Rheological Method to Evaluate Structural Buildup in Self-Consolidating Concrete Cement Pastes

Ferron, Raissa Douglas; Gregori, Amedeo; Sun, Zhihui; Shah, Surendra P.

doi:10.14359/18669

Cited by 10 publications

(2 citation statements)

References 13 publications

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“…For example, Ferron et. al [8] suggested a multiple hysteresis loop method. In this method, first, an equilibrium loop is conducted on the sample.…”

Section: Introductionmentioning

confidence: 99%

Measurements of Breakdown and Buildup of Thixotropy in Cement Pastes Containing Diatomaceous Earth

Hasanzadeh¹,

Sun²

2023

J. Civ. Eng. Constr.

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This paper proposes a comprehensive series of protocols that can make quantitative measurements on both breakdown and buildup aspects of thixotropic behaviors of cement pastes. While measuring breakdown and buildup separately, the correlations between these two aspects have also been investigated. Cement pastes with different water-to-binder ratios (w/b=0.4, 0.5 and 0.6) and different replacement levels of Diatomaceous Earth (DE) (0%, 2%, 6% and 10% by weight of cement) were studied. To simulate the real on-site conditions, parameters such as pressure and temperature were also considered during the measurement. The research found that increase in DE replacement dosage can reduce the energy required to breakdown thixotropic structure of cement pastes while no specific trend on buildup aspect was observed. Among the three used w/b ratios, the 0.5 w/b ratio has the most reduction effect in breakdown energy, where using 10% DE can lead to 65% of energy reduction in breakdown compared to the control sample. However, the measured yield stress for these specimens were very similar to each other. In addition, increase in temperature significantly increases the buildup ratio of cement pastes while increase in pressure as high as 20 MPa has a minimal impact on thixotropic properties of cement pastes.

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“…For example, Ferron et. al [8] suggested a multiple hysteresis loop method. In this method, first, an equilibrium loop is conducted on the sample.…”

Section: Introductionmentioning

confidence: 99%

Measurements of Breakdown and Buildup of Thixotropy in Cement Pastes Containing Diatomaceous Earth

Hasanzadeh¹,

Sun²

2023

J. Civ. Eng. Constr.

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show abstract

“…Most often plasticizing modificators are organic substances representing oligomer or polymer molecules [7,8]. Directional modification, and consequently, regulation of aggregate stability and dispersion rheology belong to crossdisciplinary tasks of colloidal chemistry [9][10][11][12]. In this regard, directional synthesis of modificators with high plasticizing ability and adsorptive activity on the "solid body-solution" boundary remains relevant [13].…”

Section: Introductionmentioning

confidence: 99%

Influence of Oligomers Based on Trifunctional Oxyphenyl on Colloid-Chemical Characteristics of Mineral Dispersions

Poluektova

Shapovalov

2019

MSF

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The paper describes change patterns of colloid-chemical properties of mineral dispersions depending on the number of oxygroups in the aromatic ring of an elementary unit cell of oligomer molecules based on trifunctional oxyphenyls. It is proved that with the increase in the number of oxygroups within an elementary unit from 1 (phenol) to 3 (phloroglucine), the increase in plasticizing ability and plasticizing activity of oligomers is observed, while the plastic viscosity decreases due to the increase in water layer thickness between particles. Adsorption saturation of a surface layer with phloroglucinefurfural oligomers is achieved with smaller concentrations in the solution rather than with resocine-and phenolfurfural oligomers, which indicates the increase in binding energy of adsorbate with an adsorbent surface. The increase in repulsive forces is mainly caused by the formation of developed adsorption layers of oligomers on the surface of disperse phase particles and the increase in surface negative charge during adsorption of anion oligomers with one, two or three oxygroups within an elementary unit.

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Understanding the Structural Build-Up Rate of Cementitious Materials for 3D-Printing

2023

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Rheological Method to Evaluate Structural Buildup in Self-Consolidating Concrete Cement Pastes

Cited by 10 publications

References 13 publications

Measurements of Breakdown and Buildup of Thixotropy in Cement Pastes Containing Diatomaceous Earth

Measurements of Breakdown and Buildup of Thixotropy in Cement Pastes Containing Diatomaceous Earth

Influence of Oligomers Based on Trifunctional Oxyphenyl on Colloid-Chemical Characteristics of Mineral Dispersions

Understanding the Structural Build-Up Rate of Cementitious Materials for 3D-Printing

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