statement of problem: it is yet unclear whether fiber-reinforced composite posts can enhance the mechanical properties and prevent vertical fractures of teeth under chewing loads. purpose: the purpose of this study was to compare the fracture resistance and failure mode of endodontically treated teeth restored with three different post systems. materials and methods: thirty-six maxillary canine...

Fractured abutment screws may be replaced; however, sometimes, the screw cannot be removed and the entire implant must be surgically removed and replaced. The aim of this study was to compare the fracture resistance of abutment retention screws made of titanium, polyetheretherketone (PEEK) and 30% carbon fiber-reinforced PEEK, using an external hexagonal implant/UCLA-type abutment interface ass...

in the present study, modelling and vibration analysis of carbon nanotubes/ fiber/ polymer composite microplates are investigated. the governing equations of the carbon nanotubes/ fiber/ polymer composite microplates are derived based on first order shear deformation plate theory, rather than other plate theories, due to accuracy and simplicity of polynomial functions. the modified couple stres...

Magnesium phosphate cement (MPC) has been proven to be a very good repair material for deteriorated concrete structures. It has excellent adhesion performance, leading to high bonding strength with old concrete substrates. This paper presents an experimental study into the properties of MPC binder as the matrix of carbon fiber sheets to form fiber-reinforced inorganic polymer (FRIP) composites....

Carbon fiber reinforced polymer laminates are increasingly used in the aerospace and civil engineering fields. Identifying cracks in carbon fiber reinforced polymer laminated beam components is of considerable significance for ensuring the integrity and safety of the whole structures. With the development of high-resolution measurement technologies, mode-shape-based crack identification in such...

Tests of deep concrete beams with internal fiber-reinforced polymer (FRP) reinforcement have shown that such members can exhibit lower shear strength than members with conventional steel reinforcement. To model this effect, the current paper proposes an approach based on a two-parameter kinematic theory (2PKT) for conventional deep beams. The 2PKT is built on a kinematic model with two degrees ...

Abstract Polymer fiber reinforcement can elevate the pavement performance indicators of asphalt concrete, including low temperature crack resistance, high stability, and water stability. Fiber-reinforced concrete (FRAC) is a suitable solution to improve road concrete. However, mechanism parameters in has still not been introduced. Herein we studied influence geometry characteristics on improvin...

In the technological world, retrofitting of damaged structures has been emerged as an essential need and a common technique. For indent retrofitting, fiber reinforced polymer composites are used. Due to its beneficial properties, they used in massive work fields. Fiber polymers holds high strength weight ratio. area civil engineering, FRP habituated strengthen existing RC structures. extended e...

In the present study, effects of adding fibers and Reclaimed Asphalt Pavement (RAP) on low temperature performances open graded asphalt mixtures for surface layer dense surface, binder, base layers were investigated. Two different kinds used: a combination aramid polyolefins utilized preparing fiber reinforced porous mixtures, while polyacrylonitrile employed producing conventional layers. Refe...

In order to improve flexural and impact performance, thin panels of steel fiber-reinforced ultra-high performance concrete (UHPC) were further reinforced with external layers continuous thermoplastic (CFRTP) composites. CFRTP sheets bonded 305 × 12 mm UHPC using two different techniques. First, unidirectional E-glass tapes polyethylene terephthalate glycol-modified (PETG) arranged in fused the ...