TY - JOUR
T1 - Phase evolution of slag-rich cementitious grouts for immobilisation of nuclear wastes
AU - Prentice, Dale P.
AU - Bernal, Susan A.
AU - Bankhead, Mark
AU - Hayes, Martin
AU - Provis, John L.
PY - 2018/9/30
Y1 - 2018/9/30
N2 -
An updated calcium silicate hydrate (C–S–H) model incorporating aluminium-containing end-members was used for thermodynamic modelling of blended cements using blast-furnace slag and Portland cement (BFS:PC) with ratios of 1:1, 3:1 and 9:1, using GEMSelektor. Selective dissolution and magic angle spinning nuclear magnetic resonance (MAS NMR) studies were performed to determine the degree of hydration (DoH) of the anhydrous material as an input parameter for the modelling work. Both techniques showed similar results for determining the DoH of the BFS within each sample. Characterisation of the hardened cement pastes over 360 days, using X-ray diffraction analysis and MAS NMR, demonstrated that the use of the updated C–S–H model can highlight the effect of different blend ratios and curing ages on the phase assemblages in these cements. Validation using this modelling approach was performed on 20 year old specimens from the literature to highlight its applicability for modelling later-age blended cements.
AB -
An updated calcium silicate hydrate (C–S–H) model incorporating aluminium-containing end-members was used for thermodynamic modelling of blended cements using blast-furnace slag and Portland cement (BFS:PC) with ratios of 1:1, 3:1 and 9:1, using GEMSelektor. Selective dissolution and magic angle spinning nuclear magnetic resonance (MAS NMR) studies were performed to determine the degree of hydration (DoH) of the anhydrous material as an input parameter for the modelling work. Both techniques showed similar results for determining the DoH of the BFS within each sample. Characterisation of the hardened cement pastes over 360 days, using X-ray diffraction analysis and MAS NMR, demonstrated that the use of the updated C–S–H model can highlight the effect of different blend ratios and curing ages on the phase assemblages in these cements. Validation using this modelling approach was performed on 20 year old specimens from the literature to highlight its applicability for modelling later-age blended cements.
UR - https://doi.org/10.1680/jadcr.17.00198
UR - https://www.scopus.com/pages/publications/85051509049
U2 - 10.1680/jadcr.17.00198
DO - 10.1680/jadcr.17.00198
M3 - Article
SN - 0951-7197
VL - 30
SP - 345
EP - 360
JO - Advances in Cement Research
JF - Advances in Cement Research
IS - 8
ER -