Mechanical properties of ultra-high-performance concrete enhanced with graphite nanoplatelets and carbon nanofibers

Meng, Weina; Khayat, Kamal H.

doi:10.1016/j.compositesb.2016.09.069

Cited by 294 publications

(101 citation statements)

References 27 publications

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“…However, this difference is not statistically significant at a significance level of 0.05. In addition to adding fibres, the impact bending of fibrereinforced geopolymers can be further increased by increasing the proportion of cement in the geopolymer [18] or by adding a small amount of carbon nanomaterials such as carbon nanotubes or nanofibers [19]. Figure 4 shows the effect of fibre reinforcement on flexural strength.…”

Section: Statistical Data Processingmentioning

confidence: 99%

Impact of Flax and Basalt Fibre Reinforcement on Selected Properties of Geopolymer Composites

et al. 2019

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The submitted paper deals with the physical and mechanical properties of geopolymer composite materials reinforced with natural fibres. For this study, we aimed to develop a geopolymer composite reinforced with long flax fibres, which were implemented in the geopolymer in the form of a nonwoven fabric that reinforced the structure of the geopolymer over the entire thickness of the board. In order to compare the properties of the developed composite with natural fibres, a geopolymer without fibres and a geopolymer reinforced with basalt fibres were also produced. The monitored mechanical properties were impact bending, bending strength and compressive strength. Differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), Fourier transform infrared spectroscopy (FTIR) and microscopic analysis were also carried out. The results clearly showed the positive effect of the addition of natural fibres on impact bending and bending strength. However, the addition of natural fibres in the form of a nonwoven fabric significantly increased the variability of the properties of the developed composites. In addition, a different pattern of joint failure was noted between geopolymer reinforced with flax fibres and geopolymer reinforced with basalt fibres.

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Section: Statistical Data Processingmentioning

confidence: 99%

Impact of Flax and Basalt Fibre Reinforcement on Selected Properties of Geopolymer Composites

et al. 2019

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“…According to this method, a wide range of concrete mixtures should be narrowed by the optimization of binder combinations, the W/C ratio, sand combination, the paste/sand volume ratio, and the steel fiber volume in order to ensure different fresh and hardened properties of the concretes, such as flowability, rheological properties, and compressive strength; then, the narrowed optimal set of design mixtures should be evaluated using the cost performance [4]. This optimization method was also used by Meng and Khayat [34], who added nanomaterials (graphite nanoplatelets and carbon nanofibers) to the mixture optimized by Meng et al [4] to improve the cracking resistance and the fracture toughness of the UHPC. Therefore, future research should consider using this optimization method to evaluate the environmental impacts of byproduct-based concretes.…”

Section: Limitationsmentioning

confidence: 99%

The Effect of Different Concrete Designs on the Life-Cycle Assessment of the Environmental Impacts of Concretes Containing Furnace Bottom-Ash Instead of Sand

Pushkar

2019

Sustainability

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The results of life-cycle assessments (LCAs) of concrete are highly dependent on the concrete design method. In this study, LCAs were conducted to evaluate the environmental impacts of the replacement of sand with furnace bottom-ash (FBA) in concrete. In the FBA-based concretes, sand was replaced with FBA at proportions of 0, 30, 50, 70, and 100 wt%. Two design methods were studied: (i) concrete with fixed slump ranges of 0-10 mm (CON-fix-SLUMP-0-10) and 30-60 mm (CON-fix-SLUMP-30-60); and (ii) concrete with fixed water/cement (W/C) ratios of 0.45 (CON-fix-W/C-0.45) and 0.55 (CON-fix-W/C-0.55). The ReCiPe2016 midpoint and single-score (six methodological options) methods were used to compare the environmental damage caused by the FBA-based concretes. A two-stage nested (hierarchical) analysis of variance (ANOVA) was used to simultaneously evaluate the results of six ReCiPe2016 methodologies. The ReCiPe2016 results indicate that replacing sand with FBA decreased the environmental impact of the concretes with fixed slump ranges and increased the environmental impact of the concretes with fixed W/C ratios. Therefore, using FBA as a partial sand replacement in concrete production is of debatable utility, as its impact highly depends on the concrete design method used.Sustainability 2019, 11, 4083 2 of 20 several industrial byproducts, such as FA, FBA, copper slag (CS), and quarry dust powder (QDP) [7][8][9]. Chowdhury et al. [7] studied the full replacement of sand with FA and FBA in road construction, and reported mixed results: climate change (e.g., CO 2 emissions) and environmental acidification were found to be lower for the byproducts, whereas the formation of particulate matter was found to be lower for the sand. Kua [8] performed a life-cycle assessment (LCA) of high-performance concrete in which sand had been partially (10 vol%) replaced with CS, and reported an increased climate change impact (e.g., increased CO 2 emissions) compared to that of conventional concrete. Lim et al. [9] studied the replacement of a high percentage of sand with QDP in lightweight foamed concrete, and reported a decrease in CO 2 emissions of up to 10%. This highlights that the effect of the partial or full substitution of sand in the production of concrete is not fully understood and requires additional research.Among all the possible industrial byproducts, the conversion of waste from coal-fired electricity production into an environmentally friendly byproduct for the production of concrete is a pressing issue for environmentally sustainable development in many countries [2]. For example, Zhang and Poon [10] considered the use of FBA, a waste byproduct from coal-fired electricity production, as an alternative to natural fine aggregates in byproduct-based concrete production to improve the concrete's environmental impact.The problem of producing concrete with a low environmental impact is also important for Israel. Concrete is a major building material in Israel [11], and furthermore, according to the Israel Electric Corporation Lt...

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“…Some nanoparticles with high chemical activity act as nuclei for cement hydration products and thereby promote the degree of cement hydration . High‐strength nanomaterials are used as nanofillers to densify and reinforce nanostructures of cement hydration products …”

Section: Introductionmentioning

confidence: 99%

Improved Interfacial Bonding Strength and Reliability of Functionalized Graphene Oxide for Cement Reinforcement Applications

Wang

Tang

et al. 2020

Chemistry A European J

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Poor bonding strength between nanomaterials and cementc omposites inevitably lead to the failure of reinforcement.H erein, an ovel functionalization method for the fabrication of functionalizedg raphene oxide (FGO),w hichi s capable of forming highly reliable covalentb onds with cement hydration products,a nd therefore, suitable for use as an efficient reinforcing agent for cementc omposites, is discussed. The bonding strength between cementa nd aggregates was improved more than 21 times with the reinforcement of FGO. The fabricated FGO also demonstrated many important features, including high reliability in cement pastes,good dispersibility,and efficient structuralr efinement of cementh ydration products. With the incorporation of FGO, cement mortars amples demonstrated up to 40 %i ncreasede arly and ultimates trength. Such results make the fast demolding and manufacture of light constructions become highly possible, and show strongadvantages on improvingp roductivity,s aving cost, and reducingC O 2 emissions in practical applications.

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Mechanical properties of ultra-high-performance concrete enhanced with graphite nanoplatelets and carbon nanofibers

Cited by 294 publications

References 27 publications

Impact of Flax and Basalt Fibre Reinforcement on Selected Properties of Geopolymer Composites

Impact of Flax and Basalt Fibre Reinforcement on Selected Properties of Geopolymer Composites

The Effect of Different Concrete Designs on the Life-Cycle Assessment of the Environmental Impacts of Concretes Containing Furnace Bottom-Ash Instead of Sand

Improved Interfacial Bonding Strength and Reliability of Functionalized Graphene Oxide for Cement Reinforcement Applications

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