Influence of matrix cracking and hybrid fiber reinforcement on the corrosion initiation and propagation behaviors of reinforced concrete

Nguyen, Wilson; Duncan, Jacob F.; Jen, Gabriel; Ostertag, Claudia P.

doi:10.1016/j.corsci.2018.06.004

Cited by 30 publications

(12 citation statements)

References 35 publications

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“…is finding is also in accordance with that reported in [18][19][20]24]. Probably, the gain of strength for FA10 specimens attributed to delayed enhancement in strength during the later exposure period.…”

Section: Compression Strength Variationsupporting

confidence: 91%

“…Among them, sulfate expansive products such as ettringite (E), gypsum (G), and thaumasite (T) and crystallization of sulfate salt (mainly sodium sulfate) are regarded as two main hypotheses [12][13][14][15][16][17][18][19]. As for chloride-induced damage, it is generally believed that Cl − may combine with the C 3 A phase to generate Friedel's salt [20][21][22][23][24][25]. However, dedicated durability studies on the sulfate resistance of shotcrete materials mixed with fly ash (FA)/silica fume (SF) were rare.…”

Section: Introductionmentioning

confidence: 99%

“…However, durability of in situ mixing FA/SF shotcrete under sulfate-rich environments in presence of chloride ions remains to be thoroughly tested. Large number of researchers focused on chloride-induced corrosion of steel reinforcements [21,23,24]. In addition, only a few studies concerned on combined Cl − and SO 2− 4 attacking concrete materials [14,25].…”

Section: Introductionmentioning

confidence: 99%

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Degradation of Shotcrete Materials Subjected to Sulfate and Chloride Attack in Varying Exposure Regimes

Zhao

Yang

et al. 2021

Advances in Civil Engineering

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Durability of in situ shotcrete under external sulfate attack was investigated, taking into consideration the addition of mineral admixtures, along with the presence of chloride ions. Three water-to-binder ratios (w/b), i.e., 0.35, 0.45, and 0.55, and two types of supplementary cementitious materials (SCMs), namely, fly ash (FA) and silica fume (SF), were considered in the current study. Two different laboratorial immersion regimes (continuously full immersion and partial immersion with cycling temperature and relative humidity) were carried out to induce chemical/physical sulfate attack. Results show that loss of strength was the typical feature of chemical sulfate attack on shotcrete, while surface spalling dominated in deterioration caused by physical sulfate attack. The presence of chloride ions can globally mitigate these deteriorations. Meanwhile, the lower w/b ratio proved to be efficient in increasing the resistance to both sulfate attacks. Adding fly ash (FA) in shotcrete mixtures enhanced the long-term performance but invited massive white efflorescence on surface layer under partial-immersion exposure condition. Silica fume (SF) admixture can compensate the undesired reduction of early-age strength caused by FA addition, but make these specimens more susceptible to sulfate attack. Mercury intrusion porosimetry (MIP) analysis, scanning electron microscopy (SEM), and X-ray diffraction (XRD) tests reveal that these consequences were strongly related to the refinement of microstructure resulted from pozzolanic reactions and hydration kinetics.

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Section: Compression Strength Variationsupporting

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Degradation of Shotcrete Materials Subjected to Sulfate and Chloride Attack in Varying Exposure Regimes

Zhao

Yang

et al. 2021

Advances in Civil Engineering

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“…The incorporation of fine raw FA in concrete is limited by its high content of chlorides, sulfate, organic matters, and HMs, e.g., Zn, Cu, Cr, Hg, and Pb. Soluble chlorides in reinforced concrete cause steel-rebar corrosion and concrete cracking [89]. Excessive sulfates delay cement setting and concrete hardening [90,91].…”

Section: Mswi Ash Incorporation In Concrete?mentioning

confidence: 99%

Municipal Solid Waste Incineration Ash-Incorporated Concrete: One Step towards Environmental Justice

2021

Buildings

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Municipal solid waste and cement manufacture are two sources of environmental justice issues in urban and suburban areas. Waste utilization is an attractive alternative to disposal for eliminating environmental injustice, reducing potential hazards, and improving urban sustainability. The re-use and recycling of municipal solid waste incineration (MSWI) ash in the construction industry has drawn significant attention. Incorporating MSWI ash in cement and concrete production is a potential path that mitigates the environmental justice issues in waste management and the construction industry. This paper presents a critical overview of the pretreatment methods that optimize MSWI ash utilization in cement/concrete and the influences of MSWI ash on the performance of cement/concrete. This review aims to elucidate the potential advantages and limitations associated with the use of MSWI ash for producing cement clinker, alternative binder (e.g., alkali-activated material), cement substitutes, and aggregates. A brief overview of the generation and characteristics of MSWI ash is reported, accompanied by identifying opportunities for the use of MSWI ash-incorporated products in industrial-scale applications and recognizing associated environmental justice implications.

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“…The high pH of concrete pore solution promotes the formation of a passive film on the surface of steel reinforcing bars for corrosion protection [ 3 ]. However, carbonation of concrete and ingress of chloride ions from ocean water or roadway deicing salt destroy the passive film, facilitating corrosion of steel bars [ 4 , 5 ]. In general, the corrosion products are expressed as m ·Fe(OH) 2 n ·Fe(OH) 3 p ·H 2 O, where m , n , and p depend on the moisture and oxygen contents in the concrete [ 6 ].…”

Section: Introductionmentioning

confidence: 99%

Feasibility of Distributed Fiber Optic Sensor for Corrosion Monitoring of Steel Bars in Reinforced Concrete

Fan

Bao

Chen

2018

Sensors

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This study investigates the feasibility of distributed fiber optic sensor for corrosion monitoring of steel bars embedded in concrete. Two sensor installation methods are compared: (1) attaching the sensor along the bar and (2) winding the sensor on the bar. For the second method, optical fibers were winded spirally on steel bars with different spacings: 0 mm, 2 mm, 5 mm, and 10 mm. Steel bar pull-out testing was conducted to evaluate the effect of presence of distributed sensor on the bond strength of steel–concrete interface. Electrochemical testing was carried out to assess the influence of the installation methods on the corrosion resistance of the reinforced concrete. Winding the optical fiber on steel bars with a 10-mm spacing does not affect the bond strength and corrosion resistance and allows real-time corrosion monitoring. The distributed sensor data can be used to estimate the corrosion induced steel loss and predict concrete cracking.

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Influence of matrix cracking and hybrid fiber reinforcement on the corrosion initiation and propagation behaviors of reinforced concrete

Cited by 30 publications

References 35 publications

Degradation of Shotcrete Materials Subjected to Sulfate and Chloride Attack in Varying Exposure Regimes

Degradation of Shotcrete Materials Subjected to Sulfate and Chloride Attack in Varying Exposure Regimes

Municipal Solid Waste Incineration Ash-Incorporated Concrete: One Step towards Environmental Justice

Feasibility of Distributed Fiber Optic Sensor for Corrosion Monitoring of Steel Bars in Reinforced Concrete

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