Effect of sulfate additions on hydration and performance of ternary slag-limestone composite cements

Abstract

This is a repository copy of Effect of sulfate additions on hydration and performance of ternary slag-limestone composite cements.

Expansion of CEM I and slag-blended cement mortars exposed to combined chloride-sulphate environments

“…The weighted degrees of hydration were always slightly greater following immersion in the combined chloride-sulphate solution. This reflects the common knowledge that chlorides accelerate hydration of the silicate phases in clinker [45,46] and also that sulphates can accelerate slag hydration [37,47]. This resulted in more hydration products, thereby reducing coarse porosity as shown in Table 6.…”

The Hydration, Mechanical, Autogenous Shrinkage, Durability, and Sustainability Properties of Cement–Limestone–Slag Ternary Composites

“…However, the compressive strength of PC5LF10S was significantly higher than that of the control (PC0LF0S). This can be attributed to the nucleation effect of LF, which effectively promotes the hydration reaction and increases the early compressive strength [9,11], and it can also be attributed to the Hc generated in the early stage, which increases strength [26]. Hc production can be observed in the early stage, as shown in in Section 3.6.…”

“…Finally, the synergistic effect of LF and BFS produces hemicarboaluminate (Hc) and monocarboaluminate (Mc) [25]. Adu-Amankwah et al [26] clarified that calcite reacts with aluminum phase to produce Hc and Mc, which stabilizes ettringite, reduces porosity, and contributes to both early and late compressive strength. The variation of all mixtures compressive strength is shown in Figure 2.…”

Effects of sulfates on the hydration of Portland cement – A review

“…Otherwise, the C 3 S hydration is hindered, reducing the mechanical performance at early ages [10][11][12][13]. On the other hand, if too much calcium sulfate is added, the mechanical performance suffers [61,78,157]. Furthermore, increasing the sulfate content may lead to durability problems due to delayed ettringite formation (DEF), especially in cements submitted to high curing temperatures [14][15][16].…”