Mechanical properties of multi-recycled aggregate concrete under combined compression-shear loading

Lei, Bin; Yu, Hongchen; Guo, Yipu; Zhao, Hanbing; Wang, Kejin; Li, Wengui

doi:10.1016/j.engfailanal.2022.106910

Cited by 16 publications

(5 citation statements)

References 47 publications

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“…The aforementioned studies have investigated the effect of multiple recycling of concrete and reported the progressive decrease in performance as the number of times of recycling increases [ 11 , 12 , 13 ]. As a rule, the quality degradation of recycled aggregate occurring in the repeated recycling is identified as the cause of the gradual decrease in MRAC performance [ 14 ].…”

Section: Introductionmentioning

confidence: 99%

Influence of Mix Design on Physical, Mechanical and Durability Properties of Multi-Recycled Aggregate Concrete

et al. 2023

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The decrease in the quality of recycled aggregate due to an increase in the number of recycling is a primary factor that limits the multi-recycling of concrete. This degradation adversely affects concrete performance; thus, the characteristics of recycled aggregate should be considered during the mix design stage, but little research has taken that into account. This study investigates the effect of the equivalent mortar volume (EMV) mix design on some physical, mechanical and durability properties of concrete made of multiple recycled coarse aggregates at 50% and 100% replacement ratios compared to concrete made by the conventional mix design (CMD). The results showed that the performances of concrete by the CMD decreased with an increasing number of recycling cycles. The properties of EMV-based concrete deteriorated with an increase in the number of recycling cycles at 100% replacement ratio due to poor workability caused by a shortage of fresh mortar. However, at 50% replacement, the EMV-based concrete exhibited similar performance across the three cycles of recycling, as well as improved properties over natural aggregate concrete. This study demonstrated that an appropriate mix design and optimal aggregate replacement ratio can offset the property loss of multiple recycled aggregate concrete.

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Section: Introductionmentioning

confidence: 99%

Influence of Mix Design on Physical, Mechanical and Durability Properties of Multi-Recycled Aggregate Concrete

et al. 2023

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“…[1][2][3][4][5][6][7] Despite the benefits of RAC, the structural application of RAC is still limited. 1,[8][9][10][11][12][13] This is caused by the simple hesitation of changing the common practice of using natural aggregate concrete due to the inferior structural performance of RAC members compared to the natural aggregate concrete members. 8,[14][15][16] When it comes to the design of reinforced concrete beams, the shear performance is a great concern.…”

Section: Introductionmentioning

confidence: 99%

“…1,[8][9][10][11][12][13] This is caused by the simple hesitation of changing the common practice of using natural aggregate concrete due to the inferior structural performance of RAC members compared to the natural aggregate concrete members. 8,[14][15][16] When it comes to the design of reinforced concrete beams, the shear performance is a great concern. Therefore, many researchers investigated the applicability of the design codes for the design of RAC members.…”

Section: Introductionmentioning

confidence: 99%

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Automated analysis and design for recycled aggregate reinforced concrete beams

Saleh,

Murad,

Tarawneh

et al. 2023

Structural Concrete

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The goal of this study is to propose a robust method for the analysis and design of recycled aggregate reinforced concrete (RAC) beams. For this purpose, a machine‐learning framework, named, GA‐XGBoost was designed. A comprehensive dataset of 276 tests of RAC beams was compiled from available literature for training, validating, and testing the models. The results confirmed that the proposed models can offer a precise tool for failure mode classification and capacity prediction of RAC beams. For the design framework, a Generative Adversarial Network for tabular data was utilized to produce synthetic data. These synthetic data can provide options for the selection of design variables. In this framework, the design variables are selected by specifying the design constraints, the objective function to be optimized, and validating the capacity requirements using the developed GA‐XGBoost models. Lastly, a web application was developed to make the proposed GA‐XGBoost models appropriate for practical design.

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“…Amario [ 4 ] studied the mechanical properties of recycled aggregates concrete (RAC) and the results showed that the RCAs have a significant adverse effect on the compressive strength of concrete. Lei’s experimental results show that the compressive strength, flexural strength, and sulfate resistance of recycled concrete are inferior to those of ordinary concrete [ 5 , 6 , 7 , 8 ]. The high porosity of RCAs makes them in fresh concrete will absorb the water from the mortar, changing the actual water volume of fresh concrete mixture, so that the slump of fresh concrete is much smaller than that of conventional concrete, and the workability is difficult to reach the design requirement [ 9 ].…”

Section: Introductionmentioning

confidence: 99%

Investigation of Water Absorption Behavior of Recycled Aggregates and its Effect on Concrete Strength

2023

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The water–cement ratio (w/c) has a significant effect on the strength of recycled concrete. In this study, considering the effects of water/cement ratio, strength, and water content of recycled aggregates, two kinds of pulse sequences of low-field nuclear magnetic resonance (LF-NMR) were applied to investigate the water migration behavior between simulated recycled aggregates (SRA) and water or fresh mortar. Three sets of concrete strength tests were designed and the results were used to verify the findings of LF-NMR imaging tests. The results showed that the depth of water migration in the SRA increases with time: at first the change rate is rapid, then slows down, and eventually tends to remain stable. When the SRA is in contact with fresh mortar with low w/c, no water migration occurs because the hydration of the cement in the mixture consumes a large amount of water, resulting in the inability of water to migrate into the SRA through capillary pressure. For the recycled aggregate concrete with high strength, the addition of extra water will increase the effective w/c and reduce the compressive strength of the concrete.

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Mechanical properties of multi-recycled aggregate concrete under combined compression-shear loading

Cited by 16 publications

References 47 publications

Influence of Mix Design on Physical, Mechanical and Durability Properties of Multi-Recycled Aggregate Concrete

Influence of Mix Design on Physical, Mechanical and Durability Properties of Multi-Recycled Aggregate Concrete

Automated analysis and design for recycled aggregate reinforced concrete beams

Investigation of Water Absorption Behavior of Recycled Aggregates and its Effect on Concrete Strength

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