Effect of polycarboxylate ether superplasticizer (PCE) on dynamic yield stress, thixotropy and flocculation state of fresh cement pastes in consideration of the Critical Micelle Concentration (CMC)

Qian, Ye; Lesage, Karel; Cheikh, Khadija El; Schutter, Geert De

doi:10.1016/j.cemconres.2018.02.019

Cited by 150 publications

(58 citation statements)

References 47 publications

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“…The dynamic yield stress obtained from the equilibrium flow curve model fitting is shown in Figure 1 . Another study [ 22 ] by the authors also showed that with the PCE addition, the dynamic yield stress keeps decreasing. It becomes null at 0.3% of PCE addition; the results are shown in Figure 1 a.…”

Section: Resultsmentioning

confidence: 92%

“…Similarly, the dynamic yield stress keeps decreasing with NSF addition until 0.6% addition over cement by mass, as shown in Figure 1 b. PCE or NSF surfactants adsorb on the surface of cement particles/agglomerates and induce steric hindrance or electrostatic repulsion, thus dispersing the particles/agglomerates and decreasing the dynamic yield stress. It was found that at a high PCE addition, there is a higher percentage of small size particles/agglomerates, and a lower percentage of big size ones (Figure 13 in [ 22 ]).…”

Section: Resultsmentioning

confidence: 99%

“…All mixes had a water to cement ratio ( w / c ) of 0.4 by mass. Detailed description of materials and mixing protocols are presented in [ 22 ] and are briefly described here. Superplasticizers were added 20 after the first contact between the cement powder and water, as adopted by Hot et al [ 23 ].…”

Section: Materials and Methodologymentioning

confidence: 99%

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Different Effects of NSF and PCE Superplasticizer on Adsorption, Dynamic Yield Stress and Thixotropy of Cement Pastes

Qian

Schutter

2018

Materials

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This study compares the differences and similarities of two types of superplasticizers—NSF (Naphthalene Sulfonate Formaldehyde) and PCE (PolyCarboxylate Ester)—in fresh cement paste systems, in terms of adsorption, dynamic yield stress, and thixotropic index. Results show that with either NSF or PCE addition, the more superplasticizer is added, the more it is adsorbed and the more it remains in the interstitial pore solution. The dynamic yield stress and thixotropic index also decrease with increasing addition the amount of either superplasticizer. However, NSF is less efficient in decreasing the dynamic yield stress than PCE. More importantly, the decreasing patterns of dynamic yield stress and thixotropic index are different with NSF and PCE additions; this is tied to the adsorption and dispersing mechanisms of these two types of superplasticizers.

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Section: Resultsmentioning

confidence: 92%

Section: Resultsmentioning

confidence: 99%

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Different Effects of NSF and PCE Superplasticizer on Adsorption, Dynamic Yield Stress and Thixotropy of Cement Pastes

Qian

Schutter

2018

Materials

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“…To our disappointment, this method requires that the CPB is kept stationary and real-time observation of the microstructure changes is not allowed. Quian et al coupled a rheometer and FBRM to study the relationship for cement pastes with different doses of superplasticizer [27]. is provides the possibility to study the rheological and microstructural relationship of CPB.…”

Section: Introductionmentioning

confidence: 99%

Using Coupled Rheometer-FBRM to Study Rheological Properties and Microstructure of Cemented Paste Backfill

Wang

Yang

et al. 2019

Advances in Materials Science and Engineering

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Rheological properties, such as the yield stress, viscosity, and thixotropy, are related to the microstructure of cemented paste backfill (CPB). To highlight the relationship, two instruments were combined to measure the changes in the microstructure and the rheological properties of CPB simultaneously. In this way, the particle/agglomerate size distribution characterized by the focused beam reflectance measurement (FBRM) and the rheological factors measured by the rheometers could be directly linked. The results show that when under shearing, the intrinsic network structure of CPB responds to the shear-induced stresses with the interference of interparticle forces, leading to changes in the rheological behavior. Shear thinning can be found in CPB suspensions with a microstructure that is either loose interconnection or random. With an increase in the shear rate, random collisions among particles become organized in the flow, lowering the yield stress and viscosity. However, when the shear rate exceeds a certain threshold value, the rheological parameters change as a result of shear thickening. The results of this study contribute to better understanding of the complex rheological behavior of CPB.

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“…One is how HPC can retain its existing slump retention capability to ensure that the application of HPC in civil engineering industry can achieve the best performance with high workability. Many recent studies highlight established applications MATEC Web of Conferences 195, 01020 (2018) https://doi.org/10.1051/matecconf/201819501020 ICRMCE 2018 of nanoparticles such as silver nanoparticles, titania polyvinylalcohol-alginate beads, and polycarboxylate ether (PCE) as superplasticizer to rapidly emerging applications in the civil and environmental engineering and discuss future research directions [1][2][3]. Therefore, it has been reported that the addition of superplasticizer can improve the workability of HPC by using a very low w/c ratio [4].…”

Section: Introductionmentioning

confidence: 99%

Effect of added the polycarboxylate ether on slump retention and compressive strength of the high-performance concrete

Jonbi

Arini

Anwar³

et al. 2018

MATEC Web Conf.

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It is well known that workability of high performance concrete (HPC) is dependent on slump value of concrete mixture. Moreover, slump retention is the most sensitive compared to a well-known slump value because it represents the durability of concrete mixture for its applications in the field of civil engineering. This research used the polycarboxylate ether (PCE) to increase slump value of concrete mixture and then verified the effect of PCE on the slump retention and compressive strength of different high-performance concretes. 0%, 0.5%, 1%, 2% of PCE were added into concrete mixture to yield a minimum compressive strength of f’c 50 MPa. The slump retention tests were performed at 0, 15, 30, 45, 60 and 75 minutes while the compressive strength tests were carried out at 3, 7, 14 and 28 days for every concrete sample. The result findings showed that the optimal concrete performance can be achieved by adding 2% of PCE to reach at a slump retention value of 45 minutes and a compressive strength of 53.84 MPa. Effect of PCE on the slump retention and compressive strength has been verified to contribute an insight into the application of a proper designed workability of HPC.

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Effect of polycarboxylate ether superplasticizer (PCE) on dynamic yield stress, thixotropy and flocculation state of fresh cement pastes in consideration of the Critical Micelle Concentration (CMC)

Cited by 150 publications

References 47 publications

Different Effects of NSF and PCE Superplasticizer on Adsorption, Dynamic Yield Stress and Thixotropy of Cement Pastes

Different Effects of NSF and PCE Superplasticizer on Adsorption, Dynamic Yield Stress and Thixotropy of Cement Pastes

Using Coupled Rheometer-FBRM to Study Rheological Properties and Microstructure of Cemented Paste Backfill

Effect of added the polycarboxylate ether on slump retention and compressive strength of the high-performance concrete

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