Strength, shrinkage and creep and durability aspects of concrete including CO2 treated recycled fine aggregate

Chinzorigt, Gombosuren; Lim, Myung Kwan; Yu, Myoung-Youl; Lee, Hyuk; Enkbold, Odontuya; Choi, Dong-Uk

doi:10.1016/j.cemconres.2020.106062

Cited by 120 publications

(29 citation statements)

References 45 publications

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“…CO 2 -cured RFA and untreated RFA were compared to study the effect of both on the chloride ion permeability of RFAc, and it was found that the chloride ion permeability of RFAc prepared from CO 2 -cured RFA was higher at all substitution rates ( Figure 5 ), and the reason for the reduced chloride ion resistance of CO 2 -cured RFAc was as follows: When RFA was carbonated, chloride ions were attached as Friedl′s salt on the cement paste and then released into the pore solution, leading to an increase in chloride ion concentration. As carbonation proceeded, the chloride ion concentration in the carbonated zone increased, while the chloride ion concentration gradient in the noncarbonated zone also increased, so chloride ions entered the noncarbonated zone, leading to an increase in chloride ion concentration in the noncarbonated zone [ 88 ].…”

Section: Chloride Penetration Resistancementioning

confidence: 99%

The Durability of Recycled Fine Aggregate Concrete: A Review

Лю

Lü

et al. 2022

Materials

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With the rapid development of urbanization, many new buildings are erected, and old ones are demolished and/or recycled. Thus, the reuse of building materials and improvements in reuse efficiency have become hot research topics. In recent years, scholars around the world have worked on improving recycle aggregates in concrete and broadening the scope of applications of recycled concrete. This paper reviews the findings of research on the effects of recycled fine aggregates (RFAs) on the permeability, drying shrinkage, carbonation, chloride ion penetration, acid resistance, and freeze–thaw resistance of concrete. The results show that the content of old mortar and the quality of recycled concrete are closely related to the durability of prepared RFA concrete. For example, the drying shrinkage value with a 100% RFA replacement rate is twice that of normal concrete, and the depth of carbonation increases by approximately 110%. Moreover, the durability of RFA concrete decreases as the RFA replacement rate and the water–cement ratio improve. Fortunately, the use of zeolite materials such as fly ash, silica fume, and meta kaolin as surface coatings for RFAs or as external admixtures for RFA concrete had a positive effect on durability. Furthermore, the proper mixing methods and/or recycled aggregates with optimized moisture content can further improve the durability of RFA concrete.

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Section: Chloride Penetration Resistancementioning

confidence: 99%

The Durability of Recycled Fine Aggregate Concrete: A Review

Лю

Lü

et al. 2022

Materials

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“…The surface of waste recycled concrete aggregate is rough and includes a lot of historical mortar, so that its water absorption price is massive and range from 2.56% to 11.5% [5,6]. The water absorption of overwhelmed clay brick is greater than that of waste concrete aggregate, which is 11.14%-15.8%, due to the fact the apparent density of beaten clay brick combination is small and the porosity is excessive [4,17].…”

Section: Water Absorptionmentioning

confidence: 99%

Review on Properties of Recycled Construction Waste Concrete Aggregate

2022

AJEE

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Recycled construction waste aggregate is to solve the damage caused by construction waste to the natural environment. Through crushing, screening and other processes, the construction waste aggregate is made into reusable coarse aggregate or fine aggregate, and then replaced by natural gravel or natural sand and stone in different replacement rates and applied to the recycled aggregate in concrete. In this paper, three main physical properties of waste concrete, the old ceramic tile, broken ceramic, crushed clay brick and waste glass aggregate are summarized, which are water absorption rate, apparent density and crushing index of recycled building waste aggregate. The crushed clay brick and broken ceramic aggregate have the highest water absorption rate and low in apparent density and high in crushing index. Waste concrete mixture has excessive water absorption, low apparent density and excessive crushing index, whilst damaged ceramic tile combination has low water absorption, low apparent density and low crushing index.

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“…Observa-se que, no mínimo, dois corpos de prova foram utilizados por ensaio de fluência. Não foi possível apresentar todos os dados procedimentais do ensaio de fluência dos estudos, devido a que não indicam o método utilizado e/ou propõem outro (RAVINDRARAJAH e TAM, 1987;SATO et al, 2007;JANG e YUN, 2015;SEARA-PAZ et al, 2016;GUO et al, 2019;HE et al, 2020, CHINZORIGT et al, 2020.…”

Section: Procedimento De Ensaio De Fluênciaunclassified

“…Isso é atribuído ao teor de argamassa aderida, que reduz a qualidade dos agregados reciclados (TSUJINO et al, 2006) e a variação da relação a/c (MANZI et al, 2013). Mas também outros estudos mostraram diferentes comportamentos de fluência de concreto com ARC e relataram a influência de outros fatores (GHURAIZ et al, 2011;BRAVO et al, 2017;LV et al, 2019;CHINZORIGT et al, 2020;AKONO et al, 2021). Nesse sentido, o objetivo do presente artigo foi realizar uma revisão da literatura sobre a influência dos ARC na fluência do concreto, considerando as causas e medidas de redução.…”

Section: Introductionunclassified

Fluência de concreto com agregados reciclados: uma revisão

Rocha

Farias

2022

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A fluência é uma das propriedades mais importantes do concreto, mas o uso de Agregados Reciclados de Concreto (ARC) pode afetar significativamente essa propriedade. Neste sentido, o objetivo do presente artigo foi realizar uma revisão da literatura sobre a fluência no concreto com ARC, considerando sua influência, causas e medidas de redução. A metodologia consistiu em uma Revisão Sistemática da Literatura (RSL) para o período de tempo de 2007 até 2021 (primeiro trimestre). Foram utilizadas diferentes bases de dados de busca de informação científica, limitando-se a artigos de revista e em língua inglesa. Os resultados mostram que o Agregado Graúdo Reciclado de Concreto (AGRC) é o mais utilizado nos estudos selecionados, aumentado a fluência com o grau de substituição do agregado natural; no entanto, não há uma tendência clara com Agregado Fino Reciclado de Concreto (AFRC), cujos resultados são limitados na literatura. Apresenta-se que a fluência depende de vários fatores como a relação a/c, idade da carga, etc. Entre a principais causas, a maioria dos estudos afirma que a fluência se deve à argamassa antiga aderida ao ARC, mas também algumas medidas são propostas para reduzir a fluência no concreto com ARC. Pode-se concluir que o uso de ARC é uma alternativa sustentável para a produção de concreto, mas são necessárias mais pesquisas para entender completamente a influência do ARC na fluência do concreto e consolidar seu uso para níveis industriais.

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Strength, shrinkage and creep and durability aspects of concrete including CO2 treated recycled fine aggregate

Cited by 120 publications

References 45 publications

The Durability of Recycled Fine Aggregate Concrete: A Review

The Durability of Recycled Fine Aggregate Concrete: A Review

Review on Properties of Recycled Construction Waste Concrete Aggregate

Fluência de concreto com agregados reciclados: uma revisão

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