Microstructural changes in alkali-activated slag mortars induced by accelerated carbonation

被引：348

作者：

Li, Ning ^{[1
]}

Farzadnia, Nima ^{[1
]}

Shi, Caijun ^{[1
]}

机构：

[1] Hunan Univ, Coll Civil Engn, Changsha 410082, Hunan, Peoples R China

来源：

CEMENT AND CONCRETE RESEARCH | 2017年 / 100卷

基金：

美国国家科学基金会;

关键词：

Alkali-activated slag; Carbonation; Microstructure; C-S-H; C-S-H; CEMENT-BASED MATERIALS; FLY-ASH; WATER; HYDRATION; RESISTANCE; CONCRETE; EVOLUTION; DIFFUSION; PRODUCTS;

D O I：

10.1016/j.cemconres.2017.07.008

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

This study investigated microstructural changes in alkali-activated slag (AAS) mortars after carbonation using XRD, FTIR, DTG, H-1 NMR and SEM examinations. The results showed that decalcification of C-S-H was the main reaction in carbonation of AAS. The C-S-H with a low Ca/Si was more vulnerable to decalcification in AAS samples activated by waterglass. Besides, AAS mortars demonstrated a lower CaCO3 formation compared to Portland cement mortars. Calcite and vaterite were the major CaCO3 polymorphs produced by carbonation of AAS precipitated mainly in gel pores and spaces in C-S-H interlayers. Meanwhile, the carbonation also caused a certain volume of contraction in AAS mortars.

引用

页码：214 / 226

页数：13

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