Microstructure of Alkali-Activated Slag in Ultralow Temperature Environments

被引：2

作者：

Liu, Leping ^{[1
]}

Hong, Yao ^{[1
]}

Xu, Yue ^{[1
]}

Li, Yuanyuan ^{[1
]}

He, Yan ^{[2
,3
]}

机构：

[1] Nanning Normal Univ, Coll Chem & Mat, Guangxi Key Lab Nat Polymer Chem & Phys, 175 Mingxiudong Rd, Nanning 530001, Guangxi, Peoples R China

[2] Guangxi Univ, Sch Chem & Chem Engn, 100 Daxuedong Rd, Nanning 530004, Guangxi, Peoples R China

[3] Guangxi Univ, Guangxi Key Lab Petrochem Resource Proc & Proc Int, 100 Daxuedong Rd, Nanning 530004, Guangxi, Peoples R China

来源：

JOURNAL OF MATERIALS IN CIVIL ENGINEERING | 2024年 / 36卷 / 03期

基金：

中国国家自然科学基金;

关键词：

Alkali-activated slag (AAS) material; Alkali activators; Freeze-thaw cycling; Microstructure; C-S-H; BLAST-FURNACE SLAG; FLY-ASH; PHASE EVOLUTION; HYDRATION PRODUCTS; PART I; CEMENT; GEOPOLYMERS; DURABILITY; SHRINKAGE;

D O I：

10.1061/JMCEE7.MTENG-16493

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

In this study, the changes in the phase and microstructure of alkali-activated slag (AAS) in ultralow-temperature environments (-170 degrees C) was experimentally studied by means of X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, thermal gravimetric (TG), scanning electron microscopy energy dispersive X-ray spectroscopy (SEM-EDS), Si29 magic-angle spinning nuclear magnetic resonance (MAS NMR), and pore structure. The results show that as the modulus of water glass increased, the mass loss of AAS after the ultralow-temperature freeze-thaw cycles (ULT-FTC) decreased, the freeze-thaw resistance increased. The ULT-FTC caused the internal structure of the AAS samples using different activators to slip and rearrange. Partial calcium-(alumina)-silicate-hydrate gel [C (A) S H] gel was decalcified. The gel structure formed using 2.0 M water glass as the activator was the most stable. The dense structure with a lower Ca/Si ratio enables the AAS to maintain a relatively stable microstructure after undergoing ULT-FTC.

引用

页数：11

共 56 条

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