Year: 2025
Type: conference-paper
Abstract: Natural Mg-rich olivine could potentially serve as a scalable feedstock for Mg-based cements with zero CO2 emissions. This study explores an innovative synthesis of a Mg-based cement by directly reacting olivine with oxalic acid (H2C2O4). The hydration behaviors and cementitious properties of olivine–oxalic acid blends are investigated, as a function of olivine-to-oxalic acid (OL/OA) weight ratio. Higher OL/OA ratio results in faster hydration, while the best compressive strength with up to 32 MPa is obtained at a moderate OL/OA ratio of 3.5 after 28 days. The obtained cements are composed of residual olivine minerals and a dense and compact glushinskite (MgC2O4·2H2O) matrix intermixed with randomly dispersed amorphous silica nanoparticles. The acid–base reaction between Mg-rich olivine and oxalic acid also provides an efficacious strategy for carbon sequestration, as up to 25 wt% of CO2 equivalent can be taken up in hydrated solid phase, potentially rendering this cementitious system carbon negative.
Authors: Jihui Qin, Xing Cheng, Hongyan Ma
Institution: Missouri University of Science and Technology
Language: English
Subfield: Materials Chemistry
Field: Materials Science
Domain: Physical Sciences
Open Access status: gold
Funder: U.S. Department of Energy
OpenAlex ID: W7084091534
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