Properties investigation of recycled aggregates and concrete modified by accelerated carbonation through increased temperature

Lu, Zheng; Tan, Qihang; Lin, Jenshan; Wang, Dianchao

doi:10.1016/j.conbuildmat.2022.127813

Cited by 37 publications

(14 citation statements)

References 60 publications

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“…The required RH is in accordance with the flow-through carbonation method, while saturated Mg(NO3)2 solution or silica gels can be applied to maintain the optimal RH during carbonation [26,[32][33][34]. In addition, the increase of carbonation temperature from 25 ± 5 °C to 70 ± 5 °C considerably enhanced the CO2 uptake of recycled aggregates by 38.6% within 24 h, in comparison with that of standard CO2 curing [35,36].…”

Section: Gas-solid Carbonation Methodsmentioning

confidence: 96%

Roles of carbonated recycled fines and aggregates in hydration, microstructure and mechanical properties of concrete: A critical review

Zhang

Chen

Wang

et al. 2023

Cement and Concrete Composites

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Section: Gas-solid Carbonation Methodsmentioning

confidence: 96%

Roles of carbonated recycled fines and aggregates in hydration, microstructure and mechanical properties of concrete: A critical review

Zhang

Chen

Wang

et al. 2023

Cement and Concrete Composites

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“…Pretreatment primarily serves to remove or improve the old mortar attached to the RA. Wang et al [59] and Lu et al [60] used carbonization technology to improve the old mortar and soaked the RA in acetic acid to remove the old mortar. Tam et al [61] used different presoaking treatment methods to remove the old mortar, and observed that the water absorption of the treated RA was lower than that of the untreated RA.…”

Section: Influence Of Ra On the Workability Of Concretementioning

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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“…The optimum relative humidity for carbonation should be between 40% and 80%. It is demonstrated that at 28 days, the modified RA with 100% substitution has a 14.2% improvement in compressive strength [ 38 ]. Ouyang et al [ 39 ] specifically investigated the effect of calcium supply in microbially induced carbonate precipitation on RA.…”

Section: Introductionmentioning

confidence: 99%

Mechanical Properties and Durability of Geopolymer Recycled Aggregate Concrete: A Review

et al. 2023

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Geopolymer recycled aggregate concrete (GPRAC) is a new type of green material with broad application prospects by replacing ordinary Portland cement with geopolymer and natural aggregates with recycled aggregates. This paper summarizes the research about the mechanical properties, durability, and microscopic aspects of GPRAC. The reviewed contents include compressive strength, elastic modulus, flexural strength, splitting tensile strength, freeze–thaw resistance, abrasion resistance, sulfate corrosion resistance, and chloride penetration resistance. It is found that GPRAC can be made to work better by changing the curing temperature, using different precursor materials, adding fibers and nanoparticles, and setting optimal mix ratios. Among them, using multiple precursor materials in synergy tended to show better performance compared to a single precursor material. In addition, using modified recycled aggregates, the porosity and water absorption decreased by 18.97% and 25.33%, respectively, and the apparent density was similar to that of natural aggregates. The current results show that the performance of GPRAC can meet engineering requirements. In addition, compared with traditional concrete, the use of GPRAC can effectively reduce carbon emissions, energy loss, and environmental pollution, which is in line with the concept of green and low-carbon development in modern society. In general, GPRAC has good prospects and development space. This paper reviews the effects of factors such as recycled aggregate admixture and curing temperature on the performance of GPRAC, which helps to optimize the ratio design and curing conditions, as well as provide guidance for the application of recycled aggregate in geopolymer concrete, and also supply theoretical support for the subsequent application of GPRAC in practical engineering.

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Properties investigation of recycled aggregates and concrete modified by accelerated carbonation through increased temperature

Cited by 37 publications

References 60 publications

Roles of carbonated recycled fines and aggregates in hydration, microstructure and mechanical properties of concrete: A critical review

Roles of carbonated recycled fines and aggregates in hydration, microstructure and mechanical properties of concrete: A critical review

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

Mechanical Properties and Durability of Geopolymer Recycled Aggregate Concrete: A Review

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