Recent research led by Xueliang Jiang from Guangzhou Maritime University and Central South University of Forestry and Technology has unveiled promising advancements in the use of enzyme-induced carbonate precipitation (EICP) technology to enhance the properties of calcareous sand. Published in the journal “Results in Engineering,” this study dives into how EICP can be paired with coir fiber to bolster the mechanical stability of calcareous sand, a material often found in coastal and marine environments.
Calcareous sand, while abundant, presents challenges in construction and engineering due to its inherent brittleness. Jiang’s team conducted a series of consolidated drained triaxial compression tests to assess the performance of EICP-cemented calcareous sand (referred to as EICP-S) and a hybrid version reinforced with coir fiber (EICP-FS). The results were quite telling. They observed that as the number of grouting operations increased or confining pressures were raised, the peak deviatoric stress—the measure of the material’s strength—improved significantly.
One of the standout findings was the enhanced performance of EICP-FS specimens, which exhibited a higher strain at failure and a more gradual reduction in strength after peak stress. This suggests that incorporating coir fiber can provide additional resilience, particularly at lower levels of cementation. Jiang noted, “At low cementation levels, coir fiber can effectively enhance the peak deviatoric stress of the samples.” However, the study also cautioned that this benefit wanes as cementation levels rise, indicating a need for careful consideration in application.
For the maritime sector, these findings are particularly relevant. The ability to improve the structural integrity of calcareous sand could have significant implications for coastal construction, such as port facilities, breakwaters, and other marine infrastructure. As coastal areas face increasing challenges from erosion and climate change, utilizing EICP technology could offer a sustainable solution to reinforce these vulnerable structures.
Moreover, the research introduces a brittleness evaluation index (BEICP) tailored for cemented calcareous sand, which can serve as a crucial tool for engineers assessing material performance in various conditions. Jiang emphasized that “the brittleness evaluation index constructed based on parameters like failure strain and peak deviatoric stress can effectively evaluate its brittleness properties.” This could lead to more informed decision-making in engineering projects, ultimately enhancing safety and longevity.
As the maritime industry continues to seek innovative materials and methods to combat environmental challenges, the insights from Jiang’s research present a unique opportunity. The combination of EICP technology and natural fibers like coir not only aligns with sustainable practices but also opens doors for new applications in coastal engineering. The potential for improved material performance could lead to safer, more resilient infrastructures that stand the test of time.
In summary, the work of Jiang and his team sheds light on a promising avenue for enhancing calcareous sand through EICP and coir fiber, offering valuable insights for maritime professionals. With the ongoing pressures of climate change and the need for sustainable solutions, this research holds significant commercial potential for the industry, paving the way for innovative engineering practices in coastal environments.
