通过碳酸氢钠诱导碳化改善波特兰水泥-高炉矿渣混合浆料的性能

IF 6.2 2区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Developments in the Built Environment Pub Date : 2024-11-17 DOI:10.1016/j.dibe.2024.100575

Melaku N. Seifu , Daeik Jang , G.M. Kim , Solmoi Park

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引用次数: 0

摘要

添加 NaHCO3 有可能通过促进内部碳化来提高混凝土的性能。本研究调查了在普通硅酸盐水泥-高炉矿渣浆料中掺入 NaHCO3 的影响。结果表明，添加 NaHCO3 对水化过程有影响，并提高了所有矿渣样品的水化热。NaHCO3 会引起内部碳化，促进碳酸钙和不同碳基 AFm 相（如单碳酸盐）的形成。NaHCO3 的加入改善了浆料的孔隙结构，提高了抗氯化物渗透的能力。在矿渣替代率为 70% 的情况下掺入 2% 的 NaHCO3 后，硅酸盐水泥浆样品的氯离子迁移系数降低了 96.5%。样品的抗压强度也有所改善，添加 1% 的 NaHCO3 可提高早期龄期强度，添加 2% 的 NaHCO3 可提高成熟龄期强度。

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Improving properties of Portland cement-blast furnace slag blended paste through sodium bicarbonate-induced carbonation

The addition of NaHCO₃ has the potential to enhance properties of concrete by facilitating internal carbonation. This study investigates the effects of the incorporation of NaHCO₃ into ordinary Portland cement-blast furnace slag paste. The results show that the addition of NaHCO₃ had an impact on the hydration process and increased the heat of hydration on all the slag samples. NaHCO₃ caused internal carbonation and facilitated the formation of calcium carbonate and different carbon-based AFm phases, such as monocarbonate. The incorporation of NaHCO₃ improved the pore structure of the paste and enhanced resistance against chloride penetration. The chloride migration coefficient of the Portland cement paste sample was reduced up to 96.5% with the incorporation of 2% NaHCO₃ at 70% slag replacement. The compressive strength of the samples also showed an improvement with 1% NaHCO₃ addition increasing the early age strength and 2% NaHCO₃ addition increasing the matured age strength.

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来源期刊

Developments in the Built Environment Multiple-

CiteScore

7.40

自引率

1.20%

发文量

审稿时长

22 days

期刊介绍： Developments in the Built Environment (DIBE) is a recently established peer-reviewed gold open access journal, ensuring that all accepted articles are permanently and freely accessible. Focused on civil engineering and the built environment, DIBE publishes original papers and short communications. Encompassing topics such as construction materials and building sustainability, the journal adopts a holistic approach with the aim of benefiting the community.