Chloride corrosion of steel rebars in mortars with fly ash admixtures

Kouloumbi, N.; Batis, G.

doi:10.1016/0958-9465(92)90014-m

Cited by 54 publications

(32 citation statements)

References 4 publications

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“…Due to carbonation and chloride penetration the passive layer around the reinforcing steel is destroyed, leaving the steel bar unprotected to the effect of corrosion. One method of protection is the corrosion inhibitors [2].…”

Section: Introductionmentioning

confidence: 99%

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Protection Systems for Reinforced Concrete with Corrosion Inhibitors

Zacharopoulou¹,

Zacharopoulou²,

Batis³

2014

OJMetal

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This paper examines the use of corrosion inhibitors in order to protect the reinforcement of concrete. For this purpose mortar specimens were constructed with or without corrosion inhibitors and were partially immersed in sodium chloride. Corrosion inhibitors were used as admixture into concrete and were sprayed on the external surface of mortar specimens. In all mortar specimens, electric junction between reinforcements was achieved. The methods that were used for the evaluation of the reinforcement corrosion in concrete, included half-cell potential measurements, polarization curves of reinforced rebars and mass loss of the reinforcement. Finally, the durability of concrete after the use of corrosion inhibitors was also examined.

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Section: Introductionmentioning

confidence: 99%

“…This can be accomplished potentiostatically by changing the potential of the reinforcing steel by a fixed amount, ΔE, and monitoring the current decay, ΔI, after a fixed time. The polarization resistance, R p , of the steel is then calculated from the equation [2]. …”

Section: Linear Polarization Techniquementioning

confidence: 99%

Protection Systems for Reinforced Concrete with Corrosion Inhibitors

Zacharopoulou¹,

Zacharopoulou²,

Batis³

2014

OJMetal

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“…In Europe, fly ash is most commonly used for the production of cement and concrete, for the construction of embankments, for soil replacement, etc. [2]. The widest use of fly ash is in the production of cement because it exhibits pozzolanic properties [3,4].…”

Section: Introductionmentioning

confidence: 99%

Physicomechanical properties of fly ash applicable in road construction

2017

JCE

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Physico-mechanical properties of fly ash applicable in road constructionAn experimental research of physico-mechanical properties of fly ash and ash stabilized with lime and cement, as used in road construction, is presented in the paper. The binder was added in the proportion of 2, 4 and 6 % of the total quantity of fly ash. The testing revealed that ash samples with and without binder can be used for improvement of foundation soil and for construction of embankments and subgrade layers, but are not recommended for construction of subbase and base courses. The research is based on the use of fly ash for road construction, i.e. as a substitute for natural materials in construction industry, as this use would save natural resources whose reserves are limited. Fizikalno-mehanička svojstva letećeg pepela primjenjivog pri građenju cesta U radu je prikazano eksperimentalno istraživanje fizikalno-mehaničkih svojstava letećeg pepela i stabiliziranog pepela s dodatkom vapna i cementa primjenjivog za gradnju cesta. Vezivo je dodavano sa 2, 4 i 6 % u odnosu na ukupnu količinu letećeg pepela. Nakon izvršenih ispitivanja uočljivo je da uzorci pepela bez dodataka i s dodatkom veziva mogu koristiti za izradu temeljnog tla, nasipa i posteljice, dok za izradu nosivih slojeva nisu preporučljivi. Istraživanje se temelji na korištenju letećeg pepela za izgradnju cesta, odnosno kao zamjena prirodnim materijalima u građevinarstvu, pri čemu se štede prirodni resursi čije su rezerve ograničene.

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“…Carbonation, being a rather slow process, induces rebar corrosion only in concrete structures with very thin concrete cover and high porosity, shrinkage cracks and so forth [8]. The steel rebars corrosion onset, the time interval before the attack starts and the rate by which it proceeds, are dependent on factors influenced by the chemistry of cement, mineral admixture additions and water to binder ratio, curing and environmental conditions [4,6,[9][10][11]. The durability of a material or structure refers to its ability to withstand the environmental conditions to which it is exposed.…”

Section: Introductionmentioning

confidence: 99%

“…In sea water, the penetration of chloride ions is faster than that of CO 2 and makes the CO 2 influence weaker [6]. The presence of chloride ions raises the pH required to stabilize the passive film to a value which may exceed that of a saturated calcium hydroxide solution, so stimulating corrosion [1].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Cementitious Repair Mortars for Corrosion Resistance

Saraswathy¹,

Song²

2007

Port. Electrochim. Acta

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Repair and rehabilitation of deteriorated concrete structures are essential not only to utilize them for their intended service life, but also to assure the safety and serviceability of the associated components. A good repair improves the function and performance of the structure, thus prevents ingress of aggressive species to the steel/concrete interface and improves its durability. It is important to evaluate the performance of repair materials available for repairing the deteriorated concrete structures. This investigation was carried out to evaluate the durability characteristics of five types of modified cement based repair mortars. The corrosion resistance of the repair materials was evaluated by conducting various tests such as water absorption, rapid chloride ion penetration test, impressed voltage, 90 days ponding test, macro cell corrosion test, weight loss measurement, etc. Details of the test and their results were discussed. It is concluded that the modified cement based repair mortars formulated with different mineral admixtures (fly ash and/or silica fume) showed improved corrosion resistance.

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Chloride corrosion of steel rebars in mortars with fly ash admixtures

Cited by 54 publications

References 4 publications

Protection Systems for Reinforced Concrete with Corrosion Inhibitors

Protection Systems for Reinforced Concrete with Corrosion Inhibitors

Physicomechanical properties of fly ash applicable in road construction

Evaluation of Cementitious Repair Mortars for Corrosion Resistance

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