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Enhancing thixotropy of fresh cement pastes with nanoclay in presence of polycarboxylate ether superplasticizer (PCE)

Ye Qian (UGent) and Geert De Schutter (UGent)
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Abstract
Nanoclay, a thermal treated, purified attapulgite clay, has been used to increase thixotropy. However, the effect of nanoclay in presence of water reducing agent, such as PCE, on rheology, and the compatibility between nanoclay and PCE have not been well studied. The dynamic yield stress, thixotropic index, characteristic time, and microstructure of fresh cement pastes with combination of nanoclay and PCE addition are measured. It is found that nanoclay has a good compatibility with PCE. Nanoclay increases the dynamic yield stress and enhances the thixotropy of fresh cement pastes with and without PCE addition. The nanoclay addition agglomerates the microstructure at high PCE addition and increases the thixotropic index from bottom value to a high value. This study gives insight of achieving low dynamic yield stress yet high static yield stress and thixotropy mixtures.
Keywords
BEAM REFLECTANCE MEASUREMENT, PURIFIED ATTAPULGITE CLAYS, STATIC, YIELD-STRESS, PALYGORSKITE, FLOCCULATION, MECHANISMS, RHEOMETERS, TOLERANCE, BEHAVIOR, MORTARS, Nanoclay (D), PCE (D), Thixotropy (A), Focused Beam Reflectance, Measurement (FBRM), Stiffening mechanism

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Citation

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Chicago
Qian, Ye, and Geert De Schutter. 2018. “Enhancing Thixotropy of Fresh Cement Pastes with Nanoclay in Presence of Polycarboxylate Ether Superplasticizer (PCE).” Cement and Concrete Research 111: 15–22.
APA
Qian, Y., & De Schutter, G. (2018). Enhancing thixotropy of fresh cement pastes with nanoclay in presence of polycarboxylate ether superplasticizer (PCE). CEMENT AND CONCRETE RESEARCH, 111, 15–22.
Vancouver
1.
Qian Y, De Schutter G. Enhancing thixotropy of fresh cement pastes with nanoclay in presence of polycarboxylate ether superplasticizer (PCE). CEMENT AND CONCRETE RESEARCH. Oxford: Pergamon-elsevier Science Ltd; 2018;111:15–22.
MLA
Qian, Ye, and Geert De Schutter. “Enhancing Thixotropy of Fresh Cement Pastes with Nanoclay in Presence of Polycarboxylate Ether Superplasticizer (PCE).” CEMENT AND CONCRETE RESEARCH 111 (2018): 15–22. Print.
@article{8615730,
  abstract     = {Nanoclay, a thermal treated, purified attapulgite clay, has been used to increase thixotropy. However, the effect of nanoclay in presence of water reducing agent, such as PCE, on rheology, and the compatibility between nanoclay and PCE have not been well studied. The dynamic yield stress, thixotropic index, characteristic time, and microstructure of fresh cement pastes with combination of nanoclay and PCE addition are measured. It is found that nanoclay has a good compatibility with PCE. Nanoclay increases the dynamic yield stress and enhances the thixotropy of fresh cement pastes with and without PCE addition. The nanoclay addition agglomerates the microstructure at high PCE addition and increases the thixotropic index from bottom value to a high value. This study gives insight of achieving low dynamic yield stress yet high static yield stress and thixotropy mixtures.},
  author       = {Qian, Ye and De Schutter, Geert},
  issn         = {0008-8846},
  journal      = {CEMENT AND CONCRETE RESEARCH},
  language     = {eng},
  pages        = {15--22},
  publisher    = {Pergamon-elsevier Science Ltd},
  title        = {Enhancing thixotropy of fresh cement pastes with nanoclay in presence of polycarboxylate ether superplasticizer (PCE)},
  url          = {http://dx.doi.org/10.1016/j.cemconres.2018.06.013},
  volume       = {111},
  year         = {2018},
}

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