Shrinkage mechanisms of alkali-activated slag

Ye, Hailong; Radlińska, Aleksandra

doi:10.1016/j.cemconres.2016.07.001

Cited by 331 publications

(118 citation statements)

References 43 publications

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“…Compared with OPC, the hydration product of AAS was C-S-H with a low H/S (H 2 O/Si) [24], which means the hydration of AAS requires less water. Furthermore, the adsorbed, interlayer, and capillary water in AAS paste [25] was observed, which can support the continuation of hydration. However, we used a w/c ratio of 0.5 to ensure the fluidity for casting.…”

Section: Compressive Strength and Elastic Modulusmentioning

confidence: 58%

Effect of Stress–Strength Ratio on Creep Property of Sodium Silicate–Based Alkali-Activated Slag Concrete

et al. 2019

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Alkali-activated materials have attracted increasing interest owing to their excellent properties and environmental protection. However, there have been few studies on their creep properties. The aim of this article is to investigate the effect of the stress–strength ratio on the creep property of sodium silicate–based alkali-activated slag (AAS) concrete. For this reason, five groups of AAS concrete with different stress–strength ratios (0.15, 0.3, 0.45, 0.6, and 0.75) were tested. The results indicate that the creep of AAS concrete has a convergent nonlinear stage and a non-convergent stage but not an obvious linear stage. The AAS concrete basically has a consistent creep coefficient and diverse specific creep under a stress–strength ratio of 0.15–0.6. The elasticity modulus of AAS is much smaller than that of ordinary Portland cement (OPC) concrete, which is the reason for the greater creep compared to that in OPC concrete, and the inaccuracy of the model prediction. By applying the actual elastic modulus, the models can predict the specific creep and stress-dependent strain of AAS concrete with a 0.3 stress–strength ratio, except for the B3 model. The secant modulus of AAS concrete decreases linearly with an increase in the stress–strength ratio. Finally, we propose an improved creep model for AAS concrete with a wide stress–strength ratio based on the GL2000 model.

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Section: Compressive Strength and Elastic Modulusmentioning

confidence: 58%

Effect of Stress–Strength Ratio on Creep Property of Sodium Silicate–Based Alkali-Activated Slag Concrete

et al. 2019

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“…increased shrinkage magnitude but reduced shrinkage kinetics) of alkaliactivated slag (AAS) to the alkali incorporation in the main hydrated product, i.e. calcium-alumina-silicatehydrate (C-A-S-H) (Ye and Radlińska 2016c;Ye et al 2017a).…”

Section: Introductionmentioning

confidence: 99%

Effect of Alkalis on Cementitious Materials:Understanding the Relationship between Composition, Structure, and Volume Change Mechanism

Radlińska

2017

ACT

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Journal of Advanced AbstractPrevious studies demonstrated that alkalis can considerably affect the volumetric properties of hardened cementitious binders, including shrinkage, creep, and micro-cracking. The objective of this paper is to reexamine the effect of alkalis on the composition, nanostructure, phase stability, and morphology of calcium-silicate-hydrate (C-S-H) in cementitious materials, and to further propose a conceptual model bridging the C-S-H characters with its volume change mechanisms in alkali-enriched systems. The proposed microstructural model is an extension of the colloidal model of C-S-H considering the effect of alkalis. It is suggested that the presence of alkalis makes C-S-H more thermodynamically unstable and structurally disrupted, and easier to reorganize and redistribute upon drying-induced internal stresses or external loading. In addition, new experimental results regarding the influence of lithium on shrinkage and micro-cracking of alkali-activated blast-furnace slag are discussed. It shows that lithium addition can dramatically improve the cracking resistance and volumetric stability of alkali-activated slag.

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“…This is because drying shrinkage takes place due to moisture loss. Thus, the drying shrinkage increases with increasing moisture loss (Ye and Radlińska, 2016). The firing shrinkage percentages of sintered products increase with increasing sintering temperature for the same ratio of raw materials (Table 2).…”

Section: The Physical Properties Of Wetted Materials and Sintered Promentioning

confidence: 90%

Water Filter Fabrication from a Mixture of KMnO<sub>4</sub> Modified Kapok Carbon Fiber, Zeolite, Bentonite and Clay for Fe<sup>3+</sup>Removal and Water Hardness Treatment

Thongdee¹,

Parun²,

Benjatitmongkhon³

et al. 2017

American Journal of Applied Sciences

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A water filter was fabricated from a mixture of KMnO 4 modified kapok carbon fiber, zeolite, bentonite and kaolinite clay for Fe 3+ removal and water hardness treatment. The effects of amount of KMnO 4 modified kapok carbon fiber (30-60 wt%), zeolite (20-40 wt%) and sintering temperature (500-700°C) on the properties of sintered products were evaluated. The best of sintered products were tested for treatment of solutions with 5 mg L −1 Fe 3+ and 40-200 mg L −1 total water hardness. The results show that the physical properties of the sintered products were affected by the contents of KMnO 4 modified kapok carbon fiber and sintering temperature. The linear drying shrinkages of the mixture of raw materials increase with increasing content of modified kapok carbon fiber amounts due to the effect of water amount used for mixing process. Furthermore, firing shrinkages of sintered products increased with increasing sintering temperature for the same ratio of raw materials. Finally, the firing shrinkages and density of sintered products decrease with increasing content of the modified kapok carbon fiber at constant sintering temperature. It was shown that the sintered product made with 40 wt% of KMnO 4 modified kapok carbon fiber and sintered at 600°C is suitable for filter fabrication. The KMnO 4 modified kapok carbon fiber filter could adsorb 5-6% more Fe 3+ at equilibrium than filter made with kapok carbon fiber. The Fe 3+ was removed by adsorption and precipitation processes. The Fe 3+ adsorption process of modified kapok carbon fiber filter was fitted to the Langmuir model with maximum adsorption capacity of 53.76 mg g −1 . For hardness removal, the Ca for Mg 2+ and 28.1-123.5 mg g −1 for HCO 3¯, respectively.

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Shrinkage mechanisms of alkali-activated slag

Cited by 331 publications

References 43 publications

Effect of Stress–Strength Ratio on Creep Property of Sodium Silicate–Based Alkali-Activated Slag Concrete

Effect of Stress–Strength Ratio on Creep Property of Sodium Silicate–Based Alkali-Activated Slag Concrete

Effect of Alkalis on Cementitious Materials:Understanding the Relationship between Composition, Structure, and Volume Change Mechanism

Water Filter Fabrication from a Mixture of KMnO<sub>4</sub> Modified Kapok Carbon Fiber, Zeolite, Bentonite and Clay for Fe<sup>3+</sup>Removal and Water Hardness Treatment

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