Influence of nano-SiO2 and nano-Al2O3 additions on the shear strength and the bending moment capacity of RC beams

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

doi:10.1016/j.conbuildmat.2016.06.132

Cited by 33 publications

(19 citation statements)

References 14 publications

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“…Nano-materials, as a novel modified additive, have different physical and chemical properties due to their nanometer-level dimension. Study on the mechanical performance of concrete incorporated with nanoparticles as modified additives has been highlighted in previous literatures (Zhang, Wang, and Zhang 2011;Li et al 2015;Silva et al 2016;Ma et al 2016). Currently, increasing attention has been devoted into the durability of concrete with nano-particles.…”

Section: Introductionmentioning

confidence: 99%

Experimental study on ASR performance of concrete with nano-particles

Zhang

Xie

2019

Journal of Asian Architecture and Building Engineering

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Alkali-silica reaction (ASR) is a serious durability problem, resulting in significant maintenance and reconstruction cost of concrete infrastructure all over the world, so more and more attention has been attracted to it. This paper tends to discuss whether nano-SiO 2 and nano-Fe 2 O 3 can mitigate the concrete deterioration caused by ASR. The test results show that the concretes with nano-particles have lower expansion and higher sonic velocity. Therefore, it is an available method for concrete to mix with nano-particles to mitigate ASR and the optimum content of nano-SiO 2 and nano-Fe 2 O 3 in concrete is 2.0% and 1.0%, respectively. The mitigating mechanism is revealed through the effect of mixing water on the porosity.

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Section: Introductionmentioning

confidence: 99%

Experimental study on ASR performance of concrete with nano-particles

Zhang

Xie

2019

Journal of Asian Architecture and Building Engineering

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“…The last two decade ultra high performance concrete is becoming the most promising type of concrete and having a superior mechanical and durability performance [1]- [3]. The utilization of nanomaterials in UHPC is highly effective SCM for cement matrix [4]- [9]. This is due to very small size, nanoparticles will fill the pores in the cement matrix, that leads to improving packing density and microstructural properties.…”

Section: Introductionmentioning

confidence: 99%

The effects of nano – Al2O3 particles replacement on abrasion resistance property of ultra high performance concrete

Preeth¹,

Mahendran²

2019

IJRTER

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In the present investigation, the abrasion resistance of ultra high performance concrete (UHPC) containing nano Al 2 O 3 particles have been investigated at an age of 28 th , 56 th and 90 th days. The cement was partially replaced by 0.5%, 1%, 1.5%, 2% and 3% nano Al 2 O 3. The results were revealed that increasing the nano Al 2 O 3 particles have found to be reducing the loss in mass and average loss in thickness of ultra high performance concrete, due to better packing of nano Al 2 O 3 was reduced the porosity.

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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%

Section: Structures Made With Nanoconcretementioning

confidence: 99%

“…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]. The strength capacity of beams with nanoparticles was evaluated by testing 16 reinforced concrete beams (Figure 7e,f) [40]. Based in these studies, the following conclusions were drawn: (i) Adding nanoparticles to the concrete mixture influences mostly the adhesion component, which is particularly relevant when plain rebars are used.…”

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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Influence of nano-SiO2 and nano-Al2O3 additions on the shear strength and the bending moment capacity of RC beams

Cited by 33 publications

References 14 publications

Experimental study on ASR performance of concrete with nano-particles

Experimental study on ASR performance of concrete with nano-particles

The effects of nano – Al2O3 particles replacement on abrasion resistance property of ultra high performance concrete

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

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