Concrete slurry waste (CSW) and magnesium slag (MS) have similar compositions to cement, and both pose challenges for conventional reuse. Considering the carbonation activity of MS due to the presence of γ-CS, MS and CSW were utilized to produce a type of low carbon cementitious material through CO curing. The carbonation products and microstructure of the mixture pastes were analyzed using XRD, XPS, FTIR, SEM, MIP, TG-DSC and NMR. The mixture pastes, comprising 26.6 % CSW by weight, demonstrated robust strength, achieving a compressive strength of 52.5 MPa and a flexural strength of 10.7 MPa, with a calculated CO absorption rate of 11.26 %. CSW effectively influenced the CO absorption rate in mixture pastes, actively participated in their matrix structure construction, and contributed to the formation of C-(A)-S-H gel. Interwoven carbonation products, such as SiO-gel, amorphous calcium carbonate, calcite, etc., contributed to the increase in strength. The stability of the mixture pastes was demonstrated by the sustained increase in compressive strength after curing in water for 56 days, which acted as a softening coefficient with a value higher than 1.0. After being cured in water, the hydration of residual silicate minerals in the specimen following carbonation, combined with the reaction of CO released from calcium carbonate with gels, including C–S–H and C-(A)-S-H, promoted the evolution of strength. Water curing promoted the development of finer pores and resulted in a denser matrix structure within the slurries.

中文翻译：

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镁渣和废混凝土浆料制备胶凝材料的性能

混凝土浆料废物（CSW）和镁渣（MS）的成分与水泥相似，两者都对传统的再利用提出了挑战。考虑到由于γ-CS的存在而导致MS的碳化活性，MS和CSW被用来通过CO固化生产一种低碳胶凝材料。利用 XRD、XPS、FTIR、SEM、MIP、TG-DSC 和 NMR 分析了混合物浆体的碳化产物和微观结构。该混合物糊剂含有 26.6% 重量的 CSW，具有很强的强度，抗压强度为 52.5 MPa，弯曲强度为 10.7 MPa，计算得出的 CO 吸收率为 11.26%。 CSW有效地影响了混合物糊体中的CO吸收率，积极参与了其基质结构的构建，并有助于C-(A)-SH凝胶的形成。 SiO-凝胶、无定形碳酸钙、方解石等交织的碳化产物有助于强度的增加。混合物糊剂的稳定性通过在水中固化56天后抗压强度持续增加来证明，其软化系数值高于1.0。在水中固化后，碳化后样品中残留硅酸盐矿物的水合作用，再加上碳酸钙释放的CO与凝胶（包括C-S-H和C-(A)-SH）的反应，促进了C-(A)-SH的演化。力量。水固化促进了更细孔的形成，并导致浆料内形成更致密的基质结构。