Influences of Superplasticizer on the Interaction between Latex Particles and Cement Grains

2013 ◽  
Vol 687 ◽  
pp. 335-340 ◽  
Author(s):  
Dong Dong Han ◽  
Jin Mei Li ◽  
Wei Deng Chen ◽  
Shi Yun Zhong
Keyword(s):  
Zeta Potential ◽  
Cement Paste ◽  
Adsorption Rate ◽  
Test Results ◽  
Polymer Particles ◽  
Latex Particles

In order to have a better understand on the interaction among superplasticizer, latex and cement grains in the fresh cement paste, the zeta potential and the adsorption of polymer on the cement were investigated in this study. The zeta potential was measured by using the ZetaProbe instrument, and the adsorption rate of latex was analyzed by sedimentation test. The zeta potential results show that the zeta potential of pure cement paste is positive and increasing slightly along the first 30mins; the latex particles can be adsorbed by cement grains, comparing with SAE latex, the adsorption of PAE latex is lower, and PAE latex has a smaller influence on the hydration of cement paste; the presence of superplasticizer can affect the adsorption of polymer particles on the cement; the sedimentation test results show that the presence of PC and NF can reduce the adsorption of latex particles, when the dosage of PC is more than 0.3%, the adsorption rate of latex particles is reduced significantly; when the dosage of NF is 1%, the adsorption rate of latexes is reduced less than that in the case of PC.

The Adsorption of Superplasticizers on Cement Particles and its Relation with Dispersibility

2013 ◽  
Vol 687 ◽  
pp. 449-455
Author(s):  
Zi Ming Wang ◽  
Ya Li Wang ◽  
Ming Zhang Lan
Keyword(s):  
Zeta Potential ◽  
Cement Paste ◽  
Isoelectric Point ◽  
Test Results ◽  
Cement Pastes ◽  
Adsorption Behaviors ◽  
Adsorption Amount ◽  
The Relationship

The dispersing effect of superplasticizer is closely related to its adsorption behaviors on the surface of cement particles or the hydrates. But the relationship between the adsorption amount of superplasticizer and the fluidity of cement paste seems uncertain. To investigate the relationship between the adsorption amount and the fluidity of cement paste, three groups of cements with designed compositions and C3A mineral were prepared in lab. Four types of superplasticizer were used to measure the adsorption on various cements. The corresponding zeta potential of cement particles with superplasticzers and the fluidity of cement pastes were tested and analyzed. It was found that the adsorption amount of superplasticizer was inversely related to the fluidity of cement paste for a given superplasticizer. The zeta potential of cement particles in the paste was proportional to the adsorption amount of superplasticizer. The adsorption amount of different superplasticizers at the isoelectric point in C3A-H2O system was determined. The meaning of the “adsorption amount” was discussed. The author proposed that the superplasticizer in cement paste should include three parts, and the role of each part was discussed according to test results and analysis.

Performance of a Slow-Release Type Carboxylic Polymer and its Application

2009 ◽  
Vol 405-406 ◽  
pp. 174-179
Author(s):  
Chong Zhi Li ◽  
Quan Lin Niu ◽  
Guang Ming He ◽  
Nai Qian Feng
Keyword(s):  
Polyethylene Glycol ◽  
Zeta Potential ◽  
Cement Paste ◽  
Methacrylic Acid ◽  
Slow Release ◽  
Test Results ◽  
Monomer Mixture ◽  
High Fluid ◽  
Type Water ◽  
Methoxy Polyethylene Glycol

A slow-release type carboxylic polymer(SLPC) is synthesized with the monomer mixture at a certain Molecule ratio of methacrylic acid, methoxy polyethylene glycol methacrylate and polyethylene glycol di-methacrylate. Test results of the fluidity, Zeta potential and adsorption in cement paste show that the polymer SLPC has the remarkable anti-adsorbing and high fluid-retaining ability for enhancing fluidity of cement paste as time elapsed, concrete experimental results indicated that it could be used to substitute 30～50% polycarboxylic type water-reducer in the same quality for preparing high workability concrete and controlling its slump loss.

