TY - JOUR
T1 - Role of Zn in aluminosilicate glasses used as supplementary cementitious materials
AU - Mingione, Serena
AU - Pedersen, Malene Thostrup
AU - Sørensen, Søren Strandskov
AU - Winnefeld, Frank
AU - Montagnaro, Fabio
AU - Yue, Yuanzheng
PY - 2023/8/15
Y1 - 2023/8/15
N2 - The cement industry relies on the use of supplementary cementitious materials (SCM) to lower the related CO2 emission. SCM are often amorphous materials containing minor elements, which is why it is important to study the impact of these materials on cement reactivity. Two calcium aluminosilicate glass series as model substances of SCM were synthesized and investigated. In both series Ca was partially replaced by Zn, Sr and Mg in different ratios. Moreover, four cement blends made with CEM I 52.5 R and aqueous solutions of Mg(NO3)2·6H2O, Zn(NO3)2·6H2O and Sr(NO3)2 were investigated. Zn retards the reactivity of both glasses and cements system. This retardation effect is suggested to be related both to the formation of the calcium hydroxozincate hydrate, which affects the portlandite formation and, thus, the pH of the system, and to the formation of surface complexes which retards the dissolution and so the reactivity of the glasses.
AB - The cement industry relies on the use of supplementary cementitious materials (SCM) to lower the related CO2 emission. SCM are often amorphous materials containing minor elements, which is why it is important to study the impact of these materials on cement reactivity. Two calcium aluminosilicate glass series as model substances of SCM were synthesized and investigated. In both series Ca was partially replaced by Zn, Sr and Mg in different ratios. Moreover, four cement blends made with CEM I 52.5 R and aqueous solutions of Mg(NO3)2·6H2O, Zn(NO3)2·6H2O and Sr(NO3)2 were investigated. Zn retards the reactivity of both glasses and cements system. This retardation effect is suggested to be related both to the formation of the calcium hydroxozincate hydrate, which affects the portlandite formation and, thus, the pH of the system, and to the formation of surface complexes which retards the dissolution and so the reactivity of the glasses.
KW - Blast furnace slag
KW - Glass
KW - Reactivity
KW - Supplementary cementitious materials
KW - Zinc
UR - http://www.scopus.com/inward/record.url?scp=85160544574&partnerID=8YFLogxK
U2 - Open Access article
DO - Open Access article
M3 - Journal article
SN - 0022-3093
VL - 614
JO - Journal of Non-Crystalline Solids
JF - Journal of Non-Crystalline Solids
M1 - 122397
ER -