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Superplasticizer adsorption isotherms and variation in the zeta

  • compatibility between superplasticizer admixtures and

    Compatibility between superplasticizer admixtures and

    Superplasticizer adsorption isotherms and variation in the zeta potential on CEMII/A-D (a and c) and Silica fume (b and d). The variations in the zeta potential for the silica fume-blended cement (see Fig. 8 c) reached higher absolute values (greater electrostatic stability) than in the other cements.

  • interaction of cement model systems with superplasticizers

    Interaction of cement model systems with superplasticizers

    Jul 01, 2010· 3.2. Adsorption isotherms. Adsorption isotherms were measured by total organic carbon (TOC) analysis. For these experiments, the same materials as for the zeta potential analysis were used. Each suspension is mixed at 5% of solid content with PCE (0, 2, 4, and 7 mg PCE/g solid) on a total volume of 50 mL.

  • (pdf) adsorption of superplasticizer admixtures on alkali

    (PDF) Adsorption of superplasticizer admixtures on alkali

    3. Results and discussion 3.1. Determination of superplasticizer adsorption isotherms on AAS and OPC pastes and the effect of superplasticizers on the zeta potential of AAS and OPC suspensions The adsorption isotherms for the three superplasticizers on 11.7-

  • effect of pore solution composition on zeta potential and

    Effect of Pore Solution Composition on Zeta Potential and

    The results show that the zeta potential is significantly determined by pore solution. In a pore solution of highly concentrated cement suspensions the zeta potential can be characterized by the ratio of calcium to sulfate concentration. Furthermore it was shown that the superplasticizer adsorption is affected the zeta

  • compatibility between superplasticizer admixtures and

    Compatibility between superplasticizer admixtures and

    Superplasticizer adsorption isotherms and variation in the zeta potential on CEMII/B-L (a and c) and Limestone (b and d). 3. Results and discussion 3.1. Control cement (CEM I 52.5 R) Cement paste behaviour is conditioned by the physical–chemical interaction between the particles and the medium.

  • the ettringite superplasticizer interaction and its

    The ettringite superplasticizer interaction and its

    The ettringite superplasticizer interaction and its impact on the ettringite distribution in cement suspensions By F. Winnefeld, A. Zingg, L. Holzer, J. Pakusch, S. Becker PCE adsorption isotherms and zeta potential.

  • compatibility between superplasticizer admixtures and

    Compatibility between superplasticizer admixtures and

    Compatibility between superplasticizer admixtures and cements with mineral additions The adsorption isotherms, zeta potentials and rheological behaviour of

  • impact of zeta potential of early cement hydration phases

    Impact of zeta potential of early cement hydration phases

    The zeta potential of early hydration products of cement was found to be a key factor for superplasticizer adsorption. A highly positive zeta potential results in a strong superplasticizer adsorption whereas a negative zeta potential does not allow adsorption.

  • effect of zinc oxide and al-zinc oxide nanoparticles on

    Effect of Zinc oxide and Al-Zinc oxide nanoparticles on

    Superplasticizer adsorption isotherms and variation in the zeta potential. E. Ghafari et al. / Composites Part B 105 (2016) 160e166 163 was increased per 0.05% by weight of total binder and the amount of adsorbed SP was measured.

  • author's personal copy infoscience

    Author's personal copy Infoscience

    Author's personal copy be similar toOPC, the mechanisms underlying and adsorption of these admixtures on AAS has yet to be studied in detail and veried. The present study will measure adsorption isotherms of three super-plasticizers on AAS and OPC suspensions. The effect of the super-plasticizers on zeta potential and rheological behaviour of both

  • synthesis and properties of a polycarboxylate

    Synthesis and Properties of a Polycarboxylate

    Polycarboxylate superplasticizers (PCEs) are comb-shaped polymers with an anionic backbone and several nonionic pendant chains, which typically are comprised of polyethylene glycols. In this study, the synthesis of a new type of superplasticizer is presented, which does not exhibit the typical comb-shaped form of PCEs but is built up from a linear polyetheramine and a hyperbranched

  • adsorption wikipedia

    Adsorption Wikipedia

    Adsorption constants are equilibrium constants, therefore they obey the van 't Hoff equation: (∂ ⁡ ∂) = −. As can be seen in the formula, the variation of K must be isosteric, that is, at constant coverage. If we start from the BET isotherm and assume that the entropy change is the same for liquefaction and adsorption, we obtain

  • 4th historic mortars conference dadun.unav.edu

    4th Historic Mortars Conference dadun.unav.edu

    Fig. 4 Zeta potential of lime-MK titrated with LS In the fresh state, adsorption isotherms of LS onto pure air lime, and a blended system LS-MK-air lime were assessed. Mathematical treatment of experimental adsorption data showed a better adjustment to a Freundlich model, which establishes a multilayer adsorption model (Table 2).

