An Innovative Experimental Approach to Assess Binder–Plant Particle Compatibility in Plant-Based Concrete
Résumé
The excellent insulation properties and low carbon footprint of plant-based concretes make them increasingly popular in construction. To produce optimized building materials, it is crucial to better understand the interfacial transition zone (ITZ) between plant particles and cement paste, focusing on the reactions involved and the size of the affected surface. This research established a reliable visual test to observe the ITZ, allowing for the monitoring of its formation and development. Various combinations of plant particles and cement pastes were tested to compare the ITZ formation, including hemp and bamboo with Portland, Prompt, calcined clay limestone, and pozzolanic cements. A clear correlation was found between sugar concentration and ITZ size. Image analysis revealed that the ITZ results from physicochemical reactions, involving the extraction of free saccharide molecules from the plant particles and water absorption, followed by their release into the cement paste.