scholarly journals Application of Glass Fiber Concrete under Thin-Walled Middle Partition Wall Construction in Tunnel

2021 ◽  
Vol 769 (3) ◽  
pp. 032079
Author(s):  
Yuanyuan Tian ◽  
Yigong Wang ◽  
Haixiang Nie ◽  
Hongyue You ◽  
Junjie Zhang ◽  
...  
Keyword(s):  
Glass Fiber ◽  
Partition Wall ◽  
Fiber Concrete ◽  
Thin Walled ◽  
Wall Construction

scholarly journals GLASS FIBER REINFORCED CONCRETE IN THIN-WALLED CONSTRUCTIONS

2019 ◽  
Vol 4 (4) ◽  
pp. 70-76
Author(s):  
Л. Панченко ◽  
Larisa Panchenko ◽  
Е. Ерижокова ◽  
E. Erizhokova
Keyword(s):  
Glass Fiber ◽  
Yield Criterion ◽  
Variable Parameter ◽  
Isoperimetric Problem ◽  
Fiber Reinforced Concrete ◽  
Rectangular Plates ◽  
Thin Walled Structures ◽  
Fiber Concrete ◽  
Thin Walled ◽  
Von Mises

Fibrous composites are progressive materials for buildings and structures. Structures based on them are characterized by high technical and economic characteristics. Glass fiber concrete is effective for thin-walled structures. Various principles of structural mechanics applied to fiber composites are pro-posed for solving design problems. The optimal configuration of the covering is determined by the sta-tionarity of its potential energy for given values of the calculated resistances of the material compo-nents. This formulation of the problem leads to a global minimum of the covering volume. In particu-lar, an axisymmetrically loaded spherical cover is considered; the optimal thickness is determined from the condition of equal resistance by the von Mises yield criterion. Types of elements for precast glass-fiber concrete of various spans are recommended. In addition, the shallow tunnels are consid-ered; they are a prevalent object of transport communications. The rationality of using the thin-walled spatial systems consisting of rectangular plates is established. The isoperimetric problem is solved for a given volume of material based on the generalized Lagrangian principles. The thickness of the rec-tangular plates of the spatial system of the tunnel is taken as a variable parameter.

scholarly journals Effects of Incorporating Fiber Cocktail on Mechanical Properties of Concrete

2018 ◽  
Vol 203 ◽  
pp. 06011
Author(s):  
Saeed Ahmad ◽  
Ayub Elahi ◽  
Hafiz Waheed Iqbal ◽  
Faiza Mehmood
Keyword(s):  
Mechanical Properties ◽  
Glass Fiber ◽  
Steel Fiber ◽  
Research Work ◽  
Polypropylene Fiber ◽  
Point Load ◽  
Strength Test ◽  
Load Test ◽  
Compressive Strength Test ◽  
Fiber Concrete

The objective of this research work was to determine the effect of fiber cocktail on mechanical properties of concrete. Three types of fibers were used namely monofilament polypropylene fiber, steel fiber and glass fiber. Steel and glass fiber were incorporated in concrete at different dosages while the content of Polypropylene fiber was kept constant. For this purpose, cubes (150×150×150mm) and prisms (101×101×508mm) were casted for compressive strength test on cubes and Two-Point load test on prisms. Eighteen different mixes were prepared such as control mix, single fiber concrete, double hybrid concrete and triple hybrid concrete. It was observed that both compressive and flexural strength increased with addition of single, double and triple fibers. However, the strengths of triple hybrid concrete were observed to be lesser as compared to single and double hybrid concrete.

scholarly journals Mechanical Properties of Glass Fiber Concrete with Different Dosages of Glass Fiber

2020 ◽  
Vol 8 (5) ◽  
pp. 3916-3919
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Flexural Strength ◽  
Glass Fiber ◽  
Glass Fibers ◽  
High Dispersion ◽  
Conventional Concrete ◽  
Micro Cracks ◽  
Deformation Properties ◽  
Fiber Concrete

Conventional concrete i.e. the concrete generally has low tensile strength with limited ductility and low resistance towards cracking. The micro cracks that are developed internally are inherent among concrete and can be explained with the help of propagation of that micro cracks due to its inferior tensile strength. Different fibers, added at a certain percentage of concrete known to improve the deformation properties of concrete along with the plasticity against crack resistance, such as flexural strength. Mainly concrete & ferroconcrete research has been moved to steel fibers, and glass fibers have recently become more available, with no corrosion problems associated with glass fibers. This article describes an experimental study of the usage of glass fibers in the structural concrete. High-dispersion CEM-FILL fiberglass of 14 μm diameter with an aspect ratio of 857 was used at a dosage of 0.33% to 1% by weight in concrete and its mechanical properties such as compressive strength, flexural strength and modulus of elasticity.

scholarly journals Mechanical and Parametric Analysis of Cracks in Polypropylene Fiber Concrete U-Shaped Girder

