Mechanical characterization of recycled concrete under various aggregate replacement scenarios

K.C, Sajan; Adhikari, Rishav; Mandal, Bharat; Gautam, Dipendra

doi:10.1016/j.clet.2022.100428

Cited by 13 publications

(3 citation statements)

References 36 publications

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“…Additionally, the interfacial transition zones (ITZs) between the new cement mortar and aggregate in RAC are typically inferior to those in NAC, owing to the presence of adhered old mortar. Consequently, the resulting hardened RAC exhibits compromised durability, diminished strength, and reduced elastic modulus [17][18][19][20]. Compared to recycled coarse aggregate (RCA), reports in the literature suggest that recycled fine aggregate (RFA) tends to contain a higher proportion of old mortar and exhibits greater water absorption [21].…”

Section: Introductionmentioning

confidence: 99%

Enhancing the Mechanical and Durability Properties of Fully Recycled Aggregate Concrete Using Carbonated Recycled Fine Aggregates

Jean,

Liu,

Zhu

et al. 2024

Materials

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The global construction industry is increasingly utilizing concrete prepared from recycled aggregate as a substitute for natural aggregate. However, the subpar performance of recycled fine aggregate (RFA) has resulted in its underutilization, particularly in the structural concrete exposed to challenging environments, including those involving chlorine salts and freeze–thaw climates. This study aimed to enhance the performance of RFA as a substitute for river sand in concrete as well as fulfill the present demand for fine aggregates in the construction sector by utilizing accelerated carbonation treatment to create fully recycled aggregate concrete (FRAC) composed of 100% recycled coarse and fine aggregates. The impacts of incorporating carbonated recycled fine aggregate (C-RFA) at various replacement rates (0%, 25%, 50%, 75%, and 100%) on the mechanical and durability properties of FRAC were investigated. The results showed that the physical properties of C-RFA, including apparent density, water absorption, and crushing value, were enhanced compared to that of RFA. The compressive strength of C-RFC100 was 19.8% higher than that of C-RFC0, while the water absorption decreased by 14.6%. In a comparison of C-RFC0 and C-RFC100, the chloride permeability coefficients showed a 50% decrease, and the frost resistance increased by 27.6%. According to the findings, the mechanical and durability properties, the interfacial transition zones (ITZs), and micro-cracks of the C-RFC were considerably enhanced with an increased C-RFA content.

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Section: Introductionmentioning

confidence: 99%

Enhancing the Mechanical and Durability Properties of Fully Recycled Aggregate Concrete Using Carbonated Recycled Fine Aggregates

Jean,

Liu,

Zhu

et al. 2024

Materials

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“…RAC can realize the recycling of waste concrete, reduce the mining of natural resources and construction waste landfill, and has broad engineering application prospects 2,3 . Compared with natural coarse aggregate (NCA), recycled coarse aggregate (RCA) has more edges and corners, and a great deal of old mortar attached on its surface 4,5 . In addition, there is a great deal of micro‐cracks formed in RCA because of the damage accumulation in the early crushing process of waste concrete.…”

Section: Introductionmentioning

confidence: 99%

“…attached on its surface. 4,5 In addition, there is a great deal of micro-cracks formed in RCA because of the damage accumulation in the early crushing process of waste concrete. As a result, RCA has the characteristics of large porosity, high water absorption, low bulk density, high crushing index, and high micro-powder content.…”

mentioning

confidence: 99%

Flexural stiffness of recycled aggregate concrete beams under combined effect of load and steel corrosion

Wang

Qin

2023

Structural Concrete

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Since reinforced concrete members suffer from different types of loads during their service life, the steel bars embedded in reinforced concrete members can be easily corroded in chloride‐laden environment. To investigate the influence of combined effect of load and steel corrosion on the flexural stiffness of recycled aggregate concrete (RAC) beams, 12 RAC beams were prepared and tested. The effects of load level (i.e., the ratio of the load applied to beams to the ultimate load) and recycled coarse aggregate (RCA) replacement ratio (i.e., the ratio of RCAs to replace natural coarse aggregates) on the internal force arm coefficient of cracking cross‐section, the elastoplastic resistance moment coefficient of cross‐section, and the strain incongruity coefficient of corroded tensile steel bars were analyzed, and a calculation model for flexural stiffness of RAC beams under combined effect of load and steel corrosion was established. The results showed that when the ratio of bending moment to ultimate bending moment of the pure bending part of beams was within 0.55–0.80 and the average mass loss of tensile steel bars was less than 3.23%, 0.85 could be adopted as the internal force arm coefficient of cracking cross‐section. The elastoplastic resistance moment coefficient of cross‐section was approximately a constant when the corroded RAC beams were in the service stage, while it increased obviously with the load level. There was a strong linear relationship between strain incongruity coefficient and average mass loss of tensile steel bars during the service stage of corroded RAC beams, and the strain incongruity coefficient increased linearly with the load level. The calculated values of the model of flexural stiffness proposed in this paper were in reasonable agreement with the experimental values.

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The Effect of Silica Fume and Slag Cement on the Dynamic Modulus of Recycled Aggregate Concrete

Wijatmiko,

Nainggolan,

Suzuki

et al. 2024

Springer Series in Geomechanics and Geoengineering

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Mechanical characterization of recycled concrete under various aggregate replacement scenarios

Cited by 13 publications

References 36 publications

Enhancing the Mechanical and Durability Properties of Fully Recycled Aggregate Concrete Using Carbonated Recycled Fine Aggregates

Enhancing the Mechanical and Durability Properties of Fully Recycled Aggregate Concrete Using Carbonated Recycled Fine Aggregates

Flexural stiffness of recycled aggregate concrete beams under combined effect of load and steel corrosion

The Effect of Silica Fume and Slag Cement on the Dynamic Modulus of Recycled Aggregate Concrete

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