Durability of Silica Fume Concrete Exposed to Chloride in Hot Climates

Smith, B. G.

doi:10.1061/(asce)0899-1561(2001)13:1(41)

Cited by 29 publications

(12 citation statements)

References 2 publications

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“…Poor quality of concrete combined with aggressive environmental conditions has exposed inadequacies in design: some structures have had alarming degrees of degradation within less than a decade [8]. Application of supplementary cementitious materials (SCM) such as silica fume (SF) and fly ash (FA) to extend the service life of infrastructures has significantly increased in Iranian concrete practices of recent decades [9,10].…”

Section: Introductionmentioning

confidence: 99%

Long-term chloride diffusion in silica fume concrete in harsh marine climates

Shekarchi

Rafiee

Layssi

2009

Cement and Concrete Composites

117

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Section: Introductionmentioning

confidence: 99%

Long-term chloride diffusion in silica fume concrete in harsh marine climates

Shekarchi

Rafiee

Layssi

2009

Cement and Concrete Composites

117

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“…Smith (2001) [52] apresentou modelos preditivos para concretos com sílica ativa e diferentes tipos de cimento, expostos a um ambiente marinho agressivo, o Golfo Pérsico. Na fase de projeto, o D 0 pode ser determinado aos 90 dias em laboratório e atualizado quanto ao tempo e temperatura, porém o modelo também propõe equações para calcular o D 0 para diferentes tipos de concreto.…”

Section: Coeficiente De Difusão Influenciado Pelo Tempo E Pela Temper...unclassified

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 2

2022

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RESUMO Vários modelos para predição de vida útil de estruturas de concreto armado simulam o ingresso de agentes agressivos, como os cloretos, geralmente baseados em leis de difusão modificadas ou em propostas de transporte de multi espécies, considerando diversos parâmetros. Sua aplicação pode aprimorar a eficiência e a otimização do projeto e da vida útil em serviço de estruturas em concreto armado. O presente artigo contempla a parte 2 de resultados de uma Revisão Sistemática da Literatura (RSL) com o objetivo de descrever, analisar e classificar os modelos selecionados em determinísticos ou probabilísticos e em empíricos, analíticos e/ou numéricos. Como resultado, observou-se que a maioria dos modelos considerados é baseada na Segunda Lei de Fick, modificada ou não. Além disso, 72% deles são analíticos. Entre os probabilísticos, o método numérico mais utilizado foi a simulação de Monte Carlo. Adicionalmente, outras análises foram realizadas, como os métodos para o cálculo do coeficiente de difusão (D), os teores críticos (Ccr) utilizados, a forma de consideração da não saturação do concreto, fixação de cloretos, fissuras, a direção de penetração dos cloretos, entre outros. Apesar de todos os modelos serem uma simplificação da realidade, trazendo algumas ponderações e limitações, observou-se uma evolução dessas ferramentas para maiores níveis de complexidade.

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“…In addition, the concrete cover can avoid the direct scouring of the concrete by water flow with sediments. To date, the main antiabrasion materials are high-strength concrete [1], such as steel fiber-reinforced concrete [2][3][4][5][6][7] and silicon powder concrete; multicomponent cementitious materials concrete [8][9][10][11], while adding an active admixture, such as I or II fly ash and silicon powder [12][13][14][15] and adding fibers producing antiabrasion concrete [16][17][18][19][20]; fly ash concrete [21][22][23][24][25]; and new types of concrete covers, such as epoxy slurry, epoxy coating, polyurea, and polyurethane elastic-coating materials, as well as other concrete coating materials [26].…”

Section: Research Progressmentioning

confidence: 99%

Hydraulic Abrasion-Resistant Elastic Epoxy Resin Materials

Zhang

Liu

2019

Advances in Materials Science and Engineering

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The abrasion of hydraulic concrete structures caused by the washing action of flowing water is a common problem and cannot be solved by simply increasing the strength of the concrete. To ensure safe operation, increase in service life and reduction of maintenance costs of hydraulic concrete structures and the development of abrasion-resistant materials are required. In this work, polyurethane-modified epoxy resin was synthesized using the interpenetrating network technology (IPN). After many mixing experiments, the ratio of polyether amine to alicyclic amine in Component B was determined to be 29 : 14 and the ratio of Component A to Component B was 7 : 3. With these ratios, elastic epoxy achieved a tensile strength of more than 15 MPa and an elongation rate of more than 20%, thus balancing strength and toughness. The effects of the curing conditions, the ratio of Component A to Component B, and diluents and fillers on tensile strength and elongation of the elastic epoxy resin were analyzed. The results of the analysis indicated that the curing duration should be over 7 days, the optimal proportion of Component A to Component B should be 7 : 3, and the diluent of the elastic epoxy material should be the bifunctional butanedioldiglycidyl ether (622). The reliability of this material was determined by pull-out testing, adhesion, and tensile strength testing. The underwater steel ball test and ring test were adopted as the abrasion-resistance tests for the elastic epoxy resin material. The results showed that the abrasion-resistance performance of elastic epoxy coating improved hundreds of times over that of common concrete. Although the wearing strength was reduced with pressure, the elastic epoxy coating still retained excellent abrasion-resistance performance. At last, future application prospects of elastic epoxy improvement products are introduced and need further reach.

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Durability of Silica Fume Concrete Exposed to Chloride in Hot Climates

Cited by 29 publications

References 2 publications

Long-term chloride diffusion in silica fume concrete in harsh marine climates

Long-term chloride diffusion in silica fume concrete in harsh marine climates

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 2

Hydraulic Abrasion-Resistant Elastic Epoxy Resin Materials

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