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Two-Step Nucleation Process of Calcium Silicate Hydrate, the Nanobrick of Cement
Chemistry of Materials ( IF 7.2 ) Pub Date : 2018-04-17 00:00:00 , DOI: 10.1021/acs.chemmater.7b04245 Nina Krautwurst 1 , Luc Nicoleau 2 , Michael Dietzsch 2 , Ingo Lieberwirth 3 , Christophe Labbez 4 , Alejandro Fernandez-Martinez 5 , Alexander E. S. Van Driessche 5 , Bastian Barton 1 , Sebastian Leukel 1 , Wolfgang Tremel 1
Chemistry of Materials ( IF 7.2 ) Pub Date : 2018-04-17 00:00:00 , DOI: 10.1021/acs.chemmater.7b04245 Nina Krautwurst 1 , Luc Nicoleau 2 , Michael Dietzsch 2 , Ingo Lieberwirth 3 , Christophe Labbez 4 , Alejandro Fernandez-Martinez 5 , Alexander E. S. Van Driessche 5 , Bastian Barton 1 , Sebastian Leukel 1 , Wolfgang Tremel 1
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Despite a millennial history and the ubiquitous presence of cement in everyday life, the molecular processes underlying its hydration behavior, like the formation of calcium–silicate–hydrate (C–S–H), the binding phase of concrete, are mostly unexplored. Using time-resolved potentiometry and turbidimetry combined with dynamic light scattering, small-angle X-ray scattering, and cryo-TEM, we demonstrate C–S–H formation to proceed via a complex two-step pathway. In the first step, amorphous and dispersed spheroids are formed, whose composition is depleted in calcium compared to C–S–H and charge compensated with sodium. In the second step, these amorphous spheroids crystallize to tobermorite-type C–S–H. The crystallization is accompanied by a sodium/calcium cation exchange and aggregation. Understanding the formation of C–S–H via amorphous liquid precursors may allow for a better understanding of the topography of the nucleation in cement paste and thus the percolation of hydration products leading to the mechanical setting as well as the retarding effect of known chemical species like aluminum ions and polycarboxylate ethers.
中文翻译：
水泥纳米砖硅酸钙水合物的两步成核过程
尽管有千年的历史并在日常生活中普遍存在水泥，但其水化行为的分子过程（例如，硅酸钙水合物（C–S–H）的形成，混凝土的粘结相）仍未得到开发。使用时间分辨电位和浊度法结合动态光散射，小角度X射线散射和冷冻透射电镜，我们证明了C–S–H的形成是通过复杂的两步途径进行的。第一步，形成无定形和分散的球体，与C–S–H相比，其组成中的钙缺乏，并用钠补偿电荷。在第二步中，这些无定形球体结晶成钙铁矿型C–S–H。结晶伴随有钠/钙阳离子交换和聚集。
更新日期：2018-04-17
中文翻译：
水泥纳米砖硅酸钙水合物的两步成核过程
尽管有千年的历史并在日常生活中普遍存在水泥，但其水化行为的分子过程（例如，硅酸钙水合物（C–S–H）的形成，混凝土的粘结相）仍未得到开发。使用时间分辨电位和浊度法结合动态光散射，小角度X射线散射和冷冻透射电镜，我们证明了C–S–H的形成是通过复杂的两步途径进行的。第一步，形成无定形和分散的球体，与C–S–H相比，其组成中的钙缺乏，并用钠补偿电荷。在第二步中，这些无定形球体结晶成钙铁矿型C–S–H。结晶伴随有钠/钙阳离子交换和聚集。
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