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Title |
Properties of Alkali-Activated Slag-Based, 3D-Printable SHCC Reinforced with Selvage Fibers
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Authors |
현창진(Chang-Jin Hyun) ; 김효정(Hyo-Jung Kim) ; 이방연(Bang-Yeon Lee) ; 김윤용(Yun-Yong Kim) |
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DOI |
https://doi.org/10.11112/jksmi.2025.29.6.172 |
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Keywords |
3D 프린팅; 변형경화형 시멘트 복합재료(SHCC); 알칼리 활성 슬래그; 셀비지 PE 섬유 3D printing; Strain-hardening cementitious composites (SHCC); Alkali-activated slag; selvage PE fibers |
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Abstract |
In this study, mixtures for 3D printing of alkali-activated slag (AAS)-based strain-hardening cementitious composites (SHCC) were developed. The rheological properties, buildability, and post-curing mechanical performance of each mixture were systematically evaluated according to the type and dosage of alkali activators and admixtures. Working time was secured by analyzing the change in rheology based on the activator type, and extrudability and shape retention performance were optimized by controlling the content of the viscosity-modifying agent (VMA) and ethylene vinyl chloride (EVCL). The experimental results showed that the mixture using the Type-B activator (Type-B13%) secured sufficient working time over 150 minutes, demonstrating high applicability for the 3D printing process. It was confirmed that the most stable 8-layer buildability was achieved when 8 wt% of EVCL was added. SHCC specimens extracted from blocks printed with the optimized mixture exhibited distinct strain-hardening behavior and multiple micro-cracks in uniaxial tension tests, recording a high average tensile strain capacity of 4.9%.
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