Key issues in the use of fibre reinforced polymer (FRP) composites in the rehabilitation and retrofitting of concrete structures

Hollaway, L.

doi:10.1533/9780857090928.1.3

Cited by 45 publications

(45 citation statements)

References 55 publications

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“…It is worth noticing that according to (Hegger et al, 1997), the increase of compressive strength in concrete would mean a reduction in the reinforced steel amount by as much as 50%. Besides, many of the degraded concrete structures were built decades ago when little attention was given to the durability issues (Hollaway, 2011). It is then no surprise to find out that worldwide, the rehabilitation of concrete infrastructure costs are staggering.…”

Section: Introductionmentioning

confidence: 99%

Durability Properties of High-Performance Concrete Incorporating Nano-TiO<sub>2</sub> and Fly Ash

Mohseni¹,

Ranjbar²,

Tsavdaridis³

2015

American Journal of Engineering and Applied Sciences

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High Performance Concrete (HPC) is a concrete that is designed to provide high strength and excellent durability. This paper investigates the hardened properties of HPC incorporating nano-TiO 2 (NT) and Fly Ash (FA). TiO 2 nanoparticles at the rates of 1, 2 and 3% and low-calcium fly ash at the rate of 30% of the binder by weight were considered. Compressive strength was conducted at the ages of 7 days as an early age and 28 days as the standard age to determine the mechanical properties of HPC incorporating FA and NT. The durability performance was assessed by means of water absorption by capillarity, ultrasonic pulse velocity, chloride diffusion and resistance to sulphuric acid attack. The results indicated that the concretes containing NT increased content show improved durability performance. Moreover, the results showed significant improvement in the properties of the samples incorporating the replacement of cement with a combination of 1% TiO 2 nanoparticles and 30% FA.

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Section: Introductionmentioning

confidence: 99%

Durability Properties of High-Performance Concrete Incorporating Nano-TiO<sub>2</sub> and Fly Ash

Mohseni¹,

Ranjbar²,

Tsavdaridis³

2015

American Journal of Engineering and Applied Sciences

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Section: Introductionunclassified

“…Alguns autores [1] referem que só nos Estados Unidos são necessários mais de 1.6 triliões de dólares para obras de reparação destas estruturas. Parte do problema está relacionado com o facto dessas estruturas terem sido construídas quando inexistiam preocupações sobre a durabilidade nem sequer mesmo um conhecimento científico sólido sobre este tema [2].Materiais com baixa durabilidade necessitam de frequentes operações de manutenção e conservação ou mesmo a sua substituição integral o que implica o consumo de matérias-primas e energia com evidente …”

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Produtos de hidratação em argamassas geopoliméricas à base de argila da Tunísia para reparação de estruturas de concreto

et al. 2016

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A reparação de estruturas degradadas de concreto representa uma oportunidade para a indústria da construção mas também um desafio para a comunidade científica. O desenvolvimento de novas argamassas de reparação constitui por isso uma importante área de investigação. Os geopolímeros são ligantes inovadores alternativos ao cimento Portland pelo que as argamassas à base destes materiais, geopolíméricas, apresentam algumas potencialidades no campo da reparação das estruturas de concreto.O presente artigo apresenta resultados de uma investigação sobre o desenvolvimento de argamassas geopoliméricas à base de uma argila da Tunísia sujeita a tratamento térmico. É incluída uma análise da argila e também dos produtos de hidratação da argamassa os quais apresentam fases geopoliméricas típicas. Palavras-chave: Estruturas de concreto, argamassas de reparação, geopolímeros, argila calcinada, metacaulim ABSTRACTThe rehabilitation of concrete structures represents an opportunity for the construction industry as well as a challenge for the scientific community. The development of new repair mortars is thus an important research area. Gopolymers are innovative binders alternative to Portland cement being that the geopolymeric mortars present some advantages concerning the repair of concrete structures. This paper presents investigations results regarding the development of gepolymeric mortars based on a calcined Tunisian clay. A characterization of the clay is included as well as of the mortars hydration products that show typical geopolymeric phases.Keywords: Concrete structures, repair mortars, geopolymers, calcined clay, metakaolin INTRODUÇÃOOs custos associados à reabilitação de estruturas de concreto a nível mundial apresentam valores astronómicos. Alguns autores [1] referem que só nos Estados Unidos são necessários mais de 1.6 triliões de dólares para obras de reparação destas estruturas. Parte do problema está relacionado com o facto dessas estruturas terem sido construídas quando inexistiam preocupações sobre a durabilidade nem sequer mesmo um conhecimento científico sólido sobre este tema [2].Materiais com baixa durabilidade necessitam de frequentes operações de manutenção e conservação ou mesmo a sua substituição integral o que implica o consumo de matérias-primas e energia com evidente

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“…Normal strength concrete produces less durable structures which require frequent maintenance and conservation operations or even complete replacement, with the associated consumption of additional raw materials and energy. Many degraded concrete structures were built decades ago at a time when little attention was given to durability (Hollaway, 2011). It is not therefore surprising that worldwide concrete infrastructure rehabilitation costs are extremely high.…”

Section: Introductionmentioning

confidence: 99%

Nanoparticles for high performance concrete (HPC)

Pacheco-Torgal

Miraldo

Ding

et al. 2013

Nanotechnology in Eco-Efficient Construction

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According to the 2011 ERMCO statistics, only 11% of the production of ready-mixed concrete relates to the high performance concrete (HPC) target. This percentage has remained unchanged since at least 2001 and appears a strange choice on the part of the construction industry, as HPC offers several advantages over normal-strength concrete, specifi cally those of high strength and durability. It allows for concrete structures requiring less steel reinforcement and offers a longer serviceable life, both of which are crucial issues in the eco-effi ciency of construction materials. Despite the growing importance of nanotechnology, investigations into the incorporation of nanoparticles into concrete are rare (100 out of 10,000 Scopus concrete-related articles published in the last decade). It therefore remains to be seen how research in this area will contribute to concrete eco-effi ciency. This chapter summarizes the state of current knowledge in the fi eld and considers the infl uence of nanoparticles on the mechanical properties of concrete and its durability. It also includes the control of calcium leaching. The problem of effi cient dispersion of nanoparticles is analyzed.

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Key issues in the use of fibre reinforced polymer (FRP) composites in the rehabilitation and retrofitting of concrete structures

Cited by 45 publications

References 55 publications

Durability Properties of High-Performance Concrete Incorporating Nano-TiO<sub>2</sub> and Fly Ash

Durability Properties of High-Performance Concrete Incorporating Nano-TiO<sub>2</sub> and Fly Ash

Produtos de hidratação em argamassas geopoliméricas à base de argila da Tunísia para reparação de estruturas de concreto

Nanoparticles for high performance concrete (HPC)

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