Dissolution and Early Hydration Interaction of C3A-C4AF Polyphase in Water and Aqueous Sulfate Solutions
Shaoxiong Ye, Pan Feng
TL;DR
This study explores how two cement components interact during early hydration, revealing how sulfate affects their dissolution rates.
Contribution
The paper identifies two competing mechanisms by which C4AF modulates C3A dissolution in sulfate environments.
Findings
C4AF dissolution is minimally affected by C3A presence.
C3A dissolution is strongly influenced by C4AF through sulfate-dependent pathways.
Two mechanisms—common-ion suppression and sulfate adsorption acceleration—compete during dissolution.
Abstract
The concurrent dissolution and early hydration of tricalcium aluminate (C3A) and tetracalcium aluminoferrite (C4AF) critically govern early-stage reaction dynamics in Portland cement systems. However, their mutual kinetic interactions during reaction, particularly sulfate-dependent modulation mechanisms, remain poorly understood. Using in-situ digital holographic microscopy (DHM), this study resolved their interaction mechanisms during co-dissolution in aqueous and sulfate-bearing environments. Results reveal asymmetric modulation: while C4AF’s dissolution exhibited limited sensitivity to C3A’s presence, C3A’s kinetics were profoundly altered by C4AF through sulfate-concentration-dependent pathways, which originated from two competing C4AF-mediated mechanisms: (1) suppression via common-ion effects, and (2) acceleration through competitive sulfate species adsorption. These mechanistic…
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Taxonomy
TopicsEnhanced Oil Recovery Techniques · CO2 Sequestration and Geologic Interactions · Calcium Carbonate Crystallization and Inhibition