反应性胶体凝胶中的蠕变：水泥水化物的纳米力学研究
Creep in reactive colloidal gels: a nanomechanical study of cement hydrates
摘要：
从软的聚合物凝胶到硬化的水泥浆，非晶态固体在恒定载荷下表现出显著的时间依赖性变形，称为蠕变。这种现象的微观机制在无定形材料中知之甚少，在密集堆积和化学反应性颗粒系统中构成了更大的挑战。这两个特点是突出存在于水合水泥浆组成的硅酸钙水合物（C-S-H）纳米粒子，其堆积密度增加作为时间的函数，而水泥水化发生。在水化的各个阶段进行纳米压痕测试和孔隙率测量的大量样品的收集，我们表明，水化水泥浆体的蠕变响应主要是由颗粒间的距离和结果（C-S-H）纳米颗粒之间的滑移控制。我们的研究结果提供了一个独特的洞察的微观机制，支撑在老化颗粒材料的蠕变响应，从而为混凝土的设计与改善抗蠕变性铺平了道路。
英文摘要：
From soft polymeric gels to hardened cement paste, amorphous solids under constant load exhibit a pronounced time-dependent deformation called creep. The microscopic mechanism of such a phenomenon is poorly understood in amorphous materials and constitutes an even greater challenge in densely packed and chemically reactive granular systems. Both features are prominently present in hydrating cement pastes composed of calcium silicate hydrate (C-S-H) nanoparticles, whose packing density increases as a function of time, while cement hydration is taking place. Performing nano-indentation tests and porosity measurements on a large collection of samples at various stages of hydration, we show that the creep response of hydrating cement paste is mainly controlled by the inter-particle distance and results from slippage between (C-S-H) nanoparticles. Our findings provide a unique insight into the microscopic mechanism underpinning the creep response in aging granular materials, thus paving the way for the design of concrete with improved creep resistance.
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