MSWI Fly Ash Multiple Washing: Kinetics of Dissolution in Water, as Function of Time, Temperature and Dilution

Caviglia, Caterina; Destefanis, Enrico; Pastero, Linda; Bernasconi, Davide; Bonadiman, Costanza; Pavese, Alessandro

doi:10.3390/min12060742

Cited by 7 publications

(3 citation statements)

References 48 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…At the age of 90 days, the portlandite and ettringite, which are characteristic of early cement hydration, were not remarked [77]. Figure 5b shows the evolution of the degree of crystallinity for the investigated samples up to the age of 90 days and those previously reported at 28 days [69], the difference up to 100% representing the amorphous fraction [78]. Figure 5B shows the evolution of the degree of crystallinity for the investigated samples up to the age of 90 days and those previously reported at 28 days [69], the difference up to 100% representing the amorphous fraction [78].…”

Section: X-ray Diffractionmentioning

confidence: 64%

Potential Role of GGBS and ACBFS Blast Furnace Slag at 90 Days for Application in Rigid Concrete Pavements

Nicula,

Manea,

Simedru

et al. 2023

Materials

View full text Add to dashboard Cite

Incorporating blast furnace slag into the composition of paving concrete can be one of the cost-effective ways to completely eliminate by-products from the pig iron production process (approximately 70% granulated slag and 30% air-cooled slag). The possibility to reintroduce blast furnace slag back into the life cycle will provide significant support to current environmental concerns and the clearance of tailings landfills. Especially in recent years, granulated and ground blast furnace slag (GGBS) as a substitute for cement and air-cooled blast furnace slag (ACBFS) aggregates as a substitute for natural aggregates in the composition of concretes have been studied by many researchers. But concrete compositions with large amounts of incorporated blast furnace slag affect the mechanical and durability properties through the interaction between the slag, cement and water depending on the curing times. This study focuses on identifying the optimal proportions of GGBS as a supplementary cementitious material (SCM) and ACBFS aggregates as a substitute to natural sand such that the performance at 90 days of curing the concrete is similar to that of the control concrete. In addition, to minimize the costs associated with grinding GGBS, the hydration activity index (HAI) of the GGBS, the surface morphology, and the mineral components were analyzed via X-ray diffraction, scanning electron microscopy (SEM), energy dispersive spectrometry (EDX), and nuclear magnetic resonance relaxometry (NMR). The flexural strength, the basic mechanical property of road concretes, increased from 28 to 90 days by 20.72% and 20.26% for the slag concrete but by 18.58% for the reference concrete. The composite with 15% GGBS and 25% ACBFS achieved results similar to the reference concrete at 90 days; therefore, they are considered optimal percentages to replace cement and natural sand in ecological pavement concretes. The HAI of the slag powder with a specific surface area equivalent to that of Portland cement fell into strength class 80 at the age of 28 days, but at the age of 90 days, the strength class was 100. The results of this research present three important benefits: the first is the protection of the environment through the recycling of two steel industry wastes that complies with European circular economy regulations, and the second is linked to the consequent savings in the disposal costs associated with wastefully occupied warehouses and the savings in slag grinding.

show abstract

Section: X-ray Diffractionmentioning

confidence: 64%

Potential Role of GGBS and ACBFS Blast Furnace Slag at 90 Days for Application in Rigid Concrete Pavements

Nicula,

Manea,

Simedru

et al. 2023

Materials

View full text Add to dashboard Cite

show abstract

“…After 1 day of leaching, the concentration of heavy metals in the leaching solution showed a slow decreasing trend as the replacement time of the leachant became regular. This phenomenon was mainly attributed to the fact that the leaching of lead ions in S/S monoliths is mainly controlled by diffusion [9,28]. The concentration of lead ions in the S/S monolith was relatively high, and the diffusion and migration rate was high during the early stages of the experiment.…”

Section: Effect Of Temperature On Lead Ion Leachingmentioning

confidence: 99%

“…Separations 2022, 9, x FOR PEER REVIEW concentration of heavy metals in the leaching solution showed a slow decreasing tr the replacement time of the leachant became regular. This phenomenon was mai tributed to the fact that the leaching of lead ions in S/S monoliths is mainly control diffusion [9,28]. The concentration of lead ions in the S/S monolith was relatively and the diffusion and migration rate was high during the early stages of the exper Though the concentration in the leachate fluctuated with time, the concentration a lease rate of lead ions in the leaching solution decreased with leaching time.…”

Section: Effect Of Temperature On Lead Ion Leachingmentioning

confidence: 99%

Effects of Temperature on the Leaching Behavior of Pb from Cement Stabilization/Solidification-Treated Contaminated Soil

et al. 2022

View full text Add to dashboard Cite

Solidification/stabilization (S/S) is one of the most widely used techniques in the disposal of heavy-metal-contaminated soil, though the long-term effectiveness of S/S technology remains implicit. Temperature is an important factor affecting the leaching behavior of heavy metals and the long-term effectiveness of S/S treatment. This study systematically explored the influence of temperature on the leaching behavior of lead in an S/S monolith through semi-dynamic leaching test at different temperatures. The results showed that an increase in temperature could accelerate the leaching concentration and cumulative leaching amount of lead ions in the S/S monolith. The cumulative leaching amount of lead ions in the S/S monolith after 11 days at 55 °C was about 5.8 times that at 25 °C. The leaching rate of lead ions in the S/S monolith increased with the increase in temperature. The leaching index of lead ions was larger than 9, which met the requirements for “controlled utilization” in the environment. The leaching mechanism of lead ions was diffusion control and did not change in the temperature range of 25–55 °C. These findings indicate that temperature affects the leaching behavior and the long-term effectiveness of S/S treatment, and temperature variation should be considered in the effectiveness evaluation of S/S treatment.

show abstract

Cement-based immobilization of combustion/incineration residues

Guo,

Qin,

Tian

et al. 2024

Treatment and Utilization of Combustion and Incineration Residues

View full text Add to dashboard Cite

MSWI Fly Ash Multiple Washing: Kinetics of Dissolution in Water, as Function of Time, Temperature and Dilution

Cited by 7 publications

References 48 publications

Potential Role of GGBS and ACBFS Blast Furnace Slag at 90 Days for Application in Rigid Concrete Pavements

Potential Role of GGBS and ACBFS Blast Furnace Slag at 90 Days for Application in Rigid Concrete Pavements

Effects of Temperature on the Leaching Behavior of Pb from Cement Stabilization/Solidification-Treated Contaminated Soil

Cement-based immobilization of combustion/incineration residues

Contact Info

Product

Resources

About