The role of concrete compressive strength on the service life and life cycle of a RC structure: Case study

Garcez, Mônica Regina; Röhden, Abrahão Bernardo; Godoy, Luis Gabriel Graupner de

doi:10.1016/j.jclepro.2017.10.153

Cited by 28 publications

(18 citation statements)

References 26 publications

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“…As distâncias de transporte consideradas nesse estudo, mostradas na Tabela 2, referem-se a um cenário de construção em uma cidade de tamanho médio (496,8 km², 1,5 milhões de habitantes) no sul do Brasil [12]. Na análise foi utilizado o modelo cut-off, que considera que a produção primária de materiais é sempre alocada ao usuário primário do material.…”

Section: Metodologiaunclassified

Influência De Variações De Modelo Estrutural E Vida Útil De Projeto Nos Impactos Ambientais Gerados Por Edifícios De Concreto Armado

Cassinelli¹,

Godoy²,

Garcez³

et al. 2020

≫Congresso Brasileiro De Patologia Das Construções

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Em tempos em que o uso consciente de materias é prioridade em muitas áreas da produção de bens e seviços, a engenharia civil está ainda aquém do seu potencial, visto que a atividade gera altos impactos ambientais, principalmente relacionados aos níveis de emissões de poluentes. Entretanto, por meio do uso de técnicas construtivas e estratégias de projeto, podese amenizar o impacto ambiental gerado pelas edificações. O uso de diferentes sistemas de lajes, por exemplo, pode reduzir o consumo de materiais em edifícios de concreto armado. Por outro lado, há também a possibilidade de aumentar a vida útil de projeto dos edifícios de concreto armado. Desta forma, este estudo propõe uma avaliação da influência de variações de modelo estrutural e vida útil de projeto nos impactos ambientais gerados por edifícios de concreto armado. Os impactos ambientais das diferentes estratégias de projeto estudadas são avaliados pelos resultados de uma Análise de Ciclo de Vida, considerando a produção e transporte dos materiais, a construção da estrutura, e, finalmente o desmonte e descarte, que corresponde ao final do ciclo de vida da estrutura. Os resultados encontrados contribuem para a consolidação de abordagens contemporâneas que sugerem a necessidade de incorporar o grau de impactos ambientais nos projetos estruturais de edifícios de concreto armado. Palavras-chave: emissão CO2, modelos estruturais, vida útil, ciclo de vida, concreto armado.

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Section: Metodologiaunclassified

Influência De Variações De Modelo Estrutural E Vida Útil De Projeto Nos Impactos Ambientais Gerados Por Edifícios De Concreto Armado

Cassinelli¹,

Godoy²,

Garcez³

et al. 2020

≫Congresso Brasileiro De Patologia Das Construções

View full text Add to dashboard Cite

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“…However, the benefit of studying the member or a whole structure in which the concrete mix would be a part adds is that it another important factor to the equation, which is the optimization of the total volume. For example, increasing the prescribed strength requirement for concrete from 25 MPa to 50 MPa in a solid slab building would decrease the volume of concrete needed by around 15%, especially with columns [28]. It is recommended, therefore, to run a parametric analysis on the concrete under study based on compressive strength, strength, service life and the resulting volume, and hence, the combined environmental impact.…”

Section: Figurementioning

confidence: 99%

A Systematic Review of the Discrepancies in Life Cycle Assessments of Green Concrete

et al. 2019

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It is challenging to measure the environmental impact of concrete with the absence of a consensus on a standardized methodology for life cycle assessment (LCA). Consequently, the values communicated in the literature for “green” concrete alternatives vary widely between 84 and 612 kg eq CO2/m3. This does not provide enough evidence regarding the acclaimed environmental benefits compared to ordinary Portland cement concrete knowing that the average for the latter was concluded in this study to be around 370 kg eq CO2/m3. Thus, the purpose of this study was to survey the literature on concrete LCAs in an attempt to identify the potential sources of discrepancies and propose a potential solution. This was done through examining 146 papers systematically and attributing the sources of error to the four stages of an LCA: scope definition, inventory data, impact assessment and results interpretations. The main findings showed that there are 13 main sources of discrepancies in a concrete LCA that contribute to the incompatibility between the results. These sources varied between (i) user-based choices such as depending on a cradle-to-gate scope, selecting a basic volume-based functional unit and ignoring the impact allocation and (ii) intrinsic uncertainty in some of the elements, such as the means of transportation, the expected service life and fluctuations in market prices. The former affects the reliability of a study, and hence, a concrete LCA methodology should not allow for any of the uncertainties. On the other hand, the latter affects the degree of uncertainty of the final outcome, and hence, we recommended conducting scenario analyses and communicating the aggregated uncertainty through the selected indicators.

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“…Therefore, the investigation of concrete mechanical properties is very crucial in designing concrete structures. In which, compressive strength is the most important property because the compressive strength is directly influenced by the safety and performance of the structure during the whole life-cycle for both old and new structures [1]. Nonetheless, concrete is created by different components such as aggregates, cement, supplementary cementitious materials, additional mixtures, which are all randomly distributed in the concrete matrix.…”

Section: Introductionmentioning

confidence: 99%

Investigation of ANN architecture for predicting the compressive strength of concrete containing GGBFS

et al. 2021

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An extensive simulation program is used in this study to discover the best ANN model for predicting the compressive strength of concrete containing Ground Granulated Blast Furnace Slag (GGBFS). To accomplish this purpose, an experimental database of 595 samples is compiled from the literature and utilized to find the best ANN architecture. The cement content, water content, coarse aggregate content, fine aggregate content, GGBFS content, carboxylic type hyper plasticizing content, superplasticizer content, and testing age are the eight inputs in this database. As a result, the optimal selection of the ANN design is carried out and evaluated using conventional statistical metrics. The results demonstrate that utilizing the best architecture [8–14–4–1] among the 240 investigated architectures, and the best ANN model, is a very efficient predictor of the compressive strength of concrete using GGBFS, with a maximum R2 value of 0.968 on the training part and 0.965 on the testing part. Furthermore, a sensitivity analysis is performed over 500 Monte Carlo simulations using the best ANN model to determine the reliability of ANN model in predicting the compressive strength of concrete. The findings of this research may make it easier and more efficient to apply the ANN model to many civil engineering challenges.

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The role of concrete compressive strength on the service life and life cycle of a RC structure: Case study

Cited by 28 publications

References 26 publications

Influência De Variações De Modelo Estrutural E Vida Útil De Projeto Nos Impactos Ambientais Gerados Por Edifícios De Concreto Armado

Influência De Variações De Modelo Estrutural E Vida Útil De Projeto Nos Impactos Ambientais Gerados Por Edifícios De Concreto Armado

A Systematic Review of the Discrepancies in Life Cycle Assessments of Green Concrete

Investigation of ANN architecture for predicting the compressive strength of concrete containing GGBFS

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