Cement Interfaces: Current Understanding, Challenges, and Opportunities
Cement Interfaces: Current Understanding, Challenges, and Opportunities
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DOI：
10.1021/acs.langmuir.1c00617
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发表时间：
2021-05-17
期刊：
影响因子：
3.9
通讯作者：
Heinz, Hendrik
中科院分区：
文献类型：
--
作者：
Heinz, Ozge;Heinz, Hendrik
水泥和混凝土的需求迅速增长，并在水合反应过程中的颗粒界面、电解质和有机添加剂的作用等方面提出了许多未解决的化学问题。需要通过开发更绿色、更可持续的配方来减少占全球二氧化碳排放量 11% 的高碳足迹。水泥是一种由硅酸钙、铝酸盐和其他矿物相组成的多相材料，由天然和低成本工业来源生产，会经历复杂的水合反应。这一观点强调了当前的研究挑战和新化学见解的机遇，包括涉及矿物表面、电解质、聚合物和水合反应的有趣的胶体和界面科学问题。具体来说，我们讨论了（1）水泥相、辅助胶凝材料和其他成分的特征，（2）水化反应以及通过成像和核磁共振波谱表征，（3）包括不同尺度的水合硅酸钙的水合水泥相的结构，（4）从原子尺度到微观尺度动力学模型的定量模拟技术，以及（5）有机添加剂的功能。着眼于新的方向，我们解释了整合无机化学、酸碱化学、聚合物化学、反应机制和理论的知识来描述制造时的介观水泥性能和本体性能的好处。
Cement and concrete are rapidly growing in demand and pose many unresolved chemistry questions at particle interfaces, during hydration reactions, regarding the role of electrolytes and organic additives. Solutions through developing greener, more sustainable formulations are needed to reduce the high carbon footprint that amounts to 11% of global CO2 emissions. Cement is a multiphase material composed of calcium silicates, aluminates, and other mineral phases, produced from natural and low-cost industrial sources, which undergoes complex hydration reactions. This perspective highlights current research challenges and opportunities for new chemistry insight, including intriguing colloid and interface science problems that involve mineral surfaces, electrolytes, polymers, and hydration reactions. Specifically, we discuss (1) characteristics of cement phases, supplementary cementitious materials, and other constituents, (2) hydration reactions and the characterization by imaging and NMR spectroscopy, (3) the structure of hydrated cement phases including calcium-silicate-hydrates at different scales, (4) quantitative simulation techniques from the atomic scale to microscale kinetic models, and (5) the function of organic additives. Focusing on new directions, we explain the benefits of integrating knowledge from inorganic chemistry, acid-base chemistry, polymer chemistry, reaction mechanisms, and theory to describe mesoscale cement properties and bulk properties upon manufacturing.