Suitability of commercial superplasticizers for one-part alkali-activated blast-furnace slag mortar

Luukkonen, Tero; Abdollahnejad, Zahra; Ohenoja, Katja; Kinnunen, Päivö; Illikainen, Mirja

doi:10.1080/21650373.2019.1625827

Cited by 54 publications

(23 citation statements)

References 37 publications

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“…Additionally, the obtained results of initial setting time in this study are in agreement with initial setting times for cement types in British standards 197-1 [64]. Furthermore, setting times can be easily increased if needed in some applications with the aid of setting retardant agents such as lignosulfonate which was proven as a suitable retarder for one-part AAC in past studies [65]. 3.6 XRD analysis of hydration products XRD analysis was performed on pastes of samples with the highest strength (AAC3, AAC7 and AAC11) at 28 days and for longer ages (at 90 and 180 days), as presented in Fig.…”

Section: Setting Timesupporting

confidence: 85%

Long-term performance of novel high-calcium one-part alkali-activated cement developed from thermally activated lime kiln dust

Kadhim

Sadique

Al-Mufti

et al. 2020

Journal of Building Engineering

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One-part earth alkaline activated dry cementitious mixture was produced using thermally activated lime kiln dust (LKD) waste material as a source of CaO activator and metakaolin and natural pozzolan as a source of aluminasilicate • The proportion of LKD and metakaolin in the ternary blend and thermal activation of LKD not only increased the reactivity but also induced higher degree of alkali-activation.• Significant increase in the rate of strength development after 28 days of curing and continued until 180 days that reached 51 MPa for increased proportion of 950ºC calcined LKD and metakaolin in the blend was revealed.• Considerable changes in mineralogy and amorphicity were evidently accredited to thermal treatment.

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Section: Setting Timesupporting

confidence: 85%

Long-term performance of novel high-calcium one-part alkali-activated cement developed from thermally activated lime kiln dust

Kadhim

Sadique

Al-Mufti

et al. 2020

Journal of Building Engineering

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“…Over the past years, one-part geopolymers like OPC manufactured by simply adding water have attracted strong interest [ 16 , 17 ]. The production of OPAAB will enhance the commercial viability of the geopolymer and have the ability to considerably reduce CO 2 emissions compared to OPC mixtures [ 2 , 18 ]. In OPAAB, dry blends consisting of aluminosilicate precursors and solid alkaline activators are required.…”

Section: Introductionmentioning

confidence: 99%

Long-Term Strength Development of Fly Ash-Based One-Part Alkali-Activated Binders

et al. 2021

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This research aims to study the effect of the dosage of anhydrous sodium metasilicate activator on the long-term properties of fly ash-based one-part alkali-activated binders (OPAAB) cured at ambient conditions. Powdered sodium metasilicate activator was utilized in the range of 8–16% by weight of the fly ash in producing the OPAAB. The properties examined are hardened density, compressive strength, flexural strength, water absorption, efflorescence formation, and microstructural analysis. The experimental result revealed that the binders exhibited excellent long-term strength properties. The compressive strength of the OPAAP is well correlated with its hardened density. The pastes were found to exhibit good soundness characteristics over the long-term. The absorption of water decreases with an increase in the activator dosage from 8–12%, and beyond that, the water absorption relatively remains the same. Field emission scanning electron microscope (FESEM) micrograph revealed uniformly formed solid matrices with the micro-crack present were observed in the samples. The larger pore size promotes the crystallization of the resulting hydrate substances (N, C)-A-S-H gel. The initial dissolution of the OPAAP occurred within the first 30 min. At longer age of curing, mixtures with a higher dosage of powdered activator tend to absorb less water. Strength properties beyond 28 days are considered as the long-term strength.

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“…However, studies on the effect of commercial SPs on properties of ‘one-part’ geopolymers are very limited. For instance, Luukkonen et al [36] recently investigated the effect of different SPs on properties of a one-part geopolymer mortar made of slag as the source material, in conjunction of microsilica as an additional silica source, and sodium hydroxide powder as the solid activator. The authors concluded that for the investigated one-part geopolymer formulation lignosulfonate, melamine, and naphthalene-based SPs were more effective than polyacrylate and polycarboxylate-based SPs.…”

Section: Introductionmentioning

confidence: 99%

Efficiency of Different Superplasticizers and Retarders on Properties of ‘One-Part’ Fly Ash-Slag Blended Geopolymers with Different Activators

2019

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Currently, there are a very limited number of studies on the effect of admixtures on properties of ‘one-part’ geopolymers. This paper reports the effects of different superplasticizers and retarders on fresh and hardened properties of one-part fly ash-slag blended geopolymers made by different solid activators. Two different grades of sodium silicate, namely anhydrous sodium metasilicate powder (nSiO2/nNa2O = 0.9) and GD Grade sodium silicate powder (nSiO2/nNa2O = 2.0) were used as the solid activators. Five different commercially available superplasticizers, including three modified polycarboxylate-based superplasticizers (denoted as PC1, PC2, and PC3) and two naphthalene-based superplasticizers (denoted as N1 and N2), as well as three different retarders, including sucrose, anhydrous borax and a commercially available retarder, were investigated. Workability, setting time and compressive strength of the mixtures without and with addition of each ‘individual’ admixture were measured. The results showed the effect of admixtures on the properties of the one-part geopolymers significantly depended on the type of solid activator and the type of admixture used. When GD Grade sodium silicate powder was used as the solid activator, all investigated admixtures not only had no positive effect on the workability and setting time, but also significantly reduced the compressive strength of the mixture. However, when anhydrous sodium metasilicate powder was used as the solid activator, the PC1 and sucrose were the best performing superplasticizer and retarder, respectively, causing no reduction in the compressive strength, but significant increase in the workability (up to + 72%) and setting time (up to + 111%), respectively as compared to the mixture with no admixture. In addition, the results also showed that addition of ‘combined’ admixtures (i.e., PC1 in the presence of sucrose) significantly increased the workability (up to + 39%) and setting time (up to + 141%), but slightly reduced the compressive strength (−16%) of the mixture activated by anhydrous sodium metasilicate powder, as compared to the mixture with no admixture.

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Suitability of commercial superplasticizers for one-part alkali-activated blast-furnace slag mortar

Cited by 54 publications

References 37 publications

Long-term performance of novel high-calcium one-part alkali-activated cement developed from thermally activated lime kiln dust

Long-term performance of novel high-calcium one-part alkali-activated cement developed from thermally activated lime kiln dust

Long-Term Strength Development of Fly Ash-Based One-Part Alkali-Activated Binders

Efficiency of Different Superplasticizers and Retarders on Properties of ‘One-Part’ Fly Ash-Slag Blended Geopolymers with Different Activators

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