Effect of Sand Size on Mechanical Performance of Cement-Based Composite Containing PVA Fibers and Nano-SiO2

Ling, Yifeng; Zhang, Peng; Wang, Juan; Shi, Yan

doi:10.3390/ma13020325

Cited by 20 publications

(17 citation statements)

References 39 publications

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“…The basic characteristic parameters of the sand and PVA fiber are shown in Table 2; the non-uniformity coefficient C u is greater than 5, and the curvature coefficient C c is between 1 and 3, indicating that the sand has good grain gradation. The EICP treatment solution consisted of 100 g/L soybean urease and CaCl 2 -urea mixture ([CaCl 2 :urea] = 2:3, [CaCl 2 ] = 1.0 M) [17,18]. The extraction of soybean urease [19] was as follows: the soybean was baked at 40 • C for 6 h and then crushed with a grinder and sifted through a 0.15 mm sieve.…”

Section: Methodsmentioning

confidence: 99%

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Effect of Incorporating Polyvinyl Alcohol Fiber on the Mechanical Properties of EICP-Treated Sand

et al. 2021

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Enzyme-induced calcium carbonate precipitation (EICP) technology can improve the strength of treated soil. But it also leads to remarkable brittleness of the soil. This study used polyvinyl alcohol (PVA) fiber combined with EICP to solidify sand. Through the unconfined compressive strength (UCS) test, the effect of PVA fiber incorporation on the mechanical properties of EICP-solidified sand was investigated; the distribution of CaCO3 in the sample and the microstructure of fiber-reinforced EICP-treated sand were explored through the calcium carbonate content (CCC) test and microscopic experiment. Compared with the sand treated by EICP, the strength and stiffness of the sand reinforced by the fiber combined with EICP were greatly improved, and the ductility was also improved to a certain extent. However, the increase of CCC was extremely weak, and the inhomogeneity of CaCO3 distribution was enlarged; the influence of fiber length on the UCS and CCC of the treated sand was greater than that of the fiber content. The improvement of EICP-solidified sand by PVA fiber was mainly due to the formation of a “fiber–CaCO3–sand” spatial structure system through fiber bridging, not the increase of CCC.

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Section: Methodsmentioning

confidence: 99%

“…The EICP treatment solution consisted of 100 g/L soybean urease and CaCl 2 –urea mixture ([CaCl 2 :urea] = 2:3, [CaCl 2 ] = 1.0 M) [ 17 , 18 ]. The extraction of soybean urease [ 19 ] was as follows: the soybean was baked at 40 °C for 6 h and then crushed with a grinder and sifted through a 0.15 mm sieve.…”

Section: Methodsmentioning

confidence: 99%

Effect of Incorporating Polyvinyl Alcohol Fiber on the Mechanical Properties of EICP-Treated Sand

et al. 2021

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“…While the substitution of both nanosilica and calcium carbonate nanoparticles increased the durability of PVA fiber reinforced cementitious composites, they also decreased flowability (40). Further experimental investigations also showed that the mechanical properties like compressive, flexural, and tensile strength and fracture toughness in cementitious composites having PVA fibers and nanosilica changed due to particle size (41).…”

Section: Introductionmentioning

confidence: 92%

Application of novel synthesized nanocomposites containing κ-carrageenan/PVA/eggshell in cement mortars

et al. 2020

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This study is a preliminary attempt to present the preparation and the first time a κ-carrageenan/PVA/eggshell nanostructure is used as a novel biodegradable and homogeneous nanostructure in cement composition. In order to clearly understand the effects these additives have on the mechanical properties of cementitious composites, they were synthesized in double and triple combinations and added into mortar mixtures. Three different cement mortar specimens were prepared by integrating the additives in ratios of 0, 0.1, 0.5 and 1% by cement weight and flexural and compressive strengths of the specimens were determined at the ages of 7 and 28 days. The flowability of the presented nanostructures was also discussed. The results revealed a 10–11% increase in both compressive and flexural strengths for the specimens prepared with the triple combination of the proposed additives. Moreover, strain capacity was enhanced as a result of the efficient dispersion of additives in the cement matrix.

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“…The granular nature of sand, its recycling capability combined with its complex interaction dynamics creates unique physical capabilities. The mixture of sand with other construction materials for example, creates important characteristics suitable for several mechanical and construction applications [ 9 , 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 ]. This phenomenon has been studied here as an alternative to achieve the goal of bullet fragmentation.…”

Section: Introductionmentioning

confidence: 99%

Simulation of Bullet Fragmentation and Penetration in Granular Media

et al. 2020

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The aim of this work is to simulate the fragmentation of bullets impacted through granular media, in this case, sand. In order to validate the simulation, a group of experiments were conducted with the sand contained in two different box prototypes. The walls of the first box were constructed with fiberglass and the second with plywood. The prototypes were subjected to the impact force of bullets fired 15 m away from the box. After the shots, X-ray photographs were taken to observe the penetration depth. Transient numerical analyses were conducted to simulate these physical phenomena by using the smooth particle hydrodynamics (SPH) module of ANSYS® 2019 AUTODYN software. Advantageously, this module considers the granular media as a group of uniform particles capable of transferring kinetic energy during the elastic collision component of an impact. The experimental results demonstrated a reduction in the maximum bullet kinetic energy of 2750 J to 100 J in 0.8 ms. The numerical results compared with the X-ray photographs showed similar results demonstrating the capability of sand to dissipate kinetic energy and the fragmentation of the bullet caused at the moment of impact.

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Effect of Sand Size on Mechanical Performance of Cement-Based Composite Containing PVA Fibers and Nano-SiO2

Cited by 20 publications

References 39 publications

Effect of Incorporating Polyvinyl Alcohol Fiber on the Mechanical Properties of EICP-Treated Sand

Effect of Incorporating Polyvinyl Alcohol Fiber on the Mechanical Properties of EICP-Treated Sand

Application of novel synthesized nanocomposites containing κ-carrageenan/PVA/eggshell in cement mortars

Simulation of Bullet Fragmentation and Penetration in Granular Media

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