journal article·2023-08-01

Electrosteric Control of the Aggregation and Yielding Behavior of Concentrated Portlandite Suspensions

Sharu Bhagavathi Kandy, Narayanan Neithalath, Mathieu Bauchy, Aditya Kumar, Edward Garboczi, Torben Gaedt, Samanvaya Srivastava, Gaurav Sant

Langmuir· Volume 39· Issue 30
Publisher page

Abstract

Portlandite (calcium hydroxide: CH: Ca(OH)2) suspensions aggregate spontaneously and form percolated fractal aggregate networks when dispersed in water. Consequently, the viscosity and yield stress of portlandite suspensions diverge at low particle loadings, adversely affecting their processability. Even though polycarboxylate ether (PCE)-based comb polyelectrolytes are routinely used to alter the particle dispersion state, water demand, and rheology of similar suspensions (e.g., ordinary portland cement suspensions) that feature a high pH and high ionic strength, their use to control portlandite suspension rheology has not been elucidated. This study combines adsorption isotherms and rheological measurements to elucidate the role of PCE composition (i.e., charge density, side chain length, and grafting density) in controlling the extent of PCE adsorption, particle flocculation, suspension yield stress, and thermal response of portlandite suspensions. We show that longer side-chain PCEs are more effective in affecting suspension viscosity and yield stress, in spite of their lower adsorption saturation limit and fractional adsorption. The superior steric hindrance induced by the longer side chain PCEs results in better efficacy in mitigating particle aggregation even at low dosages. However, when dosed at optimal dosages (i.e., a dosage that induces a dynamically equilibrated dispersion state of particle aggregates), different PCE-dosed portlandite suspensions exhibit identical fractal structuring and rheological behavior regardless of the side chain length. Furthermore, it is shown that the unusual evolution of the rheological response of portlandite suspensions with temperature can be tailored by adjusting the PCE dosage. The ability of PCEs to modulate the rheology of aggregating charged particle suspensions can be generally extended to any colloidal suspension with a strong screening of repulsive electrostatic interactions.
Source: europepmc · Quality: candidate unverified · Source record ↗

Research context

OpenAlex topics: Enhanced Oil Recovery Techniques · Grouting, Rheology, and Soil Mechanics · Innovations in Concrete and Construction Materials

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Laboratory for the Chemistry of Construction Materials (LC2), Department of Civil and Environmental Engineering, University of California, Los Angeles, California 90095, United States

Institute for Carbon Management (ICM), University of California, Los Angeles, California 90095, United States

School of Sustainable Engineering and the Built Environment, Arizona State University, Tempe, Arizona 86587, United States

Laboratory for the Physics of AmoRphous and Inorganic Solids (PARISlab), Department of Civil and Environmental Engineering, University of California, Los Angeles, California 90095, United States

Department of Materials Science and Engineering, Missouri University of Science and Technology, Rolla, Missouri 65409, United States

Applied Chemicals and Materials Division, Material Measurement Laboratory, National Institute of Standards and Technology, Boulder, Colorado 80305, United States

Department of Chemistry, Technische Universität München, Lehrstuhl für Bauchemie, Lichtenbergstrasse 4, Garching bei München D-85747, Germany

Department of Chemical and Biomolecular Engineering, University of California, Los Angeles, California 90095, United States

UCLA Center for Biological Physics, University of California, Los Angeles, California 90095, United States

California Nanosystems Institute (CNSI), University of California, Los Angeles, California 90095, United States

Department of Materials Science and Engineering, University of California, Los Angeles, California 90095, United States

Funding

National Institute of Standards and Technology · University of California, Los Angeles · Bayerisch-Kalifornischen Hochschulzentrum · Advanced Research Projects Agency - Energy · University of California · Division of Civil, Mechanical and Manufacturing Innovation · Office of International Science and Engineering · Transcend

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