Study on chloride transport performance of eco-friendly coral aggregate concrete in marine environment

Huang, Daguan; Niu, Ditao; Zheng, Hao; Su, Li; Luo, Daming; Fu, Qiang

doi:10.1016/j.conbuildmat.2020.120272

Cited by 41 publications

(21 citation statements)

References 8 publications

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“…Physical and Chemical Interactions Between Pore Solution and Cement Hydrate Chloride in CAC exists in two forms: free chloride in the pore solution and bound chloride by cement hydrate. When external chloride penetrates CAC, it will cause physical and chemical interactions between the pore solution and cement hydrate, and the amount of chloride bound by the cement hydrate will increase (Huang et al, 2020a), significantly affecting the ionic transport in CAC. The physical and chemical interactions include the adsorption between the surface silanol sites (≡SiOH) of calcium silicate hydrate (C−S−H) and the aqueous species in the pore solution, and the dissolution/precipitation reactions of hydrate phases (Elakneswaran et al, 2010;Tran et al, 2018).…”

Section: Reactive Transport Modelling Of Chloride Ingress In Cacmentioning

confidence: 99%

“…Coral reefs contain chloride salt (Yu et al, 2020). When coral reefs are used as coarse or fine aggregates, the chloride salt will inevitably be mixed into concrete (Da et al, 2016;Huang et al, 2020a;Zhang et al, 2020). Hence, corrosion of reinforcing steel embedded in coral aggregate concrete (CAC) is supposed to be more serious than that of ordinary aggregate concrete (OAC).…”

Section: Introductionmentioning

confidence: 99%

“…The experimental results in (Yu et al, 2017) indicated that the free chloride concentration is much higher in OAC than CAC when exposed to the same chloride environment. Da et al (2016) and Huang et al (2020a) found that the surface chloride concentration in CAC and its apparent chloride diffusion coefficient were higher than those of OAC.…”

Section: Introductionmentioning

confidence: 99%

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Reactive Transport Modelling of Chloride Ingress in Saturated Coral Aggregate Concrete

Guo

et al. 2021

Front. Mater.

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Utilizing coral aggregate concrete (CAC) for construction on remote islands can significantly reduce construction cost and period, CO2 emission, and consumption of non-renewable energy. The durability of reinforced CAC structures is critically influenced by their resistance to chloride attack. In this study, a reactive transport modelling was developed to investigate chloride ingress in CAC, in which a COMSOL-PHREEQC interface based on MATLAB language was established. The experiment from the literature was taken as a benchmark example. The results show that the developed numerical model can accurately predict chloride transport in CAC. Differing from ordinary aggregate concrete (OAC), Kuzel’s salt does not appear in cement hydrate compounds of CAC during chloride ingress. The numerical results indicate that the penetration depth of chloride in CAC gradually increases as the exposure time is prolonged. When CAC is exposed to an external chloride solution, the decrease in the pH of the pore solution affects the precipitation of Friedel’s salt, which is detrimental to the chemical binding of chloride.

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Section: Reactive Transport Modelling Of Chloride Ingress In Cacmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Reactive Transport Modelling of Chloride Ingress in Saturated Coral Aggregate Concrete

Guo

et al. 2021

Front. Mater.

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“…The interfacial bond damage variable D is analysed by adopting the area definition method, as shown in Equation 7. (7) where A s ′ is the reduction in the effective bonding interface area of CFRP-reinforced coral concrete; and A d is the effective interface area of CFRP-reinforced coral concrete after dry-wet cycling.…”

Section: Bond-slip Model Considering Damage Effects For Cfrp-reinforced Coral Concrete Interfacesmentioning

confidence: 99%

“…Since coral aggregate contains a large amount of chloride ions [7], steel bars easily corrode in concrete. How to avoid the deterioration of the coral concrete durability caused by reinforcement corrosion has attracted much attention.…”

Section: Introductionmentioning

confidence: 99%

Effects of Wet-Dry Alternation of Ocean Tide Environments on the Bond Behaviour of CFRP-Reinforced Coral Concrete

Wu¹

2021

Ceramics - Silikaty

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In this paper, the dry-wet cycle test in NaCl solutions is used to simulate ocean tide attack, and the pull-out test is carried out to explore the changes in the bond behaviour of CFRP-reinforced coral concrete under the attack of the simulated ocean tide environment. As shown by the results, with the increase in the number of dry-wet cycles, the bond strength of CFRPreinforced coral concrete will first increase and then decrease. Based on damage mechanics theory, the deterioration of the interfacial bond properties between CFRP bars and coral concrete under the attack of the ocean tide environment is analysed. By fitting the obtained data, the bond-slip equation of the CFRP-reinforced coral concrete with different damage degrees is obtained, and the related bond-slip constitutive model considering damage effects is established.

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Compressive strength, water and chloride transport properties of early CO2-cured Portland cement-fly ash-slag ternary mortars

Song

Liu

Xiang

et al. 2022

Cement and Concrete Composites

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Study on chloride transport performance of eco-friendly coral aggregate concrete in marine environment

Cited by 41 publications

References 8 publications

Reactive Transport Modelling of Chloride Ingress in Saturated Coral Aggregate Concrete

Reactive Transport Modelling of Chloride Ingress in Saturated Coral Aggregate Concrete

Effects of Wet-Dry Alternation of Ocean Tide Environments on the Bond Behaviour of CFRP-Reinforced Coral Concrete

Compressive strength, water and chloride transport properties of early CO2-cured Portland cement-fly ash-slag ternary mortars

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