Influence of various sodium salt species on formation mechanism of lightweight aggregates made from coal fly ash-based material

Wei, Yu‐Ling; Cheng, Shao-Hsian; Chen, Wenjing; Lu, Yueh-Hua; Chen, Ken; Wu, Pei-Ching

doi:10.1016/j.conbuildmat.2019.117890

Cited by 31 publications

(6 citation statements)

References 31 publications

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“…In the literature, the effects of sodium salt-based admixtures on lightweight concrete have been investigated for different purposes. Wei et al [23] used various sodium salts in a fly ash/coal mixture to investigate the effect of sodium salt types on the formation mechanism of lightweight aggregates. Microanalysis results showed that despite the great similarity in melting point of salt additives, the change of additive from one sodium salt to another leads to significantly different light aggregate formation mechanism and thus affects aggregate properties.…”

Section: Discussionmentioning

confidence: 99%

Investigation of Engineering Properties of Lightweight Concrete Made With the Addition of Sodium Salt Based Powder Additive

Subaşı

Dehghanpour²,

KULA>

et al. 2022

Düzce Üniversitesi Bilim Ve Teknoloji Dergisi

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In the construction sector, which is needed for the rapidly increasing world population, the production of strong and safe buildings is given importance. This is achieved as a result of the functionality, durability and economical material production in construction materials. In order to reduce the dead load in buildings, the use of elements made of lightweight concrete is the most appropriate and alternative method. In the current study, lightweight concrete with 4 different mixtures was produced by using 0%, 0.5%, 1.5% and 2.5% powdered sodium salt-based styrene butadiene polymer admixtures (SBPA). The workability effect of the additive on the fresh mixtures was investigated by the flow table test. The 7 and 28 day compressive and flexural strengths of the obtained samples were tested. Density and porosity ratios of the samples were calculated before the 28-day compressive strength test. According to the results, it was observed that the additive material caused a slight decrease in workability. In addition, decreases were observed in mechanical strengths, but when compared with the literature, considering the decrease in density, it was understood that it is in the class of lightweight concreteswith suitable strength.

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Section: Discussionmentioning

confidence: 99%

Investigation of Engineering Properties of Lightweight Concrete Made With the Addition of Sodium Salt Based Powder Additive

Subaşı

Dehghanpour²,

KULA>

et al. 2022

Düzce Üniversitesi Bilim Ve Teknoloji Dergisi

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“…Therefore, fluxes and gas-forming agents are required for (1) generating gases, (2) reducing the firing temperature, and (3) adjusting the quantity and viscosity of the liquid phase for entrapping the generated gases. The fluxes of interest include waste glass [ 101 , 102 ], limestone [ 103 , 104 ], and synthetic chemicals such as sodium salts [ 105 , 106 ]. Some fluxes, including limestone and soda, also play the role of gas-forming agents.…”

Section: Firing-associated Recycling Of Fly Ashmentioning

confidence: 99%

Firing-Associated Recycling of Coal-Fired Power Plant Fly Ash

Minh

Pham

Tung

et al. 2023

Journal of Analytical Methods in Chemistry

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Coal-fired power plant fly ash is a global environmental concern due to its small particle size, heavy metal content, and increased emissions. Although widely used in concrete, geopolymer, and fly ash brick production, a large amount of fly ash remains in storage sites or is used in landfills due to inadequate raw material quality, resulting in a waste of a recoverable resource. Therefore, the ongoing need is to develop new methods for recycling fly ash. The present review differentiates the physiochemical properties of fly ash from two coal combustion processes: fluidized bed combustion and pulverized coal combustion. It then discusses applications that can consume fly ash without strict chemical requirements, focusing on firing-associated methods. Finally, the challenges and opportunities of fly ash recycling are discussed.

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“…Lightweight aggregate manufacture via cold bonding was developed in the early 2000s, and FA was used as the dry powder. In this process, a million tons of waste materials was employed to generate aggregate, and this was found to be an appropriate material for producing lightweight aggregates [22][23][24][25]. The cold-bonding process has been widely used to utilize various types of waste materials and protect the environment by controlling the leaching of pollutants [26].…”

Section: Introductionmentioning

confidence: 99%

Mechanical Properties of Concrete Produced by Light Cement-Based Aggregates

et al. 2022

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There is great growing concern regarding the environmental impact of the building and construction industry. Aggregate, one of the most crucial ingredients of concrete, is among the concerns in this regard. There will be a steady increase in demand for aggregates in the near future, but limited natural reserves will not be able to respond to this demand due to the risk of depletion. This current situation is forcing researchers to conduct new and artificial material production techniques that keep the resources within the allowed boundaries. Artificial aggregate production is one of the new methods for sustainable, environmentally friendly material production. The mechanical and environmental properties of lightweight concrete produced via artificial aggregates in different ratios were investigated in this study. Fly ash (FA), ground granulated blast-furnace slag (GGBFS), and quartz powder (QP) were utilized in the production of artificial lightweight aggregate (LWA) by using a special technique known as cold-bonding pelletization. The prepared concrete samples with the artificial aggregates were subjected to compressive, tensile, flexural, and bonding tests. The test results demonstrated that the bonding, tensile, and compressive strength values of lightweight concrete with a 20% GGBFS coarse aggregate replacement ratio of lightweight aggregates increased by 11%, 12%, and 30%, respectively. Moreover, it has been observed that a 41% increase in compressive strength is possible with a 40% QP coarse aggregate replacement ratio of lightweight aggregates. Finally, in addition to significantly impacting the mechanical properties of the lightweight concrete produced via artificial lightweight aggregates, we demonstrated that it is possible to control and reduce the harmful environmental effects of waste materials, such as FA, GGBFS, and QP in the present study.

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Influence of various sodium salt species on formation mechanism of lightweight aggregates made from coal fly ash-based material

Cited by 31 publications

References 31 publications

Investigation of Engineering Properties of Lightweight Concrete Made With the Addition of Sodium Salt Based Powder Additive

Investigation of Engineering Properties of Lightweight Concrete Made With the Addition of Sodium Salt Based Powder Additive

Firing-Associated Recycling of Coal-Fired Power Plant Fly Ash

Mechanical Properties of Concrete Produced by Light Cement-Based Aggregates

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