A novel tobermorite-based porous material has been synthesized from municipal incineration bottom ash
(MIBA), using a hydrothermal processing method under saturated steam pressure (1.0 MPa) at 453 K for
12 h. Without additional vesicants, NaOH solution that is incorporated into the starting material acts as both
a reaction solvent and a vesicant. As a reaction solvent, the NaOH solution first promoted tobermorite formation
to form a huge number of small pores during hydrothermal processing; then, as a vesicant, it was released as
vapor from the solidified specimens to form large pores after drying. The porous material possessed a pore
diameter distribution of 0.01−10 μm, a BET specific surface area of 60 000 m2/kg, and a bulk density of
500−700 kg/m3. Moreover, the leaching tests showed that the concentration of heavy metals dissolved from
the solidified specimen became very low after hydrothermal processing.
Solidification of blast furnace water-cooled slag (BFWS) has been carried out using a hydrothermal processing
method, in which the BFWS could be solidified in an autoclave under saturated steam pressure (1.56 MPa)
at 473 K for 12 h by the addition of quartz. Experimental results showed that the strength development of the
solidified specimen was significantly affected by the curing time and quartz particle size. With increasing
curing time, the amount of tobermorite increased, and the formed tobermorite, in turn, enhanced the tensile
strength. The particle size of the quartz added exerted a significant influence on the strength development,
and the optimal quartz content for the strength development appeared to depend on the quartz particle size.
The results also suggested utilization of finer quartz had the advantage of reducing the addition of quartz.
in Wiley InterScience (www.interscience.wiley.com).Hydrothermal synthesis of mesoporous materials from diatomaceous earth has been carried out under saturated steam pressure (0.2-1.56 MPa) at 393-473 K for up to 72 h by slaked lime introduction. During the hydrothermal synthesis process, calcium silicate hydrate (CSH) was among the first phase formed and invariably appeared before tobermorite. The CSH formation seemed to exert a positive effect on the strength development and pore size evolution initially; whilst the tobermorite formation appeared to further enhance the strength and narrow the pore size. With curing at 473 K for 18 h, both of the strength and pore size distribution tended to reach optimal at which the pore size distribution also ranges between mesoporous area (2-50 nm in diameter). The highest strength seemed to coincide with the finest pore size distribution of the synthesized porous material during hydrothermal processing in this study.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.