Study of alkali-activated mortar used as conventional repair in reinforced concrete

Geraldo, Rodrigo H.; Teixeira, Otacisio Gomes; Matos, Samile Raiza Carvalho; Silva, Francisco G.S.; Gonçalves, Jardel Pereira; Camarini, Gladis

doi:10.1016/j.conbuildmat.2018.01.063

Cited by 27 publications

(15 citation statements)

References 22 publications

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“…1 that the strengthening system was able to improve the load performance of the RC beam at varying levels. For instance, in the study of Geraldo et al [14], an increase of 12% in the peak load was reported on an undamaged RC beam strengthened by PG. Likewise, PG repair system increased the peak load of a partially damaged RC beam by 11% [15].…”

Section: Performance Of Geopolymer-strengthened Concrete Beammentioning

confidence: 95%

“… Repair technique reduced the flexural and shear cracks crack distribution in the beam. [14] 150x200x2000…”

Section: Performance Of Geopolymer-strengthened Concrete Beammentioning

confidence: 99%

“…Therefore, in order to restore the existing RC beam to its functional use, it is recommended that the rehabilitation using PG material should be done at the initial stage of damage, as emphasized in the study [15]. With regard to the ductility and rigidity of the PG-repaired RC beams, it was reported that they exhibited better performance compared to that of the control specimens [14]. One common observation highlighted from these studies is that the failure type of PG-strengthened RC beam is similar to that of the control RC beam whereby the first crack usually occurred at the tensile side (i.e.…”

Section: Performance Of Geopolymer-strengthened Concrete Beammentioning

confidence: 99%

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Structural Performance of Concrete Elements Retrofitted by a Geopolymer Strengthening System: Input in the Rehabilitation of Historical Buildings

Guades¹,

Stang²

2019

WIT Transactions on the Built Environment

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Rehabilitation of historic buildings is a priority since their structural elements suffered from various levels of damage that took place during their service life. Recently, geopolymer is gaining acceptance as an emerging material in the construction industry due to its added advantages. It has shown excellent bond strength to concrete substrate, lower creep and shrinkage, greater durability in severe environments and higher temperature and fire resistance. Geopolymer is relatively new in the rehabilitation system of building structures, although it had been used for new construction applications. Therefore, an effort was made to gather information on the use of geopolymer as repair and strengthening material. This paper reviewed the structural performance of geopolymer-strengthened concrete elements and the field applications of geopolymer as strengthening material for historical buildings. Information from the literature revealed that the load capacity of the non-damaged and fully damaged reinforced concrete (RC) beam can be increased by 12% and 100%, respectively, when strengthened using plain geopolymer. It was found that short fiber-reinforced geopolymer (SFRG) strengthening system enhanced the peak load of RC beam by 15% while 370% if using continuous fiber-reinforced geopolymer (CFRG). To date, field applications of geopolymer strengthening system on historical buildings were limited, nevertheless this technique provided good structural performance making it suitable in the rehabilitation process.

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Section: Performance Of Geopolymer-strengthened Concrete Beammentioning

confidence: 95%

“… Repair technique reduced the flexural and shear cracks crack distribution in the beam. [14] 150x200x2000…”

Section: Performance Of Geopolymer-strengthened Concrete Beammentioning

confidence: 99%

Section: Performance Of Geopolymer-strengthened Concrete Beammentioning

confidence: 99%

See 1 more Smart Citation

Structural Performance of Concrete Elements Retrofitted by a Geopolymer Strengthening System: Input in the Rehabilitation of Historical Buildings

Guades¹,

Stang²

2019

WIT Transactions on the Built Environment

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“…Hamzah et al [ 17 ] reported the highest strength of GPMs was achieved with specimens’ mortar prepared with a ratio of 0.40 of alkaline solution to binder content at 28 days of age. Therefore, GPMs are well-suited and sustainable repair materials that can be applied as pastes for crack injections, mortar for section restoration, or patch repairs [ 18 , 19 , 20 , 21 , 22 ]. Several reports [ 23 , 24 , 25 , 26 ] suggested the preferred uses of FA alkali-activated mortars that include GBFS in the standard concrete repairing material.…”

