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首页> 美国卫生研究院文献>Materials >Elastic Modulus of the Alkali-Silica Reaction Rim in a Simplified Calcium-Alkali-Silicate System Determined by Nano-Indentation
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Elastic Modulus of the Alkali-Silica Reaction Rim in a Simplified Calcium-Alkali-Silicate System Determined by Nano-Indentation

机译：纳米压痕法确定的简化钙-碱-硅酸盐体系中碱-硅反应环的弹性模量

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摘要

This work aims at providing a better understanding of the mechanical properties of the reaction rim in the alkali-silica reaction. The elastic modulus of the calcium alkali silicate constituting the reaction rim, which is formed at the interface between alkali silicate and Ca(OH)2 in a chemically-idealized system of the alkali-silica reaction, was studied using nano-indentation. In addition, the corresponding calcium to silica mole ratio of the calcium alkali silicate was investigated. The results show that the elastic modulus of the calcium alkali silicate formed at the interface increased with the increase of the calcium to silica mole ratio and vice versa. Furthermore, the more calcium that was available for interaction with alkali silicate to form calcium alkali silicate, the higher the calcium to silica mole ratio and, consequently, the higher the elastic modulus of the formed calcium alkali silicate. This work provides illustrative evidence from a mechanical point of view on how the occurrence of cracks due to the alkali-silica reaction (ASR) is linked to the formation of the reaction rim. It has to be highlighted, however, that the simplified calcium-alkali-silicate system in this study is far from the real condition in concrete.
机译：这项工作旨在更好地了解碱-二氧化硅反应中反应环的机械性能。使用纳米压痕技术研究了构成反应边缘的碱金属硅酸钙的弹性模量，该弹性模量在碱金属-二氧化硅化学理想化的体系中在碱金属硅酸盐和Ca（OH）2之间的界面处形成。另外，研究了碱金属硅酸钙的相应的钙对二氧化硅的摩尔比。结果表明，在界面处形成的碱金属硅酸钙的弹性模量随钙硅比的增加而增加，反之亦然。此外，可用于与碱金属硅酸盐相互作用以形成碱金属硅酸盐钙的钙越多，钙与二氧化硅的摩尔比越高，因此所形成的碱金属硅酸盐钙的弹性模量越高。这项工作从机械角度为碱硅反应（ASR）导致裂纹的发生与反应边缘的形成如何关联提供了说明性证据。然而，必须强调的是，这项研究中简化的钙-碱-硅酸盐体系与混凝土的实际情况相去甚远。

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