Experimental Study on the Chloride Diffusivity of Recycled Aggregate Concrete

Qin, Hong; Zhao, Yan Lin; Luo, Bo Guang; Chen, Yi Hu

doi:10.4028/www.scientific.net/amr.168-170.1404

Cited by 3 publications

(7 citation statements)

References 3 publications

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“…In addition, refs. [ 59 , 115 , 116 , 117 , 118 , 119 , 120 , 121 , 122 ] also reported the excellent performance of FA in terms of resistance to chloride ion penetration. Kou and Poon [ 94 ] found the percentage reduction in chloride ingress at 10 years of age firstly increased and then decreased with the FA content.…”

Section: Chloride Penetrationmentioning

confidence: 99%

“…Kim et al [ 95 ] concluded that the positive role of FA was not obvious at early ages, which may be due to the hydration retardation of FA. Apart from FA, slag also exhibits an efficiency effect on RAC’s chloride penetration resistance enhancement [ 116 , 118 , 121 , 124 ]. Kou et al [ 116 ] compared the chloride penetration of RAC with the incorporation of different mineral admixtures.…”

Section: Chloride Penetrationmentioning

confidence: 99%

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A Review of Chloride Penetration of Recycled Concrete with Enhancement Treatment and Service Life Prediction

Wang,

Liao,

Zhang

2024

Materials

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The application of recycled coarse aggregate (RA) in structural concrete can save non-renewable resources and reduce land occupation. Developing comprehensive knowledge of chloride penetration and service life modeling of recycled coarse aggregate concrete (RAC) is a prerequisite for practice. However, compared with the natural aggregate concrete (NAC), the inferior durability performance, especially chloride penetration resistance, of RAC hinders its application in structural concrete. Therefore, many RAC performance enhancement methods have been proposed. This paper presents a holistic review focused on the chloride penetration of RAC with/without enhancement methods and service life prediction. The current RAC performance enhancement methods are introduced. The improvement effect of the corresponding enhancement methods on the chloride penetration resistance of RAC are discussed and analyzed in turn. Based on the reviewed data on the chloride diffusion coefficient, the modification efficiencies of assorted enhancement methods are summarized. With the hope of promoting RAC application in structural concrete, the current literature on chloride-ingress-based service life prediction for RAC is also overviewed. In addition, the typical influencing factors on chloride transport properties are also discussed, i.e., RA quality. It can be concluded that enhancement techniques can effectively improve the chloride penetration resistance of RAC. The old mortar enhancement or removal methods can improve the chloride penetration resistance by 15–30%, depending on the specific treatment measures. The modification efficiency of the modifier material depends on the specific type and content of the incorporated substance, which ranges from approximately 5% to 95%. The estimated service life of RAC structures decreases with the increasing RA replacement ratio. Finally, concluding remarks are provided concerning future research on the chloride transport behavior of RAC.

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Section: Chloride Penetrationmentioning

confidence: 99%

Section: Chloride Penetrationmentioning

confidence: 99%

A Review of Chloride Penetration of Recycled Concrete with Enhancement Treatment and Service Life Prediction

Wang,

Liao,

Zhang

2024

Materials

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“…Chloride permeability is the leading reason that results in the steel corrosion of reinforced concrete, and the chloride permeability is frequently quantified by the values of chloride diffusion coefficient which can be obtained by Fick's second law [74,75]. Chinese scholars have systematically investigated the chloride diffusion behavior of RAC, and Figure 5 collects testing results of relative chloride diffusion coefficient of RAC [69,[76][77][78][79][80][81][82][83][84][85][86][87][88].…”

Section: Chloride Permeabilitymentioning

confidence: 99%

“…Chloride permeability of concrete with (a) various RA contents and (b) various average water absorption rates[69,[76][77][78][79][80][81][82][83][84][85][86][87][88].…”

mentioning

confidence: 99%

Durability Studies on the Recycled Aggregate Concrete in China over the Past Decade: A Review

Yang

et al. 2019

Advances in Civil Engineering

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Since China hosted the Olympic Games in 2008, a mass of construction and demolition (C&D) wastes were produced with the rapid urbanization construction. Recycling the C&D waste into recycled aggregates (RA) is an effective method for reducing the amount of C&D wastes. Many studies on the properties of RA and the durability of recycled aggregate concrete (RAC) were conducted in China over the past decade. Due to the restrictions of various languages, some valuable studies on the durability of RAC are hard to be acquired by the scholars around the world. erefore, this paper is developed to review the studies on the durability of RAC in China, and the shrinkage behavior, chloride permeability, carbonation behavior, and freeze-thaw resistance of RAC are, respectively, introduced. Considering the waste concrete, bricks, and ceramics used in preparing RA are frequently mixed together in China, this study proposes an index of average water absorption rate to quantify the effects of RA types, quality, and replacement percentages on the durability of RAC. Meanwhile, the relationship between the average water absorption rate of RA and the durability parameters of RAC is established. Finally, the improving methods of RAC durability are introduced, and the RA particle shaping and carbonation modification are emphasized.

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“…Similar to that of NAC, the chloride diffusivity of RAC is also affected by the water-to-cement ratio (w/c) used in the mixture of RAC. The higher the w/c ratio used in RAC, the quicker the penetration of chlorides in RAC (Kou, 2006;Qin et al, 2011). Moreover, the impact of the replacement of NA on chloride penetration in RAC was (Amorim Júnior et al, 2019;Bao et al, 2020), indicating that the w/c ratio used in RAC has some effect on the improvement of the diffusivity of the RCA.…”

Section: Introductionmentioning

confidence: 99%

A Two-Step Approach for Calculating Chloride Diffusion Coefficient in Concrete with Both Natural and Recycled Concrete Aggregates

Yuan

Mao

2022

SSRN Journal

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Experimental Study on the Chloride Diffusivity of Recycled Aggregate Concrete

Cited by 3 publications

References 3 publications

A Review of Chloride Penetration of Recycled Concrete with Enhancement Treatment and Service Life Prediction

A Review of Chloride Penetration of Recycled Concrete with Enhancement Treatment and Service Life Prediction

Durability Studies on the Recycled Aggregate Concrete in China over the Past Decade: A Review

A Two-Step Approach for Calculating Chloride Diffusion Coefficient in Concrete with Both Natural and Recycled Concrete Aggregates

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