Study on Relationship between Structure and Properties of Polycarboxylate Superplasticizer

2012 ◽  
Vol 487 ◽  
pp. 43-47
Author(s):  
Sheng Hua Lv ◽  
Di Li ◽  
Qiang Cao
Keyword(s):  
Acrylic Acid ◽  
Zeta Potential ◽  
Ethyl Ester ◽  
Functional Groups ◽  
Cement Paste ◽  
Ethyl Acrylate ◽  
Structure And Properties ◽  
Polycarboxylate Superplasticizer ◽  
Carboxylic Groups

A polycarboxylate superplasticizer (PCs) was synthesized by copolymerization of allyl polyoxyethylene ethers (APE), acrylic acid (AA), sodium methylallyl Sulfonate (SMAS) and ethyl acrylate (EA). The effect of functional groups and branch chain on PCs properties was investigated by the test of fluidity of cement paste, retardation performance and Zeta potential of cement particles. The results showed that carboxylic groups and ethyl ester groups can improve water reducing ratio and fluidity of cement paste, and the sulfonic groups has an important contributiion to retardation performance of PCs.

scholarly journals SYNTHESIS AND STABILITY OF RESVERATROL-CONJUGATED GOLD NANOPARTICLES MODIFIED WITH POLYETHYLENE GLYCOL

2020 ◽  
pp. 230-236
Author(s):  
RADITYA ISWANDANA ◽  
RICHA NURSELVIANA ◽  
SUTRIYO SUTRIYO
Keyword(s):  
Particle Size ◽  
Gold Nanoparticles ◽  
Polyethylene Glycol ◽  
Zeta Potential ◽  
High Performance ◽  
Entrapment Efficiency ◽  
Test Results ◽  
Novel Method ◽  
The Stability ◽  
Phosphate Buffered Saline

Objective: Gold nanoparticles (AuNPs) are highly useful for drug delivery, but their application is limited by their stability as they readily aggregate.This issue can be prevented by adding a stabilizing agent such as resveratrol (RSV), which is a polyphenol derived from plants, that is used to preventcancer. Therefore, we propose a novel method to prepare stable RSV-conjugated nanoparticles modified with polyethylene glycol (RSV-AuNP-PEG).Methods: In the first step, the Turkevich method was used to synthesize the AuNPs. Then, PEG was added as stabilizer agent and conjugated with RSV.The synthesized conjugates were characterized using ultraviolet-visible spectrophotometry, Fourier transform infrared spectroscopy, particle sizeanalysis, and high-performance liquid chromatography.Results: The obtained RSV-AuNP-PEG had a particle size of 83.93 nm with a polydispersity index (PDI) of 0.562 and formed a translucent purple-redfluid in solution. The zeta potential was −22.9 mV, and the highest entrapment efficiency was 75.86±0.66%. For comparison, the RSV-AuNP solutionwas purple and turbid, the particle size was 51.97 nm with a PDI of 0.694, and the zeta potential was −24.6 mV. The stability test results showed thatthe storage stability of RSV-AuNP-PEG was better than that of AuNP-RSV. Further, the RSV-AuNP-PEG was shown to be most stable in 2% bovine serumalbumin (BSA) while the AuNP-RSV was most stable in 2% BSA in phosphate-buffered saline pH 7.4.Conclusion: These results show that modification of RSV-conjugated AuNPs with PEG effectively prevents their aggregation in storage, but only incertain mediums.

