Structural rebuilding of concrete materials in 3D printing with various types of additives
Traditional constructing method can be time-consuming. Limits also exist in traditional construction method. Concrete 3D printing is a kind of novel in-situ construction method which eliminate the use of form works. With the help of robots, construction can be flexible in 3D space. Manpower an...
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| Format: | Thesis-Master by Coursework |
| Language: | English |
| Published: |
2019
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| Subjects: | |
| Online Access: | http://hdl.handle.net/10356/77866 |
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| Institution: | Nanyang Technological University |
| Language: | English |
| Summary: | Traditional constructing method can be time-consuming. Limits also exist in traditional
construction method. Concrete 3D printing is a kind of novel in-situ construction method
which eliminate the use of form works. With the help of robots, construction can be
flexible in 3D space. Manpower and time can be effectively saved. As precondition of
successfully applying the concrete 3D printing, some rheology property (yield stress,
viscosity, thixotropy) of the concrete paste must be satisfied because there is no
formwork. Inter layer bonding property is one of the weakness of 3D printed concrete
structures. This paper investigates different additives (retarder, reducer, superplasticizer
and accelerator) which may help obtain required properties for successful 3D printing.
The hydration, thixotropy and side effect are also considered and the hydration process
and rheology changing in the time domain are combined to analyze the structural
building process. A molecular absorb model is used to explain the micro-scale
mechanism. At last, mechanical property of the printed filaments is used to estimate the
result. |
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