Influence of nano-silica addition on durability of UHPC

Ghafari, Ehsan; Arezoumandi, Mahdi; Costa, Hugo; Júlio, Eduardo

doi:10.1016/j.conbuildmat.2015.07.009

Cited by 128 publications

(37 citation statements)

References 25 publications

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“…Among other nanoparticles, nano silica (NS) ones have been widely used due to their pozzolanic (i. e., contributing to the compressive strength), seeding and filler effects, by which the enhanced mechanical properties and durability of cement‐based materials could be achieved.…”

Section: Introductionmentioning

confidence: 99%

Surface Modification of Nano-SiO₂ Particles with Polycarboxylate Ether-Based Superplasticizer under Microwave Irradiation

Huang

Wang

2017

ChemistrySelect

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The mechanical properties and durability of cement‐based materials reinforced by nano‐SiO2 (NS) particles are strongly dependent on the dispersion characteristics of the latter. This study presents an innovative eco‐friendly method, which improves the distribution of NS particles through their surface modification using polycarboxylate ether‐based (PCE) superplasticizer containing silane coupling agent under microwave irradiation. The above method ensures the formation of a core‐shell‐shell structure, wherein the PCE shell exhibits enhanced electrostatic and steric hindrance repulsion properties. Moreover, after the surface modification, an improved compatibility between NS and PCE and a higher dispersion stability of NS in the saturated calcium hydroxide solution are attained, which is proved by the respective grafting ratios and encapsulation parameters of the surface‐modified NS particles. The proposed method application guarantees an enhanced fluidity of a fresh cement paste, which makes it lucrative for the production of critical components from nano‐reinforced cement‐based materials.

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Section: Introductionmentioning

confidence: 99%

Surface Modification of Nano-SiO₂ Particles with Polycarboxylate Ether-Based Superplasticizer under Microwave Irradiation

Huang

Wang

2017

ChemistrySelect

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“…ereby, the density and strength of the material increased significantly. As compared to conventional concrete and HPC, relatively high fractions of cement are used in UHPFRC [17]. e compressive strength of UHPFRC increases with increasing cement content, up to a certain limit known as the optimum content.…”

Section: Concept Behind High Strength and Performance Of Uhpfrcmentioning

confidence: 99%

Exploitation of Ultrahigh‐Performance Fibre‐Reinforced Concrete for the Strengthening of Concrete Structural Members

Al‐Osta

2018

Advances in Civil Engineering

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e repair and strengthening of reinforced concrete members are very important due to several factors, including unexpected increases in load levels and/or the damaging impact of aggressive environmental conditions on structural concrete members. Many researchers have turned to using materials for the repair and strengthening of damaged structures or the construction of new concrete structural members. Ultrahigh-performance fibre-reinforced concrete (UHPFRC), characterized by superior structural and durability performance in aggressive environmental conditions, is one of the materials that have been considered for the repair and strengthening of concrete structural members. e repair or strengthening of concrete structures using UHPFRC needs a thorough knowledge of the behaviour of both the strengthening material and the strengthened concrete structure at service load conditions, in addition to an understanding of the design guidelines governing the use of such materials for effective repair and strengthening. In this study, the recent issues and findings regarding the use of UHPFRC as a repair or strengthening material for concrete structural members are reviewed, analysed, and discussed. In addition, recommendations were made concerning areas where future attention and research on the use of UHPFRC as a strengthening material needs to be focused if the material is to be applied in practice.

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“…The main characteristic of this UHPC is an ultra-compact matrix with reduced porosity, giving rise to an excellent performance in terms of durability and mechanical properties. The compressive strength can be higher than 150 MPa, and tests performed to assess the water absorption, corrosion rate of steel, and the porosity proved that UHPC is particularly adequate for reinforced concrete structures located in very aggressive environments [4,44]. The composition of these UHPC usually contains fibres, nanoparticles, fly ash, and a large amount of cement, between 900 and 1100 kg/m 3 , which is substantial higher than the cement dosage in normal concrete [45].…”

Section: Structures With Ultra-high Durability Concrete Covermentioning

confidence: 99%

“…Research studies [1][2][3][4][5][6] conducted by the authors in the last decade aimed at contributing to the knowledge on concrete as building material, and new types of concrete with enhanced properties were developed: lightweight aggregate concrete (LWAC) with very reduced density and high strength, ultra-high performance concrete (UHPC) with ultra-high strength and ultra-high durability, concrete incorporating different types of nanoparticles to enhance its mechanical properties, and low binder concrete (LBC) with reduced cement dosage while exhibiting adequate strength.…”

Section: Introductionmentioning

confidence: 99%

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-silica addition on durability of UHPC

Cited by 128 publications

References 25 publications

Surface Modification of Nano-SiO₂ Particles with Polycarboxylate Ether-Based Superplasticizer under Microwave Irradiation

Surface Modification of Nano-SiO₂ Particles with Polycarboxylate Ether-Based Superplasticizer under Microwave Irradiation

Exploitation of Ultrahigh‐Performance Fibre‐Reinforced Concrete for the Strengthening of Concrete Structural Members

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

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Influence of nano-silica addition on durability of UHPC

Cited by 128 publications

References 25 publications

Surface Modification of Nano-SiO2 Particles with Polycarboxylate Ether-Based Superplasticizer under Microwave Irradiation

Surface Modification of Nano-SiO2 Particles with Polycarboxylate Ether-Based Superplasticizer under Microwave Irradiation

Exploitation of Ultrahigh‐Performance Fibre‐Reinforced Concrete for the Strengthening of Concrete Structural Members

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

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Surface Modification of Nano-SiO₂ Particles with Polycarboxylate Ether-Based Superplasticizer under Microwave Irradiation

Surface Modification of Nano-SiO₂ Particles with Polycarboxylate Ether-Based Superplasticizer under Microwave Irradiation