scholarly journals Prefabricated and Self-Setting Cement Laminates

Materials ◽  
2019 ◽  
Vol 12 (5) ◽  
pp. 834 ◽  
Author(s):  
Theresa Brückner ◽  
Andreas Fuchs ◽  
Laura Wistlich ◽  
Andreas Hoess ◽  
Berthold Nies ◽  
...  
Keyword(s):  
Fracture Energy ◽  
Volume Content ◽  
Bending Strength ◽  
Cement Matrix ◽  
Fiber Volume ◽  
Mechanical Reinforcement ◽  
Fiber Mats ◽  
Solution Electrospinning ◽  
Design Options ◽  
High Degree

Polycaprolactone (PCL) fiber mats with defined pore architecture were shown to provide sufficient support for a premixed calcium phosphate cement (CPC) paste to serve as a flat and flexible composite material for the potential application in 2-dimensional, curved cranial defects. Fiber mats were fabricated by either melt electrospinning writing (MEW) or solution electrospinning (SES) with a patterned collector. While MEW processed fiber mats led to a deterioration of the cement bending strength by approximately 50%, due to a low fiber volume content in conjunction with a weak fiber-matrix interface, fiber mats obtained by solution electrospinning resulted in a mechanical reinforcement of the cement matrix in terms of both bending strength and absorbed fracture energy. This was attributed to a higher fiber volume content and a large contact area between nanosized fibers and cement matrix. Hydrophilization of the PCL scaffolds prior to lamination further improved composite strength and preserved the comparably higher fracture energy of 1.5 to 2.0 mJ/mm2. The laminate composite approach from this study was successful in demonstrating the limitations and design options of such novel composite materials. However, fiber-cement compatibility remains an issue to be addressed, since a high degree of hydrophilicity does not necessarily provoke a stronger interface.

Mechanical Property of Hybrid Steel Fiber Reinforced Cement-Based Composites

2013 ◽  
Vol 539 ◽  
pp. 99-102
Author(s):  
Hai Tao Tan ◽  
Wu Yao ◽  
Xiao Ming Song ◽  
Shuai Dong
Keyword(s):  
Mechanical Property ◽  
Fracture Energy ◽  
Fiber Volume Fraction ◽  
Ultimate Load ◽  
Bending Strength ◽  
Steel Fiber ◽  
Volume Fraction ◽  
Fiber Reinforced ◽  
Fiber Volume ◽  
Reinforced Cement

The ultimate load, fracture energy and equivalent bending strength of hybrid steel fiber reinforced mortar were investigated with a constant fiber volume fraction in this paper. The results showed that ultimate load of hybrid steel-fiber reinforced mortar was higher than that of mono-fiber reinforced mortar; fracture energy and equivalent bending strength increased with the volume fraction of steel fiber with end hooks.

The Mechanical Behavior of Reactive Powder Concrete with Different Steel Fiber Volume Contents

2014 ◽  
Vol 1065-1069 ◽  
pp. 1964-1968
Author(s):  
Xiao Fei Wang ◽  
Li Cheng Wu ◽  
Yang Ping Wang
Keyword(s):  
Compressive Strength ◽  
Volume Content ◽  
Bending Strength ◽  
Steel Fiber ◽  
Bending Test ◽  
Reactive Powder Concrete ◽  
Uniaxial Compression Test ◽  
Fiber Volume ◽  
Splitting Test ◽  
Reactive Powder

Through uniaxial compression test, tensile splitting test and bending test, we have researched the three kinds basic mechanical behaviors of Reactive Powder Concrete (RPC for short) with different steel fiber volume contents at 0%, 1%, 2% and 4% respectively. According to the result, the tensile splitting strength is a linear increase nearly with the increase of steel fiber volume content; and the bending strength is also increase with the increase of steel fiber volume content, When steel fiber volume content increases from 1% to 2%, the growing rate of bending strength reaches to maximum. When steel fiber volume content is within 4%, the compressive strength increases with the increase of steel fiber volume content. The compressive strength of plain RPC can reach to 135MPa, and the RPC with 4% steel fiber volume content is about 220MPa. This information can tell us that the addition of steel fiber in RPC can get an great increase of strength and toughness.

scholarly journals Fabrication and Characterization of Lignin/Dendrimer Electrospun Blended Fiber Mats

Molecules ◽  
2021 ◽  
Vol 26 (3) ◽  
pp. 518
Author(s):  
Somaye Akbari ◽  
Addie Bahi ◽  
Ali Farahani ◽  
Abbas S. Milani ◽  
Frank Ko
Keyword(s):  
Thermal Characteristics ◽  
Dendritic Polymers ◽  
Amino Groups ◽  
Fiber Mats ◽  
Potential Applications ◽  
Solution Electrospinning ◽  
Nanofiber Mats ◽  
Softwood Kraft Lignin ◽  
First Time

