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Title: Mechanochemical formation of highly stable amorphous calcium carbonate in calcium silicates: Potential long-term storage of CO2 in cement

Journal Article · · Cement and Concrete Research
 [1];  [2];  [3]
  1. Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States); Nutrien Ag Solutions, Paso Robles, CA (United States)
  2. Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
  3. Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Here, we have investigated mechanochemical reactions with the calcium silicate wollastonite to probe potential mechanisms of sequestration and long-term storage of CO2 as mineral carbonates in cement pastes. Wollastonite, CaSiO3, was milled under ambient and 13C enriched CO2 atmospheres. Milling induced a structure change from monoclinic wollastonite-2M to triclinic-1T, consistent with high pressure treatment. The results from solid-state 13C nuclear magnetic resonance (NMR) spectroscopy shows this process forms an extraordinarily stable amorphous calcium carbonate (ACC) phase that remains despite a high temperature dehydration treatment (130 °C) and persists in the same form after 3 yrs. of storage at ambient conditions. Thermogravimetric analysis (TGA) of these samples indicates that ACC is produced at the similar solid concentrations in both CO2-enriched and ambient atmospheres. The observation of meta-stable ACC due to wollastonite carbonation may play an important role in further exploration and optimization of mineral carbonation reactions for CO2 capturing cement formulations.

Research Organization:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States); Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Engineering & Technology. Office of Small Business Innovation Research (SBIR) and Small Business Technology Transfer (STTR) Programs
Grant/Contract Number:
89233218CNA000001; AC52-07NA27344; SC0011960
OSTI ID:
2318954
Alternate ID(s):
OSTI ID: 2368617
Report Number(s):
LA-UR--23-28183; LLNL--JRNL-863889
Journal Information:
Cement and Concrete Research, Journal Name: Cement and Concrete Research Vol. 176; ISSN 0008-8846
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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