水泥粘结力的物理学
The physics of cement cohesion
摘要：
水泥是世界上生产量最大的材料之一。作为温室气体排放的主要参与者，它是混凝土中的主要粘合剂，它提供了在凝固过程中迅速增加的内聚强度。了解这种凝聚力是如何产生的一直是水泥科学和技术进步的主要障碍。在这里，我们结合计算统计力学和理论，以证明如何水泥凝聚力的结果从互锁的离子和水的组织，逐步限制在纳米狭缝之间的带电表面的硅酸钙水合物。由于水/离子互锁，介电屏蔽大大减少，离子相关性被证明比以前认为的要强得多，这决定了水泥水化过程中纳米级相互作用的演变。通过发展基于库仑力的水泥内聚力的定量分析预测，我们调和了对水泥水化的新的基本理解与固体水泥浆体的完全原子化描述，并为建筑材料的科学和技术开辟了新的途径。
英文摘要：
Cement is one of the most produced materials in the world. A major player in greenhouse gas emissions, it is the main binding agent in concrete, to which it provides a cohesive strength that rapidly increases during setting. Understanding how such cohesion emerges has been a major obstacle to advances in cement science and technology. Here, we combine computational statistical mechanics and theory to demonstrate how cement cohesion results from the organization of interlocked ions and water, progressively confined in nano-slits between charged surfaces of Calcium-Silicate-Hydrates. Due to the water/ions interlocking, dielectric screening is drastically reduced and ionic correlations are proven significantly stronger than previously thought, dictating the evolution of the nano-scale interactions during cement hydration. By developing a quantitative analytical prediction of cement cohesion based on Coulombic forces, we reconcile a novel fundamental understanding of cement hydration with the fully atomistic description of the solid cement paste and open new paths for science and technologies of construction materials.
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