Correction: Li et al. Influence of Nesquehonite on the Early-Stage Hydration of Portland Cement. Materials 2025, 18, 5271

Abstract

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In the original publication [1], there was a mistake in the citation of Figure 21. Reference [9] was incorrectly cited in Figure 21 and should be removed. In addition, “Mook, W.G. Environmental Isotopes in the Hydrological Cycle: Principles and Applications; IAEA: Vienna, Austria; UNESCO: Paris, France, 2000; pp. 143–165.” was not cited. The citation has now been inserted as reference [33] in Section 4, Discussion, Paragraph 2, and should read as follows:

When P.I cement is mixed with water, the clinker mineral C_3_S undergoes rapid hydration. The overall hydration process is complex, but the general reaction can be represented by Equation (3). The product 3CaO·2SiO_2_·3H_2_O is C-S-H gel, the composition of which changes during the hydration process and which exhibits poor crystallinity. As C_3_S hydrates, the concentrations of Ca^2+^ and OH^−^ in the cement paste increase rapidly until supersaturation is reached, leading to the precipitation of Ca(OH)2 crystals. At this point, the paste solution is saturated with Ca(OH)2, and the pH stabilizes at 12.67 after an initial value of 12.14, exhibiting the trend shown in Figure 8 for the plain P.I cement. According to the Bjerrum diagram for the CO_2_-H_2_O system (Figure 21) [33], when the pH exceeds 12, CO_3_^2−^ becomes the dominant carbonate species, and the HCO_3_^−^ concentration is nearly zero. Therefore, when NQ is incorporated into the P.I cement paste, it primarily dissolves according to Equation (2), producing Mg^2+^ and CO_3_^2−^ ions.

The caption of Figure 21 has been updated accordingly and should read as follows:

Figure 21. Bjerrum diagram of CO_2_-H_2_O system at 25 °C, adapted from [33].

The authors state that the scientific conclusions are unaffected. This correction was approved by the Academic Editor. The original publication has also been updated.