Multiscale dynamic fracture behavior of the carbon nanotube reinforced concrete under impact loading

Eftekhari, Mehdi; Mohammadi, Soheil

doi:10.1016/j.ijimpeng.2015.06.023

Cited by 46 publications

(9 citation statements)

References 36 publications

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“…The main disadvantage of fiber reinforced concrete was difficult in fabrication and cost needed is more compared to plain concrete. [9] II. METHODOLOGY To achieve objectives of research work proper methodology has to be set.…”

Section: Introductionmentioning

confidence: 99%

Toughness Characterization of Fiber Reinforced Concrete Beam using Fracture Mechanics

Malipatil¹,

Meti²,

Itti³

2020

IJEAT

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The study of fracture mechanics was very much essential because it gives clear idea of arising and propagation of cracks, cause for failure, life of structure, etc. The main aim of this research was to study the fracture behavior of fiber reinforced concrete which was reinforced with polypropylene fiber. The fiber used in concrete with different volume fraction like 0.5%, 0.75% and 1% of total volume of cementitious material. The specimens were prepared with different grades of concrete with different dosage of fiber and then subjected to three point bending test. Using test results the fracture properties like fracture energy, flexural strength; stress intensity factor, fracture toughness and stiffness were found. The experimental results showed that effectiveness of polypropylene fiber for different grades of concrete that is normal, medium and high strength concrete increases with increase in fiber volume and also the fracture properties of fiber reinforced concrete increases with increase in fiber volume and effectiveness of fiber was found for dosage of about 0.75-1% volume

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Section: Introductionmentioning

confidence: 99%

Toughness Characterization of Fiber Reinforced Concrete Beam using Fracture Mechanics

Malipatil¹,

Meti²,

Itti³

2020

IJEAT

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“…Experiments with nanomaterials have already allowed for the development of lower cost high-performance cement compounds used extensively in civil engineering [2,6]. The properties of concrete in its initial state, such as its fluidity and workability, are governed by the distribution and size of the particles, while the properties of concrete in its hardened state, such as strength and durability, are affected both by the size of the particles and by the arrangement or grouping of the aggregate [7].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Carbon Nanotube Incorporation in Cementitious Composite Materials

et al. 2019

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Over the last decades, new materials with outstanding performance have been introduced in the construction industry. Considering these new technologies, it is worth mentioning that nanotechnology has revolutionized various areas of engineering. In the area of civil engineering and construction, cement is used for various purposes and the search to improve its performance has been receiving growing interest within the scientific community. The objective of this research was to evaluate the behavior of cement mortar produced by the addition of multi-walled carbon nanotubes (MWCNTs) in different concentrations by comparing their physical and mechanical properties with the properties of the nanotube-free composite. Motivated by the lack of consensus in the literature concerning to the optimal dosage of CNTs in cementitious matrices, three different carbon nanotube ratios, 0.20, 0.40 and 0.60 wt % Portland cement, were investigated with the aim of evaluating the mechanical properties. Destructive tests were carried out to determine the compressive strength, flexural strength and split tensile strength. Additionally, a non-destructive test was performed to determine the dynamic elastic modulus and density. Scanning electron microscopy (SEM) images showed the interaction between the MWCNTs and the hydration products of Portland cement mortar. The results indicated the potential contribution of 0.40 wt % cement CNTs to the enhancement of the mechanical properties of the cement composite as a promising construction material.

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“…With the progression of science and technology, people are demanding higher functionality of building structures, in hopes of improving the carrying capacity and deformation capacity of structures through a strengthening process while monitoring and diagnosing the health of the structure in real-time [6][7][8][9]. In the past, the cement base was the main research object in the domain of intelligent materials and polymer base was rarely used as a reinforcement material [10,11]. By adding carbon nanofiber (CNF) to PUC reinforcement materials, a carbon nanocarbon fiber polyurethane cement material (CNFPUC) could be made and thus, the fluidity of the mixture could be improved, with the advantages of low density, high specific modulus, high specific strength, high conductivity, thermal stability, compact structure and so forth [12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Dispersion and Pressure Sensitivity of Carbon Nanofiber-Reinforced Polyurethane Cement

2018

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The sensitivity of carbon nanofiber polyurethane cement (CNFPUC) was evaluated to determine whether the cement can act as an intelligent reinforcement material. The percolation thresholds at different polymer-to-cement ratios were determined through experimentation. Taking a specific carbon nanofiber (CNF) content of the percolation zone, several CNFPUC mixtures with different poly-ash ratios and silica fume contents were made. They were then sampled from the mixture and poured into a hexahedron CNFPUC test block; the coefficient of variation of resistance and the piezoresistive characteristics under axial load were examined and the blocks were examined by scanning electron microscope. The sensitivity of the CNFPUC mixture was evaluated via the resistance variation coefficient of a sample hexahedron. For different CNF dosages, the critical value of the variation coefficient was used to assess the sensitivity characteristic by fitting the conic curve. These findings may provide a novel and simple method for determining the sensitivity of CNFPUC mixtures.

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Multiscale dynamic fracture behavior of the carbon nanotube reinforced concrete under impact loading

Cited by 46 publications

References 36 publications

Toughness Characterization of Fiber Reinforced Concrete Beam using Fracture Mechanics

Toughness Characterization of Fiber Reinforced Concrete Beam using Fracture Mechanics

Evaluation of Carbon Nanotube Incorporation in Cementitious Composite Materials

Dispersion and Pressure Sensitivity of Carbon Nanofiber-Reinforced Polyurethane Cement

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