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The characteristics of C-S-H gel in hardened Portland cement pastes and complex binder pastes with ground granulated blast furnace slag were investigated with nanoindentation. The composition of C-S-H gel was analysed with SEM-EDS. The obtained results showed that the volume fraction of LD C-S-H gradually reduced and the volume fraction of HD C-S-H increased with the prolongation of hydration age. Most of the C-S-H gel produced at later age was HD C-S-H. The volume fraction of HD C-S-H increased as the fraction of slag in complex binder pastes increased, suggesting that HD C-S-H was mainly in the hydration products of slag. The chemichal compositions of the two types of C-S-H gel were simlar, meaning that formation and transformation of the two types of C-S-H gel were not affected by their Ca/Si ratio.
The characteristics of CSH gel in hardened Portland cement pastes and complex binder pastes with ground granulated blast furnace slag were investigated with nanoindentation. The composition of CSH gel was analysed with SEM-EDS. The obtained results showed that volume fraction of LD CSH white and the volume fraction of HD CSH increased with the prolongation of hydration age. Most of the CSH gel produced at later age was HD CSH. The volume fraction of HD CSH increased as the fraction of slag in complex binder pastes increased, then that HD CSH was mainly in the hydration products of slag. The chemichal compositions of the two types of CSH gel were simlar, meaning that formation and transformation of the two types of CSH gel were not affected by their Ca / Si ratio.