TY - JOUR
T1 - Influence of carbon nanotubes on printing quality and mechanical properties of 3D printed cementitious materials
AU - Ali, Mohd Mukarram
AU - Nassrullah, Ghaith
AU - Abu Al-Rub, Rashid K.
AU - El-Khasawneh, Bashar
AU - Ghaffar, Seyed Hamidreza
AU - Kim, Tae Yeon
N1 - Publisher Copyright:
© 2024 The Authors
PY - 2024/4
Y1 - 2024/4
N2 - This paper presents the impact of incorporating carbon nanotubes (CNTs) into the 3D printing of cementitious materials, along with the effective dispersion of CNTs. Compared to the control mix, adding CNTs with superplasticizer significantly enhanced the printing quality by reducing the error in height of two-layers from 38% to 30% and an 81% enhancement in the buildability. Moreover, rheology properties revealed shear-thinning behaviour with lower viscosity, resulting in improved flowability. The progressive increase in CNT concentrations up to 0.2% yielded a noteworthy improvement in the mechanical properties. At 28 days, the incorporation of 0.2% CNTs resulted in a significant increase in the flexural strength, compressive strength, and Young's modulus by 99%, 72%, and 43%, respectively, compared to the mix containing silica fume. Microstructural investigation of the CNT-cement matrix revealed nanoscale crack bridges formed by CNTs, reinforcing the cementitious material and improving its mechanical properties.
AB - This paper presents the impact of incorporating carbon nanotubes (CNTs) into the 3D printing of cementitious materials, along with the effective dispersion of CNTs. Compared to the control mix, adding CNTs with superplasticizer significantly enhanced the printing quality by reducing the error in height of two-layers from 38% to 30% and an 81% enhancement in the buildability. Moreover, rheology properties revealed shear-thinning behaviour with lower viscosity, resulting in improved flowability. The progressive increase in CNT concentrations up to 0.2% yielded a noteworthy improvement in the mechanical properties. At 28 days, the incorporation of 0.2% CNTs resulted in a significant increase in the flexural strength, compressive strength, and Young's modulus by 99%, 72%, and 43%, respectively, compared to the mix containing silica fume. Microstructural investigation of the CNT-cement matrix revealed nanoscale crack bridges formed by CNTs, reinforcing the cementitious material and improving its mechanical properties.
KW - Additive manufacturing
KW - Carbon nanotubes
KW - Compressive strength
KW - Flexural strength
KW - Nanoscale bridges
KW - Optimal mix design
KW - Printability
UR - http://www.scopus.com/inward/record.url?scp=85189001244&partnerID=8YFLogxK
U2 - 10.1016/j.dibe.2024.100415
DO - 10.1016/j.dibe.2024.100415
M3 - Article
AN - SCOPUS:85189001244
SN - 2666-1659
VL - 18
JO - Developments in the Built Environment
JF - Developments in the Built Environment
M1 - 100415
ER -