Blending lignin as the second most abundant polymer in Nature with nanostructured compounds such as dendritic polymers can not only add value to lignin, but also increase its application in various fields. In this study, softwood Kraft lignin/polyamidoamine dendritic polymer (PAMAM) blends were fabricated by the solution electrospinning to produce bead-free nanofiber mats for the first time. The mats were characterized through scanning electron microscopy, Fourier transform infrared (FTIR) spectroscopy, zeta potential, and thermogravimetry analyses. The chemical intermolecular interactions between the lignin functional groups and abundant amino groups in the PAMAM were verified by FTIR and viscosity measurements. These interactions proved to enhance the mechanical and thermal characteristics of the lignin/PAMAM mats, suggesting their potential applications e.g. in membranes, filtration, controlled release drug delivery, among others.

Dynamic Load Effects of PVA Tail Sand Cement Base Composite Materials

2014 ◽  
Vol 518 ◽  
pp. 66-70 ◽  
Author(s):  
Wen Bo Bao ◽  
Shao Feng Zhang ◽  
Gao Hao Di ◽  
Wei Wei Ji ◽  
Li Hui Qu
Keyword(s):  
Composite Materials ◽  
Volume Content ◽  
Dynamic Load ◽  
Plate Thickness ◽  
Replacement Rate ◽  
Fiber Volume ◽  
Mechanics Performance ◽  
Load Effects ◽  
Base Composite ◽  
Pva Fiber

This paper studies that dynamic load affects mechanical properties of materials about composite tail ore different replacement rate, different PVA fiber volume content and different plate thickness. The phenomenon of the tests and results showed that:1) PVA tailings cement-based composite materials has low damage, strong integrity and strong energy dissipation under dynamic loading. 2) When the volume content is 2%, material resistance effect is best. 3) The study proves that 30 mm plate have good ductility and Size effect influence the material mechanics performance. 4) PVA tailings cement-based composite materials under dynamic loads ,as tailings content increases the performance indicators reduced. So the engineering applications recommended replacement rate of the tailings is 50%.

scholarly journals Influence of the Fiber Volume Content on the Durability-Related Properties of Polypropylene-Fiber-Reinforced Concrete

2020 ◽  
Vol 12 (2) ◽  
pp. 549
Author(s):  
Chenfei Wang ◽  
Zixiong Guo ◽  
Ditao Niu
Keyword(s):  
Reinforced Concrete ◽  
Flexural Strength ◽  
Volume Content ◽  
Polypropylene Fiber ◽  
Fiber Reinforced Concrete ◽  
Fiber Reinforced ◽  
Fiber Volume ◽  
Freeze Thaw ◽  
Chloride Environment ◽  
Polypropylene Fiber Reinforced Concrete

Polypropylene-fiber-reinforced concrete impacts the early shrinkage during the plastic stage of concrete, and the fiber volume content influences the durability-related properties of concrete. The purpose of this paper was to investigate the influence of fiber volume content on the mechanical properties, durability, and chloride ion penetration of polypropylene-fiber-reinforced concrete in a chloride environment. Tests were carried out on cubes and cylinders of polypropylene-fiber-reinforced concrete with polypropylene fiber contents ranging from 0% to 0.5%. Extensive data from flexural strength testing, dry–wet testing, deicer frost testing, and chloride penetration testing were recorded and analyzed. The test results show that the addition of the fiber improves the failure form of the concrete specimens, and 0.1% fiber content maximizes the compactness of the concrete. The flexural strength of specimen C2 with 0.1% fiber shows the highest strength obtained herein after freeze–thaw cycling, and the water absorption of specimen C2 is also the lowest after dry–wet cycling. The results also indicate that increasing the fiber volume content improves the freeze–thaw resistance of the concrete in a chloride environment. Chlorine ions migrate with the moisture during dry–wet and freeze–thaw cycling. The chlorine ion diffusion coefficient (Dcl) increases with increasing fiber content, except for that of specimen C2 in a chloride environment. The Dcl during freeze–thaw cycling is much higher than that during dry–wet cycling.

scholarly journals Fracture Properties and Softening Curves of Steel Fiber-Reinforced Slag-Based Geopolymer Mortar and Concrete

Materials ◽  
2018 ◽  
Vol 11 (8) ◽  
pp. 1445 ◽  
Author(s):  
Yao Ding ◽  
Yu-Lei Bai
Keyword(s):  
Fracture Toughness ◽  
Fracture Energy ◽  
Inverse Analysis ◽  
Steel Fiber ◽  
Mouth Opening ◽  
Crack Mouth Opening Displacement ◽  
Fiber Reinforced ◽  
Fiber Volume ◽  
Opening Displacement ◽  
Fracture Properties

