Evaluation of the pore solution of concretes with mineral additions subjected to 14 years of natural carbonation

Cascudo, O.; Pires, Plínio; Carasek, H.; Castro, Alexandre de; Lopes, Anne

doi:10.1016/j.cemconcomp.2020.103858

Cited by 28 publications

(24 citation statements)

References 32 publications

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“…This causes a reduction in the pH-value of the paste pore solution [ 143 ]. The addition of RHA as a substitute to the clinker phase in concrete decreased the amount of CH on the one hand but provided better resistance to carbonation at the same time [ 144 , 145 , 146 , 147 ]. Lower carbonation coefficients were reported when RHA was used to replace cement at 20 wt.% and, a further decrease was obtained when 1 wt.% K 2 SO 4 was added to the mixture as a chemical activator [ 144 ].…”

Section: Durability Propertiesmentioning

confidence: 99%

“…This was attributed to lower cement content in the system and higher porosity [ 118 ] allowing more CO 2 to penetrate into the concrete. This could perhaps be due to the treatment given to the RHA or because the pore solution under the carbonation process is yet to be consolidated, as the result of the accelerated method adopted [ 146 ]. The authors were not aware of literature on the effect of RHA on the carbonation resistance of SCC.…”

Section: Durability Propertiesmentioning

confidence: 99%

“…Similar results were reported by [ 151 , 152 ]. On the other hand, a slight decrease of pH values compared to the control specimens was observed when MK was used to substitute cement at 10 wt.% and subjected to 14 years of natural carbonation [ 146 ].…”

Section: Durability Propertiesmentioning

confidence: 99%

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Suitability of Blending Rice Husk Ash and Calcined Clay for the Production of Self-Compacting Concrete: A Review

2021

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One principal approach to achieve self-compacting properties is the increased amount of finer constituents of the mixture. This, in turn, increases cement consumption leading to higher greenhouse gas emissions. Pozzolanic materials, like rice husk ash or calcined highly kaolinitic clays, have gained increased attention as supplementary cementitious materials in self-compacting concrete production. These materials could be viable alternative supplementary cementitious materials for sub-Saharan Africa which already lacks fly ash, slag and silica fume. This current effort reviews the impact of rice husk ash and calcined clays for the production of self-compacting concrete. Special focus is on their impact on rheological, mechanical and durability properties of self-compacting concrete. Rice husk ash and, in particular, calcined highly kaolinitic clays are introduced as technical and cost-effective supplementary materials for use in self-compacting. The review disclosed a lack of knowledge when it comes to the use of low-kaolinitic calcined clays as sole SCM or together with rice husk ash, which could be a very promising combination for e.g., several countries in Africa. Further studies are needed on the rheological properties, shrinkage, creep, and durability of self-compacting concrete produced with other calcined common clays and their blend with rice husk ash.

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Section: Durability Propertiesmentioning

confidence: 99%

Section: Durability Propertiesmentioning

confidence: 99%

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Suitability of Blending Rice Husk Ash and Calcined Clay for the Production of Self-Compacting Concrete: A Review

2021

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“…From the results of the electrical resistivity, it is possible to estimate the tortuosity of the pores of a concrete. It is given by the expression of Equation ( 4) [14]:…”

Section: Electrical Resistivitymentioning

confidence: 99%

Durability of Lightweight Concrete Using Oil Palm Shell as Aggregates

Traore¹,

Messan²,

Hannawi³

et al. 2021

OJCE

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Oil Palm Shell (OPS) concrete can be used in different fields of construction. To determine more accurately the fields of application, it is important to know and understand the behaviour of OPS concrete over the long term and when it is in aggressive environments. This paper presents the results of studies conducted on the durability of OPS concrete. Water absorption capacity, electrical resistivity and apparent diffusion of chloride ions have been measured on different concrete samples. In addition, the behaviour of OPS concretes to carbonation was studied in an environment rich in carbon dioxide. Results show that OPS concrete has an absorptivity of 0.97 kg/m 2 •h 1/2 , an electrical resistivity of 64.37 Ω•m and an apparent diffusion coefficient of chloride ions of 3.84 × 10 −12 m 2 /s after 90 days. All these results of OPS concrete are very close to those of concrete with normal aggregate and other lightweight concrete, which mean OPS concretes have globally good properties with regard to durability.

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“…[6,7]. Nesse sentido, vários autores vêm consolidando esses resultados, avaliando a influência da relação água/cimento, da espessura de cobrimento, das condições de moldagem e cura e da presença de adições minerais na solução dos poros e na durabilidade do concreto de cobrimento por meio de diferentes métodos [8][9][10][11][12][13][14][15][16]. O estudo dos mecanismos de transporte desses agentes agressivos é fundamental para indicar a qualidade do concreto de cobrimento, ajudando a quantificar a penetrabilidade desses agentes agressivos e auxiliando na previsão da resistência do concreto à deterioração [17,18].…”

Section: Introductionunclassified

Modelos preditivos de vida útil de estruturas de concreto sujeitas à iniciação da corrosão de armaduras por cloretos: contribuição ao estado da arte por meio de revisão sistemática da literatura – Parte 1

2022

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RESUMO A modelagem da penetração de agentes agressivos no concreto pode melhorar a qualidade de projetos e concorrer para uma especificação otimizada de concretos, contribuindo assim com a previsibilidade comportamental da estrutura, aspecto este muito importante para assegurar condições de serviço adequadas durante o uso, operação e manutenção das estruturas de concreto. Contribuir para o cumprimento de vida útil, minimizando custos de manutenção e riscos aos usuários, é papel desse tipo de estudo, que colabora com a concepção de estruturas duráveis, baseada em desempenho, voltando-se ao controle da corrosão da armadura induzida por cloretos. São diversos os modelos preditivos de vida útil existentes em escala mundial, porém eles se apresentam de forma difusa e heterogênea, o que dificulta sua compreensão e consequente aplicação. O presente trabalho contribui, então, com a realização uma Revisão Sistemática da Literatura (RSL) com o objetivo de identificar os principais modelos utilizados mundialmente, considerando uma abordagem que vai até a etapa de iniciação da corrosão induzida por cloretos. A pesquisa foi realizada em quatro bases de dados, quais sejam: Engineering Village, Science Direct, Scopus e Web of Science. Após exclusão em diferentes fases (título, resumo, busca dos artigos completos e leitura), permaneceram 50 publicações, nas quais foi realizado um levantamento bibliométrico com diversas informações (autores, instituições, países e palavras-chave). Observou-se que a maioria dos modelos preditivos identificados é baseada na difusão de cloretos, conforme a Segunda Lei de Fick, com ou sem modificações pela solução de Crank. Os modelos preditivos mais citados foram a Segunda Lei de Fick e o Life-365, como forma de prever o tempo de início de corrosão e, consequentemente, a vida útil das estruturas de concreto.

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Evaluation of the pore solution of concretes with mineral additions subjected to 14 years of natural carbonation

Cited by 28 publications

References 32 publications

Suitability of Blending Rice Husk Ash and Calcined Clay for the Production of Self-Compacting Concrete: A Review

Suitability of Blending Rice Husk Ash and Calcined Clay for the Production of Self-Compacting Concrete: A Review

Durability of Lightweight Concrete Using Oil Palm Shell as Aggregates

Modelos preditivos de vida útil de estruturas de concreto sujeitas à iniciação da corrosão de armaduras por cloretos: contribuição ao estado da arte por meio de revisão sistemática da literatura – Parte 1

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