Evaluation of zeta potential of calcined clays and time-dependent flowability of blended cements with customized polycarboxylate-based superplasticizers

Sposito, Ricarda; Maier, Matthias; Beuntner, Nancy; Thienel, Karl‐Christian

doi:10.1016/j.conbuildmat.2021.125061

Cited by 37 publications

(15 citation statements)

References 59 publications

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“…A further increase in the pH valueabove the PZC, the surface was turned positive. These results reveal high consistency with previous reported zeta potential (Sposito et al, 2021).…”

Section: Zeta-potential Measurementssupporting

confidence: 93%

From waste to treat waste: Exploitation of marble dust as a harmful pollutant to a green adsorbent for dyes and heavy metals from industrial wastewater

Attia¹,

Farghaly²,

Saleh³

et al. 2022

Physicochem. Probl. Miner. Process.

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The marble dust as a harmful industrial waste of marble fabrication was evaluated as aneconomical and efficient green adsorbent for Acid Red-1 dye and lead ions. The XRD, XRF, particle size, surface area and zeta-potential measurements were used to characterize the marble dust. The removal efficiency was optimized by studying several parameters such as pH, temperature, contact time, adsorbent dose and initial concentration. The optimum removal was achieved at pH 6, 20C after 60 min in the presence of 2.5g/L marble dust. The rates of adsorption were found to follow the pseudo-second-order model. The results showed better fitting to Freundlich isotherm. The thermodynamic studies revealed that the adsorption process is spontaneous, exothermic and favorable at low temperature. The free energy (∆G°), enthalpy (∆H°), and entropy (∆S°) changes were calculated to predict the nature of adsorption.The removal efficiency was improved by calcination of the marble at 700C. Application for textilewastewater showed high removal efficiency up to 99.9%of inorganic and organic pollutants. The product of treatment was used in the concrete and bricks manufactured, so there is nogeneration of second-order pollutants.

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“…A further increase in the pH valueabove the PZC, the surface was turned positive. These results reveal high consistency with previous reported zeta potential (Sposito et al, 2021).…”

Section: Zeta-potential Measurementssupporting

confidence: 93%

From waste to treat waste: Exploitation of marble dust as a harmful pollutant to a green adsorbent for dyes and heavy metals from industrial wastewater

Attia¹,

Farghaly²,

Saleh³

et al. 2022

Physicochem. Probl. Miner. Process.

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show abstract

“…[ 51 ] When the absolute value of zeta potential was greater than 30 mV, it indicated that the system changed from an unstable state to a stable state. [ 52 ] Presently, the highest absolute value of 28.3 mV was already very close to the stabilization condition, which represented a zeta potential region were particles tend to stay apart rather than agglomerate. In case of SA modified Wo, it can be clearly seen that the absolute value of zeta potential decreased gradually with the increase of SA amount, stabilizing around −17 mV eventually.…”

Section: Resultsmentioning

confidence: 76%

“…[51] When the absolute value of zeta potential was greater than 30 mV, it indicated that the system changed from an unstable state to a stable state. [52] Presently, the…”

Section: Influence Of Surface Modifier On the Zeta Potential Of Wo Fi...mentioning

confidence: 97%

Comparative study on the mechanical and thermal properties of polycarbonate composites reinforced by KH570/SA/SDBS modified wollastonite fibers

Chen

Bao

Zhang³

et al. 2022

Polymer Composites

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In order to increase the applicability of wollastonite (Wo) in polycarbonate (PC) polymer, surface modification of Wo was carried out using different modifiers containing silane coupling agent KH570, stearic acid (SA), and sodium dodecylbenzene sulfonate. The physical, physic-chemical, and application properties of modified Wo were evaluated. Results showed that KH570 modified Wo had narrower particle size distribution, higher absolute zeta potential and were more evenly distributed. Scanning electron microscope study confirmed their changes in morphology and aspect ratio during the modification process. The tensile strength of Wo/PC composites, in which KH570-modified Wo was used were superior to those in which original Wo or other modifiers modified samples were used. The maximum tensile strength of 65 ± 1 MPa was obtained by adding 15 wt% KH570-modified Wo. Thermal analysis indicated that adding Wo to the polycarbonate increased the residue content but decreased the thermal decomposition temperature and glass transition temperature slightly, regardless of unmodified or modified Wo. These results indicated that the well-modified Wo mineral had the potential to replace expensive carbon and glass fibers as fillers in polycarbonate products.

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“…The current study considered, in addition to the adsorption of SO 3 on CSH phases [ 22 , 57 ], the adsorption of ions from the pore solution onto the negatively charged surface of the CC particles [ 58 ] as a major reason for the different shift in aluminate reaction [ 24 , 59 ]. In this context, various metaclay minerals exhibit markedly different surface properties (e.g., zeta potential), as shown by Schmid and Plank through interactions with superplasticizers [ 58 ].…”

Section: Resultsmentioning

confidence: 99%

Calcined Clays from Nigeria—Properties and Performance of Supplementary Cementitious Materials Suitable for Producing Level 1 Concrete

2023

Self Cite

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In this work, four naturally occurring (two kaolinite-rich and two smectite-rich) clay samples were collected from different areas around the Ashaka cement production plant, located in Gombe State, Nigeria and calcined in a laboratory. The mineralogical characterization of the clays was carried out by XRD. The hydration kinetics of the calcined clay–cement systems were monitored by isothermal calorimetry. Workability was determined using the flow table method. The reactivity of the calcined clays was determined from the solubility of Si and Al ions and the strength activity index. All calcined clays studied met the requirements of ASTM C618 for the use of natural pozzolans as a partial replacement for hydraulic cement. The metasmectite clays yielded a higher specific surface area, increased water demand, and less reactive Si and Al ions compared to the metakaolin clays. The two calcined clay groups require the addition of superplasticizer to achieve a workability class similar to the Portland cement mortar system. They can be used to replace Portland cement at replacement levels of up to 45%, in combination with limestone powder to form an LC3 cement, thereby achieving at least a “Level 1” reduction in greenhouse gas emissions.

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Evaluation of zeta potential of calcined clays and time-dependent flowability of blended cements with customized polycarboxylate-based superplasticizers

Cited by 37 publications

References 59 publications

From waste to treat waste: Exploitation of marble dust as a harmful pollutant to a green adsorbent for dyes and heavy metals from industrial wastewater

From waste to treat waste: Exploitation of marble dust as a harmful pollutant to a green adsorbent for dyes and heavy metals from industrial wastewater

Comparative study on the mechanical and thermal properties of polycarbonate composites reinforced by KH570/SA/SDBS modified wollastonite fibers

Calcined Clays from Nigeria—Properties and Performance of Supplementary Cementitious Materials Suitable for Producing Level 1 Concrete

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