Experimental and numerical study of recycled aggregate concrete column

Pradhan, Subhasis; Nayak, Tusar Kumar; Kumar, Shailendra; Barai, Sudhirkumar V.

doi:10.1002/suco.202200220

Cited by 5 publications

(1 citation statement)

References 31 publications

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“…The results showed similar behavior during the loading up to failure, as well as a similar bearing capacity and the greater ductility of the samples with recycled aggregate recorded because of the slower nature of failure [12]. The axial load of recycled aggregate concrete (RAC) columns was found to be 18% lower than that of natural aggregate concrete (NAC) columns, while the axial load improved by 2.7% when the tie spacing decreased by 22.5 percent [13]. Seventeen columns (400 × 400 × 1000) were tested with various types and qualities of recycled aggregate, along with different replacement percentages of coarse aggregate (30%, 60%, and 100%), and samples with natural aggregate.…”

Section: Introductionmentioning

confidence: 60%

Experimental and Analytical Study on Recycled Aggregate RC Columns: Short and Slender Loaded Axially and Eccentrically

Najar,

Rasheed,

Taha

2024

Sustainability

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To protect the environment and preserve natural resources, it is crucial to use recycled aggregate (RA) in construction. The recycled coarse aggregate reinforced concrete columns with the addition of steel fiber evaluated under concentric and eccentric loadings for short and slender columns were examined experimentally and analytically in this research. Twenty-four column specimens were built for this study to examine the impact of steel fiber, recycled aggregate, slenderness, and eccentricity on the behavior of reinforced concrete columns. This research examined the failure mode, maximum load-carrying capacity, strain in the concrete, strain in the reinforcement, and ductility. Based on the results, it can be concluded that employing recycled concrete aggregate is a potential approach to meet design codes. The addition of 1% steel fiber effectively prevents concrete from crushing and spalling. Steel fiber, however, improved the columns’ ductility and strength. The results showed the maximum load-carrying capacity of the specimens and the results of using ACI-318 code equations agreed very well. Furthermore, a model is proposed for columns with both natural and recycled aggregate and which accounts for the eccentricity and slenderness to forecast the load-carrying capacity. The outcomes demonstrated that the design principles were met well. Plots of load–moment interaction diagrams for short and slender columns made with the ACI-318 method are compared to the findings of the experiments.

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Section: Introductionmentioning

confidence: 60%

Experimental and Analytical Study on Recycled Aggregate RC Columns: Short and Slender Loaded Axially and Eccentrically

Najar,

Rasheed,

Taha

2024

Sustainability

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Eurocode 2 design of recycled aggregate concrete elements under compression: Evaluation through model uncertainties from tests on columns

Knapcová,

Pacheco,

de Brito

et al. 2024

Structural Concrete

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Recycled aggregate concrete contributes to the recovery of construction and demolition waste, which is a growing societal concern. The technical feasibility of recycled aggregate concrete has been extensively tested and validated and the revisions of codes are already including clauses for recycled aggregate concrete specification and design. However, there are still doubts regarding its structural behavior. This article assesses the suitability of Eurocode 2 design clauses for concrete elements under compression when used for recycled aggregate concrete design. This is done through the analysis of model uncertainties that are estimated from a database collected from laboratory experiments on columns. Both the current version of Eurocode 2 (with and without taking confinement into account) and the upcoming (second generation) Eurocode 2 are considered. A database was collected with clearly defined criteria and includes coarse recycled aggregates produced from concrete waste, since columns made with other types of recycled aggregates are scarcely tested and do not represent the current status for structural recycled aggregate concrete design and production. The statistics of the model uncertainty for natural and recycled concrete columns were compared and it was observed that the mean model uncertainty tends to decrease slightly when recycled aggregates are used. However, a preliminary assessment of whether a partial factor for recycled aggregate concrete compression design should be used concluded that this partial factor is not necessary to ensure reliable design and the design of columns may be carried out using the same formulae used for conventional concrete. The format proposed may be used for other resistance models, provided that the partial factor is calibrated for each resistance model.

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