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首页> 外文会议>International Congress on Applied Mineralogy in the Minerals Industry >SPECTROSCOPIC STUDIES OF THE INFLUENCE OF MULTI-WALLED CARBON NANOTUBES ON THE HYDRATION OF TRICALCIUM SILICATE AND MICROSTRUCTURE OF CALCIUM SILICATE HYDRATE PHASES
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SPECTROSCOPIC STUDIES OF THE INFLUENCE OF MULTI-WALLED CARBON NANOTUBES ON THE HYDRATION OF TRICALCIUM SILICATE AND MICROSTRUCTURE OF CALCIUM SILICATE HYDRATE PHASES

机译：多壁碳纳米管对硅酸钙硅酸钙水合的影响的光谱研究，硅酸钙水合物阶段的微观结构

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Carbon nanotubes (CNTs) were discovered by Ijima in 1991. They have remarkable properties such as surface area and flexural strength, which is twenty times higher than steel. Additives with these qualities are required in concrete, mortar, and other construction materials to improve the performance of the binder system. For future applications, the knowledge of interactions between hydrating tricalcium silicate (CjS) as a main component of cement and CNTs is very important. Therefore, a better understanding of the way of hydration and the nucleation in presence of CNTs is needed. An influence of multiwalled carbon nanotubes (MWCNTs) on the crystallinity of portlandite (calcium hydroxide) during C3S hydration has been shown in previous experiments as well as an influence on the mechanical properties. Flexural strength increases up to 45% with samples including MWCNTs and C-sS. This observation leads to the assumption that the carbon nanotubes are incorporated into the micro- and nanostructure of the hydrated clinker phase. There are AFM-images that show MWCNTs overgrown by hydration products. Previous research activities focused on the influence of CNTs on portlandite, which is one of the main reaction products in cement hydration. In this work, we investigated the influence of the CNTs on the calcium silicate hydrates (CSH) by spectroscopic methods. The CSH-phases are important for strength development in cementitious binder systems. Recent ~(29)Si MAS NMR experiments indicate an incorporation of MWCNTs into the CSH-phases by a change of the silica tetrahedra Q" distribution and line broadening as a result of a paramagnetic interaction of CNTs. This shows that the CNTs arc homogeneous embedded in the CSH-phases. IR measurements support these results. Measurements of the hydration kinetics by calorimetric methods proof acceleration. The ability of the CNTs to work as a nucleation site is as well a reason for this change in the hydration rate.
机译：碳纳米管（CNT）是由饭岛发现于1991年。他们有显着的特性，例如表面积和抗弯强度，比钢高二十次。用这些性质的添加剂，需要在混凝土，砂浆和其它结构材料，以提高粘合剂体系的性能。对于未来的应用，水化硅酸三钙（CJS）之间的相互作用的水泥和碳纳米管的主要成分的知识是非常重要的。因此，需要的水合作用的方法和在碳纳米管的存在核更好的理解。多壁碳纳米管（MWCNT）上氢氧（氢氧化钙）的C3S水合期间结晶性的影响已被证明在先前的实验以及对机械性能的影响。抗弯强度增加高达45％的样品，包括多壁碳纳米管和C-SS。这一观察结果导致假设碳纳米管被纳入水合熟料阶段的微观结构和纳米结构。有迹象表明，通过展示水化产物长满碳纳米管AFM图像。以前的研究活动集中于碳纳米管的氢氧上的影响，这是主要的反应产物在水泥水化之一。在这项工作中，我们调查的水化硅酸钙（CSH）由光谱方法碳纳米管的影响。该CSH-阶段是在水泥粘合剂体系强度发展具有重要意义。最近〜（29）的Si MAS NMR实验的二氧化硅四面体Q”分布和线展宽为CNT的顺磁性相互作用的结果的变化表明多壁碳纳米管成CSH-相的掺入。这表明，碳纳米管电弧均匀嵌入在CSH-阶段。IR测量的量热方法支持这些结果。水化动力学的测量证明加速度的碳纳米管工作的能力作为成核位点，以及在水化速度这种变化的一个原因。

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