  • effect of zinc oxide and al-zinc oxide nanoparticles on

    Effect of Zinc oxide and Al-Zinc oxide nanoparticles on

    Adsorption isotherm Zeta potential abstract This studyaims to evaluate the effectof aluminum doped zinc oxide (AZO) and undoped Zinc oxide (ZnO) nanoparticles addition on the superplasticizer adsorption isotherm and rheological properties of cement paste composites. The adsorption isotherm and zeta potential of pastes containing different

  • scalable surface area characterization by electrokinetic

    Scalable Surface Area Characterization by Electrokinetic

    By introducing a new methodology to interpret adsorption isotherms through indicative zeta potential variation, we gauge the appropriateness of electrokinetic analysis in the analysis of surface structure and particle−reagent interactions. 2. METHODOLOGY Solute ionic adsorbates ligating to particle surfaces in

  • synthesis and properties of a polycarboxylate

    Synthesis and Properties of a Polycarboxylate

    Synthesis and Properties of a Polycarboxylate Superplasticizer with adsorption and zeta potential measurements were performed to elucidate the working mechanism of the novel hyper-branched superplasticizer. The overall goal of this study was to adsorption isotherms

  • pce and bns admixture adsorption in sands with different

    PCE and BNS admixture adsorption in sands with different

    Clay-containing sand has been found also to adsorb SPs, reducing the amount available in solution for adsorption by the cement. This study analysed the isotherms for PCE and BNS superplasticiser adsorption on four sands with different fineness and compositions commonly used to

  • cement and concrete research cemchem

    Cement and Concrete Research cemchem

    tion and even the conformation of the adsorbed superplasticizer molecules, etc. It has been found that the driving force of adsorption and the adsorption capability greatly differ from the varied types of superplasticizer [11–15]. NSF superplasticizer is physically adsorbed on the surface of cement grains via electrostatic forces while PCE

  • proceedings of the 10th international congress on the

    Proceedings of the 10th International Congress on the

    nature of the superplasticizer. MgO and Mg(OH) 2 were chosen as model powders because their surfaces and zeta potentials are similar to cement. The two polymers studied, of similar molar mass, contain the same ionic groups but have different charge spacing. The influence of this structural difference on adsorption and zeta potential was studied.

  • synthesis of a novel polycarboxylate superplasticizer with

    Synthesis of A Novel Polycarboxylate Superplasticizer with

    In addition, the novel polycarboxylate superplasticizer is good for reducing the drying shrinking, improving the mesoporous volume and making cement hardenite more compact by proved from N 2 adsorption and desorption measurement. Key Words: Polycarboxylate superplasticizer, Fluidity, Zeta potential, Drying shrinkage, Pore structure, Citrate acid.

  • the influence of cement composition on superplasticizers

    The influence of cement composition on superplasticizers

    cements. Application data of the eight cement-superplasticizer-combinations (heat flow calorimetry and mini-slump tests) are obtained and the surface chemistry of the superplasticizers with cement (zeta potentials and superplasticizer adsorption on cement) is studied.

  • the effect of zno nanoparticles on thermoelectric behavior

    The Effect of ZnO Nanoparticles on Thermoelectric Behavior

    composites were evaluated and the adsorption isotherm and zeta potential of pastes containing different proportions of ZnO and AZO nanoparticles were analyzed. The mechanism of superplasticizer adsorption by nanoparticles was found to be a dominant factor that

  • adsorption of comb –type superplasticizers on calcium

    Adsorption of comb –type superplasticizers on calcium

    adsorption isotherms is almost similar. The only differences are that the amount of superplasticizers adsorbed is different under different conditions. The adsorption increased gradually with the increase of equilibrated concentration of PC and then approached to a constant value. The adsorption isotherms

  • synthesis of a novel polycarboxylate superplasticizer with

    Synthesis of A Novel Polycarboxylate Superplasticizer with

    In addition, the novel polycarboxylate superplasticizer is good for reducing the drying shrinking, improving the mesoporous volume and making cement hardenite more compact by proved from N 2 adsorption and desorption measurement. Key Words: Polycarboxylate superplasticizer, Fluidity, Zeta potential, Drying shrinkage, Pore structure, Citrate acid.

  • the influence of cement composition on superplasticizers

    The influence of cement composition on superplasticizers

    cements. Application data of the eight cement-superplasticizer-combinations (heat flow calorimetry and mini-slump tests) are obtained and the surface chemistry of the superplasticizers with cement (zeta potentials and superplasticizer adsorption on cement) is studied.

