Effect of admixtures and PVA fiber on the mechanical properties of high strength cementitious grout

Experimental and simulation study on seismic performance of steel‐PVA hybrid fiber cementitious composites‐encased CFST

“…24 Hybrid fiber cementitious composites (HFC) have unique mechanical properties and a variety of fiber materials to choose from, which can effectively improve such problems. 25,26 ManjushaK et al 27 used FEA to study the mechanical behavior of engineered cementitious composites (ECC)-encased CFST columns under different eccentric loads, and the study showed that ECC-encased CFST columns had good performance. Chu 28 conducted axial load tests on CFST columns composed of ultra-high performance concrete, ECC, lightweight concrete (LWC), and clastic rubber concrete (CRC).…”

“…Specifically, the outer concrete is prone to cracking during normal use, while the CFST column as the skeleton is still in the elastic stage, which leads to the corrosion of CFST 24 . Hybrid fiber cementitious composites (HFC) have unique mechanical properties and a variety of fiber materials to choose from, which can effectively improve such problems 25,26 . ManjushaK et al 27 used FEA to study the mechanical behavior of engineered cementitious composites (ECC)‐encased CFST columns under different eccentric loads, and the study showed that ECC‐encased CFST columns had good performance.…”

Effect of fiber content on mechanical parameters and crack development of two kinds of reinforced cement soil

“…Adding fibers to the cement soil material is a simple and efficient method to improve the strength, and a large number of scholars have done research on the various strengths of fibrous cement soils (Thanushan and Sathiparan 2022, Li et al 2022a, Yang et al 2023a, PVA and basalt fiber are widely used in the reinforcement process of cement soil materials as common fiber. PVA fiber is a kind of super-extension material.…”

“…PVA fiber is a kind of super-extension material. The fracture elongation of qualified PVA fiber can reach 6.9%, thus avoiding the destruction of cementitious materials in the process of damage only through a crack, but first formed numerous micro-cracks, and finally the overall damage occurred (Li and Leung 1992), Li et al (2022b) found that PVA fiber can be combined with hydration products to improve the crack resistance of cement soil materials and enhance the durability of materials, Mercuri et al (2023) added PVA fibers with different contents and lengths to mortar, and obtained the change rule of compressive strength of mortar material with fiber, and fitted the formula by linear regression, Yang et al (2023b) added PVA fibers and expanders to cement grout and found that it improved the mechanical properties and prevented brittle damage, but reduced the thermal aging bond strength of the grout, Yao et al (2021) found that the addition of PVA fibers can improve the compressive strength, flexural strength and tensile strength of the cement soil, and can effectively reduce the width of cracks, however, when the content of fiber is more than 1%, fiber aggregation will occur inside the specimen, which will affect the improvement of strength. Mei et al (2022) found through experiments that adding 0.1% 6 mm PVA fibers to cement soil can improve the static strength best, and adding 0.3% 12 mm PVA fibers can improve the dynamic strength best.…”