2018年4月1日 · TEM imaging revealed that in the absence of PCEs following a non-classical nucleation mechanism C-S-H initially precipitates as metastable, globular nanoparticles (droplets, d ~ 20–60 nm) which within less than one hour convert …

2023年8月15日 · TEM observation and schematic representation of the development of C-S-H morphology over time. The first row illustrates the gradual evolution of featureless C-S-H on the surface of cement particles into a typical foil-like morphology, which involves several intermediate steps.

Transformation of C-S-H is crucial in the deterioration of concrete at high temperatures. This study investigates the composition, structure, and morphology of C-S-H from 30 °C to 1000 °C using in-situ heating XRD, TGA/TG-IR, in-situ heating XPS, and in …

Calcium silicate hydrate (C-S-H) is the binder in concrete, the most used synthetic material in the world. The main weakness of concrete is the lack of elasticity...

本文使用透射电子显微镜 (TEM) 系统地研究了白色波特兰水泥 (WPC) 浆体中 CSH 形态的发展。 早在混合后 60 秒，就可以在 WPC 颗粒表面观察到 CSH 凝胶。 在悬浮液中发现了四种典型的 CSH 形态，即无特征、纤维状、叶片状和箔状。 我们证明了CSH在沉淀过程中具有多步形态变化和显着的形态多样性。 还研究了 pH 值和钙浓度对 CSH 的组装过程和最终形态状态的影响。 已经报道了许多类型的硅酸钙水合物 (CSH) 凝胶形态。 虽然 CSH 固化和形态发展的机制在很大 …

2012年12月24日 · 本文使用 tem 方法研究水泥早期(24 h 内)水化产物. 选取了 水泥早期水化过程中的几个特定时间点, 使用 tem, 同时结合 sem 和 xrd 及 edx 分析,

C-S-H seeding in Portland cements is well known from basic scientific works and field applications. Moreover, this activation approach could be beneficial for low-CO2 cements under development...

2018年4月1日 · TEM imaging revealed that in the absence of PCEs following a non-classical nucleation mechanism C-S-H initially precipitates as metastable, globular nanoparticles (droplets, d ~ 20–60 nm) which...

2021年8月11日 · Optimising the mesoscale structure of calcium-silicate-hydrate (C-S-H) is critical to achieving durable and sustainable infrastructure using Portland cement concrete. However, control of its...

2018年4月1日 · In our study, we investigated the very early nucleation of C-S-H (0–5 h) precipitated from Ca(NO 3) 2 and Na 2 SiO 3 solutions at a Ca/Si ratio of 1.0 in the presence of different PCE superplasticizers by capturing the very first precursors via transmission electron microscopy (TEM).