Effect of filler type and content on mechanical properties and microstructure of sand concrete made with superfine waste sand

Jiang, Chaohua; Guo, Wenwen; Chen, Hui; Zhu, Yanan; Chen, Jin

doi:10.1016/j.conbuildmat.2018.10.167

Cited by 37 publications

(10 citation statements)

References 35 publications

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“…5, 6 and 7 for MSA, AESA and OSA. MSA and AESA show almost the same appearance and reveal the existence of major peaks at 20° and 21° for MSA 14° and 18° for AESA of kaolinite and mica/illite, which correspond to the pattern of the amorphous nature (Bahoria et al 2018;Yin et al 2018), while OSA shows many peaks corresponding to the position 2 21°, 26°, 27°, 29°, 31°, 33°, 36°, 38°, 39°, 41°, 43°, 46°, 48°, 50° and 53°, respectively, whereas mica/illite predominate over quartz (Jiang et al 2018;Benafqir et al 2019). If the material under investigation is crystalline, well-defined peaks are observed, while non-crystalline or amorphous system shows a hollow instead of well-defined peaks (Hajji et al 2017;Zhao et al 2017).…”

Section: X-ray Diffraction Analysis (Xrd)mentioning

confidence: 93%

Adsorption of lead(II) from aqueous solution using Africa elemi seed, mucuna shell and oyster shell as adsorbents and optimization using Box–Behnken design

et al. 2020

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The aim of this study was to model and optimize the adsorption of Pb(II) ions from an aqueous solution using Africa elemi seed, mucuna shell and oyster shell modified with orthophosphorous acid used as adsorbents. The influence of operational parameters such as adsorbent dosage, initial pH and contact time was evaluated by response surface methodology (RSM). The interactions between the operational parameters were evaluated using Box-Behnken design of response surface methodology. The optimum conditions for maximum removal of Pb(II) ions were observed at pH of 2.0, 100 mg adsorbent dosage and 70 min of contact time, with correlation coefficient R 2 , 0.996 for Africa elemi seed adsorbent; pH of 6.0, 100 mg adsorbent dosage and 40 min contact time with R 2 0.996 for mucuna shell adsorbent; and pH of 6.0, 100 mg adsorbent dosage and contact time of 40 min for oyster shell adsorbent. The ANOVA results obtained from the RSM were analyzed using secondorder polynomial equations, and the contour plots showed the interaction among the variables of the adsorption. This shows that the prepared low-cost adsorbents can be effectively adopted for the removal of Pb(II) ions from industrial wastewaters.

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Section: X-ray Diffraction Analysis (Xrd)mentioning

confidence: 93%

Adsorption of lead(II) from aqueous solution using Africa elemi seed, mucuna shell and oyster shell as adsorbents and optimization using Box–Behnken design

et al. 2020

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“…e X-ray diffractograms of the sand before and after adsorption shows almost the same appearance and reveal the existence of several characteristic peaks of quartz and calcite [25,26]. For unsaturated sand, these two elements have a codominance indicated by the major peaks corresponding to the position 2θ, 27.7°and 29.7°, respectively [27][28][29][30][31]. Whereas for saturated sand, quartz predominates over calcite with the appearance of two unidentified peaks at 2θ, 43.41°and 51.08°, which can be attributed to the effluent components of the tannery.…”

Section: X-ray Diffractionmentioning

confidence: 83%

Continuous Adsorption Modeling and Fixed Bed Column Studies: Adsorption of Tannery Wastewater Pollutants Using Beach Sand

Mouhri

Merzouki²,

Belhassan³

et al. 2020

Journal of Chemistry

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is study deals with the removal of residual pollutants from tanning wastewater by continuous adsorption mechanism, using local sand as a low-cost adsorbent. e possibility of pretreating a complex tannery effluent heavily loaded with a natural material such as sand is significant. e characterization of the adsorbent before and after continuous adsorption was performed by X-ray diffraction, Fourier transform infrared spectroscopy, and scanning electron microscopy. Column studies were also carried out to evaluate the performance of the adsorbent and the efficiency of column adsorption. e adsorption kinetic rate seems to be strongly influenced by certain parameters such as the particle size of the material used, the withdrawal rate of the influent and the height of the adsorbent bed, and optimized parameters were found to be 63 μm, 15 ml·min − 1 , and 7 cm, respectively, and the color removal has achieved maximum values which vary between 95 and 100%. e results suggest that sand can be used as an economical adsorbent for the removal of color from the wastewater of the tanning industries.

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“…The pore peak around µm (marked A in the insert panel in Figure 4) may denote the coarse capillary pores between the cement clinkers and the coarse pores in the interfacial transition zone (ITZ) between the aggregates and the cement matrix. The pore peak at 200 nm (marked B) may represent the capillary pores between the cement hydrates (or termed as the inter-particle space [41]). The peak at the thinner size (marked C) may reflect the thin capillary pores and coarse gel pores: the space between the layered C-S-H gel clusters.…”

Section: Pore Structure Associated Ice Contentmentioning

confidence: 99%

Quasi-Liquid Layer on Ice and Its Effect on the Confined Freezing of Porous Materials

Zeng

2019

Crystals

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Freezing of the water confined in thin pores can be destructive to the porous frame, but the effect of the quasi-liquid layer (QLL) between the confined ice and the pore walls remains still far from being fully understood. In the present study, the physical origins of the intermediate phase of QLL were discussed by thermodynamic analyses. Different interactions on QLL bring different models to estimate its thickness, which generally decays with temperature decreasing. Four representative models of QLL thickness were selected to unveil its effect on the growing rates and extents of ice in a concrete. The engineering consequences of the confined freezing were then discussed in the aspects of effective pore pressures built from the confined ice growth and deformations framed by a poro-elastic model. Overall, thickening QLL depresses ice growing rates and contents and, consequentially, decreases pore pressures and material deformations during freezing. The QLL corrections also narrow the gaps between the predicted and measured freezing deformations. The findings of this study contribute to profound understandings of confined freezing that may bridge over physical principles and engineering observations.

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Effect of filler type and content on mechanical properties and microstructure of sand concrete made with superfine waste sand

Cited by 37 publications

References 35 publications

Adsorption of lead(II) from aqueous solution using Africa elemi seed, mucuna shell and oyster shell as adsorbents and optimization using Box–Behnken design

Adsorption of lead(II) from aqueous solution using Africa elemi seed, mucuna shell and oyster shell as adsorbents and optimization using Box–Behnken design

Continuous Adsorption Modeling and Fixed Bed Column Studies: Adsorption of Tannery Wastewater Pollutants Using Beach Sand

Quasi-Liquid Layer on Ice and Its Effect on the Confined Freezing of Porous Materials

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