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Enhancing the Interlayer Bond in Printed Concrete Structures

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Concrete 3D printing is a new, innovative technology for the construction industry with the potential to save cost on labor and material. An optimal mixture design for printable concrete was determined by experimenting with two viscosity modifying admixtures (VMAs): Acti-Gel and polyacrylamide (PAM). PAM was found to enhance the rheology and cohesiveness of concrete. This project investigated improvements to the interfacial bond between layers of concrete. Test results indicated that geometric interlocking enhanced shear strength while a liquid adhesive enhanced tensile strength. Scanning electron microscopy revealed the PAM microstructure bridging across the interface and anchoring to the hydrated C-S-H structure. It is concluded that PAM is the most suitable VMA for printable concrete.

  • This report represents the work of one or more WPI undergraduate students submitted to the faculty as evidence of completion of a degree requirement. WPI routinely publishes these reports on its website without editorial or peer review.
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  • E-project-120919-130739
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  • 2019
Date created
  • 2019-12-09
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