Mechanical properties and microstructure of nano-strengthened recycled aggregate concrete

Zheng, Ying‐Ying; Zhang, Yahui; Zhuo, Jingbo; Zhang, Peng; Kong, Weixing

doi:10.1515/ntrev-2022-0077

Cited by 24 publications

(5 citation statements)

References 50 publications

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“…The quality of RA depends on the treatment method and degree of the aggregates. Common treatment methods include mechanical [18], chemical [19,20], and biological [21,22] treatments. The purpose of these treatments is to remove or enhance the old mortar attached to the surface of the RA, thereby enhancing its quality.…”

Section: Introductionmentioning

confidence: 99%

Effect of Recycled Aggregate and Slag as Substitutes for Natural Aggregate and Cement on the Properties of Concrete: A Review

Zhang¹,

Wang²,

Zheng³

et al. 2023

Journal of Renewable Materials

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Using recycled aggregate (RA) and slag instead of natural aggregate (NA) and cement can reduce greenhouse gas emissions (GHGE) and achieve effective waste recovery. In recent years, RA has been widely used to replace NA in concrete. Every year, several researchers conduct investigations on the mechanical performance and durability of recycled aggregate concrete (RAC). Due to the loose and porous material properties of RA, the mechanical properties and durability of RAC, such as strength, carbonation resistance, permeability resistance and chloride ion penetration resistance, are greatly reduced compared with natural aggregate concrete. In contrast, concrete containing slag instead of NA and cement generally improved the strength of concrete and reduced the internal porosity of materials. Herein, we discuss the effects of RA and slag on the workability, compressive strength, splitting tensile strength, ultrasonic pulse velocity (UPV) value, and elastic modulus of concrete. The relationships between the compressive strength and the splitting tensile strength, UPV value, and elastic modulus are discussed, and the optimal substitution method is proposed. In addition, various equations for calculating the compressive strength of concrete based on performance factors related to the compressive strength are summarized.

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Section: Introductionmentioning

confidence: 99%

Effect of Recycled Aggregate and Slag as Substitutes for Natural Aggregate and Cement on the Properties of Concrete: A Review

Zhang¹,

Wang²,

Zheng³

et al. 2023

Journal of Renewable Materials

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“…Construction wastes from many disasters and demolition wastes can be treated by a series of steps that include sieving, grinding, autogenous cleaning, and particle homogenization to be made into recycled aggregate that can be used as a replacement (partial or complete replacement) for natural aggregate in concrete, resulting in recycled aggregate concrete (RAC). [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.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, alternative sources of aggregate could offer an attractive solution for this high‐demand problem and open new prospects for sustainability. Construction wastes from many disasters and demolition wastes can be treated by a series of steps that include sieving, grinding, autogenous cleaning, and particle homogenization to be made into recycled aggregate that can be used as a replacement (partial or complete replacement) for natural aggregate in concrete, resulting in recycled aggregate concrete (RAC) 1–7 …”

Section: Introductionmentioning

confidence: 99%

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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“…These types of concrete have following benefits 11-13 : (i) Enhanced strength: Sulfur concrete exhibits superior strength compared to traditional cement concrete, thanks to its low porosity and high-density mixture. This results in a more durable and longlasting building material [14][15][16] .…”

Section: Introductionmentioning

confidence: 99%

Application of Sulfur-2,4-dinitrophenylhydrazine as Modifier for Producing an Advantageous Concrete

Turaev,

Shavkatova,

Amanova

et al. 2023

Baghdad Sci.J

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In this investigative endeavor, a novel concrete variety incorporating sulfur-2,4-dinitrophenylhydrazine modification was developed, and its diverse attributes were explored. This innovative concrete was produced using sulfur-2,4-dinitrophenylhydrazine modification and an array of components. The newly created sulfur-2,4-dinitrophenylhydrazine modifier was synthesized. The surface texture resulting from this modifier was examined using SEM and EDS techniques. The component ratios within concrete, chemical and physical traits derived from the sulfur-2,4-dinitrophenylhydrazine modifier, chemical and corrosion resistance of concrete, concrete stability against water absorption, concrete resilience against freezing, physical and mechanical properties, durability, elastic modulus, and thermal expansion coefficient of the examined sulfur-infused concrete were assessed. The acquired results also substantiated that the thermal expansion coefficient value for sulfur-2,4-dinitrophenylhydrazine modified concrete was 14.8×10-6/0C. The average deformation of the analyzed concrete was 0.0026-0.0051, indicating a superior deformation performance compared to conventional concretes. Concrete with smaller aggregate sizes exhibited greater density, specifically 2283 kg/m3. The concrete density decreased gradually with an increase in aggregate size. The stability of sulfur-2,4-dinitrophenylhydrazine modified concrete was remarkably high in various aggressive environments. EDS analysis revealed that carbon atoms constituted 56.63% of the total mass, while sulfur made up 33.91% of the total mass. The obtained SEM outcomes demonstrated that the sulfur-2,4-dinitrophenylhydrazine modifier exhibited a more porous structure, devoid of crystalline formations. The sulfur-2,4-dinitrophenylhydrazine modification experienced a single-stage thermal mass loss, with the mass loss events being endothermic in nature. The IR findings verified the presence of amino functional groups (connected melamine ring) and the establishment of polymer sulfur chains.

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Mechanical properties and microstructure of nano-strengthened recycled aggregate concrete

Cited by 24 publications

References 50 publications

Effect of Recycled Aggregate and Slag as Substitutes for Natural Aggregate and Cement on the Properties of Concrete: A Review

Effect of Recycled Aggregate and Slag as Substitutes for Natural Aggregate and Cement on the Properties of Concrete: A Review

Automated analysis and design for recycled aggregate reinforced concrete beams

Application of Sulfur-2,4-dinitrophenylhydrazine as Modifier for Producing an Advantageous Concrete

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