Corrosion performance of embedded steel in fly ash geopolymer concrete by impressed voltage method

Olivia, Monita; Nikraz, Hamid

doi:10.1201/b10571-141

Cited by 13 publications

(8 citation statements)

References 1 publication

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“…This is slightly different from samples where the continuous reaction between alkali activator and un-reacted fly ash particle gradually occurred with the presence of both cation Na + as shield solution and ion Clingress to the pores. A similar result was observed by Olivia and Nikraz [20]. When geopolymer concrete was cured at 60 o C -75 o C, geopolymer concrete showed better mechanical properties than OPC concrete and lower porosity, but chloride ion concentration was found much higher in geopolymer concrete.…”

Section: Chloride Penetrationsupporting

confidence: 73%

The effect of steam curing on chloride penetration in geopolymer concrete

Ekaputri

Mutiara

Nurminarsih³

et al. 2017

MATEC Web Conf.

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Abstract. In this paper, we present the result of our study on the effect of steam curing to chloride ion penetration in geopolymer concrete. Class F fly ash was activated using sodium hydroxide (NaOH) and sodium silicate (Na2SiO3). The concrete specimens were then steam-cured at 40ºC, 60ºC, 80ºC and room temperature at 24 hours. The treatment was followed by wet curing for 28 days, and then followed by immersion of all specimens in salt water for the durations of 30, 60, and 90 days. Cylindrical specimens were then prepared for compressive strength, chloride ion penetration, pH, and porosity tests. A 16 mm-steel bar was fixed at the center of the specimen concrete blocks (specimen size: 10cm x 10cm x 15cm). Corrosion probability was determined by conducting Half Cell Potential test. Our result showed that increasing the curing temperature to 80ºC induced chloride ion penetration into the concrete's effective pores, despite improvements in compressive strength. We also found that chloride ingress on the geopolymer concrete increases commensurately with the increase of the curing temperature. The corrosion potential measurement of geopolymer concrete was higher than OPC concrete even if corrosion was not observed in reinforcing. Based on our result, we suggest that the corrosion categorization for geopolymer concretes needs to be adjusted.

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Section: Chloride Penetrationsupporting

confidence: 73%

The effect of steam curing on chloride penetration in geopolymer concrete

Ekaputri

Mutiara

Nurminarsih³

et al. 2017

MATEC Web Conf.

View full text Add to dashboard Cite

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“…Lower permeability gives higher resistance to the ingress of aggressive ions into the concrete and thereby reduces the extent of deterioration of concrete. Heat-cured fly ash based geopolymer concrete has high compressive strength and tensile strengths, and low effective porosity, which are all beneficial for concrete in an aggressive environment (Olivia and Nikraz, 2011).…”

Section: Introductionmentioning

confidence: 99%

Properties Of Fly Ash And Slag Blended Geopolymer Concrete Cured At Ambient Temperature

Deb

Nath

Sarker

2013

Proceedings of the New Developments in Structural Engineering and Construction

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The properties of concrete using fly ash based geopolymer as the binder were shown in recent studies. However, most of the previous studies focused on the properties of geopolymer concrete samples cured at high temperature. In this study, fly ash based geopolymer concrete suitable for curing at ambient temperature was designed and some durability properties were investigated. Geopolymer mixtures were prepared with fly ash as the primary binder which was activated by a mixture of sodium silicate and sodium hydroxide solutions. Ground granulated blast furnace slag (GGBFS) was added as 0%, 10% and 20 % of the total binder. Samples were also cast from an ordinary Portland cement (OPC) concrete mixture in order to compare with the properties of geopolymer and OPC concretes. All the concrete samples were ambient-cured (15-20 o C) after casting until tested. The tests conducted include compressive strength, drying shrinkage, sorptivity and volume of permeable voids (VPV) test. The strength of the geopolymer concretes enhanced from the early age and continued to develop in similar trend as OPC concrete. Strength increased with the increase of slag in the mixture. The geopolymer concretes showed drying shrinkage, sorptivity and VPV values comparable to those of the control OPC concrete. In general, the results show that it is possible to design fly ash and slag blended geopolymer concrete suitable for ambient curing with similar or better durability properties of conventional OPC concrete.

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“…However mixtures having 35% solution with extra water showed higher sorptivity as compared to those having 40% solution with no extra water. The sorptivity values can be improved by a decrease in the water content and an increase in binder content [13]. Papworth and grace (1985) [14] recommended the typical values of sorptivity for various performances of concrete.…”

Section: Flexural Strengthmentioning

confidence: 99%

Strength and Permeation Properties of Slag Blended Fly Ash Based Geopolymer Concrete

Deb

Nath

Sarker

2013

AMR

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Abstract. Geopolymer is a binder that can act as an alternative of Portland cement. Geopolymers use by-product substances such as fly ash, and can help reduce carbon di oxide emission of concrete production. This paper presents the results of a study on the fly ash based geopolymer concrete suitable for curing at ambient temperature. To activate the Silicon and Aluminium content in fly ash, a combination of sodium hydroxide and sodium silicate solutions was used. The setting and hardening of geopolymer concrete were obtained by blending blast furnace slag with fly ash instead of using heat curing. Ground granulated blast furnace slag was used at the rate of 10% or 20 % of the total binder. The tests conducted include compressive strength, tensile strength, flexure strength, sorptivity and volume of permeable voids (VPV) test. The geopolymer concrete compressive strength at 28 days varied from 27 to 47 MPa. Results indicated that the water absorption decreased with an increase of the slag content in the mixtures and eventual increase in strength of the geopolymer concrete. The results show that blending of slag with fly ash in geopolymer concrete improved strength and permeation properties when cured in ambient temperature.

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Corrosion performance of embedded steel in fly ash geopolymer concrete by impressed voltage method

Cited by 13 publications

References 1 publication

The effect of steam curing on chloride penetration in geopolymer concrete

The effect of steam curing on chloride penetration in geopolymer concrete

Properties Of Fly Ash And Slag Blended Geopolymer Concrete Cured At Ambient Temperature

Strength and Permeation Properties of Slag Blended Fly Ash Based Geopolymer Concrete

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