Section: Introductionmentioning

confidence: 99%

Effects of Sulfate and Sulfuric Acid on Efficiency of Geopolymers as Concrete Repair Materials

Alyousef

Ebid

Huseien

et al. 2022

Gels

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Various geopolymer mortars (GPMs) as concrete repairing materials have become effective owing to their eco-friendly properties. Geopolymer binders designed from agricultural and industrial wastes display interesting and useful mechanical performance. Based on this fact, this research (experimental) focuses on the feasibility of achieving a new GPM with improved mechanical properties and enhanced durability performance against the aggressive sulfuric acid and sulfate attacks. This new ternary blend of GPMs can be achieved by combining waste ceramic tiles (WCT), fly ash (FA) and ground blast furnace slag (GBFS) with appropriate proportions. These GPMs were designed from a high volume of WCT, FA, and GBFS to repair the damaged concretes existing in the construction sectors. Flexural strength, slant shear bond strength, and compatibility of the obtained GPMs were compared with the base or normal concrete (NC) before and after exposure to the aggressive environments. Tests including flexural four-point loading and thermal expansion coefficient were performed. These GPMs were prepared using a low concentration of alkaline activator solution with increasing levels of GBFS and FA replaced by WCT. The results showed that substitution of GBFS and FA by WCT in the GPMs could enhance their bond strength, mechanical characteristics, and durability performance when exposed to aggressive environments. In addition, with the increase in WCT contents from 50 to 70%, the bond strength performance of the GPMs was considerably enhanced under sulfuric acid and sulfate attack. The achieved GPMs were shown to be highly compatible with the concrete substrate and excellent binders for various civil engineering construction applications. It is affirmed that the proposed GPMs can efficiently be used as high-performance materials to repair damaged concrete surfaces.

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“…A formulação de álcalis ativados representam uma alternativa ambientalmente amigável e com características de reparo e durabilidade melhores quando comparado aos materiais a base de Cimento Portland (XU et al, 2018;GERALDO et al, 2018). Dessa forma, com intuito de conhecer e analisar as propriedades no estado fresco, no estado endurecido e aspectos relacionados ao desempenho referente a absorção de água, caracterizou-se um material álcali ativado de cinza volante e metacaulim flint, a fim de inferir o seu potencial uso no reparo de estruturas de concreto armado.…”

Section: Introductionunclassified

Ligante Ativado Por Álcali À Base De Cinza Volante E Metacaulim Flint Como Material De Reparo Para Estruturas De Concreto Armado

Ribeiro¹,

Campos²,

Brito³

et al. 2020

≫Congresso Brasileiro De Patologia Das Construções

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A exposição intensa das estruturas de concreto a situações inadequadas e ausência de manutenção podem conduzir a perigos potenciais, fazendo-se necessário ações de reforços e reparos para garantir a segurança e a durabilidade. No entanto, o impacto das soluções atualmente empregadas resulta na busca por opções mais sustentáveis. Este artigo relata a caracterização de um material álcali ativado à base de cinza volante e metacaulim Flint, a fim de inferir o seu potencial uso no reparo de estruturas de concreto. O estudo das propriedades reológicas e mecânicas sugerem que o ligante álcali ativado de cinza volante e metacaulim possui tempo de pega e resitências mecânicas adequadas para a aplicação em reparos rápidos em estruturas de concreto, sendo uma opção para os atuais materiais de reparo, além de representar uma solução socioeconômica e sustentável para os efeitos da cadeia de uma energia mais limpa e de custos adicionais na exploração mineral.

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Study of alkali-activated mortar used as conventional repair in reinforced concrete

Cited by 27 publications

References 22 publications

Structural Performance of Concrete Elements Retrofitted by a Geopolymer Strengthening System: Input in the Rehabilitation of Historical Buildings

Structural Performance of Concrete Elements Retrofitted by a Geopolymer Strengthening System: Input in the Rehabilitation of Historical Buildings

Effects of Sulfate and Sulfuric Acid on Efficiency of Geopolymers as Concrete Repair Materials

Ligante Ativado Por Álcali À Base De Cinza Volante E Metacaulim Flint Como Material De Reparo Para Estruturas De Concreto Armado

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