Date Approved
6-9-2025
Embargo Period
6-9-2027
Document Type
Thesis
Degree Name
M.S. Civil Engineering
Department
Civil Engineering
College
Henry M. Rowan College of Engineering
Advisor
Islam M. Mantawy, Ph.D.
Committee Member 1
Adriana C. Trias Blanco, Ph.D.
Committee Member 2
Stephen Mansour
Keywords
3D Concrete Printing;Additive Construction;Cementitious Materials;High-Strength Concrete;Sustainable Construction
Disciplines
Civil and Environmental Engineering | Civil Engineering | Engineering
Abstract
Additive Construction (AC), a layer-by-layer manufacturing method, is transforming the construction industry by enabling efficient material use, faster build times, and complex geometries. This thesis focused on developing high-strength concrete mixes using locally sourced materials in New Jersey, suitable for AC. The study investigated the influence of (1) material formulation, including raw ingredients, admixtures, and fiber reinforcement and (2) hardware parameters such as extrusion rates, printing speed, and nozzle sizes. Seventeen mortar-level mixes were initially assessed for flowability, setting time, and heat of hydration. A promising mix was selected and further evaluated with and without steel fibers (1% by volume, 4.5 mm and 6 mm lengths). Key printability factors such as extrudability, open time, buildability, and slope stability were examined. Mechanical properties such as compressive strength, modulus of rupture, and fracture energy were tested using samples from printed elements. The optimized mix demonstrated an initial setting time of 60 minutes, static flow of 100 mm, dynamic flow of 114 mm, and passed all printability tests with continuous, smooth extrusion. Notably, it showed slope stability up to 45° without fibers and up to 65° with fibers. The mechanical properties of the extracted samples showed variation between compressive strength in two different loading directions. This developed mix demonstrated high performance for both commercial and military AC applications.
Recommended Citation
Hanoun, Zaid, "ADDITIVE CONSTRUCTION OF FIBROUS AND NON-FIBROUS HIGH-STRENGTH CONCRETE" (2025). Theses and Dissertations. 3389.
https://rdw.rowan.edu/etd/3389
