Calcium Hydroxide Saturation Factors in the Pore Solution of Hydrated Portland Cement Fly Ash Pastes

Effect of silica fume fineness on the improvement of Portland cement strength performance

“…An alternative explanation is that the SCMs become less reactive as the pH of the pore solution drops and as the concentration of calcium hydroxide and alkalis decline [22]. Given that calcium hydroxide is consumed excessively by the pozzolanic reaction, a phenomenon called self-neutralisation occurs lowering the alkalinity of the hardened cement could have been detrimental [30].…”

Influence of triethanolamine on the hydration product of portlandite in cement paste and the mechanism

“…Generally, the composition in pore solution is determined by the dissolution of the clinker phases as well as the sulfate carriers in the cement and the precipitation of the hydration products, such as ettringite, portlandite and [13][14][15][16][17][18][19][20][21][22][23][24]. During the first hours of hydration, the pore solution is dominated by high concentration ions including sodium, potassium, calcium, sulfate and hydroxide in an order of tens to hundreds millimole per liter, together with some low concentration elements such as Al, Fe and Si in an order of several tens micromole per liter.…”

The pore solution of blended cements: a review

“…Some authors state that higher pH-values give rise to higher sulfate concentrations [20,21,23,30,54,[80][81][82]. Figure 10 shows the sulfate concentrations as a function of the OH -concentration.…”