For safe disposal of the large volume concrete waste generated during decommissioning Fukushima Daiichi Nuclear Power Station (F1NPS), state Cs and Sr contamination in must ideally be estimated advance planning. are primarily adsorbed by calcium silicate hydrate (C–S–H) cementitious materials. However, amount adsorption varies greatly with Ca/Si mole ratio (C/S ratio) C–S–H presence or absence ...

This study provides insights on the formation of crystalline phases from Fe-rich slag-based porous inorganic polymers (porous IPs), cured under hydrothermal conditions. The IPs were synthesised using synthetic slags with different chemistries (from FeO-SiO 2 -CaO to -Al O 3 systems) as solid precursors, and a sodium silicate-based alkaline activator. Chemical expansion was used create structure...

When the hydration kinetics of properly sulfated Portland cements is monitored by heat flow calorimetry, initial dissolution peak and dormant period followed main – formation calcium-silicate-hydrates portlandite, so-called silicate peak. This superimposed a associated to further tricalcium aluminate surge in precipitation sulfoaluminates (the sulfate depletion peak) right after added for setti...

Creep of the cement matrix affects structural stability concrete. In Portland cements, creep is largely controlled by binding phase calcium-(aluminum-)silicate-hydrate, or C-(A-)S-H. This has a lamellar structure and under deviatoric stress aligns its c -axis with principal stress. However, limiting resistance to this reorientation unknown at nanocrystalline level. Small-angle X-ray scattering ...

In the present work, important subject of improvement strength and durability future generation smart nano-engineered cementitious composites is evoked through incorporation another kind nanomaterial like fullerene buckyballs (C60). This research dedicated to analysis - at nanoscale processus embedding C60 nanomaterials in calcium silicate hydrates (C–S–H). Using molecular dynamics simulations,...

The ultra-fast synthesis of calcium silicate hydrates was performed in supercritical water that acts as a solvent for mimicking the natural conditions at high pressure and temperature geological process. synthesised xonotlite tobermorite represent perfect Ca−OH-rich Si−OH-rich model nanocrystals investigating effect different chemical environments on dynamics confined water. These results could...