Hardened oil well cement paste modified with TiO2@SiO2 nanoparticles: Physical and chemical properties

被引：13

作者：

Batista, Giovanni dos Santos ^{[1
]}

Takimi, Antonio Shigueaki ^{[2
]}

da Costa, Eleani Maria ^{[1
]}

机构：

[1] Pontif Catholic Univ Rio Grande Do Sul, Sch Technol, 6681 Ipiranga Ave,Bldg 30,Room 111-F, BR-90619900 Porto Alegre, Rio Grande Do S, Brazil

[2] Univ Fed Rio Grande do Sul, Sch Engn, 9500 Bento Goncalves Ave,Bldg 43427,Room 216, BR-91501970 Porto Alegre, Rio Grande Do S, Brazil

来源：

CONSTRUCTION AND BUILDING MATERIALS | 2023年 / 367卷

关键词：

Core; shell; Nanoparticle dispersion; Hydration; Oil well cement paste; Microstructure; Polycarboxylate; C-S-H; POLYCARBOXYLATE SUPERPLASTICIZERS; BLENDED CEMENTS; GRAPHENE OXIDE; HYDRATION; NANOSILICA; SILICA; HEAT; MICROSTRUCTURE; CONSTRUCTION;

D O I：

10.1016/j.conbuildmat.2022.130282

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

Core/shell TiO2@SiO2 nanoparticles (nTS) were added to cement class G, and their physical and chemical properties were investigated with and without polycarboxylate (PC). The hardened cement pastes were analyzed through gas pycnometry, Brunauer-Emmett-Teller (BET), field emission scanning electron microscopy (FE-SEM), and compressive strength. For hydration characterization, portlandite quantification, and C-S-H analysis, Xray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), and 29Si magic-angle spinning nuclear magnetic resonance (29Si MAS NMR) were performed. The nTS demonstrated a self-dispersive behavior and increased the specific mass and matrix compacity. Moreover, the total pore volume decreased, and the compressive strength increased. The nTS improved the hydration degree, reduced portlandite content, and increased C-S-H main chain length.

引用

页数：11

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