Microstructure development and mechanism of hardened cement paste incorporating graphene oxide during carbonation

被引:88
作者
Long, Wu-Jian [1 ]
Gu, Yu-cun [1 ]
Xing, Feng [1 ]
Khayat, Kamal H. [2 ]
机构
[1] Shenzhen Univ, Coll Civil Engn, Shenzhen Durabil Ctr Civil Engn, Guangdong Prov Key Lab Durabil Marine Civil Engn, Shenzhen 518060, Guangdong, Peoples R China
[2] Missouri Univ Sci & Technol, Dept Civil Architectural & Environm Engn, Rolla, MO 65401 USA
关键词
Carbonation; Graphene oxide (GO); Cement; Microstructure; Electrochemistry; ACCELERATED CARBONATION; STRUCTURAL FEATURES; SURFACE-TREATMENT; CONCRETE; BEHAVIOR; MORTAR; PERFORMANCE; STRENGTH; WATER; NANOPLATELETS;
D O I
10.1016/j.cemconcomp.2018.08.016
中图分类号
TU [建筑科学];
学科分类号
0813 ;
摘要
In this work, the carbonation mechanism of cement paste containing graphene oxide (GO) was examined by evaluating its electrochemical, kinetic, and microstructural characteristics under accelerated carbonation, corresponding to a 20% concentration of CO2, a temperature of (30 +/- 1)degrees C, and a relative humidity of 65%-70%. Transport properties of the composites were studied using a non-destructive electrochemical impedance spectroscopy (EIS) technique, while their carbonation kinetics was investigated via thermogravimetric analysis (TGA). The obtained EIS results indicated that the ion diffusion and transport resistance increased after the incorporation of GO, while TGA results revealed that the carbonation of portlandite (CH) and calcium-silicate hydrate (C-S-H) was significantly inhibited during early ages of carbonation due to the increased degree of hydration. In addition, the hybrid GO/hydration products from the carbonation process were characterized, and the formation of a hydrated phase coated with a carbonated layer was observed via scanning electron microscopy and energy dispersive spectroscopy. Porosity variations of the studied materials during carbonation were also evaluated using a mercury intrusion porosimetry method. The porosity of the OPC decreased more significantly during the initial carbonation period as compared to the effect observed for the GO cement-based material.
引用
收藏
页码:72 / 84
页数:13
相关论文
共 68 条
[1]   Reinforcing graphene oxide/cement composite with NH2 functionalizing group [J].
Abrishami, M. Ebrahimizadeh ;
Zahabi, V. .
BULLETIN OF MATERIALS SCIENCE, 2016, 39 (04) :1073-1078
[2]   Molecular dynamics study of the reinforcement effect of graphene in multilayered polymer nanocomposites [J].
Alian, A. R. ;
Dewapriya, M. A. N. ;
Meguid, S. A. .
MATERIALS & DESIGN, 2017, 124 :47-57
[3]   Materials Genome for Graphene-Cement Nanocomposites [J].
Alkhateb, Hunain ;
Al-Ostaz, Ahmed ;
Cheng, Alexander H. -D. ;
Li, Xiaobing .
JOURNAL OF NANOMECHANICS AND MICROMECHANICS, 2013, 3 (03) :67-77
[4]  
[Anonymous], 2007, GB T 175 2007
[5]  
[Anonymous], CEMENT CONCR RES
[6]  
[Anonymous], 2232007 JGT
[7]  
[Anonymous], J HOSPICE PALLIATIVE
[8]  
[Anonymous], 2009, GB/T 50082
[9]   MORPHOLOGY AND CO2 UPTAKE IN TOBERMORITE GEL [J].
BAIRD, T ;
CAIRNSSMITH, AG ;
SNELL, DS .
JOURNAL OF COLLOID AND INTERFACE SCIENCE, 1975, 50 (02) :387-391
[10]   Impedance spectroscopy measurements to study physio-chemical processes in lime-based composites [J].
Ball, R. J. ;
Allen, G. C. ;
Starrs, G. ;
McCarter, W. J. .
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING, 2011, 105 (03) :739-751