期刊
JOURNAL OF SUSTAINABLE CEMENT-BASED MATERIALS
卷 12, 期 4, 页码 427-440出版社
TAYLOR & FRANCIS LTD
DOI: 10.1080/21650373.2022.2074911
关键词
Limestone calcined clay cement (LC3); microstructure development; metal intrusion; quantitative SEM analysis; pore structure; flexural strength
The pore structure development and hydration process of limestone calcined clay cement (LC3) were analyzed using a metal intrusion-enhanced imaging approach. It was found that the microstructural development of LC3 is initially inhomogeneous but becomes more uniform at later ages, leading to improved mechanical performance. LC3 exhibits more efficient particle packing, reducing the volume/connectivity of micro-pores and accounting for its notable flexural strength.
Limestone calcined clay cement (LC3) holds promise as a new type of sustainable cement-based material, but the mechanisms underpinning its engineering performance are still poorly understood. Here, a metal intrusion-enhanced imaging approach was employed to quantitatively analyze and link the pore structure development of LC3 to its hydration process, i.e. solid-phase development, and mechanical performance. We found that the early age microstructural development in LC3 is inhomogeneous, with the perimeter of limestone particles displaying higher porosity relative to that surrounding calcined clay and clinker. At later ages, the formation of carboaluminates and calcium-aluminate-silicate-hydrates homogenized the overall microstructure of LC3, thereby delivering improved mechanical performance. Overall, our analysis suggested a more efficient particle packing in LC3 mixes, which decreases the volume/connectivity of micro-pores and can account for LC3's notable flexural strength. These findings can assist the development of improved LC3 binder formulations alongside other ternary binders with possibly higher limestone additions.
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