Effect of carbon nanotubes on compressive, flexural and tensile strengths of Portland cement-based materials: A systematic literature review

Silvestro, Laura; Gleize, Philippe Jean Paul

doi:10.1016/j.conbuildmat.2020.120237

Cited by 106 publications

(50 citation statements)

References 54 publications

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“…The ANOVA/Tukey test indicated that these differences were statistically significant. These increase in mechanical strength with the addition of NW may be associated with some factors: (i) the filling of nanopores with the nanowhiskers can increase the compactness of the composite and therefore improve its mechanical strength [ 2 ]; (ii) the enhancement in cement hydration (indicated by the calorimetry results— Section 3.2 ) increases the amount of hydration products formed at a specific age, thus reducing the porosity of the composite; (iii) the so-called “bridge effect”, i.e., the NWs act as a nanoreinforcement, transferring the stress between the hydration products. This latter hypothesis is supported by the SE-SEM images of some NW-containing composites after the compressive strength test in Figure 7 , which show that NWs can be found along the cracks, in line with previous reports for CNT-cement composites [ 6 , 8 , 9 , 10 ].…”

Section: Resultsmentioning

confidence: 99%

“…Nanomaterials are potential candidates to improve the mechanical properties and durability of cementitious composites. Their very high specific surface area can enhance the hydration of Portland cement by providing an extra surface for the nucleation and growth of hydration products, in addition to the potential binding activity of some nanomaterials [ 1 , 2 ]. In this context, the incorporation of several nanomaterials has been tested in cementitious matrices.…”

Section: Introductionmentioning

confidence: 99%

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Utilization of Thermally Treated SiC Nanowhiskers and Superplasticizer for Cementitious Composite Production

et al. 2021

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Nanomaterials are potential candidates to improve the mechanical properties and durability of cementitious composites. SiC nanowhiskers (NWs) present exceptional mechanical properties and have already been successfully incorporated into different matrices. In this study, cementitious composites were produced with a superplasticizer (SP) and 0–1.0 wt % SiC NWs. Two different NWs were used: untreated (NT-NW) and thermally treated at 500 °C (500-NW). The rheological properties, cement hydration, mechanical properties, and microstructure were evaluated. The results showed that NWs incorporation statistically increased the yield stress of cement paste (by up to 10%) while it led to marginal effects in viscosity. NWs enhanced the early cement hydration, increasing the main heat flow peak. NWs incorporation increased the compressive strength, tensile strength, and thermal conductivity of composites by up to 56%, 66%, and 80%, respectively, while it did not statistically affect the water absorption. Scanning electron microscopy showed a good bond between NWs and cement matrix in addition to the bridging of cracks. Overall, the thermal treatment increased the specific surface area of NWs enhancing their effects on cement properties, while SP improved the NWs dispersion, increasing their beneficial effects on the hardened properties.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Utilization of Thermally Treated SiC Nanowhiskers and Superplasticizer for Cementitious Composite Production

et al. 2021

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“…However, some past studies have shown increases in compressive strength with the introduction of CNTs but their weight fractions are much higher, ranging from 0.5 wt.% to 2.0 wt.%. [32,34,38,87]. Other studies showed decreases in compressive strength with the addition of CNTs [55].…”

Section: Compressive Strengthmentioning

confidence: 93%

“…Various CBNs including carbon nanofibers (CNFs) [9,[19][20][21], carbon nanotubes (CNTs) [22][23][24][25][26][27] and graphene nanoplatelets (GNPs) [21,[28][29][30][31]. Previous results indicated that adding CNTs 0.05%-2% by weight of cement can improve mechanical properties including flexural strength, fracture energy, compressive strength, and toughness [10,[32][33][34][35][36][37][38][39][40][41]. Shah et al [42] and Konsta-Gdoutos et al [16,43] studied the effect of multi-walled carbon nanotubes (MWNTs) on the fracture properties of the nanocomposites and found a 25% increase in flexural strength by incorporating 0.048-0.08% of MWNT by weight of cement.…”

Section: Introductionmentioning

confidence: 99%

“…Hybrid graphene oxide (GO)/ CNTs, with the dosage of 0.05% by weight of cement and GO:CNTs mass ratio of 3:2, improved the compressive strength by 45%, which showed better reinforcing effects than the single addition of GO and CNTs with the same dosage respectively [28]. However, due to the large surface to volume ratios of nanomaterials, their uniform dispersion is a challenge [16,32,44]. The high surface area of nanomaterials and hydrophobic nature of the surface generates strong tendencies towards agglomeration through van der Waals forces, preventing their effective use as reinforcements [42,45,46].…”

Section: Introductionmentioning

confidence: 99%

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Ultra-high-performance cementitious composites with enhanced mechanical and durability characteristics

Sadiq

Soroushian²,

Bakker³

et al. 2021

SN Appl. Sci.

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Concrete is the most widely used construction material. It offers a desirable balance of cost, strength, moisture barrier qualities, and dimensional and chemical stability. The rising costs of aging infrastructure systems, however, point to the need for further improvements in concrete properties. Carbon-based nanomaterials (CBNs) are predicted to have excellent mechanical properties, and so are attractive candidates for addressing these issues. However, the relatively high cost of CBNs, means that only low weight fractions in cement matrices will be economically viable, which presents a significant challenge. The research presented here investigated various surface functionalization techniques for improving the compatibility of carbon nanomaterials (multi-walled carbon nanotubes, carbon nanofiber and graphene nanoplatelets) with cementitious materials in fresh and hardened state. The effects of surface functionalization on the contributions of CBNs to the performance characteristics of ultra-high-performance cementitious matrices (UHPCM) were evaluated. Functionalized multi-walled carbon nanotubes at 0.03% weight fraction increased the flexural strength by 30%, doubled the energy absorption capacity, and tripled the ductility of UHPCM. The moisture barrier qualities, abrasion resistance and toughness characteristics of UHPCM benefited significantly from introduction of CBNs at less than 0.1% weight fraction. This study demonstrates that the low weight fraction of CBNs can effectively enhance the key engineering properties of UHPCM at a viable cost. Thus, this approach has both performance advantages and economic benefits. Article highlights Surface functionalization of multiwalled CNTs improved dispersion in cementitious matrices at low weight fractions. 0.03 wt.% multiwalled CNT addition increased the flexural strength and the flexural toughness of UHPCM. Abrasion resistance and moisture barrier qualities improved. These improvements are achieved at viable cost.

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Effect of nickel-coated carbon nanotubes on the tensile behaviors of ultra-high performance concrete (UHPC): insights from experiments and molecular dynamic simulations

Wang,

Qiu

et al. 2023

J Mater Sci

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Effect of carbon nanotubes on compressive, flexural and tensile strengths of Portland cement-based materials: A systematic literature review

Cited by 106 publications

References 54 publications

Utilization of Thermally Treated SiC Nanowhiskers and Superplasticizer for Cementitious Composite Production

Utilization of Thermally Treated SiC Nanowhiskers and Superplasticizer for Cementitious Composite Production

Ultra-high-performance cementitious composites with enhanced mechanical and durability characteristics

Effect of nickel-coated carbon nanotubes on the tensile behaviors of ultra-high performance concrete (UHPC): insights from experiments and molecular dynamic simulations

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