Mixtures of latex particles and the surfactant of opposite charge used as interface stabilizers – influence of particle contact angle, zeta potential, flocculation and shear energy

Soft Matter ◽  
2014 ◽  
Vol 10 (36) ◽  
pp. 7088-7095 ◽  
Author(s):  
Rémi Deleurence ◽  
Caroline Parneix ◽  
Cécile Monteux
Keyword(s):  
Contact Angle ◽  
Zeta Potential ◽  
Latex Particles ◽  
Opposite Charge ◽  
Particle Contact ◽  
Shear Energy

Using mixtures of latex and surfactant of opposite charges we decouple the effect of the charge and contact angle of the particles on the interface stabilization. We find that the key-parameters are the flocculation state of the particles and the shear energy used to produce the foams.

scholarly journals Soil-concrete for use in the 3D printers in the construction of buildings and structures

2018 ◽  
Vol 245 ◽  
pp. 03002 ◽  
Author(s):  
Petr Iubin ◽  
Lubov Zakrevskaya
Keyword(s):  
Rheological Properties ◽  
Cement Paste ◽  
Clay Soil ◽  
Cement Composite ◽  
Cement Composites ◽  
Test Results ◽  
Flow Table ◽  
Key Factor ◽  
3D Printers ◽  
The Cost

Nowadays, the construction of cement composite using 3D printers is considered one of the most promising methods of automation of building processes. However, the compositions of cement composites have several disadvantages, such as high cost, short workability and etc. It has been suggested that clay soil as an additive will help to solve these problems partially. The aim of the work is development the cement compositions with clay soil, for use in 3D printers to construction. The composite consists of cement paste with clay soil and additives. To study printability of a composite the rheological properties in a fresh state were studied. The study of the rheological properties of composites was carried out using a flow table test for mortar. The key factor for determining the suitability of the composite for printing was accepted the diameter of the cone after shaking. The test results showed the possibility of replacing cement paste with clay soil up to 25% which leads to a reduction in the cost and an increase in printability with a slight decrease in the strength of the obtained material to 7%. Utilizing of soil from the construction site provides maximum economic efficiency of the material application.

Zeta potential of clay minerals and quartz contaminated by heavy metals

2005 ◽  
Vol 42 (5) ◽  
pp. 1280-1289 ◽  
Author(s):  
A Kaya ◽  
Y Yukselen
Keyword(s):  
Heavy Metals ◽  
Zeta Potential ◽  
Metal Ions ◽  
Alkaline Earth ◽  
Alkaline Earth Metals ◽  
Ion Concentration ◽  
Test Results ◽  
Ζ Potential ◽  
Pore Fluid Chemistry ◽  
Electrokinetic Decontamination

Laboratory and in situ test results show that electrokinetic decontamination is a promising subsurface decontamination method. However, it has also been reported that several problems arise, such as reverse flow and pH gradient across the anode and the cathode during the electrokinetic decontamination process. Variation in pH alters the zeta (ζ) potential of soils, which is one of the factors affecting the efficiency of contaminant removal by the electrokinetic method. The magnitude of the ζ potential controls the fluid flow rate, whereas its sign controls the flow direction. However, research on how the ζ potential of soils changes under various chemical conditions is limited. In this paper, the effect of pore-fluid chemistry on the ζ potential of kaolinite, montmorillonite, and quartz powder is determined with NaCl, LiCl, CaCl2·2H2O, MgCl2·6H2O, CuCl2, CoCl2, ZnCl2, AlCl3, and Pb(NO3)2. The test results reveal that the ζ potential of the minerals with alkali and alkaline-earth metals changes according to the diffuse electrical double-layer theory. The hydrolyzable metal ions produce two points of zero charge (PZCs), one of which is that of the soil; and the other, that of hydrolyzable oxide. The ζ potential of minerals with hydrolyzable metal ions becomes increasingly positive and reaches its maximum value at neutral pH. It then decreases and again reaches very negative values at alkaline pH values (pH ∼ 10), depending on ion concentration and the bulk precipitation pH of hydrolyzable metals as hydrolyzable oxides. On the basis of the results of this study, it is recommended that the ζ potential of the soils be determined before electrokinetic decontamination.Key words: alkaline-earth metals, electrokinetic decontamination, heavy metals, zeta potential.

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