|
Abstract
|
The construction materials sector is expected to double its greenhouse gas emissions by 2060, making it critical to promote low-carbon alternatives or adapt existing materials with greener options. Plant fibers offer an opportunity to decarbonize conventional materials and shift the industry toward sustainability. Incorporating them into brittle cementitious matrices, such as OPC or alkali-activated binders like geopolymers, can increase their toughness, post-cracking behavior, and control the development of cracks caused by shrinkage. Nonetheless, the widespread use of plant fibers faces significant challenges. First, their hydrophilic nature can weaken the interface between the fiber and the matrix, essential for them to act as reinforcement rather than mere fillers. Second, their natural origin introduces variability in their chemical, physical and mechanical properties. Third, their durability can be compromised by the alkaline environment in cementitious materials, leading to degradation of the reinforcement. This study outlines the main challenges associated with the large-scale use of plant fibers as reinforcement for cementitious matrices. Methods to reduce their hydrophilicity and their alkalinity and mineralization, potentially enhancing their durability, have been reported. Nevertheless, further research is necessary to understand their long-term performance before gaining acceptance in the traditional construction industry.
|