Influence of multi-walled carbon nanotubes on the residual performance of concrete exposed to high temperatures

Baloch, Waqas Latif; Khushnood, Rao Arsalan; Khaliq, Wasim

doi:10.1016/j.conbuildmat.2018.07.051

Cited by 96 publications

(33 citation statements)

References 31 publications

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“…This substantial reduction in shrinkage response of nano-modified samples is due to the refinement of pore size and the filler effect of these nano-materials. The literature suggests that the presence of nano-materials in cement helps the hydration products grow [54]. These nano-materials can act as a nucleation site and provide a platform for hydrates, such as calcium silicate hydrate gel (CSH), to grow.…”

Section: Linear Shrinkage Protocolsmentioning

confidence: 99%

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Experimental Investigation of Hybrid Carbon Nanotubes and Graphite Nanoplatelets on Rheology, Shrinkage, Mechanical, and Microstructure of SCCM

et al. 2020

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Carbon nanotubes (CNTs) and graphite nanoplatelets (GNPs) belong to the family of graphite nanomaterials (GNMs) and are promising candidates for enhancing properties of cementitious matrix. However, the problem lies with their improper dispersion. In this paper graphite nanoplatelets are used with carbon nanotubes for dispersion facilitation of CNTs in cement mortar. The intended role is to use the GNPs particles for dispersion of CNTs and to investigate the synergistic effect of resulting nano-intruded mortar. Mechanical properties such as flexure and compressive strength have been studied along with volumetric stability, rheology, and workability. Varying dosages of CNTs to GNPs have been formulated and were analyzed. The hybrid use of CNTs-GNPs shows promise. Scanning electron microscopy reveals that hybrid CNTs/GNPs are well-suited for use in cement mortar composite performing a dual function.

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Section: Linear Shrinkage Protocolsmentioning

confidence: 99%

“…On the other hand, S3 formulation shows a decrease in viscosity value as compared with CNTs mixture. This is due to the denser packing of GNP within the matrix [54].…”

Section: Flexural Strengthmentioning

confidence: 99%

Experimental Investigation of Hybrid Carbon Nanotubes and Graphite Nanoplatelets on Rheology, Shrinkage, Mechanical, and Microstructure of SCCM

et al. 2020

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“…Recently, several researchers [109,110,111,112,113,114,115,116,117,118,119,120,121,122,123] have reported the effects of CNTs on the electrical and mechanical properties of concrete samples. For instance, CNTs can decrease the formation and growth of micro-cracks in concrete.…”

Section: Nanomaterials In Cement-based Materialsmentioning

confidence: 99%

Recent Progress in Nanomaterials for Modern Concrete Infrastructure: Advantages and Challenges

et al. 2019

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Modern concrete infrastructure requires structural components with higher mechanical strength and greater durability. A solution is the addition of nanomaterials to cement-based materials, which can enhance their mechanical properties. Some such nanomaterials include nano-silica (nano-SiO2), nano-alumina (nano-Al2O3), nano-ferric oxide (nano-Fe2O3), nano-titanium oxide (nano-TiO2), carbon nanotubes (CNTs), graphene and graphene oxide. These nanomaterials can be added to cement with other reinforcement materials such as steel fibers, glass, rice hull powder and fly ash. Optimal dosages of these materials can improve the compressive, tensile and flexural strength of cement-based materials, as well as their water absorption and workability. The use of these nanomaterials can enhance the performance and life cycle of concrete infrastructures. This review presents recent researches about the main effects on performance of cement-based composites caused by the incorporation of nanomaterials. The nanomaterials could decrease the cement porosity, generating a denser interfacial transition zone. In addition, nanomaterials reinforced cement can allow the construction of high-strength concrete structures with greater durability, which will decrease the maintenance requirements or early replacement. Also, the incorporation of nano-TiO2 and CNTs in cementitious matrices can provide concrete structures with self-cleaning and self-sensing abilities. These advantages could help in the photocatalytic decomposition of pollutants and structural health monitoring of the concrete structures. The nanomaterials have a great potential for applications in smart infrastructure based on high-strength concrete structures.

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“…The absolute and relative values of residual elastic modulus of all mixtures under elevated temperatures are plotted in Figure 10. According to [39,40], the elasticity modulus of each mixture is determined to be the secant modulus at one third of peak stress on the rising section of the corresponding uniaxial compressive stress-strain curve. The coefficient of variation of the elastic modulus tests was between 5.1% and 22.3%.…”

Section: Elastic Modulus and Compressive Peak Strainsmentioning

confidence: 99%

“…It is noted that when similar β values are inferred from different concrete types, the unified expressions are given. [28], MLWC [40], plain and steel fiber-reinforced self-consolidating concretes (SCC and SCC-S), the NWC, and the normalized residual splitting tensile strength given in Euro code 2 (2003) [41]. As presented in Figure 14b, the relative values of splitting tensile strength of concretes without steel fiber (including NWC, SLWC, and ALWC), at each corresponding temperature were close to those of NWC [39], RPC with straight steel fiber [28], and plain SCC [27].…”

Section: Numerical Models 41 High-temperature Property Relationshipsmentioning

confidence: 99%

Mechanical Behavior of Steel Fiber-Reinforced Lightweight Concrete Exposed to High Temperatures

Wang

Wei

et al. 2020

Applied Sciences

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The mechanical characteristics of steel fiber-reinforced lightweight concrete (SFLWC) under high temperatures are studied in this paper. Different concrete matrices, including all-lightweight concrete (ALWC) and semi-lightweight concrete (SLWC), and different steel fibers with hooked ends and crimped shapes are considered as objects. In addition, normal-weight limestone aggregates concrete (NWC), no-fiber ALWC, and SLWC were tested after high-temperature treatment as a control group. The temperature effects on the splitting tensile strength, ultrasonic pulse velocity, compressive stress–strain curve, elastic module, peak strain, and axial compressive strength of the SFLWC were investigated. The results showed that, with increasing exposure temperature, both the axial compressive strength and the elastic modulus decreased, while the axial peak strain has a certain increase, and hence the stress–strain curves were gradually flattened. The toughness of all the concretes increased first and then reduced with increasing temperature, while the specific toughness of all the concretes increased with the increase in temperature. Compared with NWC and SLWC, ALWC had a better capacity to resist high temperatures, especially temperatures > 400 °C. Adding steel fibers can improve the capacity of energy absorption, specific toughness, and residual splitting tensile strength of lightweight concrete (LWC) before and after it is exposed to high temperatures. Based on a regression analysis, a segmented constitutive equation for LWC and SFLWC under uniaxial compression was derived from fitting the experimental findings, and the fitting curve agrees well with the test results.

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Influence of multi-walled carbon nanotubes on the residual performance of concrete exposed to high temperatures

Cited by 96 publications

References 31 publications

Experimental Investigation of Hybrid Carbon Nanotubes and Graphite Nanoplatelets on Rheology, Shrinkage, Mechanical, and Microstructure of SCCM

Experimental Investigation of Hybrid Carbon Nanotubes and Graphite Nanoplatelets on Rheology, Shrinkage, Mechanical, and Microstructure of SCCM

Recent Progress in Nanomaterials for Modern Concrete Infrastructure: Advantages and Challenges

Mechanical Behavior of Steel Fiber-Reinforced Lightweight Concrete Exposed to High Temperatures

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