Untitled

Chung, D.D.L.

doi:10.1023/a:1013889725971

Cited by 135 publications

(16 citation statements)

References 194 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…This issue can be circumvented by the combined use of EG and silica fume, which is an admixture that decreases the pore size and contributes to the damping due to its nanoparticulate nature [85][86][87].…”

Section: Exfoliated Graphite Compositesmentioning

confidence: 99%

A review of exfoliated graphite

2015

Self Cite

View full text Add to dashboard Cite

Exfoliated graphite (EG) refers to graphite that has a degree of separation of a substantial portion of the carbon layers in the graphite. Graphite nanoplatelet (GNP) is commonly prepared by mechanical agitation of EG. The EG exhibits clinginess, due to its cellular structure, but GNP does not. The clinginess allows the formation of EG compacts and flexible graphite sheet without a binder. The exfoliation typically involves intercalation, followed by heating. Upon heating, the intercalate vaporizes and/or decomposes into smaller molecules, thus causing expansion and cell formation. The sliding of the carbon layers relative to one another enables the cell wall to stretch. The exfoliation process is accompanied by intercalate desorption, so that only a small portion of the intercalate remains after exfoliation. The most widely used intercalate is sulfuric acid. The higher concentration of residue in unwashed EG causes the relative dielectric constant (50 Hz) of the EG to be 360 (higher than 120 for KOH-activated GNP), compared to the value of 38 for the water-washed case. An EG compact is obtained by the compression of EG at a pressure lower than that used for the fabrication of flexible graphite. Compared to flexible graphite, EG compacts are mechanically weak, but they exhibit viscous character, outof-plane electrical/thermal conductivity and liquid permeability. The viscous character (flexural loss tangent up to 35 for the solid part of the compact) stems from the sliding of the carbon layers relative to one another, with the ease of the sliding enhanced by the exfoliation process.

show abstract

Section: Exfoliated Graphite Compositesmentioning

confidence: 99%

A review of exfoliated graphite

2015

Self Cite

View full text Add to dashboard Cite

show abstract

“…One of the most used active additions is silica fume [7][8][9][10]. On one hand, it has been established by various authors that silica fume addition results in an improvement in durability-related characteristics such as permeability [11][12][13], electrical resistivity [14,15] and chloride diffusivity [16][17][18]. These parameters are of fundamental importance as they affect the corrosion of reinforcing steel, which many authors consider to be the most severe pathology affecting reinforced concrete structures [19].…”

Section: Introductionmentioning

confidence: 99%

Short-Term Performance of Sustainable Silica Fume Mortars Exposed to Sulfate Attack

Ortega

Esteban

Williams³

et al. 2018

Sustainability

View full text Add to dashboard Cite

Nowadays, the reuse of wastes is essential in order to reach a more sustainable environment. The cement production results in CO2 emissions which significantly contribute to anthropogenic greenhouse gas emissions. One way to reduce them is by partially replacing clinker by additions, such as silica fumes or other wastes. On the other hand, the pore structure of cementitious materials has a direct influence on their service properties. One of the most popular techniques for characterizing the microstructure of those materials is mercury intrusion porosimetry. In this work, this technique has been used for studying the evolution of the pore network of mortars with different percentages of silica fume (until 10%), which were exposed to aggressive sodium and magnesium sulfate solutions up to 90 days. Between the results of this technique, intrusion-extrusion curves and logarithms of differential intrusion volume versus pore size curves were studied. This characterization of the pore network of mortars has been complemented with the study of their compressive strength and their steady-state ionic diffusion coefficient obtained from samples’ resistivity. Generally, silica fume mortars showed different performance depending on the aggressive condition, although the greatest deleterious effects were observed in the medium with presence of both magnesium and sodium sulfates.

show abstract

“…Addition of silica fume in fiber cementitious materials would improve the concrete properties and durability [13] and is beneficial for fiber dispersion [14,15]. In addition, silica fume would increase the bond between fibers and mortar [16] and strengthen the interfacial zone by decreasing the number and size of cracks [17].…”

Section: Introductionmentioning

confidence: 99%

Engineering Properties and Correlation Analysis of Fiber Cementitious Materials

Lin

Cheng

et al. 2014

Materials

View full text Add to dashboard Cite

This study focuses on the effect of the amount of silica fume addition and volume fraction of steel fiber on the engineering properties of cementitious materials. Test variables include dosage of silica fume (5% and 10%), water/cement ratio (0.35 and 0.55) and steel fiber dosage (0.5%, 1.0% and 2.0%). The experimental results included: compressive strength, direct tensile strength, splitting tensile strength, surface abrasion and drop-weight test, which were collected to carry out the analysis of variance to realize the relevancy and significance between material parameters and those mechanical properties. Test results illustrate that the splitting tensile strength, direct tensile strength, strain capacity and ability of crack-arresting increase with increasing steel fiber and silica fume dosages, as well as the optimum mixture of the fiber cementitious materials is 5% replacement silica fume and 2% fiber dosage. In addition, the Pearson correlation coefficient was conducted to evaluate the influence of the material variables and corresponds to the experiment result.

show abstract

Untitled

Cited by 135 publications

References 194 publications

A review of exfoliated graphite

A review of exfoliated graphite

Short-Term Performance of Sustainable Silica Fume Mortars Exposed to Sulfate Attack

Engineering Properties and Correlation Analysis of Fiber Cementitious Materials

Contact Info

Product

Resources

About