Morphological characteristics of calcium carbonate crystallization in CO₂ pre-cured aerated concrete

Abstract

The work reports different morphological characteristics of CaCO3 formed in an early-age aerated concrete (AC) under different CO2 pressures, uncovering the physicochemical mechanisms of carbonation of cement-based materials affected by CO2 curing.

Spherical CaCO3: Synthesis, Characterization, Surface Modification and Efficacy as a Reinforcing Filler in Natural Rubber Composites

“…Vaterite has a typical hexagonal shape, demonstrating a spherulitic or framboid morphology [26], while aragonite demonstrates an orthorhombic or needle-like shape [27,28]. The most thermodynamically stable phase is calcite, which has a typical trigonal morphology, showing a cubical shape [29,30]. An aqueous medium containing hydroxyl groups, such as glycerol, ethylene glycol, or sucrose, is the key factor in increasing the viscosity of the mixing system, influencing the decrement in particle size [17,20].…”

Tracing carbonation in cementitious slurry using anthocyanin extracted from fresh or stale petals

“…By promoting engineering technologies such as concrete waste carbonation, 11 carbonation curing, 12 etc., the concrete-related CO 2 emission can be signicantly reduced, and the "role" of cement industry may thus change from the largest CO 2 emitter to the largest carbon sink. [12][13][14] Therefore, for the purpose of carbon sequestration in cement industry, tracing carbonation is also essential, as it can help tune the engineering techniques associated with carbon sequestration.…”