Durability of concrete bearing polymer-treated mixed recycled aggregate

Velardo, Paula; Bosque, I.F. Sáez del; Rojas, M.I. Sánchez de; Belie, Nele De; Medina, César

doi:10.1016/j.conbuildmat.2021.125781

Cited by 21 publications

(15 citation statements)

References 104 publications

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“…(2020) also reported that RCA modification with 1.5% polyvinyl alcohol positively impacted concrete durability while subjected to salt-solution freezing and thawing cycles. In another research, the RCA is soaked for 60 min in 20% acrylic resin polymer emulsion and dried in an oven or air, resulting in no crucial impact on the compressive strength but 64% less water permeability (Velardo et al ., 2022). Heating the treated RCA, which was also mentioned by (Spaeth and Djerbi Tegguer, 2013), makes this method not energy efficient.…”

Section: Rca Treatmentmentioning

confidence: 99%

A review of the advanced treatment techniques for enriching the recycled concrete aggregates for recycled-based concrete: economic, environmental and technical analysis

Nikmehr

Kafle

Al-Ameri

2023

SASBE

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PurposeThis study aimed to review various existing methods for improving the quality of recycled concrete aggregates (RCAs) as a possible substitution for natural aggregates (NAs) in concrete. It is vital as the old paste attached to the RCA weakens its structure. It is due to the porous structure of the RCA with cracks, weakening the interfacial transition zone (ITZ) between the RCA and binding material, negatively impacting the concrete's properties. To this end, various methods for reinforcement of the RCA, cleaning the RCA's old paste and enhancing the quality of the RCA-based concrete without RCA modification are studied in terms of environmental effects, cost and technical matters. Furthermore, this research sought to identify gaps in knowledge and future research directions.Design/methodology/approachThe review of the relevant journal papers revealed that various methods exist for improving the properties of RCAs and RCA-based concrete. A decision matrix was developed and implemented for ranking these techniques based on environmental, economic and technical criteria.FindingsThe identified methods for reinforcement of the RCA include accelerated carbonation, bio deposition, soaking in polymer emulsions, soaking in waterproofing admixture, soaking in sodium silicate, soaking in nanoparticles and coating with geopolymer slurry. Moreover, cleaning the RCA's old paste is possible using acid, water, heating, thermal and mechanical treatment, thermo-mechanical and electro-dynamic treatment. Added to these treatment techniques, using RCA in saturated surface dry (SSD) mixing approaches and adding fibres or pozzolana enhance the quality of the RCA-based concrete without RCA modification. The study ranked these techniques based on environmental, economic and technical criteria. Ultimately, adding fibres, pozzolana and coating RCA with geopolymer slurry were introduced as the best techniques based on the nominated criteria.Practical implicationsThe study supported the need for better knowledge regarding the existing treatment techniques for RCA improvement. The outcomes of this research offer an understanding of each RCA enrichment technique's importance in environmental, economic and technical criteria.Originality/valueThe practicality of the RCA treatment techniques is based on economic, environmental and technical specifications for rating the existing treatment techniques.

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Section: Rca Treatmentmentioning

confidence: 99%

A review of the advanced treatment techniques for enriching the recycled concrete aggregates for recycled-based concrete: economic, environmental and technical analysis

Nikmehr

Kafle

Al-Ameri

2023

SASBE

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“…It has been reported that concrete with uniform size distribution of lightweight aggregates has the best workability and mechanical properties. The addition of water-reducing admixtures [5] and the use of specially treated recycled masonry aggregates [6] have been found to effectively enhance the frost resistance of concrete. Dai et al [7] established the relationship between natural and laboratory accelerated concrete in terms of the service life and strength, and it was observed that that the concrete cured at −3 °C reached the same strength as that of the standard-cured concrete at 28 days of curing, but it could not achieve the same frost resistance, durability, and service life.…”

Section: Introductionmentioning

confidence: 99%

Study on the Mechanical Properties and Dynamic Constitutive Relationship of Ceramsite Concrete Affected by Freeze-Thaw Cycling

Li,

Huang

et al. 2023

Preprint

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In this study, the dynamic and static mechanical properties as well as the internal microstructure (capillary porosity) and constitutive relationship of sulphoaluminate ceramsite concrete with a ceramsite volume fraction of 40% are examined under freeze-thaw cycling. The results reveal that an increase in the number of freeze-thaw cycles or a decrease in the lowest temperature of the freeze-thaw cycle leads to a decline in the compressive strength and performance, causing enlargement of pores in the ceramsite concrete. During the freeze-thaw cycles, the internal pores in the ceramsite concrete expand outward due to water freezing and expansion. In dynamic compression tests, the transition zone between ceramsite and matrix within the ceramsite concrete is the most susceptible to cracking and damage, forming a distinct primary crack. Industrial computed tomography (CT) scanning results demonstrate that both impact compression and freeze-thaw cycling exacerbate the internal damage in concrete. The expansion of internal pores in the concrete during freeze-thaw cycles is closely related to the lowest temperature T*, the number of freeze-thaw cycles N, and the expansion factor k of freeze-thaw pores. In conjunction with experimental analysis, a constitutive relationship is proposed that accounts for the effects of freeze-thaw cycling on the damage behavior of ceramsite concrete.

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“…The use of structural RAC in chloride-containing environments has sparked debate among researchers [12]. Some authors indicate that the increase in RCA content could lead to a higher diffusion of chlorides in RAC due to its high porosity [13,14].…”

Section: Introductionmentioning

confidence: 99%

Durable Structural Concrete Produced with Coarse and Fine Recycled Aggregates Using Different Cement Types

Vintimilla,

Etxeberria,

2023

Sustainability

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The durability properties of structural recycled aggregate concrete (RAC) produced with 50% coarse recycled concrete aggregates and up to 20% fine recycled concrete aggregates were analysed and compared to those of conventional concrete (NAC). Both the RAC and NAC mixtures achieved the same compressive strength when using an effective water–cement ratio of 0.47 and 0.51, respectively. All the concretes were produced using three types of cement: CEM II A/L 42.5 R, CEM II A/S 42.5 N/SRC and CEM III/B 42.5 N-LH/SR. The properties of drying shrinkage, chloride permeability, and accelerated carbonation coefficient of the concretes were determined experimentally, and the obtained results were compared with the values estimated by specific standards of exposure to XC1–XC4 (corrosion induced by carbonation can happen due to the presence of humidity) and XS1 (corrosion caused by chlorides from seawater) environments. The results showed that all the concretes achieved maximum drying shrinkage for use in structural concrete. Any concretes produced with CEM IIIB, including the RAC-C50-F20 concrete, achieved very low chloride ion penetrability, ranging between 500 to 740 Coulombs. In addition, all concretes manufactured with CEM IIAL and CEM IIAS, including RAC-C50-F20, were suitable for use in XC3 and XC4 exposure environments, both with 50- and 100-year lifespans.

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Durability of concrete bearing polymer-treated mixed recycled aggregate

Cited by 21 publications

References 104 publications

A review of the advanced treatment techniques for enriching the recycled concrete aggregates for recycled-based concrete: economic, environmental and technical analysis

A review of the advanced treatment techniques for enriching the recycled concrete aggregates for recycled-based concrete: economic, environmental and technical analysis

Study on the Mechanical Properties and Dynamic Constitutive Relationship of Ceramsite Concrete Affected by Freeze-Thaw Cycling

Durable Structural Concrete Produced with Coarse and Fine Recycled Aggregates Using Different Cement Types

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