Chloride ion permeability improvement of recycled aggregate concrete using pretreated recycled aggregates by silica fume slurry

Sasanipour, Hossein; Aslani, Farhad; Taherinezhad, Javad

doi:10.1016/j.conbuildmat.2020.121498

Cited by 54 publications

(27 citation statements)

References 53 publications

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“…e chloride ion diffusion coefficient of concrete indicates the ability to resist the chloride ion permeability. When the chloride ion diffusion coefficient increased, the chloride ion diffused in concrete more easily, meaning the chloride ion permeability resistance of concrete decreased [46]. It can be seen from Figure 1 that for both C30 and C50 concrete, the chloride ion diffusion coefficient of concrete decreased gradually with the increase of LDH content, indicating that the chloride ion permeability resistance of concrete increased.…”

Section: Chloride Ion Corrosion Resistance Of Concretementioning

confidence: 95%

Experimental Investigation of MgAl‐NO₂ and MgAl‐CO₃ LDHs on Durability of Mortar and Concrete

Wang

et al. 2021

Advances in Materials Science and Engineering

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Two kinds of layered double hydroxides (LDHs), MgAl-NO2 (N-LDH) and MgAl-CO3 (C-LDH), were incorporated to study the durability of mortar and concrete. The LDH contents of mortar were 1%, 2%, and 4% by mass and the LDH contents of concrete were 0.5%, 1%, 2%, 4%, respectively. The effect of LDHs on sulfate resistance of mortar was studied through dry-wetting cycle test, compressive strength test, and flexural strength test. In addition, the effects of LDHs on pore structure, chloride resistance, carbonation resistance, shrinkage, and creep of concrete were investigated by SEM, mercury injection test, XRD, chloride ion diffusion coefficient test, chloride salt corrosion depth test, carbonation depth test, shrinkage test, and creep test. The results showed that LDHs can improve the ability of resisting ion corrosion, carbonization, shrinkage, and creep, reduce the pore content, and optimize the pore structure of mortar and concrete to some extent. Moreover, 4% LDHs had a better effect on improving the durability of mortar and concrete compared to 0.5%, 1%, and 2% LDHs, and the effect of C-LDH was better than N-LDH.

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Section: Chloride Ion Corrosion Resistance Of Concretementioning

confidence: 95%

Experimental Investigation of MgAl‐NO₂ and MgAl‐CO₃ LDHs on Durability of Mortar and Concrete

Wang

et al. 2021

Advances in Materials Science and Engineering

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“…It was found that the broken brick aggregate concrete demonstrated better mechanical properties and higher resistance to chloride ion migration after being treated with a cement-coal fly ash slurry via soaking for 4 h. Compared with before modification, the compressive strength of the brick aggregate concrete increased by 22–34% after modification. Hossein et al [ 26 ] improved the durability of recycled concrete aggregate concrete by soaking it in silica fume paste. The results showed that the water absorption of recycled aggregates decreased by 14–22%, and the resistivity increased significantly after modification with silica fume paste.…”

Section: Introductionmentioning

confidence: 99%

Effect of Superfine Cement Modification on Properties of Coral Aggregate Concrete

et al. 2023

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In marine engineering, using corals as aggregates to prepare concrete can reduce both the exploitation of stones and the transportation cost of building materials. However, coral aggregates have low strength and high porosity, which may affect the workability and mechanical properties of concrete. Hence, superfine cement is used innovatively in this study to modify coral aggregates; additionally, the effects of the water–cement ratio and curing time on the water absorption and strength of modified coral aggregates are investigated. Modified coral aggregate concrete is prepared, and the effect of using modified superfine cement on its workability and strength is investigated. Experimental results show that when the water-cement ratio exceeds 1.25, the slurry does not form a shell on the surface of the coral aggregates and the water absorption of the coral aggregates increases significantly. The strength of the modified coral aggregates cured for a short duration is slightly lower than that of unmodified coral aggregates, whereas that cured for 28 days is approximately 20% higher than that of unmodified coral aggregates. Using superfine cement to modify coral aggregate concrete can improve its workability, but not its compressive properties.

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“…To increase the use of RCA and RMA in concrete, efforts have been made in recent years to improve the quality of RCA and RMA by using various treatments. These include the use of accelerated carbonation (Pu et al, 2021), polymer (Spaeth and Tegguer, 2013), and silica fume slurry (Sasanipour et al, 2021) treatments to improve the quality of the adhered mortar and interfacial transition zone (ITZ) between the mortar and aggregate in the RCA. The results obtained from the tests carried out in laboratories demonstrated that the quality of the RCA can be significantly improved by using chemical or mechanical pre-treatments and the corresponding mechanical properties of the RAC mixed using pre-treated RCA are comparable with those of natural aggregate concrete (NAC) (Wang et al, 2021).…”

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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Chloride ion permeability improvement of recycled aggregate concrete using pretreated recycled aggregates by silica fume slurry

Cited by 54 publications

References 53 publications

Experimental Investigation of MgAl‐NO₂ and MgAl‐CO₃ LDHs on Durability of Mortar and Concrete

Experimental Investigation of MgAl‐NO₂ and MgAl‐CO₃ LDHs on Durability of Mortar and Concrete

Effect of Superfine Cement Modification on Properties of Coral Aggregate Concrete

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

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Chloride ion permeability improvement of recycled aggregate concrete using pretreated recycled aggregates by silica fume slurry

Cited by 54 publications

References 53 publications

Experimental Investigation of MgAl‐NO2 and MgAl‐CO3 LDHs on Durability of Mortar and Concrete

Experimental Investigation of MgAl‐NO2 and MgAl‐CO3 LDHs on Durability of Mortar and Concrete

Effect of Superfine Cement Modification on Properties of Coral Aggregate Concrete

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

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Experimental Investigation of MgAl‐NO₂ and MgAl‐CO₃ LDHs on Durability of Mortar and Concrete

Experimental Investigation of MgAl‐NO₂ and MgAl‐CO₃ LDHs on Durability of Mortar and Concrete