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Title |
Improvement in Strength of 3D Printed Alkali-activated Slag/Fly Ash Paste
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Authors |
박광민(Kwang-Min Park) ; 이준(Jun Lee) ; 이봉춘(Bong-Chun Lee) |
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DOI |
https://doi.org/10.4334/JKCI.2018.30.6.641 |
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Keywords |
적층제조 ; 3D 프린팅 ; 접착제 분사방식 ; 건설 ; 알칼리 활성화 결합재 Additive Manufacturing ; 3D Printing ; Binder Jetting ; Construction ; Alkali-Activated Materials |
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Abstract |
The purpose of this study is to replace powder with alkali-activated ground granulated blast furnace/Fly ash, apply Binder Jetting 3D printing to the construction field, and improve the compressive strength of 3D Printed output using post-processing. Binder Jetting 3D printing requires strength improvement through post-processing because powder-powder combinations depend on an adhesive. Therefore, in this study, alkali activators such as liquid sodium silicate, powder type sodium silicate, and sodium hydroxide were used as post-processing to increase the compressive strength of Binder Jetting Alkali-activated Slag/Fly Ash Paste As a result, bulk density was improved from 1.10 g/㎤ to 1.48 g/cm3 and water-absorption ratio from 44.9 % to 15.1 %. The compressive strength was significantly increased by 486 % from 1.46 MPa to 7.10 MPa due to the production of C-S-H; Calcite was formed due to the reaction between alkali-activated powder and alkali activators during post-processing.
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