An Indirect Methodology to Evaluate the Rheological Properties of a Digitally Fabricated Concrete Incorporating Corrosion Inhibitors (2024-11)¶

3D-printed concrete is a groundbreaking innovation in construction, aiming to reduce environmental impact and speed up building processes. While current research is primarily focusing on material properties and their adaptability to the printing process, it is imperative to also consider the structural implications, particularly in challenging environment. Diverging from traditional concrete construction methods that involve formwork, compaction, and curing, 3D-printed concrete introduces a paradigm shift characterized by increased overall porosity and reduced reinforcement cover thickness. Although these distinctive features expedite the construction phase, there are concerns about the potential acceleration of corrosion in steel reinforcements. To enhance the durability of 3D-printed concrete, there is consideration for directly integrating corrosion inhibitors into the “ink” mixture. However, this proposition requires meticulous evaluation of the admixture dosage, since an imbalanced formulation could alter the specific characteristics of the initial mix, potentially compromising the material’s printability. Predicting how rheological parameters will respond to selected materials and dosages poses a significant challenge. The work starts with an experimental preliminary characterization of rheological properties (via a flow table test) of 3D-printable mixes, sourced from existing literature, and incorporates the effects of corrosion inhibitors. This methodology is proposed as an alternative to using a rheometer, simplifying the entire procedure and facilitating streamlined on-site evaluations of material characteristics. Through this comprehensive analysis, the objective is not only to leverage the advantages of this cutting-edge technology but also to address potential challenges, paving the way for a more sustainable and efficient future in the construction industry.