Study and data-driven modeling of flexural behaviors of ultra-high-performance concrete reinforced by milling steel fiber
Yibo Yang, Baixi Chen, Yinggan Xia, Shaokun Liu, Qifeng Xiao, Wenying Guo, Hengchang Wang
Abstract
This study leveraged milling steel fibers to enhance the flexural capacity of ultra-high-performance concrete (UHPC). We assessed UHPC's flexural performance, measuring compressive strength and flowability, considering three fiber types: milling, straight, and a hybrid. UHPC with milling fibers displayed superior compressive strength and flowability compared to straight fiber. Milling fibers consistently enhanced UHPC’s flexural capacity by over 120%, with a flowability reduction below 15%. Hybrid fiber demonstrated a balanced and commendable performance. Data-driven and theoretical flexural models were developed for UHPC with both fibers. the Gaussian process regression data-driven model outperformed the other 18 models, with an error below 3.5%.