TY - JOUR
T1 - The effect of Ordinary Portland Cement on nuclear waste glass dissolution
AU - Ferrand, Karine
AU - Liu, Sanheng
AU - Lemmens, Karel
N1 - Score = 10
PY - 2014/12
Y1 - 2014/12
N2 - To evaluate the durability of the glass matrix and to identify the key mechanisms responsible for glass alteration in the cementitious environment imposed by the Supercontainer design, glass leach tests were conducted at 30°C under Ar atmosphere in suspensions of Ordinary Portland Cement and synthetic young cement water with the high pH of 13.5. The cement appears to trigger the glass dissolution by consumption of glass matrix components leading to a fast glass dissolution at a constant rate with the formation of a porous gel layer on the glass. The key mechanism driving the long-term glass dissolution is secondary phase formation with Si and Al from the glass matrix. The two main reactions are the reaction of Si released by the glass with portlandite, leading to the formation of Calcium Silicate Hydrate (C-S-H) phases, and the further conversion of C-S-H phases with Al from the glass to form Calcium Aluminum Silicate Hydroxide (C-A-S-H) phases. After consumption of the portlandite, the glass alteration rate is expected to decrease
AB - To evaluate the durability of the glass matrix and to identify the key mechanisms responsible for glass alteration in the cementitious environment imposed by the Supercontainer design, glass leach tests were conducted at 30°C under Ar atmosphere in suspensions of Ordinary Portland Cement and synthetic young cement water with the high pH of 13.5. The cement appears to trigger the glass dissolution by consumption of glass matrix components leading to a fast glass dissolution at a constant rate with the formation of a porous gel layer on the glass. The key mechanism driving the long-term glass dissolution is secondary phase formation with Si and Al from the glass matrix. The two main reactions are the reaction of Si released by the glass with portlandite, leading to the formation of Calcium Silicate Hydrate (C-S-H) phases, and the further conversion of C-S-H phases with Al from the glass to form Calcium Aluminum Silicate Hydroxide (C-A-S-H) phases. After consumption of the portlandite, the glass alteration rate is expected to decrease
KW - Supercontainer design
KW - Ordinary Portland Cement
KW - glass dissolution
KW - hyperalkaline pH
KW - pozzolanic reaction
UR - http://ecm.sckcen.be/OTCS/llisapi.dll/open/ezp_139493
UR - http://knowledgecentre.sckcen.be/so2/bibref/12612
U2 - 10.1016/j.mspro.2014.10.029
DO - 10.1016/j.mspro.2014.10.029
M3 - Article
VL - 7
SP - 223
EP - 229
JO - Procedia Materials Science
JF - Procedia Materials Science
T2 - 2nd International Summer School on Nuclear Glass Wasteform: Structure, Properties and Long-Term Behavior, SumGLASS 2013
Y2 - 23 September 2013 through 27 September 2013
ER -