Influence of Biobased Stabilizers on Earth-Based Materials in the Context of Digital Fabrication

Abstract

The construction industry significantly contributes to global CO2 emissions, largely due to concrete usage. This study explores biobased stabilizers, Xanthan Gum (XG) and Corn Starch (CS), to enhance earth-based materials for digital fabrication, offering a sustainable alternative. Materials tested included Kaolin clay, silt, sludge, sand, lime, XG, and CS. Key findings revealed that Lime + XG mixes exhibited superior yield stress and reduced cracking, highlighting the efficacy of lime in enhancing structural integrity. XG-only samples showed high compressive strength but increased shrinkage, necessitating further optimization. Cracking tests indicated some Lime + XG mixes did not crack, suggesting potential areas for improvement. The TOC test confirmed high adsorption of XG with lime, suggesting strong cationic bridging. These results underscore the potential of XG in improving earth-based materials’ stability and mechanical properties, making them suitable for digital fabrication. Future research should explore higher CS concentrations and different clay types to further optimize mix designs, aiming for enhanced performance in sustainable construction.