Influence of nano-SiO2 and nano-Al2O3 additions on steel-to-concrete bonding

Ismael, R.; Silva, J.V.; Carmo, Ricardo do; Soldado, Eliana; Lourenço, Cléber S.; Costa, Hugo; Júlio, Eduardo

doi:10.1016/j.conbuildmat.2016.08.152

Cited by 62 publications

(25 citation statements)

References 18 publications

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“…Most recent experimental studies conducted by the authors aimed at understanding the effect of the addition of nanoparticles on the steel-to-concrete bond [38,39] and on both the shear strength and the bending strength of RC beams [40]. To characterize the steel-to-concrete bond stress, 32 pull-out tests (Figure 7a) and 16 tensile tests were performed.…”

Section: Structures Made With Nanoconcretementioning

confidence: 99%

“…The latter were conducted on reinforced concrete ties, and the goal was to analyse the cracks' width (Figure 7b,c). In these tests, plain and ribbed rebars, as well as eight different types of concrete mixtures, were used [38]. The effect of adding nanoparticles on steel fibres-to-paste bond was also analysed using a modified pull-out test to monitor the fibre's slip versus the applied load (Figure 7d) [39].…”

Section: Structures Made With Nanoconcretementioning

confidence: 99%

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New Trends for Reinforced Concrete Structures: Some Results of Exploratory Studies

Carmo

Júlio

2017

Infrastructures

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Today, the concrete sector is being pushed to innovate in order to better address current challenges with higher competitiveness and more sustainable solutions. Different research studies have been conducted all over the world in which novel approaches and paths were proposed. It is important to spread information to define new strategies for the future of this industry. The enhancement of concrete properties and the impact of these changes in structural design are some of the topics analysed in those studies. This paper presents four experimental studies conducted by the authors where different types of concrete and structural members were tested. The common goal of these studies was to develop innovative solutions with high performance and low environmental impact. The scope of the first study was the structural behaviour of members produced with lightweight aggregate concrete (LWAC). Results of several beams, ties, and slabs are herein presented and analysed. The advantage of using glass fibre-reinforced polymer (GFRP) rebars was addressed in a second study, and main results obtained with this type of rebar are also herein presented. Recent advances in nanotechnology led to the development of concretes incorporating nanoparticles into the binder matrix. Typically, these nanoparticles have a diameter of 10-300 nanometers and are added to the mixture to reduce the porosity and increase the density of the binder matrix, improving the mechanical properties and durability. To analyse their influence on steel-to-concrete bonding and on the shear and flexural behaviour of the beams was the main goal of the third study herein described. Finally, a new concept to produce reinforced concrete members with high durability using a special concrete cover, which was the goal of the fourth study, is also herein presented.

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Section: Structures Made With Nanoconcretementioning

confidence: 99%

Section: Structures Made With Nanoconcretementioning

confidence: 99%

New Trends for Reinforced Concrete Structures: Some Results of Exploratory Studies

Carmo

Júlio

2017

Infrastructures

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“…Ismael et al [109] studied the influence of nanosilica and nano-alumina on the steel-concrete bonding. Although no effect was observed in fibre reinforced concrete, different findings arose in steel reinforced concrete.…”

Section: Nanoinclusionsmentioning

confidence: 99%

Nano-Inclusions Applied in Cement-Matrix Composites: A Review

et al. 2016

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Research on cement-based materials is trying to exploit the synergies that nanomaterials can provide. This paper describes the findings reported in the last decade on the improvement of these materials regarding, on the one hand, their mechanical performance and, on the other hand, the new properties they provide. These features are mainly based on the electrical and chemical characteristics of nanomaterials, thus allowing cement-based elements to acquire “smart” functions. In this paper, we provide a quantitative approach to the reinforcements achieved to date. The fundamental concepts of nanoscience are introduced and the need of both sophisticated devices to identify nanostructures and techniques to disperse nanomaterials in the cement paste are also highlighted. Promising results have been obtained, but, in order to turn these advances into commercial products, technical, social and standardisation barriers should be overcome. From the results collected, it can be deduced that nanomaterials are able to reduce the consumption of cement because of their reinforcing effect, as well as to convert cement-based products into electric/thermal sensors or crack repairing materials. The main obstacle to foster the implementation of such applications worldwide is the high cost of their synthesis and dispersion techniques, especially for carbon nanotubes and graphene oxide.

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“…Li et al [147] have presented an overview of improvements in compressive and flexural strengths of mortars containing nanosilica, nano-Fe 2 O 3 , SF, and combinations of them. Ismael et al [148] reported an increase of roughly 25% of the bond between matrix and steel rebars using separately nanosilica and nanoalumina.…”

Section: Nanoinclusionsmentioning

confidence: 99%

Admixtures in Cement-Matrix Composites for Mechanical Reinforcement, Sustainability, and Smart Features

et al. 2016

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For more than a century, several inclusions have been mixed with Portland cement—nowadays the most-consumed construction material worldwide—to improve both the strength and durability required for construction. The present paper describes the different families of inclusions that can be combined with cement matrix and reviews the achievements reported to date regarding mechanical performance, as well as two other innovative functionalities of growing importance: reducing the high carbon footprint of Portland cement, and obtaining new smart features. Nanomaterials stand out in the production of such advanced features, allowing the construction of smart or multi-functional structures by means of thermal- and strain-sensing, and photocatalytic properties. The first self-cleaning concretes (photocatalytic) have reached the markets. In this sense, it is expected that smart concretes will be commercialized to address specialized needs in construction and architecture. Conversely, other inclusions that enhance strength or reduce the environmental impact remain in the research stage, in spite of the promising results reported in these issues. Despite the fact that such functionalities are especially profitable in the case of massive cement consumption, the shift from the deeply established Portland cement to green cements still has to overcome economic, institutional, and technical barriers.

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Influence of nano-SiO2 and nano-Al2O3 additions on steel-to-concrete bonding

Cited by 62 publications

References 18 publications

New Trends for Reinforced Concrete Structures: Some Results of Exploratory Studies

New Trends for Reinforced Concrete Structures: Some Results of Exploratory Studies

Nano-Inclusions Applied in Cement-Matrix Composites: A Review

Admixtures in Cement-Matrix Composites for Mechanical Reinforcement, Sustainability, and Smart Features

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