Bloating Mechanism for Artificial Light Weight Aggregate of Surface Modification with Coal ash

Lee, Ki Gang

doi:10.4191/kcers.2015.52.2.159

Cited by 6 publications

(4 citation statements)

References 9 publications

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“…At a soaking temperature of 1180°C, the BI was 8% and the density was 1.38 g/㎤. At 1200°C, the BI was 18% and the density was 1.10 g/cm 3 . This satisfied EN 13055-1 the structural lightweight aggregate standard [28].…”

Section: Bloating Index and Single Aggregate Crushing Strengthmentioning

confidence: 98%

“…Aggregate materials are defined as natural or artificially produced stone or sand and are used as basic materials in construction work. Among these, artificial lightweight aggregates refers to an aggregate that is lightened in weight by sintering expanded shale, clay, slate, and/or coal fly ash [1][2][3]. Recently, the production of lightweight aggregates using various types of waste has been studied [4][5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

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Optimum conditions for unit processing of artificial lightweight aggregates using the Taguchi method

Wie

Lee

2019

Journal of Asian Ceramic Societies

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The purpose of this study was to investigate the unit processing parameters of a drying and preheating, calcination and sintering process for optimal bloating of artificial lightweight aggregates. Each process was divided into the room temperature ranges of up to 300°C, 300 to 600°C, 600 to 900°C, and 900 to 1200°C, with soaking at 1200°C. The times allotted for the drying and preheating (room temperature~600°C) and calcination processes (600~1200°C) were 10 to 40 minutes, and the time for the sintering process was 0 to 15 minutes. The experiment was designed according to the Taguchi method. The sintered samples were measured to determine the density and pore size. The processing time in the drying and preheating zone (room temperature~600°C) did not affect the bloating of the aggregates. The density of the aggregates decreased as the calcination time (900°C~1200°C) was shortened and the soaking time (1200°C) was lengthened. The soaking temperature and time had the greatest influence on the density of lightweight aggregates. The results predicted using the Taguchi method corresponded to the actual measurement results.

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Section: Bloating Index and Single Aggregate Crushing Strengthmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Optimum conditions for unit processing of artificial lightweight aggregates using the Taguchi method

Wie

Lee

2019

Journal of Asian Ceramic Societies

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“…Riley [14] and Kang and Kang [15] used a temperature elevation sintering method, and Lee [16,17] used rapid sintering. And the aggregate was sintered in the study of Lee [18] by the two-stage sintering method. A variety of calcining methods have been used, and the methodology for producing aggregates has not been well addressed.…”

Section: Introductionmentioning

confidence: 99%

Bloating Mechanism of Lightweight Aggregates due to Ramping Rate

Lee

Wie

et al. 2019

Advances in Materials Science and Engineering

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The purpose of this study was to improve the recycling rate of industrial wastes by investigating the bloating mechanism of artificial lightweight aggregate depending on the ramping rate and time, which is a dynamic parameter in the production of artificial lightweight aggregate. In this study, coal bottom ash and dredged soil at a weight ratio of 1 : 1 from a domestic power plant were used as raw materials. The artificial lightweight aggregates were formed by using an extruder and pelletizer (φ = 10 mm) and sintered by rapid sintering, 2-step firing, and normal sintering method. The physical properties of the aggregates such as bulk density, water absorption ratio, and microstructure of cross section are investigated with the sintering time and temperature. As the result of bloating and trapping mechanism, black core could be inhibited as the firing time increased at the temperature before surface formation. As a result of firing schedule graphs using least square method, it was possible to manufacture artificial lightweight aggregate with micropores, specific gravity of 1.1, and absorption rate of 3% at a heating rate of 27°c/min or less.

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“…One of the solution is the production of light weight aggregates as a filler within a concrete mix for application in the construction building industry. There are some reports showing manufacturing LWAs from the recycled masonry [1], sand sludge [2], fly ash [3,4] sewage sludge [5] or combination of various wastes with additional foaming agents [4,[6][7][8][9]. Because of a high silica content in glass, the composition of the initial mix must be corrected by additional components.…”

Section: Introductionmentioning

confidence: 99%

Manufacturing of Light Weight Aggregates from the Local Waste Materials for Application in the Building Concrete

Pawlik

Michalik

Sopicka-Lizer

et al. 2017

MSF

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The aim of those research was to find out the technique of the car windshield glass waste utilization. The research was performed in cooperation with the Polish small company, active in the waste utilization. Manufacturing of the light weight aggregates (LWAs) for application in the building concrete has been chosen as an appropriate solution. The local coal mine slates, the fine-grained coal mine wastes and fly ash from the local power station were tried for making the suitable mixture for granulation and sintering. All waste materials were characterized for their granulation, chemical composition and thermal behavior (DTA, TG/DTG, linear changes). Several mixtures with various composition were prepared, milled, homogenized and pelletized with water addition and finally sintered at 950°C. Thermally treated granules were tested for their density, porosity and mechanical properties. Some specimens were observed in scanning microscope. It has been shown that by variation of the composition of the waste materials it is possible to produce aggregates with a large variety of mechanical properties and porosities.

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Bloating Mechanism for Artificial Light Weight Aggregate of Surface Modification with Coal ash

Cited by 6 publications

References 9 publications

Optimum conditions for unit processing of artificial lightweight aggregates using the Taguchi method

Optimum conditions for unit processing of artificial lightweight aggregates using the Taguchi method

Bloating Mechanism of Lightweight Aggregates due to Ramping Rate

Manufacturing of Light Weight Aggregates from the Local Waste Materials for Application in the Building Concrete

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