A study on the flexural behavior of sustainable concrete beams with high volume fly ash

Joanna, P. S.; Parvati, T.S.; Rooby, Jessy; Preetha, R.

doi:10.1016/j.matpr.2020.07.343

Cited by 5 publications

(3 citation statements)

References 9 publications

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“…For MLS, when 30% and 30% of cement was replaced with FA and GGBFS, respectively, the strength development from Days 1 to 7 was approximately 33.9% higher than when 20% and 20% of cement were replaced with FA and GGBFS, respectively. This phenomenon was mainly because of the effects of FA, which increased strength develop-ment [44]. Nevertheless, at a curing period of 56 days, a change in the ratio of SCM that replaced cement did not result in a significant change in flexural strength [45][46][47][48].…”

Section: Hvfgc Mechanical Behavior To Flexural Strengthmentioning

confidence: 99%

Properties and Mechanical Strength Analysis of Concrete Using Fly Ash, Ground Granulated Blast Furnace Slag and Various Superplasticizers

Juang

Kuo

2023

Buildings

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Supplementary cementitious materials (SCMs) have been widely used to replace cement in recent years in order to reduce the burden of cement on the environment. In this study, fly ash (FA) and ground-granulated blast furnace slag (GGBFS) were used as long-term 40%, 50% and 60% replacement cement in order to explore the mechanical strength of different superplasticizers (SPs) under high substitution amounts. The results of the study showed that, in terms of the nature of work, when 60% of cement was replaced with SCM, the initial setting time was increased by 40–70 min. The values of the ratio of the initial to final setting time (I/F ratio) are equivalent when the I/F values of PCE and SNF are at W/B = 0.27 and 0.35, and at the lowest W/B (0.21) in this study, the I/F calculation result was the difference between PCE and MLS. The I/F value is equal, which means that when the W/B is low, PCE and MLS have the same impact on workability, and as W/B increases, the impact of PCE and SNF is similar. In terms of compressive strength, W/B = 0.21. The 1-day curing age of PCE was compared with the 91-day curing age, and it was found that at high volumes of replacement, increasing GGBFS by 10% can increase the strength by 37%. Using the ultrasonic wave velocity as the input value and the compressive strength result as the output value, the MATLAB back propagation neural network prediction model was carried out. The best correlation coefficient R value of MLS was 0.97, and the mean squared error was 2.21, which has good prediction ability.

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Section: Hvfgc Mechanical Behavior To Flexural Strengthmentioning

confidence: 99%

Properties and Mechanical Strength Analysis of Concrete Using Fly Ash, Ground Granulated Blast Furnace Slag and Various Superplasticizers

Juang

Kuo

2023

Buildings

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“…The studies aim the search for alternative materials and a lower generation of pollutants for the construction of environmentally sustainable buildings. As an example of the search for viable economic, technical, and environmental solutions for the manufacture of concrete, there is the study developed by Rajan et al [20], which investigates the addition of rubber waste from naturally treated tires for partial replacement of fine aggregate; the study by Verma et al [21], which seeks efficient solutions in the use of silica fume and stone dust in partial replacement of cement and fine aggregate; the work of Joanna et al [22], which uses fly ash to replace cement in the manufacture of concrete; and the study by Majhi and Nayak [23] that uses blast furnace slag of high aggregated volume and recycled with lime activator, in partial or total replacement of the natural aggregate.…”

Section: Life Cycle Assessmentmentioning

confidence: 99%

Optimized sizing of reinforced concrete structural elements considering the effect of carbonation

Alievi

Santoro

Kripka

2022

Rev. IBRACON Estrut. Mater.

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The environmental impact of reinforced concrete structures occurs during all phases of the building's life cycle, with emphasis on the stages of extraction and transport of raw materials and concrete production. An effective way to reduce the impact of these structures is to reduce the consumption of materials with the use of optimization techniques. The present study evaluates carbon dioxide emissions of concrete with two different compressive strengths for the region of Chapecó, SC. With these data, the optimization of structural elements was performed aiming to minimize their environmental impact. The carbonation of optimized elements was also evaluated. Among the results, it was observed that concretes with lower strength have better CO2 absorption rates (for the elements analyzed 20MPa concrete absorbed about 90% and 112% more CO2 than 35MPa concrete to columns and beams, respectively). In addition, it was observed that local factors can strongly influence the impacts, with the transport of materials reaching up to 6.4% of total emissions.

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“…The flexural performance of concrete beams was performed while using a high volume of FA in several kinds of research. Joanna et al (Joanna et al, 2020) found that the moment capacity of 50% cement-replaced FA beams is slightly more than that of the control specimens after 56 days. The strain, deflection, crack load, yield load, and ultimate load are also found to be almost similar to the content in FA (Amiri et al, 2016;Chinh, 2021;Fuzail Hashmi et al, 2020;Yoo et al, 2015).…”

Section: Introductionmentioning

confidence: 96%

Physical, Mechanical, and Durability Properties of Concrete with Class F Fly Ash

Islam,

Ahmed,

Salehin

et al. 2023

MIJST

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Concrete is one of the most used manufactured materials in the world. Fly ash (FA) is a byproduct produced from pulverized coal combustion in power generation. A total of 0.08 million tons of class F fly ash is produced from a coal-based power plant yearly in Barapukuria, Bangladesh, whose disposal is of a great issue. Therefore, this study aims to explore the possibility of using class F FA in concrete construction as a supplementary cementitious material. In this study, two different water-to-cement ratios (0.4 and 0.5), each with five cement replacement levels numerically, 0%, 10%, 20%, 30%, and 40% with FA are used. Various tests are performed on cylinder and beam specimens to assess physical, mechanical, and durability properties, such as workability, density, compressive strength (CS), splitting tensile strength (STS), flexural strength (FS), chloride ion penetrability (CIP), and shrinkage. Analyzing the results, it is reported that workability increases and density decreases with the increasing FA replacement. Mechanical properties mostly decrease with increasing FA content. However, the strength gained with age is higher for concrete with FA compared to the control concrete. The CIP reduces with FA replacement, especially at 56 days of age. Shrinkage value reduces 82% at 40% replacement FA replacement and w/c ratio 0.4. However, at 10% FA replacement and concrete age of 56 days, mechanical strength loss is infinitesimal or even better compared to the control concrete. Thus, a low replacement percentage of FA with a high curing period is a suitable concrete cement alternative.

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A study on the flexural behavior of sustainable concrete beams with high volume fly ash

Cited by 5 publications

References 9 publications

Properties and Mechanical Strength Analysis of Concrete Using Fly Ash, Ground Granulated Blast Furnace Slag and Various Superplasticizers

Properties and Mechanical Strength Analysis of Concrete Using Fly Ash, Ground Granulated Blast Furnace Slag and Various Superplasticizers

Optimized sizing of reinforced concrete structural elements considering the effect of carbonation

Physical, Mechanical, and Durability Properties of Concrete with Class F Fly Ash

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