Microstructure and mechanical properties of a metakaolinite-based geopolymer nanocomposite reinforced with carbon nanotubes

Abbasi, Saloumeh Mesgari; Ahmadi, Hamidreza; Khalaj, Gholamreza; Ghasemi, Bahar

doi:10.1016/j.ceramint.2016.06.080

Cited by 163 publications

(53 citation statements)

References 19 publications

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“…However, in the 5% spent catalyst MKGP with added 2% NS, the porosity increased up to 43.0%; this may be attributed to NS agglomeration .…”

Section: Resultsmentioning

confidence: 94%

“…In addition, when the NS ratio was increased to 2% for the curing time of 1 day, the bulk density of the MKGP with 5% spent catalyst replacement decreased to 1.31 g/cm 3 . According to Abbasi et al, van der Waals forces between nanomaterials are relatively high, and because of their high surface-area-to-volume ratios, NS particles tend to attract each other and agglomerate, thus rendering the task of dispersing them a challenge [22]. Table 5 presents the porosity of the geopolymers with 0.5%-2% added NS and spent catalyst replacement levels of 0%-20%.…”

Section: Mechanical Characteristicsmentioning

confidence: 99%

“…However, in the 5% spent catalyst MKGP with added 2% NS, the porosity increased up to 43.0%; this may be attributed to NS agglomeration [22]. Figure 1 shows the flexural strength development associated with various NS levels (0.5%-2%) and spent catalyst replacement levels (0%-20%).…”

Section: Mechanical Characteristicsmentioning

confidence: 99%

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Study on the effects Nano‐SiO₂ and spent catalyst ratios on characteristics of metakaolin‐based geopolymers

Cheng¹,

Lo²,

Lin

et al. 2018

Env Prog and Sustain Energy

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This study focused on nano‐SiO2 (NS) addition levels (0.5%–2%) and spent catalyst replacement levels (0%–20%) in the geopolymerization reaction and subsequent network formation of metakaolin‐based geopolymers (MKGP), which affect the mechanical properties and microstructure of the geopolymers. The geopolymers had high flexural strength (72.9 MPa), high bulk density (1.37 g/cm3), and low porosity (41.4%) when 0.5% NS was constantly added and the spent catalyst replacement level was 5%. The geopolymer weight loss was due to the structural water evaporation occurring at temperatures ranging from 350°C to 550°C. Therefore, weight loss was slightly higher than 0.5% NS MKGP without spent catalyst (1.25%) at the spent catalyst replacement level of 5% (1.44%). Regarding the chemical shifts in 29Si MAS NMR spectra, when the geopolymer contained 0.5% NS, the peak center of Q4 (2Al, −97 ppm) shifted to an even higher magnetic of Q4 (3Al, −90 ppm). The NS surface, which was in an active and high free‐energy state, reacted with the geopolymerization system, forming chemical interfacial bonding with the binder phase. The MKGP with 0.5% NS content and 5% spent catalyst replacement yielded more favorable mechanical characteristics and microstructure, according to the flexural strength, TG/DTA, and NMR analyses. © 2018 American Institute of Chemical Engineers Environ Prog, 38: 220–227, 2019

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“…However, in the 5% spent catalyst MKGP with added 2% NS, the porosity increased up to 43.0%; this may be attributed to NS agglomeration .…”

Section: Resultsmentioning

confidence: 94%

Section: Mechanical Characteristicsmentioning

confidence: 99%

See 1 more Smart Citation

Study on the effects Nano‐SiO₂ and spent catalyst ratios on characteristics of metakaolin‐based geopolymers

Cheng¹,

Lo²,

Lin

et al. 2018

Env Prog and Sustain Energy

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“…Carbon nanotubes (0.1%‐0.5%) in geopolymer have an important role in improvement of flexural strength (160%), Young's modulus (109%) and flexural toughness (275%), it could also enhance the electrical conductivity 31 . Results by Abbasi et al 32 also provided that MWCNTs could increased the compressive and flexural strength of geopolymer by ~32% and ~28%, respectively. In our previous work, Yuan et al 33 showed that the CNTs in geopolyer could help to improve its properties, that is, flexural strength (17.5 MPa, increased 42.3%), elastic modulus (12.7 GPa, increased 29.6%), and fracture toughness (0.18 MPa·m 1/2 , increased 38.5%), respectively.…”

Section: Introductionmentioning

confidence: 99%

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

Yan

Zhang

et al. 2020

Int J Applied Ceramic Tech

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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

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“…Concrete is widely used in civil engineering. However, concrete is brittle, and its toughness decreases with its increasing strength, which may lead to cracking in structures [1][2][3]. Engineered cementitious composites (ECC) were developed due to the advantages in toughness and energy absorption capacities.…”

Section: Introductionmentioning

confidence: 99%

ECC Design Based on Uniform Design Test Method and Alternating Conditional Expectation

Yang

Ding

et al. 2019

Mathematical Problems in Engineering

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Engineered cementitious composites (ECC) have higher ultimate tensile strains than normal concrete. The mechanical properties of ECC strongly depend on raw materials and the mix proportions. The uniform design test method and alternating conditional expectation, which is a nonparametric regression analysis method, were used to design the ECC mix proportion. According to the regression analysis, the optimized W/B, S/B, and F/B ranges could be obtained as 0.35–0.42, 0.25–0.3, and 0.02, respectively. The tested proportions for validation were randomly adopted within the range of W/B, S/B, and F/B. The uniaxial compression, tension, and four-point bending tests were conducted to verify the material behaviour of the designed ECC. Results showed that all the specimens had large ultimate tensile strains and high fracture energy capacities, and strain hardening was also observed. The fibers were found to be uniformly distributed in the specimens by using a scanning electron microscope. This paper may provide theoretical and practical guidance for the ECC and other cement-based material mix proportion design.

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Microstructure and mechanical properties of a metakaolinite-based geopolymer nanocomposite reinforced with carbon nanotubes

Cited by 163 publications

References 19 publications

Study on the effects Nano‐SiO₂ and spent catalyst ratios on characteristics of metakaolin‐based geopolymers

Study on the effects Nano‐SiO₂ and spent catalyst ratios on characteristics of metakaolin‐based geopolymers

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

ECC Design Based on Uniform Design Test Method and Alternating Conditional Expectation

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Microstructure and mechanical properties of a metakaolinite-based geopolymer nanocomposite reinforced with carbon nanotubes

Cited by 163 publications

References 19 publications

Study on the effects Nano‐SiO2 and spent catalyst ratios on characteristics of metakaolin‐based geopolymers

Study on the effects Nano‐SiO2 and spent catalyst ratios on characteristics of metakaolin‐based geopolymers

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

ECC Design Based on Uniform Design Test Method and Alternating Conditional Expectation

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Product

Resources

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Study on the effects Nano‐SiO₂ and spent catalyst ratios on characteristics of metakaolin‐based geopolymers

Study on the effects Nano‐SiO₂ and spent catalyst ratios on characteristics of metakaolin‐based geopolymers