A systematic study on EN-998-2 premixed mortars modified with graphene-based materials

Chougan, Mehdi; Marotta, Emanuele; Lamastra, Francesca Romana; Vivio, Francesco; Montesperelli, Giampiero; Ianniruberto, U; Bianco, Alessandra

doi:10.1016/j.conbuildmat.2019.116701

Cited by 45 publications

(27 citation statements)

References 52 publications

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“…However, on the other hand, the super water sorbent nature of these particles consume the mixes' moisture, leading to the increased rheology values such as yield shear stress, plastic viscosity and apparent viscosity (Pan et al 2015;Jing et al 2017). Chougan et al (2019) confirmed that in the case of sample modified with the large-sized GNPs (i.e. average lateral size: 30 µm) in special dosages, the lubrication effect dominated over the thickening effect, resulting in the decreased rheology values.…”

Section: Silicon-based Graphene-based and Clay Nanoparticles: Fresh Propertiesmentioning

confidence: 63%

“…Therefore, this section will explore the relevant available literature surrounding GBMs-reinforced cementitious composites, both traditionally casted and printed, to gauge the potential benefits these reinforcement materials can have on the fresh properties of a cementitious mixture. It is well accepted that the fresh properties of GBM-modified cementitious composites are highly dependent on the dosage, the number of wrinkles on the particle's surface, oxygen content and the dimension of GBMs (Chougan et al 2019). The presence of GBM particles within the cementitious composites in one hand can induce the lubrication effect in specific dosages, which decreases the rheology values (Zhu et al 2012).…”

Section: Silicon-based Graphene-based and Clay Nanoparticles: Fresh Propertiesmentioning

confidence: 99%

“…3. Acceleration in the binder's hydration kinetics acts as a catalyst and heterogeneous nucleation site (Chougan et al 2019).…”

Section: Comparison Of the Effects Of Ultra And Nanosized Admixturesmentioning

confidence: 99%

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The effects of nano- and micro-sized additives on 3D printable cementitious and alkali-activated composites: a review

et al. 2021

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Additive manufacturing (AM), also referred as 3D printing, is a technology that enables building automated three-dimensional objects in a layer-by-layer manner. AM of cement-based and alkali-activated composites has gathered attention over the last decade and is one of the most rapidly developing civil engineering fields. Development of proper mixture compositions which are suitable in fresh and hardened state is one of the key challenges of AM technology in construction. As the behaviour of cement-based materials (CBM) and alkali-activated materials (AAM) is determined by chemical and physical processes at the nano-level, incorporation of nano- and micro-sized admixtures has great influence on the performance of printable composites. These modifications are attributed to the unique reactivity of nanoparticles associated with their small size and large surface area. This review paper summarizes recent developments in the application of nano- and micro-particles on 3D printable cementitious composites and how they influence the performance of 3D-printed construction materials. The research progress on nano-engineered CBM and AAM is reviewed from the view of fresh and hardened properties. Moreover, comparison between nano- and micro-sized admixtures including nanosilica, graphene-based materials, and clay nanoparticles as well as chemical admixtures such as viscosity-modifying admixtures and superplasticizers is presented. Finally, the existing problems in current research and future perspectives are summarized. This review provides useful recommendations toward the significant influence of nano- and micro-sized admixtures on the performance of 3D printable CBMs.

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Section: Silicon-based Graphene-based and Clay Nanoparticles: Fresh Propertiesmentioning

confidence: 63%

Section: Silicon-based Graphene-based and Clay Nanoparticles: Fresh Propertiesmentioning

confidence: 99%

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The effects of nano- and micro-sized additives on 3D printable cementitious and alkali-activated composites: a review

et al. 2021

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“…It can be concluded that, despite numerous encouraging outcomes, further research efforts are clearly still needed in this area to reach a cost-effective, environmentally friendly, and safe translation of GO-modified cementitious materials to the market. However, according to the most up-to-date literature, cement-based nanocomposites loaded with an extra-low dosage of GO have been scarcely investigated [2,22]. Aimed to fill this gap of knowledge, the Authors herein present a research paper focused on the impact of 0.01% (by weight of cement) of commercially available GO nano-powder on the properties of fresh admixtures and the resulting hardened cement-based nanocomposites.…”

Section: Introductionmentioning

confidence: 99%

Extra-Low Dosage Graphene Oxide Cementitious Nanocomposites: A Nano- to Macroscale Approach

et al. 2021

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The impact of extra-low dosage (0.01% by weight of cement) Graphene Oxide (GO) on the properties of fresh and hardened nanocomposites was assessed. The use of a minimum amount of 2-D nanofiller would minimize costs and sustainability issues, therefore encouraging the market uptake of nanoengineered cement-based materials. GO was characterized by X-ray Photoelectron Spectroscopy (XPS), Fourier-transform infrared spectroscopy (FTIR), Atomic Force Microscopy (AFM), X-ray Diffraction (XRD), and Raman spectroscopy. GO consisted of stacked sheets up to 600 nm × 800 nm wide and 2 nm thick, oxygen content 31 at%. The impact of GO on the fresh admixtures was evaluated by rheology, flowability, and workability measurements. GO-modified samples were characterized by density measurements, Scanning Electron Microscopy (SEM) analysis, and compression and bending tests. Permeability was investigated using the boiling-water saturation technique, salt ponding test, and Initial Surface Absorption Test (ISAT). At 28 days, GO-nanocomposite exhibited increased density (+14%), improved compressive and flexural strength (+29% and +13%, respectively), and decreased permeability compared to the control sample. The strengthening effect dominated over the adverse effects associated with the worsening of the fresh properties; reduced permeability was mainly attributed to the refining of the pore network induced by the presence of GO.

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“…A 15% reduction in the diffused solar reflectance, uniform in the overall spectrum, has been reported [ 127 ]. A slight increase in density (+5.4%) was observed with 0.01wt% GNPs [ 129 ].…”

Section: Nanomaterials Typically Used In Cement-based Materialsmentioning

confidence: 99%

Nanomaterials in Cementitious Composites: An Update

et al. 2021

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This review is an update about the addition of nanomaterials in cementitious composites in order to improve their performance. The most common used nanomaterials for cementitious materials are carbon nanotubes, nanocellulose, nanographene, graphene oxide, nanosilica and nanoTiO2. All these nanomaterials can improve the physical, mechanical, thermal and electrical properties of cementitious composites, for example increase their compressive and tensile strength, accelerate hydration, decrease porosity and enhance fire resistance. Cement based materials have a very complex nanostructure consisting of hydration products, crystals, unhydrated cement particles and nanoporosity where traditional reinforcement, which is at the macro and micro scale, is not effective. Nanomaterials can reinforce the nanoscale, which wasn’t possible heretofore, enhancing the performance of the cementitious matrix.

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A systematic study on EN-998-2 premixed mortars modified with graphene-based materials

Cited by 45 publications

References 52 publications

The effects of nano- and micro-sized additives on 3D printable cementitious and alkali-activated composites: a review

The effects of nano- and micro-sized additives on 3D printable cementitious and alkali-activated composites: a review

Extra-Low Dosage Graphene Oxide Cementitious Nanocomposites: A Nano- to Macroscale Approach

Nanomaterials in Cementitious Composites: An Update

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