RT Journal Article
T1 Belite cements: 												Modifications of calcium silicate hydrate (C-S-H) gel by alkaline hydrothermal activation
A1 Guerrero, Ana
A1 Goñi, Sara
A1 Dolado, Jorje S.
AB The C-S-H gel of two types of fly ash belite cements (FABC) are studied at a nanwscale (1 to 100 nm [39.4 to 3940 nin.]) by means of the specific surface area and pore-size distribution, which were measured by the sorption isotherms of nitrogen gas and the BET method. The two belite cements were fabricated by the hydrothermal-calcination route of Class C fly ash in NaOH 1M solution (FABC-2-N) and demineralized water (FABC-2-W). Two differentiated zones in the pore-size distribution of the C-S-H gel at ∼12 and ∼3 nm (∼473 and ∼118 nin.) with different influences in the mechanical strength were produced. The proportion of both zones depends on the age of hydration and type of belite cement. At early ages, the C-S-H gel of FABC-2-N develops both zones in a greater proportion than those of FABC-2-W. At later ages, the behavior is opposite: the C-S-H gel ofFABC-2-W develops high proportion of pores of 3 nm (118 nin.) of diameter. Important quantitative correlations were found among these nanostructure characteristics of the C-S-H gel and macrostructural engineering property. copyright
SN 0889-325X
YR 2009
FD 2009-03
LK https://hdl.handle.net/11556/4053
UL https://hdl.handle.net/11556/4053
LA eng
NO Guerrero , A , Goñi , S & Dolado , J S 2009 , ' Belite cements : Modifications of calcium silicate hydrate (C-S-H) gel by alkaline hydrothermal activation ' , ACI Materials Journal , vol. 106 , no. 2 , pp. 138-143 .
DS TECNALIA Publications
RD 26 jul 2024