Impact of nesquehonite on hydration and strength of MgO-based cements

IF 10.9 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Cement and Concrete Research Pub Date : 2024-12-20 DOI:10.1016/j.cemconres.2024.107772

Paula Montserrat-Torres, Frank Winnefeld, Barbara Lothenbach

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引用次数: 0

Abstract

Hydrated magnesium carbonate cements prepared from MgO and carbonates such as hydromagnesite (Mg₅(CO₃)₄(OH)₂·4H₂O) or nesquehonite (MgCO₃ˑ3H₂O) have potential for carbon sequestration during hardening. This study investigates the hydration of MgO/nesquehonite blends with up to 50 wt% of nesquehonite. Nesquehonite is highly reactive in the presence of MgO and water. The replacement of 50 wt% MgO by nesquehonite causes a significant increase of compressive strength at higher nesquehonite contents with up to 43–44 MPa after 28 days. However nesquehonite delays early hydration and strength development. Progressive changes in XRD peak position and peak broadening with increasing amount of carbonate indicate the formation of hydrous carbonate-containing brucite, HCB, with variable content of gel-like water and CO₂ as confirmed by FTIR and TGA. This research indicate a high potential of nesquehonite to permanently store CO₂ in MgO-based cements, as up to 15 wt% of CO₂ can be taken up in the hydrated solid phase.

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来源期刊

Cement and Concrete Research 工程技术-材料科学：综合

CiteScore

20.90

自引率

12.30%

发文量

318

审稿时长

53 days

期刊介绍： Cement and Concrete Research is dedicated to publishing top-notch research on the materials science and engineering of cement, cement composites, mortars, concrete, and related materials incorporating cement or other mineral binders. The journal prioritizes reporting significant findings in research on the properties and performance of cementitious materials. It also covers novel experimental techniques, the latest analytical and modeling methods, examination and diagnosis of actual cement and concrete structures, and the exploration of potential improvements in materials.