Effects of graphene oxide on the geopolymerization mechanism determined by quenching the reaction at intermediate states

Yan, Shu; He, Peigang; Jia, Dechang; Duan, Xiaoming; Yang, Zhihua; Wang, Shengjin; Zhou, Yu

doi:10.1039/c6ra26340b

Cited by 23 publications

(19 citation statements)

References 40 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Besides, absorption near 3440 cm −1 is assigned to OH vibration of free water. The FT‐IR spectra of the products of CNTs/KGP foams polymerization reaction after adding nanotubes are consistent with the results of various KGP matrix 41 . It is noted that the peak at 1389 cm −1 is attributed to C‐OH stretching bond from CNTs, which remains after geopolymerization process 42 .…”

Section: Resultssupporting

confidence: 85%

Synthesis and mechanical properties of lightweight hybrid geopolymer foams reinforced with carbon nanotubes

Yan

Zhang

et al. 2020

Int J Applied Ceramic Tech

Self Cite

View full text Add to dashboard Cite

A lightweight hybrid geopolymer foams reinforced with carbon nanotubes (CNTs) was exploited by adding the CNTs into geopolymeric matrix through hydrogen peroxide method. The synergistic effects of nanotubes and foaming agent on the phase evolution, microstructure, and mechanical properties were investigated. After introduction of nanotubes, the geopolymer foams reinforced with CNTs (CNTs/KGP) still showed amorphous structure. Porosity of the foams increased with the H2O2 content and decreased with the increase in CNTs content. The addition of CNTs (1‐9 wt%) in foams refined the distribution of pore size from 523 to 352 μm. Compression strength of the CNTs/KGP samples elevated with the increasing content of CNTs, which was contributed to the crack propagation and bridging of CNTs in foams. The CNTs/KGP foams with considerable porosity show potential applications in adsorption, filtration, membrane supports, other industries, etc

show abstract

Section: Resultssupporting

confidence: 85%

Synthesis and mechanical properties of lightweight hybrid geopolymer foams reinforced with carbon nanotubes

Yan

Zhang

et al. 2020

Int J Applied Ceramic Tech

Self Cite

View full text Add to dashboard Cite

show abstract

“…Rietveld quantification of amorphous phases was done by considering the broad humps in powder X-ray diffraction (XRD) spectra, a method that has been applied in literature before [45,46]. Characteristic humps indicating amorphous phases for metakaolin are with 2θ between 18° and 38° [47], respectively between 20° and 30° for fly ash [48].…”

Section: Methodsmentioning

confidence: 99%

“…To measure the mass loss of hardened geopolymer powder samples up to 1000 °C, TGA-DSC (thermogravimetric analysis-differential scanning calorimeter) was performed with a STA 449 F5 Jupiter (Netzsch, Selb, Germany). Therefore, geopolymers were crushed and grinded with acetone which led to rapid evaporation of the water in the sample and to a stop of reaction, a method comparable to storing test specimens in acetone [46] or ethanol/acetone mixtures [47] to stop the reaction. For each measurement 35–40 grams of dry powder was heated up to 1000 °C at a heating rate of 20 °C/min.…”

Section: Methodsmentioning

confidence: 99%

Reactivity and Microstructure of Metakaolin Based Geopolymers: Effect of Fly Ash and Liquid/Solid Contents

et al. 2019

View full text Add to dashboard Cite

Geopolymers are inorganic binders based on mixtures of an aluminosilicate powder with an alkali-silicate solution. Properties of geopolymers are strongly determined by the type of reactive solid, the liquid/solid ratio of paste and, amongst others, the Si/Al ratio of the formed geopolymer network. In this study, fly ash blended metakaolin based geopolymers with varying liquid/solid ratios (l/s), activated by potassium silicate solution, are investigated. Reactivity of metakaolin and fly ash was investigated by powder X-ray diffraction (XRD) and dissolution tests. Reactivity, mechanical properties and microstructure of hardened pastes were analyzed by setting and compressive strength tests, mercury intrusion porosimetry (MIP), capillary water absorption tests, thermogravimetric analysis-differential scanning calorimeter (TGA-DSC), isothermal calorimetry and scanning electron microscopy with energy dispersive spectroscopy (SEM-EDS). The results show that substitution of metakaolin by fly ash as well as variation of l/s brings advantages up to a certain degree, but also has a considerable influence on the pore size distribution, mechanical properties, Si/Al ratio of the geopolymer network and the content of bound water.

show abstract

“…In the study of the performance of GO geopolymers at different times, it was found that within 0 to 24 hours, RGO binds well to the geopolymer matrix. As the reaction time increases, the degree of densi-fication increases and the amorphousness of the material [110] decreases [104]. In another study [105] reported the effect of reduced GO content on graphene-geopolymer nanocom-posites.…”

Section: Research Progress Of Graphene Modified Geopolymermentioning

confidence: 98%

“…The results showed that the compressive strength and flexural strength of geopolymers increased by 1.44 times and 2.16 times, respectively, after adding 1% GNPs. Yan et al have conducted a number of graphene-related experi-mental studies [104][105][106]. In the study of the performance of GO geopolymers at different times, it was found that within 0 to 24 hours, RGO binds well to the geopolymer matrix.…”

Section: Research Progress Of Graphene Modified Geopolymermentioning

confidence: 99%

Review on the research progress of cement-based and geopolymer materials modified by graphene and graphene oxide

Liu

Huang

et al. 2020

Nanotechnology Reviews

193

View full text Add to dashboard Cite

AbstractIn recent years, with the higher requirements for the performance of cement-based materials and the call for energy conservation and environmental protection, a wave of research on new materials has set off, and various high-performance concrete and more environmentally friendly geopolymers have appeared in the public. With a view to solving the defects of energy consumption, environmental protection and low toughness of traditional cement-based materials. At the same time, nanomaterials have become a focus of current research. Therefore, the research on the properties of cement-based materials and geopolymers modified by graphene and its derivatives has aroused extensive interest of researchers. Graphene-based nanomaterials are one of them. Because of their large specific surface area, excellent physical properties have been favored by many researchers. This paper reviews the research progress of graphene-based nanomaterials in improving the properties of cement-based materials and geopolymer materials, and points out the main challenges and development prospects of such materials in the construction field in the future.

show abstract

Effects of graphene oxide on the geopolymerization mechanism determined by quenching the reaction at intermediate states

Abstract: Schematic diagram of graphene oxide on the geopolymerization of rGO/KGP.

Cited by 23 publications

References 40 publications

Synthesis and mechanical properties of lightweight hybrid geopolymer foams reinforced with carbon nanotubes

Synthesis and mechanical properties of lightweight hybrid geopolymer foams reinforced with carbon nanotubes

Reactivity and Microstructure of Metakaolin Based Geopolymers: Effect of Fly Ash and Liquid/Solid Contents

Review on the research progress of cement-based and geopolymer materials modified by graphene and graphene oxide

Contact Info

Product

Resources

About