Durability of Recycled Aggregate Concrete: An Overview

Xiao, Jianzhuang; Deng, Lu; Ying, Jingwei

doi:10.3151/jact.11.347

Cited by 97 publications

(31 citation statements)

References 65 publications

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“…There are many proposals based on the modeling of the attack mechanism for service life There are many proposals based on the modeling of the attack mechanism for service life prediction [3,4]. However, despite the evident importance of taking real properties into account when estimating the durability to prevent significant mistakes in the results, only some of them are based on concrete "performance" and they are called indicators of durability [5,6]. One of the durability indicators is the electrical resistivity of concrete (), inverse of conductivity, and it is a volumetric measurement of the electrolytic resistance (Re) of the material, which through Ohm's law is expressed as the ratio of voltage to applied current (Re = V/I).…”

Section: Introductionmentioning

confidence: 99%

Durability Parameters of Reinforced Recycled Aggregate Concrete: Case Study

et al. 2019

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Recycled concrete aggregate (RA) from pavement demolition was used to make concrete. Ten concrete mixtures with different replacement percentages of RA (coarse and fine) were made. The corrosion rate of steel and the electrical resistivity of concrete were determined on reinforced concrete specimens subjected to wetting-drying cycles (3.5% solution of NaCl). Corrosion rate was determined using the electrochemical technique of linear polarization resistance, while the electrical resistivity was measured by electrochemical impedance spectroscopy. The results show that the use of RA introduces more interfaces in concrete, which accelerates the steel corrosion process because the porosity increases and the electrical resistivity decreases. However, steel corrosion and the electrical resistivity in concrete are not significantly influenced by replacing a maximum 30% of coarse aggregate or 20% of fine aggregate with RA.

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Section: Introductionmentioning

confidence: 99%

Durability Parameters of Reinforced Recycled Aggregate Concrete: Case Study

et al. 2019

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“…The utilization of recycled aggregate concrete (RAC) has shown its positive influence on environment and natural resource preservation through reducing the use of non-renewable materials such as natural aggregates [ 4 , 5 , 6 , 7 ]. Such utilization also helps the recycling of construction waste.…”

Section: Introductionmentioning

confidence: 99%

Mechanical Property Tests and Strength Formulas of Basalt Fiber Reinforced Recycled Aggregate Concrete

2018

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In order to investigate the influence of basalt fibers (BFs) on the mechanical performance of recycled aggregate concrete (RAC), some groups of RAC specimens were first tested involving different types of fibers such as carbon fibers, steel fibers, polypropylene fibers and hybrid fibers. The main four indices for the investigation consisted of cube compressive strengths, axial compressive strengths, splitting tensile strengths and Young’s modulus. The effects of fiber volume fractions on the RAC slumps were also discussed. Meanwhile, the mechanical properties and failure modes of the BF-reinforced RAC were compared with those of other fiber-reinforced RAC and common concrete (CC). Subsequently the optimal volume fractions of BFs were explored for different mechanical properties within the volume fraction range of 0–0.2%. The back propagation neural networks were further applied to predict and validate the optimal BF fractions. Lastly, the general strength formulas, as well as the elastic modulus formula, for BF-reinforced RAC were deducted based on the specimen test results. It is found that the addition of fibers may improve the failure modes of RAC and different fibers present positive or negative effects on the mechanical properties. The optimal volume fractions of BF with respect to the four mechanical indices are 0.1%, 0.15%, 0.1% and 0.2% respectively. The proposed strength and elastic modulus formulas of BF-reinforced RAC provide satisfactory predictions with the test results and thus can be used as a reference in practice.

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“…This may be explained by the higher water absorption (WA) of recycled aggregate. A lot of research results show that the WA of RCA and RFA is generally 3.6%-8.0% and 8.3%-12.1% respectively, while natural rock is always lower than 3% [20]. Therefore, with the increasing replacement rate of RCA and RFA, recycled concrete is easier to damage under the inside pressure during the process of freezing and thawing, so the compressive strength decreased with the increasing contents of recycled aggregate.…”

Section: Cubic Compressive Strengthmentioning

confidence: 99%

Compressive Strength Study on the Freeze-thaw Resistance of Recycled Aggregate Concrete Members

Niu¹,

Wang²,

Zhang³

et al. 2017

TOCIEJ

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Introduction:Freeze-thaw resistance of recycled aggregate concrete with partial or total replacement of recycled aggregate compared with that of natural aggregate concrete was investigated in this paper. Method:Ninety specimens were fabricated to study the influence of different recycled aggregate replacement ratios on the surface scaling, mass loss, and residual compressive strength after 100 freeze-thaw cycles. Results:The experiment results indicate that the type of recycled aggregate and its replacement ratio have significant effects on the freezethaw performance. The cubic compressive strength of recycled aggregate concrete is overall slightly lower than that of normal concrete. After 100 freeze-thaw cycles, the compressive strength decreases and the reduction extent increases with increasing replacement rate of recycled aggregate. The surface scaling of reinforced recycled concrete prisms tends to be more severe with the increase of freeze-thaw cycles. Conclusion:Furthermore, a notable rise in mass loss and the bearing capacity loss is also found as the substitution ratio increases. Under the same replacement rate, recycled fine aggregate causes more negative effects on the freeze-thaw resistance than recycled coarse aggregate.

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Durability of Recycled Aggregate Concrete: An Overview

Cited by 97 publications

References 65 publications

Durability Parameters of Reinforced Recycled Aggregate Concrete: Case Study

Durability Parameters of Reinforced Recycled Aggregate Concrete: Case Study

Mechanical Property Tests and Strength Formulas of Basalt Fiber Reinforced Recycled Aggregate Concrete

Compressive Strength Study on the Freeze-thaw Resistance of Recycled Aggregate Concrete Members

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