Study of MgO-activated slag as a cementless material for sustainable spray-based 3D printing
3D concrete printing technology greatly facilitates automation in construction which enhances efficiency, productivity and sustainability. This study develops a slag-based mixture as a cementless material for sustainable spray-based 3D printing. Effects of MgO and fly ash cenosphere (FAC) addition o...
| Main Authors: | , , , , , , , , |
|---|---|
| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
| Published: |
2021
|
| Subjects: | |
| Online Access: | https://hdl.handle.net/10356/148288 |
| _version_ | 1826125715493355520 |
|---|---|
| author | Lu, Bing Zhu, Weiping Weng, Yiwei Liu, Zhixin Yang, En-Hua Leong, Kah Fai Tan, Ming Jen Wong, Teck Neng Qian, Shunzhi |
| author2 | School of Mechanical and Aerospace Engineering |
| author_facet | School of Mechanical and Aerospace Engineering Lu, Bing Zhu, Weiping Weng, Yiwei Liu, Zhixin Yang, En-Hua Leong, Kah Fai Tan, Ming Jen Wong, Teck Neng Qian, Shunzhi |
| author_sort | Lu, Bing |
| collection | NTU |
| description | 3D concrete printing technology greatly facilitates automation in construction which enhances efficiency, productivity and sustainability. This study develops a slag-based mixture as a cementless material for sustainable spray-based 3D printing. Effects of MgO and fly ash cenosphere (FAC) addition on setting, hydration and rheological properties of fresh mixtures are investigated to obtain the optimal mixture. Results show that inclusion of MgO effectively reduces initial setting time of the fresh mixtures. With 40 wt% of GGBS replaced by MgO, initial setting time is greatly reduced from 305 min to 67 min (78% reduction). Fourier-Transformed Infrared (FTIR) spectra suggest the acceleration is plausibly due to the physical aspects. Furthermore, the FTIR spectra show that MgO can effectively activate the slag and also improve water retention. Rheological tests reveal that FAC addition generally reduces dynamic yield stress and plastic viscosity while increases static yield stress of the fresh mixtures, resulting in lower pumping pressures and higher critical ratios. The mixture with 20 wt%/40 wt% FAC addition has 29%/31% lower pumping pressure and 78%/68% higher critical ratio compared with plain MgO-activated slag material, respectively. Hence, the material with tailored rheology leads to better delivery and deposition performance of the mixture and overall spray-printing quality. An optimal mixture was finally selected based on setting, hydration, rheological properties and spray performance. The developed cementless mixture was successfully applied in the vertical spray-based 3D printing of filament and profile, which confirmed its feasibility in engineering applications. |
| first_indexed | 2024-10-01T06:40:52Z |
| format | Journal Article |
| id | ntu-10356/148288 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T06:40:52Z |
| publishDate | 2021 |
| record_format | dspace |
| spelling | ntu-10356/1482882021-05-08T20:11:41Z Study of MgO-activated slag as a cementless material for sustainable spray-based 3D printing Lu, Bing Zhu, Weiping Weng, Yiwei Liu, Zhixin Yang, En-Hua Leong, Kah Fai Tan, Ming Jen Wong, Teck Neng Qian, Shunzhi School of Mechanical and Aerospace Engineering School of Civil and Environmental Engineering Singapore Centre for 3D Printing Engineering Additive Manufacturing Sustainability 3D concrete printing technology greatly facilitates automation in construction which enhances efficiency, productivity and sustainability. This study develops a slag-based mixture as a cementless material for sustainable spray-based 3D printing. Effects of MgO and fly ash cenosphere (FAC) addition on setting, hydration and rheological properties of fresh mixtures are investigated to obtain the optimal mixture. Results show that inclusion of MgO effectively reduces initial setting time of the fresh mixtures. With 40 wt% of GGBS replaced by MgO, initial setting time is greatly reduced from 305 min to 67 min (78% reduction). Fourier-Transformed Infrared (FTIR) spectra suggest the acceleration is plausibly due to the physical aspects. Furthermore, the FTIR spectra show that MgO can effectively activate the slag and also improve water retention. Rheological tests reveal that FAC addition generally reduces dynamic yield stress and plastic viscosity while increases static yield stress of the fresh mixtures, resulting in lower pumping pressures and higher critical ratios. The mixture with 20 wt%/40 wt% FAC addition has 29%/31% lower pumping pressure and 78%/68% higher critical ratio compared with plain MgO-activated slag material, respectively. Hence, the material with tailored rheology leads to better delivery and deposition performance of the mixture and overall spray-printing quality. An optimal mixture was finally selected based on setting, hydration, rheological properties and spray performance. The developed cementless mixture was successfully applied in the vertical spray-based 3D printing of filament and profile, which confirmed its feasibility in engineering applications. National Research Foundation (NRF) Accepted version 2021-05-03T07:37:30Z 2021-05-03T07:37:30Z 2020 Journal Article Lu, B., Zhu, W., Weng, Y., Liu, Z., Yang, E., Leong, K. F., Tan, M. J., Wong, T. N. & Qian, S. (2020). Study of MgO-activated slag as a cementless material for sustainable spray-based 3D printing. Journal of Cleaner Production, 258, 120671-. https://dx.doi.org/10.1016/j.jclepro.2020.120671 0959-6526 https://hdl.handle.net/10356/148288 10.1016/j.jclepro.2020.120671 2-s2.0-85079642072 258 120671 en Journal of Cleaner Production © 2020 Elsevier Ltd. All rights reserved. This paper was published in Journal of Cleaner Production and is made available with permission of Elsevier Ltd. application/pdf |
| spellingShingle | Engineering Additive Manufacturing Sustainability Lu, Bing Zhu, Weiping Weng, Yiwei Liu, Zhixin Yang, En-Hua Leong, Kah Fai Tan, Ming Jen Wong, Teck Neng Qian, Shunzhi Study of MgO-activated slag as a cementless material for sustainable spray-based 3D printing |
| title | Study of MgO-activated slag as a cementless material for sustainable spray-based 3D printing |
| title_full | Study of MgO-activated slag as a cementless material for sustainable spray-based 3D printing |
| title_fullStr | Study of MgO-activated slag as a cementless material for sustainable spray-based 3D printing |
| title_full_unstemmed | Study of MgO-activated slag as a cementless material for sustainable spray-based 3D printing |
| title_short | Study of MgO-activated slag as a cementless material for sustainable spray-based 3D printing |
| title_sort | study of mgo activated slag as a cementless material for sustainable spray based 3d printing |
| topic | Engineering Additive Manufacturing Sustainability |
| url | https://hdl.handle.net/10356/148288 |
| work_keys_str_mv | AT lubing studyofmgoactivatedslagasacementlessmaterialforsustainablespraybased3dprinting AT zhuweiping studyofmgoactivatedslagasacementlessmaterialforsustainablespraybased3dprinting AT wengyiwei studyofmgoactivatedslagasacementlessmaterialforsustainablespraybased3dprinting AT liuzhixin studyofmgoactivatedslagasacementlessmaterialforsustainablespraybased3dprinting AT yangenhua studyofmgoactivatedslagasacementlessmaterialforsustainablespraybased3dprinting AT leongkahfai studyofmgoactivatedslagasacementlessmaterialforsustainablespraybased3dprinting AT tanmingjen studyofmgoactivatedslagasacementlessmaterialforsustainablespraybased3dprinting AT wongteckneng studyofmgoactivatedslagasacementlessmaterialforsustainablespraybased3dprinting AT qianshunzhi studyofmgoactivatedslagasacementlessmaterialforsustainablespraybased3dprinting |