2017 ◽  
Vol 2017 ◽  
pp. 1-10
Author(s):  
Xu Dong ◽  
Shuchen Li ◽  
Zhenquan Deng ◽  
Jian Guo ◽  
Haican Zhou
Keyword(s):  
Finite Element ◽  
Polypropylene Fiber ◽  
Urban Rail Transit ◽  
Nonlinear Material ◽  
Design Parameters ◽  
Slab Thickness ◽  
Fe Method ◽  
Fiber Concrete ◽  
Thin Walled ◽  
The Web

The U-shaped girder is a type of open thin-walled structure, which is used in urban rail transit engineering. Although it employs polypropylene fiber concrete to avoid cracks, the girder is still easier to crack than other traditional structures owing to its special open thin-walled cross section. In this study, a cracking accident of a U-shaped girder, which happened during the prestressed steel tensioning, was studied by field investigation and mechanical analysis through the finite element (FE) method. An outline of the cracks was presented. The nonlinear material properties of the polypropylene fiber concrete and steel were discussed and used in the finite element model. The effects of the main design parameters, such as the flange slab thickness, anchorage position, and prestressed steel layout, were evaluated based on the results of the FE analysis. The results indicate that the extremely low rigidity of the web and oversize of the web longitudinal prestressed steels are the main reasons for the cracks. The risk of cracks can be reduced by increasing the thickness of the flange slab and changing the anchorage position and prestressed steel layout. Some suggestions are provided for avoiding cracks based on the results of the research.

Anisotropy Study of a Constrained Thin Walled Component Using a Range of Processing Control Factors

2007 ◽  
Author(s):  
Steven J. Sobolak ◽  
Badih A. Jawad
Keyword(s):  
Glass Fiber ◽  
Wall Thickness ◽  
Shrinkage Rate ◽  
Measuring System ◽  
Fiber Concentration ◽  
Shrinkage Ratio ◽  
Control Factors ◽  
Injection Molded ◽  
Thin Walled ◽  
Processing Control

An anisotropy study was performed on a constrained thin-walled injection molded component using measurements made from a laser measuring system. Wall thickness and material glass fiber concentration were varied to determine their effects on parallel and perpendicular shrinkage rates. Several ranges of the processing control factors were used in the study. The shrinkages were determined and were described as a function of glass fiber concentration and wall thickness. The shrinkage ratio (a ratio representing the parallel shrinkage rate divided by the correlative perpendicular shrinkage rate) was used to investigate the influence of wall thickness and glass fiber (G.F.) concentration on shrinkage.

scholarly journals Tensile Strength Analysis of Thin-Walled Polymer Glass Fiber Reinforced Samples Manufactured by 3D Printing Technology

Polymers ◽  
2020 ◽  
Vol 12 (12) ◽  
pp. 2783
Author(s):  
Jerzy Bochnia ◽  
Malgorzata Blasiak ◽  
Tomasz Kozior
Keyword(s):  
Tensile Strength ◽  
Glass Fiber ◽  
Selective Laser Sintering ◽  
Strength Analysis ◽  
Fiber Reinforced ◽  
Glass Fiber Reinforced ◽  
Thin Walled ◽  
The Impact ◽  
Printing Direction ◽  
Thin Samples

The paper describes the mechanical properties, determined on the basis of a tensile strength test of a composite material based on glass-fiber reinforced polyamide and obtained by Selective Laser Sintering—SLS. The material used is PA 3200 GF. Thin walled samples with non-standard nominal thicknesses of 1, 1.4 and 1.8 mm, manufactured in three printing directions X, Y and Z, were used. The description included the impact of printing direction on the geometry of the obtained samples and tensile strength as well as the dependency of tensile strength on the sample thickness. The results can be useful for design engineers and process engineers designing thin-walled components produced with SLS. Thin samples were obtained with a considerable deviation spread of the actual dimension from the nominal one. It was found that the tensile strength of thin samples is much lower than those of standard cross-sections, which should be taken into account in the design of thin-walled elements.

Nano Modified Foam-Fiber-Concrete Mixture

2018 ◽  
Vol 284 ◽  
pp. 1036-1041
Author(s):  
V.A. Perfilov ◽  
V.V. Gabova
Keyword(s):  
Portland Cement ◽  
Glass Fiber ◽  
Quartz Sand ◽  
Density Ratio ◽  
Concrete Mixture ◽  
Fine Aggregate ◽  
Hollow Glass Microspheres ◽  
Hollow Glass ◽  
Fiber Concrete ◽  
Increased Strength

The article describes new compositions of foam-fiber-concrete mixture including portland cement, fine aggregate in the form of quartz sand, glass fiber, hollow glass microspheres, nanoadditives, foam generating agent and superplasticizing agent. The authors offer a technology for preparation of the mixture and determine the physical and mechanic properties of the hardened foam-fiber concrete. The obtained mixtures of foam materials have better compressive and extension strength with increased strength-density ratio as compared to analogous known mixtures of foam-fiber concrete.

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