Hydration of Hybrid Cements at Low Temperatures: A Study on Portland Cement-Blast Furnace Slag—Na2SO4

Joseph, Shiju; Çizer, Özlem

doi:10.3390/ma15051914

Cited by 12 publications

(20 citation statements)

References 63 publications

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“…Joseph and Cizer reported much higher ettringite contents (>10% wt.) when a commercial CEM III B (additional amount of gypsum) was activated with sodium sulfate.…”

Section: Resultsmentioning

confidence: 98%

“…The absorption of sulfate on the C 3 A and mainly C(-A)-S-H phases is reported as the controlling mechanism. Nevertheless, it is worth pointing out the influence of the curing temperature on the evolution of these Al-rich phases where factors such as the pretreatment of the sample may lead to significant variations in the content of ettringite as well. , These make the comparison among different studies challenging, and in hybrid alkali-activated cements where both gypsum and sodium sulfate are present, further studies are necessary to elucidate the effect of the different sulfate sources at different stages of reaction depending on the dosage of the activator.…”

Section: Resultsmentioning

confidence: 99%

“…These zones are identified for both SS0 and SS8. In addition, a larger (but still low) amount of hydrotalcite (in the order of 1.5 g/100 g anhydrous binder) was reported as hydration progresses …”

Section: Resultsmentioning

confidence: 99%

“…This highlighted the secondary role played by the GGBFS on setting in the hybrid alkali-activated cements studied. Joseph and Cizer evaluated the influence of the curing temperature on the hydration products and mechanical properties of a commercial CEM III/B with and without sodium sulfate. An increased ettringite formation at all curing ages, along with a densification of hydrates, was reported with the sodium sulfate addition.…”

Section: Introductionmentioning

confidence: 99%

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Phase Evolution of Hybrid Alkali Sulfate-Activated Ground-Granulated Blast Furnace Slag Cements

Etcheverry,

Yue,

Krishnan

et al. 2023

ACS Sustainable Chem. Eng.

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In this study, a hybrid alkali-activated groundgranulated cement consisting of 70% blast furnace slag (GGBFS) and 30% Portland cement (PC) activated with sodium sulfate was studied. Results were compared with those of a blended system without an activator. The addition of the activator significantly increased the kinetics and degree of reaction of these cements, particularly at early curing ages (2 days), without leading to significant changes in the phase assemblage. The main reaction product formed was an aluminum-substituted calcium silicate hydrate (C-A-S-H) type gel, with a Ca/Si ratio comparable to that of the activator-free blended cement; however, in the presence of the activator, sorption of sulfur was observed in the C-A-S-H phase. The formation of secondary phases including ettringite and Ca-or Mg-rich layered double hydroxides was also identified in these cements depending on the curing age and activation addition. This study demonstrates the effectiveness of sodium sulfate in accelerating the phase assemblage evolution in high-GGBFS-content PCblended cements without leading to significant changes in the reaction products formed, particularly at advanced curing ages. This represents a step forward in the development of cements with a reduced clinker factor.

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“…Joseph and Cizer reported much higher ettringite contents (>10% wt.) when a commercial CEM III B (additional amount of gypsum) was activated with sodium sulfate.…”

Section: Resultsmentioning

confidence: 98%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Phase Evolution of Hybrid Alkali Sulfate-Activated Ground-Granulated Blast Furnace Slag Cements

Etcheverry,

Yue,

Krishnan

et al. 2023

ACS Sustainable Chem. Eng.

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“…Accelerators are more critical when curing concrete in cold weather conditions, as strength development is considerably dependent on the curing temperature. 14 They could also benefit precast plants, where fast demolding will increase production. Accelerators also have colossal significance in concrete 3D printing applications as rapid strength development is required after the extrusion-based printing of concrete to ensure sufficient buildability.…”

Section: Introductionmentioning

confidence: 99%

Effect of nanoparticles on the hydration of NaOH‐activated GGBFS

Joseph,

Unluer

2023

J Am Ceram Soc.

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The effect of nanoparticles and nucleation seeds on the hydration kinetics of alkali‐activated materials is not well understood. Implications of nano‐TiO2 (nTiO2) and C–S–H nucleation seeds (XSeed) on the early‐age hydration and later‐age properties of sodium hydroxide‐activated ground granulated blast furnace slag were investigated. The effect of NaOH concentration (0.5, 1, 2, and 4 M) in the activator solution was reported. Results indicated the acceleration of early hydration kinetics with mixes of XSeed and nTiO2 when the concentration of the activator solution was 0.5/1 M. No considerable effects were noted with XSeed addition for 2/4 M, whereas there was an acceleration with the addition of nTiO2. These differences were attributed to the lack of dispersion of XSeed at higher activator concentrations. Hydrate phase assemblage did not change with the addition of nanoparticles by 28 days of hydration. Increase in strength, along with pore refinement, was observed with the incorporation of nanoparticles.

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Creep of Slag Blended Cement Concrete with and Without Activator

Thanh

Tapas

Chandler³

et al. 2023

Lecture Notes in Civil Engineering

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Partly replacing Portland cement (PC) with lower carbon footprint cementitious materials such as ground granulated blast furnace slag (slag) is considered as a practical method for reducing CO2 emissions in the cement concrete industry. To mitigate the slow reactivity of slag in a cementitious system and enhance early-age strength, the addition of a chemical activator is a solution. However, the effect of the activator on creep behaviour of slag-blended cement concretes remains unclear. This work presents the effect of sodium sulfate (Na2SO4) activator on the compressive creep of PC concrete blended with 50 and 70 wt% slag. Four concrete mixes (with and without 2.5% Na2SO4 activator) containing 395 kg of cementitious material were prepared. The creep strain measurements were conducted on 150 × 300 mm cylindrical specimens for 140 days under sustained compressive load. The results showed that the 70% slag concrete had lower creep strain than 50% slag-blended cement concrete. The presence of Na2SO4 helped reduce the creep strain of 50% slag concrete but slightly increased that of 70% slag-blended cement concrete. In addition, the applicability of the predictive model in AS3600:2018 for the creep behaviour of high slag content concrete was assessed.

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Hydration of Hybrid Cements at Low Temperatures: A Study on Portland Cement-Blast Furnace Slag—Na2SO4

Cited by 12 publications

References 63 publications

Phase Evolution of Hybrid Alkali Sulfate-Activated Ground-Granulated Blast Furnace Slag Cements

Phase Evolution of Hybrid Alkali Sulfate-Activated Ground-Granulated Blast Furnace Slag Cements

Effect of nanoparticles on the hydration of NaOH‐activated GGBFS

Creep of Slag Blended Cement Concrete with and Without Activator

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