To conserve freshwater resources, seawater may be used for concrete production. As sodium chloride (NaCl) is the most abundant mineral found in seawater, in this study, we focused on the effects of NaCl on the hydration of alite, which is the major clinker phase in Portland cement, and its hydration dominates the mechanical behaviour of cement pastes. NaCl solutions with varying concentrations were mixed with alite at a solution-to-binder ratio of 0.5. Then, a combination of experiments and mesoscale simulation was utilized to study the influence of NaCl on the micro-mechanical properties of alite pastes. The nanoindentation test showed the improving micro-mechanical properties of alite pastes with increasing NaCl concentration. The pore size distribution analysis agreed with mesoscale simulation on the reduced porosity, and the latter showed increased cohesion. The porosity and cohesion changes were initiated by the ionic effects of Na⁺ and Cl⁻ that modify the Debye length of C-S-H_particle and dielectric constant of the C-S-H_gel pore solution.

为节约淡水资源，海水可用于混凝土生产。由于氯化钠 (NaCl) 是海水中发现的最丰富的矿物质，因此在本研究中，我们重点研究了 NaCl 对波特兰水泥中主要熟料相 alite 水化的影响，其水化作用主导着水泥的力学行为。水泥浆。将不同浓度的 NaCl 溶液与 alite 以溶液与粘合剂的比例为 0.5 混合。然后，结合实验和中尺度模拟，研究了NaCl对alite浆料微观力学性能的影响。纳米压痕试验表明，随着 NaCl 浓度的增加，alite 糊剂的微观力学性能得到改善。孔径分布分析与降低孔隙率的中尺度模拟一致，后者显示出增强的凝聚力。孔隙率和内聚力的变化是由 Na 的离子效应引发的⁺和 Cl ^-改变了 CSH_{粒子的德拜长度和 CSH凝胶}孔溶液的介电常数。