  • the effect of zno nanoparticles on thermoelectric behavior

    The Effect of ZnO Nanoparticles on Thermoelectric Behavior

    composites were evaluated and the adsorption isotherm and zeta potential of pastes containing different proportions of ZnO and AZO nanoparticles were analyzed. The mechanism of superplasticizer adsorption by nanoparticles was found to be a dominant factor that

  • adsorption of comb –type superplasticizers on calcium

    Adsorption of comb –type superplasticizers on calcium

    adsorption isotherms is almost similar. The only differences are that the amount of superplasticizers adsorbed is different under different conditions. The adsorption increased gradually with the increase of equilibrated concentration of PC and then approached to a constant value. The adsorption isotherms

  • poly(carboxylate ether)-based superplasticizer achieves

    Poly(carboxylate ether)-based superplasticizer achieves

    Jan 30, 2017· Upon adsorption, zeta potential of suspensions decreased from +4 mV in neat OPC and from +30 mV in neat CAC (Fig. 1c and d) confirming that negatively charged PCEs progressively consume positive

  • adsorption of superplasticizers on calcium aluminate

    Adsorption of Superplasticizers on Calcium Aluminate

    The measurements of Zeta potential carried out on monosulphate dispersed in solutions of the admixtures pointed out a nearly linear increase in the negative charge of the particles up to a value corresponding to the maximum of the adsorption isotherms; beyond

  • pore structure and moisture from water vapour

    PORE STRUCTURE AND MOISTURE FROM WATER VAPOUR

    adsorption) to provide the exact pore network characteristics of cement-based systems, notably in the case of very-high-performance materials, a more pertinent type of experiment was carried out: water vapour desorption and adsorption measurements. From these experiments, isotherms were determined at hygrometrical equilibrium and at

  • effect of cadmium and chromium adsorption on the zeta

    Effect of cadmium and chromium adsorption on the zeta

    The aim of this study was to evaluate the efficiency of two Tunisian mineral clays to capture chromium(III) and cadmium(II) present in landfills leachate and to understand the corresponding mechanisms of sorption. Kinetic studies, adsorption isotherms, particle size distributions as well as zeta

  • characterization of protein adsorption onto silica

    Characterization of protein adsorption onto silica

    The adsorption of lysozyme and ß-lactoglobulin onto silica nanoparticles (diameter 21 nm) was studied in the pH range 2–11 at three different ionic strengths. Since the two proteins have a widely different isoelectric point (pI), electrostatic interactions with the negative silica surface lead to a different dependence of adsorption on pH.

  • the effects of carboxylic acids on the aqueous dispersion

    The Effects of Carboxylic Acids on the Aqueous Dispersion

    The Effects of Carboxylic Acids on the Aqueous Dispersion and adsorption isotherms at 77k in conjunction with BET calculation methods. A 0.1 wt% (0.001 g/mL) suspension of ZrO The conventional variation of zeta potential and a particle dispersion as a function of pH (without

  • cement superplasticizer compatibility

    Cement Superplasticizer Compatibility

    The hydrophilic tip is able to reduce the surface tension of water, and the adsorbed polymer keeps the cement particles apart by electrostatic repulsion (The grinding of cement results in the ground particles having a surface charge (zeta potential). The adsorption of the admixture leads to a decrease of the zeta potential, and eventually

  • application of poly-γ-glutamic acid flocculant to

    Application of Poly-γ-Glutamic Acid Flocculant to

    We examined the effect of poly-γ-glutamic acid flocculant (PGAF) on the removal of ultrafine cement (UFC) particles stabilized by a poly-carboxylate co-polymer, which is a superplasticizer (SP). The flocculation–sedimentation treatment with PGAF successfully removed the SP-stabilized cement particles through the gravitational settling of the formed flocs.

  • surfactant-modified montmorillonite by

    Surfactant-modified montmorillonite by

    The EDX spectra of resultant products and adsorption isotherms of perchlorate on organo-MMTs suggested that a larger content of BODMA-Cl resulted in synthesized adsorbent with a greater adsorption capacity, because neutral BODMA-Cl is predominantly responsible

  • lucia ferrari academia.edu

    Lucia Ferrari Academia.edu

    Adsorption isotherms and zeta potential analysis were performed to characterize polymer displacement in the AFM system on nonreactive model substrates (quartz, mica, calcite, and magnesium oxide) in order to avoid the complexity of cement hydration products. The results show that PCE is strongly adsorbed by positively charged materials.

  • adsorption of superplasticizers on calcium aluminate

    Adsorption of Superplasticizers on Calcium Aluminate

    The measurements of Zeta potential carried out on monosulphate dispersed in solutions of the admixtures pointed out a nearly linear increase in the negative charge of the particles up to a value corresponding to the maximum of the adsorption isotherms; beyond

  • synthesis of a novel polycarboxylate superplasticizer with

    Synthesis of A Novel Polycarboxylate Superplasticizer with

    In addition, the novel polycarboxylate superplasticizer is good for reducing the drying shrinking, improving the mesoporous volume and making cement hardenite more compact by proved from N 2 adsorption and desorption measurement. Key Words: Polycarboxylate superplasticizer, Fluidity, Zeta potential, Drying shrinkage, Pore structure, Citrate acid.

