concrete environment was simulated by creating a synthetic pore solution that mimicked the ionic concentration and pH value of ultrahigh-performance concrete in the fluid state. Four colloidal nanosilica samples were used, ranging in particle sizes from 5 to 75 nm, with differing solid contents and stabilizing ions. It was found that the sodium stabilized 20 nm NS sol remains dispersed at a solid concentration of 2 wt % through a variety of pH values with the inclusion of potassium ions. Calcium ions are a major contributor to the agglomeration of NS sols and only small concentrations of calcium ions can drastically affect the dispersion quality.
Highlights
The development of concrete research has accelerated in the areas of mechanical and durability properties due to potential benefits of using nanoparticles in concrete mixture design, including nanosilica (NS), nanosized TiO2, carbon nanotubes, and graphene oxide [1,2,3,4,5,6]
Two measurements from dynamic light scattering (DLS) are primarily used in this research: Size (z-average) and polydispersity index (PDI)
ZPmeasurements measurements were taken from same sample ascorresponding the corresponding between 11 VVand were taken from thethe same sample as the
Summary
The development of concrete research has accelerated in the areas of mechanical and durability properties due to potential benefits of using nanoparticles in concrete mixture design, including nanosilica (NS), nanosized TiO2 , carbon nanotubes, and graphene oxide [1,2,3,4,5,6]. Colloidal NS, as opposed to a dry powder, provides NS particles in a wellstability by possessing a net negative charge on the surface, strong enough to repulse the van der dispersed state, free of significant agglomeration. Besides enhanced packing density, improved exhibit specific functionality by inheriting properties of the added nanoparticles, such as air depolluting, pore structure, and enhanced mechanical and durability properties, these new composites can elasticity control, and acceleration of hydration kinetics [35,36,37,38]. NS sols were diluted, pH was altered, and added to a synthetic pore solution to further understand NS destabilization
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
