Effects of magnesium content and carbonation on the multiscale pore structure of alkali-activated slags

Effects of magnesium content and carbonation on the multiscale pore structure of alkali-activated slags
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镁含量和碳化对碱激活渣多尺度孔隙结构的影响

DOI:
10.1016/j.cemconres.2020.105979
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发表时间:
2020
影响因子:
11.4
通讯作者:
White, Claire E.
White, Claire E.
中科院分区:
工程技术1区
文献类型:
--
作者:
Wang, Sarah Y.;McCaslin, Eric;White, Claire E.

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虽然抗CO2水泥材料在石油和天然气行业至关重要,但与油井水泥生产相关的CO2排放量要求开发具有增强抗碳酸化性的低CO2替代品。用于碱活化炉渣(AAS)的较高镁含量的高炉炉渣前体已显示出增加对加速的碳酸化诱导的降解的抗性。这项调查评估的影响,样品年龄,AAS镁含量,和碳酸化(暴露于100%CO2)AAS(纳米至微米)的多尺度孔结构。通过氮吸附法、压汞法和X射线显微层析技术,获得了普通波特兰水泥(OPC)和硅酸盐激发矿渣浆体的孔径分布和扩散曲折度。这些孔形态性质表明,AAS比OPC更能抵抗加速碳酸化后的孔结构降解,并且AAS中镁含量的增加显示出改善其在碳酸化过程中对凝胶脱钙和毛细孔形成的抵抗性。
While CO2-resistant cement materials are crucial in oil and gas industries, the CO2emissions associated with manufacturing oil-well cements have necessitated the development of lower-CO2alternatives with enhanced carbonation resistance. A higher magnesium content blast furnace slag precursor for alkali-activated slag (AAS) has been shown to increase resistance to accelerated carbonation-induced degradation. This investigation assesses the effects of sample age, AAS magnesium content, and carbonation (exposure to 100% CO2) on the multiscale pore structure of AASs (nanometers to microns). The pore size distributions and diffusion tortuosities of ordinary Portland cement (OPC) and silicate-activated slag pastes are obtained through the techniques of nitrogen sorption, mercury intrusion porosimetry, and X-ray microtomography. These pore morphology properties show AAS to be more resistant to pore structural degradation following accelerated carbonation than OPC, and increased magnesium content in AAS is shown to improve its resistance to gel decalcification and capillary pore formation during carbonation.
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