  • pce and bns admixture adsorption in sands with different

    PCE and BNS admixture adsorption in sands with different

    Clay-containing sand has been found also to adsorb SPs, reducing the amount available in solution for adsorption by the cement. This study analysed the isotherms for PCE and BNS superplasticiser adsorption on four sands with different fineness and compositions commonly used to

  • cement superplasticizer compatibility

    Cement Superplasticizer Compatibility

    The hydrophilic tip is able to reduce the surface tension of water, and the adsorbed polymer keeps the cement particles apart by electrostatic repulsion (The grinding of cement results in the ground particles having a surface charge (zeta potential). The adsorption of the admixture leads to a decrease of the zeta potential, and eventually

  • effect of cadmium and chromium adsorption on the zeta

    Effect of cadmium and chromium adsorption on the zeta

    The aim of this study was to evaluate the efficiency of two Tunisian mineral clays to capture chromium(III) and cadmium(II) present in landfills leachate and to understand the corresponding mechanisms of sorption. Kinetic studies, adsorption isotherms, particle size distributions as well as zeta

  • international concrete abstracts portal

    International Concrete Abstracts Portal

    The kinetics of the initial reactions (O-30 min.) are monitored by fast response adiabatic calorimetry; the superplasticizer adsorption, and variations in the ionic composition of the interstitial solution, are also determined at short time intervals during the same period.

  • 钱珊珊

    钱珊珊

    of polycarboxylate superplasticizer, introduce some functional groups which are able to decrease adsorption of clay, develop a polycarboxylate superplasticizer which resists clays and keeps slump to solve the construction problems in the sites, improve the application of PCE nationwide, which will be

  • lucia ferrari academia.edu

    Lucia Ferrari Academia.edu

    Adsorption isotherms and zeta potential analysis were performed to characterize polymer displacement in the AFM system on nonreactive model substrates (quartz, mica, calcite, and magnesium oxide) in order to avoid the complexity of cement hydration products. The results show that PCE is strongly adsorbed by positively charged materials.

  • sursur yy sursursurface chemistryyy national council of

    SurSur yy SurSurSurface Chemistryyy National Council of

    adsorption increases with the increase of surface area per unit mass of the adsorbent at a given temperature and pressure. Another important factor featuring adsorption is the heat of adsorption. During adsorption, there is always a decrease in residual forces of the surface, i.e., there is decrease in surface energy which appears as heat.

  • application of poly-γ-glutamic acid flocculant to

    Application of Poly-γ-Glutamic Acid Flocculant to

    We examined the effect of poly-γ-glutamic acid flocculant (PGAF) on the removal of ultrafine cement (UFC) particles stabilized by a poly-carboxylate co-polymer, which is a superplasticizer (SP). The flocculation–sedimentation treatment with PGAF successfully removed the SP-stabilized cement particles through the gravitational settling of the formed flocs.

  • specific surface area from nitrogen adsorption data at 77

    Specific surface area from nitrogen adsorption data at 77

    Specific surface area from nitrogen adsorption data at 77 K using the zeta adsorption isotherm 17 th Edition of International Conference on Emerging Trends in Materials Science and Nanotechnology April 26-27, 2018 Rome, Italy. Charles A Ward, S Arman Ghaffarizadeh and Seyed Hadi Zandavi

  • combined effect of sodium sulphate and superplasticizer

    Combined Effect of Sodium Sulphate and Superplasticizer

    2010; 13(2) Combined Effect of Sodium Sulphate and Superplasticizer on the Hydration of Fly Ash Blended Portland® Cement 179 were found to influence the superplasticizer adsorption behavior6,7. Up to a certain extent, this can be explained by different zeta potentials of the various cement phases. In the absence of a superplasticizer,

  • characterization of 27 mycotoxin binders and the relation

    Characterization of 27 Mycotoxin Binders and the Relation

    Jan 05, 2015· A large variation in the adsorption of ZEN is seen in all of the types of binders . Yiannikouris et al. compared the ZEN binding properties of a yeast cell extract and a mineral binder and concluded that the yeast-based product had better adsorption properties than the mineral in the higher concentration range .

  • 1. introduction scientific research publishing

    1. Introduction Scientific Research Publishing

    Zeta potential measurements were used to quantify the conditions leading to the stability of TiO 2 dispersions as well as the surface charge. The variation of the zeta potential is shown in Figure 4. The pH variation from 3 to 10 was accompanied with a variation of zeta potential between +35 mV in acidic medium to around −45 mV in basic medium.