Adding short steel fibers into slag-based geopolymer mortar and concrete is an effective method to enhance their mechanical properties. The fracture properties of steel fiber-reinforced slag-based geopolymer concrete/mortar (SGC/SGM) and unreinforced control samples were compared through three-point bending (TPB) tests. The influences of steel fiber volume contents (1.0%, 1.5% and 2.0%) on the fracture properties of SGC and SGM were studied. Load-midspan deflection (P-δ) curves and load-crack mouth opening displacement (P-CMOD) curves of the tested beams were recorded. The compressive and splitting tensile strengths were also tested. The fracture energy, flexural strength parameters, and fracture toughness of steel fiber-reinforced SGC and SGM were calculated and analyzed. The softening curves of steel fiber-reinforced SGC and SGM were determined using inverse analysis. The experimental results show that the splitting tensile strength, fracture energy, and fracture toughness are significantly enhanced with fiber incorporation. A strong correlation between the equivalent and residual flexural strengths is also observed. In addition, the trilinear strain-softening curves obtained by inverse analysis predict well of the load-displacement curves recorded from TPB tests.

Design and Optimization of Biopolyester Bagasse Fiber Composites

2007 ◽  
Vol 1 (1) ◽  
pp. 46-55 ◽  
Author(s):  
Alma Hodzic ◽  
Richard Coakley ◽  
Ray Curro ◽  
Christopher C. Berndt ◽  
Robert A. Shanks
Keyword(s):  
Stress Transfer ◽  
Soxhlet Extraction ◽  
Interfacial Stress ◽  
Fiber Volume ◽  
Mechanical Reinforcement ◽  
Xylem Structure ◽  
Design And Optimization ◽  
The Matrix ◽  
Packaging Industry ◽  
Bagasse Fiber

Bagasse fiber, a by-product of the sugar making process, maintains a coherent xylem structure and can offer mechanical reinforcement to composite materials. Biopolyester bagasse composites were prepared with biodegradable matrices polyhydroxylbutyrate (PHB) and its copolymer containing polyhydroxyvalerate (PHBV). Both biopolymers were reinforced with treated and untreated bagasse fibers, as well as fiber volume fractions involving two fiber lengths. Optimized properties were achieved with PHB-bagasse composite surpassing the PHB flexural strength by 50% and achieving higher strength and modulus than the standard thermoplastics. The bagasse fibers were cleaned with boiling water and acetone soxhlet extraction to avoid using adhesive chemicals and, therefore, comply with biosafety standards in the packaging industry. A significant improvement in the interfacial stress transfer between the fiber and the matrix was achieved with the fibers subjected to both washing and acetone treatment. While the crystallization of PHBV was shown to be controllable by processing conditions, it was concluded that no transcrystalline region was formed with this particular resin in any of the composites. Bagasse was shown to be an effective filler for PHBV; although the results varied somewhat due to the surface treatment of the bagasse fibers. On average, long fiber bagasse composites displayed flexural moduli 33% higher than those of PHBV. Overall, the results demonstrated the positive potential of bagasse to reinforce both biopolyester matrices.

Toughness of ECC Evaluated by Nominal Fracture Energy

2012 ◽  
Vol 238 ◽  
pp. 57-60 ◽  
Author(s):  
Shu Ling Gao ◽  
Wei Shao ◽  
Jin Li Qiao ◽  
Ling Wang
Keyword(s):  
Glass Fiber ◽  
Fracture Energy ◽  
Steel Fiber ◽  
Volume Ratio ◽  
Fiber Glass ◽  
Fiber Volume ◽  
High Durability ◽  
The Matrix ◽  
Pva Fiber ◽  
Very High

ECC (Engineered Cementitious Composites) has ultra-high toughness and can be used in the zone needing the ultra-high tensile strain and very high durability. In order to investigate the toughness of ECC, the normal fracture energy GFis calculated and compared with ordinary concrete. The influence of the matrix (fly ash, silicon fume), the fiber (glass fiber, steel fiber and PVA fiber) and the fiber volume ratio on the GFof ECC are analyzed. The research indicates that silicon fume and glass fiber, steel fiber are all not able to be used in ECC. But flash ash and PVA fiber are very suit for using in ECC, the toughness of ECC increases with the increase of their content.

Fabrication of Porous Transpiration C/SiC Composites

2008 ◽  
Vol 368-372 ◽  
pp. 1053-1055
Author(s):  
Hong Liang Ji ◽  
Chang Rui Zhang ◽  
Xin Gui Zhou ◽  
Ying Bin Cao
Keyword(s):  
Pore Structure ◽  
Glass Fiber ◽  
Volume Content ◽  
Bending Strength ◽  
New Technology ◽  
Transpiration Cooling ◽  
Sic Composites

A new technology, prefabricating pore media (PPM) technology that adopt glass fiber as pore media, for porous transpiration cooling C/SiC composites was studied. The result shows that the technology can control the pore structure successfully by the volume content and distribution of glass fiber in the braid, and the porous C/SiC composites have good bending strength above 300MPa.

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