Dynamic Compressive and Tensile Characteristics of a New Type of Ultra‐High‐Molecular Weight Polyethylene (UHMWPE) and Polyvinyl Alcohol (PVA) Fibers Reinforced Concrete

Abstract

The dynamic mechanical properties of concrete materials are important parameters for evaluating the safety performance of concrete structures under dynamic loads. Fiber cement-based materials have been widely used in the construction projects due to their strength, toughening, and cracking resistance. In this study, we conducted experimental and theoretical studies on dynamic compression and tensile mechanical properties of different proportions of new-type fiber concrete. A Split-Hopkinson pressure bar equipment was used to determine the concrete behavior at different strain rates. The effects of strain rate and fiber content on the strength of the specimen, dynamic increase factor, and ultimate strain were analyzed. Based on the macrodamage factor, the traditional nonlinear viscoelastic constitutive model was simplified and improved. The four-parameter constitutive model was obtained, and the influence of these parameters on the performance of fiber concrete was analyzed. The experimental results were compared with those predicted from the available equations, and results were in accordance. Finally, an analytical equation for predicting the dynamic compression and tensile properties of these new-type fibers was proposed.

Effectiveness of multiscale hybrid fiber reinforced cementitious composites under single degree of freedom hydraulic shaking table

“…Nowadays, cementitious composites are extensively used in civil engineering construction due to its better cracking resistance, durability, toughening, and strength 1,2 . Also, the addition of fibers into cementitious composites can further improve the flexural strength, toughness, energy absorption, resistance to impact, durability, shear, tensile, and compressive strengths 3–10 .…”

“…Fiber reinforced cementitious composite (FRCC) had been developed to control the brittleness of cement‐based composites and improves the resistance against cracking 1,11 . Dynamic properties of composite materials are important in order to evaluate the safety performance of composite structures 2 . FRCC had a great advantage in earthquake‐resistant structures than that of plain composite 12 .…”

The Effect of Concrete Footing Shape in Differential Settlement: A Seismic Design

“…e results of the numerical analysis show good agreements with those reported in the literature. e different types of loads can store elastic energy before damage, and this energy storage accelerates and develops damage mechanism [25][26][27][28][29][30][31][32][33]. In the present numerical analysis, it has been observed that the shape of +5.442e + 00 +4.535e + 00 +3.628e + 00 +2.721e + 00 +1.814e + 00 +9.070e -01 +3.576e -07 -9.070e -01 -1.814e + 00 -2.721e + 00 -3.628e + 00 -4.535e + 00 -5.442e + 00 (a) +5.380e + 00 +4.483e + 00 +3.586e + 00 +2.690e + 00 +1.793e + 00 +8.966e -01 +1.192e -07 -8.966e -01 -1.793e + 00 -2.690e + 00 -3.586e + 00 -4.483e + 00 -5.380e + 00 +5.442e + 00 +4.535e + 00 +3.628e + 00 +2.721e + 00 +1.814e + 00 +9.070e -01 +3.576e -07 -9.070e -01 -1.814e + 00 -2.721e + 00 -3.628e + 00 -4.535e + 00 -5.442e + 00 +5.380e + 00 +4.483e + 00 +3.586e + 00 +2.690e + 00 +1.793e + 00 +8.966e -01 +1.192e -07 -8.966e -01 -1.793e + 00 -2.690e + 00 -3.586e + 00 -4.483e + 00 -5.380e + 00…”

Effect of elevated temperature on axially and eccentrically loaded columns containing Polyvinyl Alcohol (PVA) fibers

“…With the same cracking mechanism, PVA member cracking can reach a saturated state with small crack spacing, until localization of a random single crack occurs. Osman et al (2019) noted that there is a bridging effect of fiber which inhibit the expansion of cracks during testing and restrain the crack width. Furthermore, it can enhance the lateral restraint performance of concrete when it is damaged.…”

“…It was observed also that no signs of spalling appeared on columns containing PVA fibers. This may be attributed to the fiber bridging effect, or in other words, when concrete exposed to high temperature, the PVA fibers melts creating paths to escape water vapor, which was captured in pore structure of concrete, in order to give concrete room to breathe, to prevent explosions and, in turn, to increase its resistance (Osman et al, 2019). Cao et al (2019) also observed no spalling in samples with PVA exposed to elevated temperature.…”