Durability performance of sustainable structural concrete: Effect of coarse crushed concrete aggregate on rapid chloride migration and accelerated corrosion

Dodds, Wayne J.; Christodoulou, Christian; Goodier, Chris I.; Austin, Simon A.; Dunne, D.

doi:10.1016/j.conbuildmat.2017.08.073

Cited by 39 publications

(17 citation statements)

References 34 publications

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“…Also, the introduction of a low amount of RA (around 30% RCA or 20% RFA) does not increase the rate of steel corrosion significantly. In other publications [36,37] similar results were found.…”

Section: Corrosion Current Density Of Reinforcement Steelsupporting

confidence: 89%

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: Corrosion Current Density Of Reinforcement Steelsupporting

confidence: 89%

Durability Parameters of Reinforced Recycled Aggregate Concrete: Case Study

et al. 2019

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“…CEM III/A concrete with 100% RCA outperformed the control CEM I concrete with 100% NA. However, the replacement of GGBS and RCA should be limited to 50% and 60% respectively to conform to previous findings as stated [12].…”

Section: Durability Properties Of Racsupporting

confidence: 62%

“…Furthermore, it was estimated by the United States Environmental Protection Agency that about 136 million tons of material is generated from building works. A large portion of demolition arising from construction works in the UK, are utilized for fill and sub-base material or even low-grade concrete [12].…”

Section: Statistics and Applications Of The Use Of Rcasmentioning

confidence: 99%

A Review of Recycled Concrete Aggregates as a Sustainable Construction Material

Rampit¹,

Smith²,

Ray³

2020

Proceedings of the International Conference on Emerging Trends in Engineering &Amp; Technology (IConETech-2020)

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The recent increase in structural developments worldwide, has given rise to the consumption of natural aggregates and energy hence generating a vast amount of construction and demolition waste. Natural aggregates occupy 60-75 percent in volume of the concrete matrix. It is beneficial to recycle construction and demolition waste, for construction activities. One such material retained from construction sites is waste concrete, which can be used to produce recycled concrete aggregates (RCAs). Recycling waste concrete produces a substitute to natural aggregates and preserves the environment by reducing waste disposal at landfills and conserving energy. The use of recycled concrete aggregates has piqued the interest of many researchers by utilization of a full or partial substitution to that of natural aggregates in concrete mixtures. Over the last decade, a significant volume of literature has been published discussing the properties and microstructure of recycled concrete aggregates and its response when used in a new concrete mix. Within this paper a brief history of RCAs is outlined together with statistics on the quantity of concrete waste produced, recycled and its practical applications. A comparison between the RCA and natural aggregate properties are discussed on a microscopic level, such as the density and water absorption capacities. Further to this, a summary of the mechanical and durability parameters are discussed such as compressive, tensile and flexural strengths together with chloride ion penetration. Several pre-treatment methods such as: acid treatment and the use of fine mineral fillers are also discussed. Finally, the conclusions and gaps are stated.

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“…The values of chloride diffusion coefficient usually vary from 10 −13 m 2 /s to 10 −10 m 2 /s [31] in relation to the concrete properties such as w/cm ratio, the type and proportion of mineral admixtures and cement, the material's compaction and curing state, chloride exposure conditions, as well as the presence of cracks [32]. Currently available experimental methods for the determination of concrete's resistance to chloride ion penetration include the rapid chloride permeability test (RCPT) as shown by Marta Kosior-Kazberuk [33], the rapid chloride test (RCT) method, and the rapid chloride migration test (RMT) [10,[34][35][36][37][38][39]. Probably the most straightforward way of measuring chloride penetration is to immerse the specimens under investigation in salty solutions with different concentrations for specific periods of time depending on the needs of the experiment [40][41][42].…”

Section: Introductionmentioning

confidence: 99%

Effect of Carbon Nanotubes on Chloride Penetration in Cement Mortars

et al. 2019

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The study investigates the effect of carbon nanotubes on chloride penetration in nano-modified mortars and reports on the physical, electrical, and mechanical performance of the material. Mortars were artificially corroded and their surface electrical surface conductivity as well as flexural and compressive strength were measured. The influence of variable nanotube concentration in accelerated corrosion damage was evaluated. Nanotube concentration was found to significantly affect the permeability of the mortars; improvements in flexural and compressive response of mortars exposed to salt spray fog, compared to virgin specimens, were rationalized upon decreases in the apparent porosity of the materials due to filling of the pores with sodium chloride. Electrical resistivity was found to increase up to two orders of magnitude with respect to the surface value; above the percolation threshold, the property impressively increased up to five orders of magnitude.

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Durability performance of sustainable structural concrete: Effect of coarse crushed concrete aggregate on rapid chloride migration and accelerated corrosion

Cited by 39 publications

References 34 publications

Durability Parameters of Reinforced Recycled Aggregate Concrete: Case Study

Durability Parameters of Reinforced Recycled Aggregate Concrete: Case Study

A Review of Recycled Concrete Aggregates as a Sustainable Construction Material

Effect of Carbon Nanotubes on Chloride Penetration in Cement Mortars

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