Chloride diffusion in ordinary, blended, and alkali-activated cement pastes and its relation to other properties

Roy, Della M.; Jiang, Weimin; Silsbee, M. R.

doi:10.1016/s0008-8846(00)00406-3

Cited by 156 publications

(51 citation statements)

References 6 publications

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“…The mortar and concrete manufactured in Colombia with national alkali-activated blast furnace slag (GBFS) as the sole cementitious material have been shown to have high mechanical strength and durability (8)(9)(10)(11)(12), a behaviour consistent with the findings reported by other researchers (7,(13)(14)(15)(16). Nonetheless, according to the literature (16)(17)(18)(19)(20)(21)(22), one of the most severe limitations to the use of alkaline-activated slag cement is its high shrinkage rate, particularly when the activator used is waterglass.…”

Section: Introductionsupporting

confidence: 80%

“…En Colombia, a partir de procesos de activación alcalina, ha sido posible la producción de morteros y hormigones, utilizando como único material cementante una escoria siderúrgica nacional de alto horno (GBFS); los cuales, poseen excelentes propiedades mecánicas y de durabilidad (8)(9)(10)(11)(12), y un comportamiento coherente con lo encontrado por otros investigadores (7,(13)(14)(15)(16). Sin embargo, una de las limitaciones más importantes para el uso de los cementos alcalinos, basados en escorias activadas, que se ha encontrado en la literatura (16)(17)(18)(19)(20)(21)(22) es su elevada susceptibilidad a sufrir fenómenos de retracción, particularmente cuando el activador es waterglass.…”

Section: Introductionunclassified

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Comportamiento mecánico de hormigones de escoria activada alcalinamente reforzados con fibras de acero

Bernal¹,

Gutiérrez²,

Rodríguez³

et al. 2009

Mater. construcc.

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Section: Introductionsupporting

confidence: 80%

Section: Introductionunclassified

Comportamiento mecánico de hormigones de escoria activada alcalinamente reforzados con fibras de acero

Bernal¹,

Gutiérrez²,

Rodríguez³

et al. 2009

Mater. construcc.

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“…In this respect, the most promising emerging approach is based on raw materials suitable for alkaline activation, which originate new binding materials generically known as alkaline cements 11,12 . The use of slag as supplementary cementitious material improves the durability of concrete as it reduces the chloride penetration achieved by GBFS has been confirmed by many different investigators 13,14 . The aim of this paper is to study the corrosion properties of steel rebars embedded in alkaline active slag and exposed 3.5% NaCl solution by weight of the slag.…”

Section: Introductionmentioning

confidence: 81%

Corrosion of reinforcing bars embedded in alkali-activated slag concrete subjected to chloride attack

2011

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Steel bar embedded in an alkali-activated slag (AAS) concrete was tested under complete immersion, in 3.5% NaCl solution by weight of the slag. Ordinary Portland cement (OPC) was also tested for comparative purposes and exposed to the same solution. Monitoring of open-circuit potential, polarization resistance measurement and electrochemical impedance spectroscopy (EIS) were used to evaluate the corrosion behavior of steel bar. The corrosion resistances of AAS and OPC concretes were performed at 0, 3, 6, 9 and 12 months. Electrochemical measurements shows that AAS concrete presents passive corrosion behavior the first 3 months, after this period of time, it presents corrosion resistance decreased due to the chlorides presence at the steel/AAS interface. For 0 months immersion (28 days of curing) the AAS and OPC concretes presented a 10% of corrosion probability. After 3 months of immersion the tested AAS and OPC concretes showed similar behavior, the active potentials in the range from −0.2 to −0.6 V vs. Cu/CuSO 4, indicate a 90% probability of corrosion.

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“…Result of ability to resist chloride ion penetration 한편 Table 9와 Table 9. Chloride ion penetrability based on charge passed [17,18] 아직까지 명확하고 충분한 원인의 규명은 부족하지만 기 존의 연구 [20,30,31,32] …”

Section: 사용재료unclassified

An Experimental Study on the Chloride Attack Resistibility of Alkali-Activated Ternary Blended Cement Concrete

Yang¹,

Hwang²,

Jeon³

et al. 2016

Journal of the Korea Institute of Building Construction

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The use of ternary blended cement consisting of Portland cement, granulated blast-furnace slag (GGBFS) and fly ash has been on the rise to improve marine concrete structure's resistance to chloride attack. Therefore, this study attempted to investigate changes in chloride attack resistibility of concrete through NT Build 492-based chloride migration experiments and test of concrete's ability to resist chloride ion penetration under ASTM C 1202(KS F 2271) when 1.5-2.0% of alkali-sulfate activator (modified alkali sulfate type) was added to the ternary blended cement mixtures (40% ordinary Portland cement + 40% GGBFS + 20% fly ash). Then, the results found the followings: Even though the slump for the plain concrete slightly declined depending on the use of the alkali-sulfate activator, compressive strength from day 2 to day 7 improved by 17-42%. In addition, the coefficient from non-steady-state migration experiments for the plain concrete measured at day 28 decreased by 36-56% depending on the use of alkali-sulfate. Furthermore, total charge passed according to the test for electrical indication of concrete's ability to resist chloride ion penetration decreased by 33-62% at day 7 and by 31-48% at day 28. As confirmed in previous studies, reactivity in the GGBFS and fly ash improved because of alkali activation. As a result, concrete strength increased due to reduced total porosity.

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Chloride diffusion in ordinary, blended, and alkali-activated cement pastes and its relation to other properties

Cited by 156 publications

References 6 publications

Comportamiento mecánico de hormigones de escoria activada alcalinamente reforzados con fibras de acero

Comportamiento mecánico de hormigones de escoria activada alcalinamente reforzados con fibras de acero

Corrosion of reinforcing bars embedded in alkali-activated slag concrete subjected to chloride attack

An Experimental Study on the Chloride Attack Resistibility of Alkali-Activated Ternary Blended Cement Concrete

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