期刊
CEMENT & CONCRETE COMPOSITES
卷 114, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.cemconcomp.2020.103708
关键词
3D concrete printing; Sustainability; Compressive strength; Hydration kinetics; Ternary-blended cementitious materials; Calcined clay
资金
- China Scholarship Council [201807720005, 201506120072, 201708360087]
- Construction Technology Research Program - Ministry of Land, Infrastructure and Transport of the Korean Government [17SCIP-B103706-03]
This study aims to investigate the influences of different grades of calcined clay on 3D printability, compressive strength (7 days), and hydration of limestone and calcined clay-based cementitious materials. Calcined clays that contained various amounts of metakaolin were achieved by blending low-grade calcined clay (LGCC) and high-grade calcined clay (HGCC) in three different proportions. The results revealed that increasing the HGCC% ranging from 0 wt% to 50 wt% in calcined clay could: (1) increase the flow consistency; (2) impressively improve the buildability, and reduce the printability window of the fresh mixtures; (3) enhance and accelerate the cement hydration. However, increasing HGCC% led to an increase of air void content in the interface region of the printed sample, which weakened the compressive strength of the printed sample at 7 days. Besides, it confirmed that the cold-joint/weak interface was easily formed by using the fresh mixture with a high structuration rate.
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