Influence of nesquehonite seeds on hydration and carbonation of reactive magnesia cement

TY - JOUR

T1 - Influence of nesquehonite seeds on hydration and carbonation of reactive magnesia cement

AU - Li, Zhen

AU - Zhang, Zhichao

AU - Qin, Jihui

AU - Yue, Yanfei

AU - Qian, Jueshi

N1 - © 2023 Elsevier Ltd. All rights reserved.

PY - 2023/12/15

Y1 - 2023/12/15

N2 - Among all carbonation products of reactive magnesia cement (RMC), nesquehonite exhibited the highest CO2 amount of sequestration per molar. Inducing the nesquehonite formation may improve the CO2 sequestration capacity of RMC. In this paper, nesquehonite seeds were introduced to promote the formation of nesquehonite in RMC. The performances of RMCs with 0%, 0.5%, 1%, 1.5% and 2% nesquehonite seeds were studied and compared with that of RMC mixed with hydromagnesite seeds. It was found that the hydration of RMC could be facilitated by nesquehonite seeds, resulting in reduced setting times. The nucleation effect of nesquehonite seeds was demonstrated, resulting in increased nesquehonite formation and carbonation degree. Nesquehonite seeds combined with hydration agent can further promote the compressive strength of RMC through forming more amounts of nesqeuhonite crystals and amorphous hydrated magnesium carbonates. Compared with the hydromagnesite seeds, the nesquehonite seeds showed a more significant increase in the CO2 sequestration capacity of RMC.

AB - Among all carbonation products of reactive magnesia cement (RMC), nesquehonite exhibited the highest CO2 amount of sequestration per molar. Inducing the nesquehonite formation may improve the CO2 sequestration capacity of RMC. In this paper, nesquehonite seeds were introduced to promote the formation of nesquehonite in RMC. The performances of RMCs with 0%, 0.5%, 1%, 1.5% and 2% nesquehonite seeds were studied and compared with that of RMC mixed with hydromagnesite seeds. It was found that the hydration of RMC could be facilitated by nesquehonite seeds, resulting in reduced setting times. The nucleation effect of nesquehonite seeds was demonstrated, resulting in increased nesquehonite formation and carbonation degree. Nesquehonite seeds combined with hydration agent can further promote the compressive strength of RMC through forming more amounts of nesqeuhonite crystals and amorphous hydrated magnesium carbonates. Compared with the hydromagnesite seeds, the nesquehonite seeds showed a more significant increase in the CO2 sequestration capacity of RMC.

KW - Nesquehonite seed

KW - Reactive magnesia cement

KW - Hydration

KW - Carbonation

KW - CO2 sequestration

U2 - 10.1016/j.conbuildmat.2023.134034

DO - 10.1016/j.conbuildmat.2023.134034

M3 - Article

SN - 0950-0618

VL - 409

JO - Construction and Building Materials

JF - Construction and Building Materials

M1 - 134034

ER -