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Surface modification as a technique to improve inter-layer bonding strength in 3D printed cementitious materials

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Abstract
The structural capacity of 3D printed components mainly depends on the inter-layer bonding strength between the different layers. This bond strength is affected by many parameters (e.g. moisture content of the substrate, time gap, surface roughness,..) and any mismatch in properties of the cementitious material may lead to early failure. A common technique to improve inter-layer bonding strength between a substrate and a newly added layer is modifying the substrate surface. For the purpose of this research, a custom-made 3D printing apparatus is used to simulate the printing process and layered specimens with a different delay time (0 and 30 minutes) are manufactured with different surface modification techniques (wire brushing, addition of sand or cement and moisturizing substrate layer). The surface roughness was measured and the effect of the modification technique on the inter-layer-bonding strength was investigated. Results showed that the most effective way to increase the inter-layer bonding is increasing the surface roughness by a comb. This creates a kind of interlock system that will provide a higher inter-layer strength. The compressive strength is most influenced by the addition of cement, where the changing W/C-ratio will create a higher degree of hydration and consequently a higher strength.

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MLA
Van Der Putten, Jolien, et al. “Surface Modification as a Technique to Improve Inter-Layer Bonding Strength in 3D Printed Cementitious Materials.” RILEM TECHNICAL LETTERS, vol. 4, 2019, pp. 33–38, doi:10.21809/rilemtechlett.2019.84.
APA
Van Der Putten, J., De Schutter, G., & Van Tittelboom, K. (2019). Surface modification as a technique to improve inter-layer bonding strength in 3D printed cementitious materials. RILEM TECHNICAL LETTERS, 4, 33–38. https://doi.org/10.21809/rilemtechlett.2019.84
Chicago author-date
Van Der Putten, Jolien, Geert De Schutter, and Kim Van Tittelboom. 2019. “Surface Modification as a Technique to Improve Inter-Layer Bonding Strength in 3D Printed Cementitious Materials.” RILEM TECHNICAL LETTERS 4: 33–38. https://doi.org/10.21809/rilemtechlett.2019.84.
Chicago author-date (all authors)
Van Der Putten, Jolien, Geert De Schutter, and Kim Van Tittelboom. 2019. “Surface Modification as a Technique to Improve Inter-Layer Bonding Strength in 3D Printed Cementitious Materials.” RILEM TECHNICAL LETTERS 4: 33–38. doi:10.21809/rilemtechlett.2019.84.
Vancouver
1.
Van Der Putten J, De Schutter G, Van Tittelboom K. Surface modification as a technique to improve inter-layer bonding strength in 3D printed cementitious materials. RILEM TECHNICAL LETTERS. 2019;4:33–8.
IEEE
[1]
J. Van Der Putten, G. De Schutter, and K. Van Tittelboom, “Surface modification as a technique to improve inter-layer bonding strength in 3D printed cementitious materials,” RILEM TECHNICAL LETTERS, vol. 4, pp. 33–38, 2019.
@article{8668848,
  abstract     = {The structural capacity of 3D printed components mainly depends on the inter-layer bonding strength between the different layers. This bond strength is affected by many parameters (e.g. moisture content of the substrate, time gap, surface roughness,..) and any mismatch in properties of the cementitious material may lead to early failure. A common technique to improve inter-layer bonding strength between a substrate and a newly added layer is modifying the substrate surface. For the purpose of this research, a custom-made 3D printing apparatus is used to simulate the printing process and layered specimens with a different delay time (0 and 30 minutes) are manufactured with different surface modification techniques (wire brushing, addition of sand or cement and moisturizing substrate layer). The surface roughness was measured and the effect of the modification technique on the inter-layer-bonding strength was investigated. Results showed that the most effective way to increase the inter-layer bonding is increasing the surface roughness by a comb. This creates a kind of interlock system that will provide a higher inter-layer strength. The compressive strength is most influenced by the addition of cement, where the changing W/C-ratio will create a higher degree of hydration and consequently a higher strength.},
  author       = {Van Der Putten, Jolien and De Schutter, Geert and Van Tittelboom, Kim},
  issn         = {2518-0231},
  journal      = {RILEM TECHNICAL LETTERS},
  language     = {eng},
  pages        = {33--38},
  title        = {Surface modification as a technique to improve inter-layer bonding strength in 3D printed cementitious materials},
  url          = {http://dx.doi.org/10.21809/rilemtechlett.2019.84},
  volume       = {4},
  year         = {2019},
}

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