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Qamar Shahzad

 

Qamar Shahzad

Tongji University, China

Abstract Title: Effects of Interstrip and Interlayer Bonding on Anisotropic Behavior in Additively Manufactured Concrete

Biography: Qamar Shahzad, from the College of Civil Engineering, Tongji University, specializing in the field of 3D concrete printing. He holds a keen interest in exploring innovative approaches to construction and has dedicated his research to advancing the capabilities and applications of 3D printing technology in the realm of civil engineering. With a focus on sustainable and efficient construction methods, his work aims to revolutionize traditional building practices through the integration of cutting-edge techniques. His research endeavors are driven by a passion for addressing contemporary challenges in the construction industry and paving the way for future developments in the field.

Research Interest: The construction industry is rapidly advancing with the introduction of 3D concrete printing (3DCP), offering significant advantages over conventional building methods. However, uncertainties persist about its practical application, especially concerning the anisotropic behavior of 3D printed concrete (3DPC). Therefore, this study seeks to investigate how the mechanical properties of 3DPC are affected by the properties of its interfacial bonds, particularly in terms of anisotropy. A numerical model based on traction separation law was developed to fully incorporate interlayer and interstrip characteristics. The model was developed and validated based on the outcomes from experiments. The analysis considered the impact of extruder diameter, interlayer and interstrip bonding capacity, and width-to-thickness ratios on compressive strength. The findings indicate that the distortion occurred due to shear among the printed layers results in a decrease in strength for the 3D printed specimen when compression loading was applied. The samples under compression in Y and Z directions exhibit comparatively lower compressive strength. The numerical analysis indicates that the quantity of interlayers and interstrip and the shear characteristics play a role in the changes of anisotropy when specimens were loaded under compression. Furthermore, in order to improve the future simulation modeling of 3DPC, recommendations and factors contributing to anisotropic behavior have been proposed.