Analytical and Experimental Investigation of Recycled Aggregate Concrete Beams Subjected to Pure Torsion

Masne, N.; Suryawanshi, S. R.

doi:10.5829/ije.2022.35.10a.14

Cited by 9 publications

(8 citation statements)

References 11 publications

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“…Due to this rapid development, there have been a massive increase in C&D waste generation. In order to promote sustainability and alleviate the stress on the environment from the excessive use of natural aggregates, recycled aggregates are increasingly used in concrete manufacturing [5].…”

Section: Introductionmentioning

confidence: 99%

Comprehensive Analysis of Stress-strain Relationships for Recycled Aggregate Concrete

Suryawanshi

2022

IJE

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There is a growing demand of suitable substitute materials of concrete ingredients especially fine and coarse aggregates in order to achieve sustainable development in the era of rapid urbanisation. Therefore, the concrete making process by utilisation of aggregates that recycled from construction and demolition (C&D) debris has emerged as a primary objective for many government agencies. Consequently, the utilisation of recycled aggregate concrete (RAC) in structural applications become essential aspect. However, RAC can be employed in structural applications only if effective stress-strain relationship is available. The stress-strain models developed for natural aggregate concrete (NAC) are not fully suitable for RAC. Hence, the selection of good model which has precise prediction capacity plays a crucial role. Moreover, the stress-strain models provide the basis for the analysis and modern design procedures especially in FEA packages. In the present study, the stress-strain models for RAC have been selected from the literature and critically reviewed in order to evaluate their predictive efficacy. The test samples in the form of measured stress-strain relations-hips derived from literature have been compared with the predictions of each selected model. Besides the comparison of measured and predicted stress-strain profiles, the output of selected models in terms of normalized toughness and ductility index was assessed. The consistency of output of models are further evaluated by employing statistical tools such as coefficient of variance and root mean square error. The outcomes of the model in the form of polynomial expression was relatively more accurate to that of other counterparts.

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Section: Introductionmentioning

confidence: 99%

Comprehensive Analysis of Stress-strain Relationships for Recycled Aggregate Concrete

Suryawanshi

2022

IJE

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“…To evaluate the torsional capacity of both natural aggregate concrete (NAC) and recycled aggregate concrete (RAC) beams under pure torsion, an experimental investigation was conducted. The obtained results were subsequently validated by simulating them in the ATENA-3D simulation software (25). These types of studies demonstrate the increasing potential of recycled aggregate concrete for its structural applications (23,25).…”

Section: Introductionmentioning

confidence: 80%

Machine Learning Models for Mechanical and Micro Structural Properties of Recycled Fine Aggregate Concrete Using Different Mixing Approaches

Ranjith,

Yashwanth,

Kiran

et al. 2024

IJE

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The construction industry is primarily responsible for the depletion of natural resources and the disruption of environmental equilibrium due to unregulated mining activities. In this particular context, the utilization of recycled fine aggregate (RFA) derived from construction and demolition (C&D) waste presents itself as a viable solution. The conventional method of mix proportioning for RFA in concrete is not applicable in this case. The main innovation of our research lies in the fulfilment of one of the principles of circular economy, namely the reduction of carbon emissions, through the recycling of locally collected concrete waste. To tackle this issue, a novel triple mix-proportioning approach has been developed using the concepts of maximum packing density and minimum paste theory. The fresh and hardened properties were evaluated and microstructural characterization was carried out for the newly formulated mixes incorporating RFA with optimized combined aggregates. The compressive strength of concrete with recycled fine aggregate increases by 5.04% for 25% and, 21.69% for 50% replacement, and decreases by 35.44% for 100% replacement as compared to controlled concrete at the age of 28 days using the triple mixing approach. The findings indicate that replacing approximately 50% of sand with RFA is the optimal amount, as further replacement leads to a decrease in compressive strength, particularly at 100% replacement due to the presence of adhered mortar in RFA. In this study, the performance evaluation of RFA concrete has been conducted by comparing six established ML regression models and sensitivity analysis was performed to assess the variable's performance.

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“…To construct the numerical model for the CFRP-reinforced concrete beams, the program ATENA 3D (Cervenka, Praha, Czech Republic) [ 53 ] was utilized. ATENA 3D is nonlinear finite element analysis software that is widely used in the numerical study of concrete structures [ 54 , 55 , 56 , 57 , 58 ]. In this study, the CFRP-strengthened RC beams were modeled using the brick element (concrete) and shell element (CFRP strips).…”

Section: Finite Element Analysismentioning

confidence: 99%

Performance of Reinforced Concrete Beams Strengthened by Bidirectional Carbon-Fiber-Reinforced Polymers Based on Numerical Models

Moon¹,

Kim

et al. 2023

Polymers

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The use of carbon-fiber-reinforced polymers (CFRPs) for the repair and rehabilitation of reinforced concrete (RC) structures has been receiving a lot of attention. Specifically, the shear strengthening of RC members based on CFRP materials has been treated as an effective and efficient strengthening method. Previous research projects focused on the shear strengthening of RC members with unidirectional CFRP strips. Although the effectiveness of a bidirectional CFRP layout compared to a unidirectional CFRP layout was discussed in several studies, these studies only investigated the issue based on experiments. Morever, the parameters of the bidirectional CFRP layout were not clearly defined. This study investigates the performance of RC beams strengthened by bidirectional CFRP based on numerical models. A numerical model based on finite element analysis is designed. Using the numerical model, the parameters of the horizontal CFRP strips, such as the layouts of horizontal CFRP strips and the number of horizontal CFRP strips, are studied. The results show that the effect of horizontal CFRP strips is maximized if the strips are distributed along the depth. In contrast, the number of horizontal CFRP strips does not significantly affect the shear strength of RC members.

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Analytical and Experimental Investigation of Recycled Aggregate Concrete Beams Subjected to Pure Torsion

Cited by 9 publications

References 11 publications

Comprehensive Analysis of Stress-strain Relationships for Recycled Aggregate Concrete

Comprehensive Analysis of Stress-strain Relationships for Recycled Aggregate Concrete

Machine Learning Models for Mechanical and Micro Structural Properties of Recycled Fine Aggregate Concrete Using Different Mixing Approaches

Performance of Reinforced Concrete Beams Strengthened by Bidirectional Carbon-Fiber-Reinforced Polymers Based on Numerical Models

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