Investigations were focused on the development of a technology for phosphorus (P) recovery straight from wastewater. Facing the finiteness of the natural resources of this essential nutrient, the declared goal must be the sustainable use of available phosphorus sinks such as wastewater treatment plants (WWTP) for the generation of P rock substitutes. A feasible method for simultaneous eliminati...

This paper presents the microscopic characterization of two types of fly ash belite cements and their hydration products by means of scanning electron microscopy (SEM), energy-dispersive X-ray (EDX) microanalysis and X-ray diffraction analysis. The cements were obtained from ASTM class C coal fly ash by the hydrothermal-calcination route in water (FABC-2-W) and NaOH 1M solution (FABC-2-N). The ...

A poorly crystalline class of calcium silicate hydrates known as C–S–H possesses extensive disorder and structural variations at the nanometer scale. The extent of these variations has generally obscured a comprehensive understanding of the C–S–H nanostructure, but new relationships between solubility and structure appear to shed new light on this old problem. These relationships were inspired ...

carbon nanotubes (MWCNTs) in the range of 0.00004–0.000006 wt. % mass cement on structure and mechanical properties concrete was demonstrated. A correlation found between an increase strength by 56 with changes stone, at which proportion crystals calcium hydroaluminate, hydrosulfoaluminate type 14A tobermorite increases significantly. The results obtained lay foundations for development a techn...

Despite decades of studies of calcium-silicate-hydrate (C-S-H), the structurally complex binder phase of concrete, the interplay between chemical composition and density remains essentially unexplored. Together these characteristics of C-S-H define and modulate the physical and mechanical properties of this "liquid stone" gel phase. With the recent determination of the calcium/silicon (C/S = 1....