Production of vaterite via wet carbonation of carbide residue: Enhancing cement properties and CO2 sequestration

Zhou, Yeqiang; Wu, Fengshun; Jinag, Lei; Lu, Bao; Hou, Guihua; Zhu, Jianping

doi:10.1016/j.cemconcomp.2024.105549

Cited by 7 publications

(1 citation statement)

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“…Several studies utilizing organic additives as admixtures to produce ACC and vaterite have observed increases in the compressive strength and flexural strength. These increases in strength are attributed to smaller grain sizes and higher surface areas of metastable CaCO 3 , which increase reactivity. ,, Our study shows that bisphosphonates influence not only the polymorph and morphology but also the rate of CaCO 3 precipitation and that the specific effects are contingent upon chain length and functional group. These insights enable the design of novel molecules that facilitate the formation of the desired CaCO 3 phases.…”

Section: Results and Discussionmentioning

confidence: 99%

Synthesis of Metastable Calcium Carbonate Using Long-Chain Bisphosphonate Molecules

Nguyen,

Hazoor,

Vuong

et al. 2024

ACS Appl. Mater. Interfaces

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Cementation in construction materials primarily relies on the aqueous precipitation of minerals such as carbonates and silicates. The kinetics of nucleation and growth play a critical role in the development of strength and durability, yet our understanding of the kinetic controls governing phase formation and porosity reduction in cements remains limited. In this study, we synthesized bisphosphonate molecules with varying alkyl chain lengths and functional groups to investigate their impact on calcium carbonate precipitation. Through conductivity measurements, infrared spectroscopy, and thermogravimetric analysis, we uncovered the selective formation of polymorphs and the specific incorporation of these molecules within the carbonate matrix. Further, in situ atomic force microscopy revealed that these molecules influenced the morphology of the precipitates, indicating a possible effect on the ionic organization through sorption mechanisms. Interestingly, amorphous calcium carbonate (ACC), when formed in the presence of bisphosphonates, showed metastability for at least seven months without inhibiting further calcium carbonate precipitation. Our research sheds light on the diverse mechanisms by which organic additives can modify mineral nucleation and growth, offering valuable insights for the control and enhancement of carbonate-based cementation processes.

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Section: Results and Discussionmentioning

confidence: 99%