Phase characterizations, physical properties and strength of environment-friendly cold-bonded fly ash lightweight aggregates

Narattha, Chalermphan; Chaipanich, Arnon

doi:10.1016/j.jclepro.2017.09.259

Cited by 70 publications

(21 citation statements)

References 21 publications

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“…The addition of Ca(OH)2 to FA pellets can also produce pellets with good characteristics, although the samples formed were not as good in terms of pellet density, water absorption and crushing strength as samples made using cement. Further additions of Ca(OH)2 reduced the quality of the pellets formed (Narattha & Chaipanich, 2018).…”

Section: Cold-bonding Processingmentioning

confidence: 99%

“…Stabilization/solidification (S/S) has been widely used in the last few decades on many types of waste materials as a remediation solution, which allows pollutant containment and prevents leaching of hazardous compounds (Senneca et al, 2020). While the initial applications of S/S were focused on the production of a stabilized waste for environmentally safe disposal, it is now being used as a technology to allow the possible reuse of stabilized waste products as aggregates to be used in the construction industry (Colangelo, Cioffi, Montagnaro, & Santoro, 2012;Narattha & Chaipanich, 2018). An interesting application of this is the manufacture of artificial lightweight aggregates (LWA) (Ayati, Ferrándiz-Mas, Newport, & Cheeseman, 2018;Velis et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

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Cold-bonding process for treatment and reuse of waste materials: Technical designs and applications of pelletized products

Ferraro

Colangelo

Farina

et al. 2020

Critical Reviews in Environmental Science and Technology

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This work provides a comprehensive review of research on the cold-bonding pelletization process used to produce lightweight aggregates (LWAs) using waste materials, to valorise the waste and, at the same time, minimize risks related to disposal. Research investigating various aspects of the cold-bonding process highlight: i) feasible mix-designs for pellet production; ii) the most relevant operating parameters affecting the process; and iii) the potential applications of the LWAs produced. The analysis gives a wide overview of the fundamental key-points that control the cold-bonding process. Data comparison provides a useful way to identify the optimal process conditions to allow development of optimum products. This involves the selection of the correct mix-design, including suitable binders and potential additives, and the selection of appropriate operating conditions, which are a function of the waste investigated, and/or waste mix characteristics. The review proposes an optimised approach to experimental studies on cold-bonding processes that has potential to enhance future process performance. Moreover, the present work provides a complete framework useful for decision-making for both manufacturers and researchers working to use this promising technique.

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Section: Cold-bonding Processingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Cold-bonding process for treatment and reuse of waste materials: Technical designs and applications of pelletized products

Ferraro

Colangelo

Farina

et al. 2020

Critical Reviews in Environmental Science and Technology

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“…The fourth step is also an endothermic process, which mainly comes from the decomposition of some refractory carbonates, the redox reaction of iron oxides, and the decomposition process of refractory metal salts. As shown in Figure 1(b), the weight loss of fly ash can be divided into four single-step processes (Narattha and Chaipanich 2018;Quina et al 2014): water removal from fly ash; volatile matter in fly ash and exothermic combustion of fixed carbon; endothermic decomposition of calcium carbonate into calcium oxide; slow endothermic decomposition caused by the destruction of crystal lattices in materials.…”

Section: Resultsmentioning

confidence: 99%

Lightweight aggregate obtained from municipal solid waste incineration bottom ash sludge (MSWI-BAS) and its characteristics affected by single factor of sintering mechanism

Han

Cao

Wang

et al. 2020

Journal of the Air & Waste Management Association

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To solve the disposal problem of municipal solid waste incineration bottom ash sludge (MSWI-BAS), using it as the main raw material to prepare lightweight aggregates (LWA) for resource utilization.Sintering is an important process to achieve the desired microstructure and material properties. This paper investigates the characteristics of LWA affected by single factor of sintering mechanism (sintering temperature, heating rate and soaking time). Results show that sintering temperature increased from 1130°C to 1160°C caused high-density microstructure materials gradually formed in LWA, leading to particle strength increased from 0.1 MPa to 3.64 MPa, particle density showed an overall upward trend, reaching a maximum of 916 Kg/m 3 at 1160°C, and 1 h water absorption reduced from 68% to 25%. The heating rate of 15 K/min was beneficial to the formation of dense phase structure which could increase the particle strength, and the water absorption rate reached the lowest at this time, while the particle density was less affected by heating rate. When soaking time extended from 5 min to 20 min, particle strength and compressive density were gradually increased, and 1 h water absorption showed an overall downward trend, indicating that a longer soaking time was not conducive to the retention of pores. This study demonstrates that the utilization of MSWI-BAS to make high-performance LWA is feasible, along with the preferable environmental and economic benefits.Implications: MSWI-BAS were selected to produce lightweight aggregate (LWA), so that the sludge disposal problem is reduced. The effects of sintering temperature, heating rate and soaking time on the characteristics of LWA were investigated. Compact glass structures are formed at 1150°C and 1160°C which greatly improve the strength. The heating rate has little influence on the physical properties of LWA products. The particle density of LWA increases after the sintering soaking time reaches 15 minutes.

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“…The utilization of wastes in the production of LECA started in the 1990s [21]. Natural raw material was supplemented with waste glauconite [22], waste incineration bottom ash [23], fly ash [24], washings from a granite quarry [25], digested spent bentonite clay or basalt powder [26]. The tests have shown that also municipal sewage sludge containing 40-80% dry mass (d.m.)…”

Section: Introductionmentioning

confidence: 99%

The Influence of Sewage Sludge Content and Sintering Temperature on Selected Properties of Lightweight Expanded Clay Aggregate

2021

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Wastewater treatment processes produce sewage sludge (SS), which, in line with environmental sustainability principles, can be a valuable source of matter in the production of lightweight expanded clay aggregate (LECA). The literature on the influence of SS content and sintering temperature on the properties of LECA is scarce. This paper aims to statistically evaluate the effects of SS content and sintering temperature on LECA physical properties. Total porosity, pore volume, and apparent density were determined with the use of a density analyzer. A helium pycnometer was utilized to determine the specific density. Closed porosity was calculated. The test results demonstrated a statistically significant influence of the SS content on the specific density and water absorption of LECA. The sintering temperature had a significant effect on the specific density, apparent density, total porosity, closed porosity, total volume of pores, and water absorption. It was proved that a broad range of the SS content is admissible in the raw material mass for the production of LECA.

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Phase characterizations, physical properties and strength of environment-friendly cold-bonded fly ash lightweight aggregates

Cited by 70 publications

References 21 publications

Cold-bonding process for treatment and reuse of waste materials: Technical designs and applications of pelletized products

Cold-bonding process for treatment and reuse of waste materials: Technical designs and applications of pelletized products

Lightweight aggregate obtained from municipal solid waste incineration bottom ash sludge (MSWI-BAS) and its characteristics affected by single factor of sintering mechanism

The Influence of Sewage Sludge Content and Sintering Temperature on Selected Properties of Lightweight Expanded Clay Aggregate

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