Evaluation of Some Stone Dust and Sludge Generated in the Aggregate Production Process and Research Trends for Its Use

Lee, Jin Young; Cheong, Young‐Wook; Ji, Sangwoo; Lee, Dong-Gil

doi:10.9719/eeg.2021.54.5.605

Cited by 3 publications

(1 citation statement)

References 15 publications

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“…The results revealed that stone sludge was applied as a concrete filler to general-strength high-flowing concrete, and an expected reduction of approximately 10% in cement usage was reported. The majority of studies using stone sludge have been conducted to investigate the change in mechanical characteristics of concrete resulting from mixing and replacement of materials; and none of the cases used only stone sludge in place of cement, aggregate, and development materials for road excavation [ 10 , 12 ].…”

Section: Introductionmentioning

confidence: 99%

Microstructure Analysis and Mechanical Properties of Backfill Material Using Stone Sludge

Lee

Baek

2023

Materials

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In this study, the optimum mixing ratio for backfill was determined by analyzing the mechanical properties and microstructure of controlled low-strength material (CLSM)―the backfill material for road excavation and restoration―using the total amount of stone sludge generated during aggregate production, including analysis of the flow and material separation resistance by compounding factors. A small-scale field evaluation was conducted using the derived optimal mixing ratio. A comprehensive analysis of the mechanical properties was based on the relevant standards and specifications, and a microstructure analysis indicated that the optimal mixing ratio of CLSM containing stone sludge was 350% W/B. A field applicability evaluation indicated that the flow was 230 mm, and the initial and re-excavation properties were 0.75 and 1.15 MPa, respectively, which met ASTM standards. Monitoring for approximately 5 months revealed that there was no ground subsidence caused by traffic, and it was confirmed that re-excavation with equipment was possible. After re-excavation, the filling properties of CLSM using stone sludge and the pipe periphery were checked, and it was found that no significant filling and pipe damage had occurred.

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Section: Introductionmentioning

confidence: 99%

Microstructure Analysis and Mechanical Properties of Backfill Material Using Stone Sludge

Lee

Baek

2023

Materials

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Physical Properties of Major Bedrocks in Chungju-Goesan Area as Aggregates

You

2022

Econ. Environ. Geol.

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This study examined the granite, quartzite, phyllite, schist, and gneiss as aggregate resources among the original rock distributed in the Chungju-Goesan area. The granite distributed in the study area is mainly composed of Jurassic biotite granite, and the quartzite layer is from the Daehyangsan quartzite Formation distributed on the upper part of the Gyemyeongsan Formation and the Hyangsan-ri dolomitic limestone Formation. In addition, phyllite is pophyrytic phyllite-schist from the Hwanggangri Formation of the Okcheon group, schist is chlorite schist, from the Munjuri Formation of the Okcheon group, and gneiss is porphyroblastic gneiss which is the upper part of the Seochangri Formation. Aggregate quality evaluation factors of these rocks included fineness modulus, absorption, unit weight, absolute dry density, solid content, porosity, resistance to abrasion, and soundness. In the case of granite, it was found to be partially unsatisfactory in terms of unit weight, solid content, porosity, and resistance to abrasion. Gneiss was found to be out of the standard values in resistance to abrasion and schist in porosity and solid content. As for the overall quality of aggregate resources, it was analyzed that quartzite, gneiss, and phyllite showed excellent quality. Aggregate quality tests are performed simply for each rock, but the rock may vary depending on the morphology of the mineral. Therefore, when analyzing and utilizing the quality evaluation of aggregate resources, it will be possible to use them more efficiently if the rock-mineralological research is performed together.

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Evaluation of Changes in Particle Size and Production of Sand and Cake Produced in Wet Aggregate Production Process

Cheong,

Lee,

Hong

2024

Econ. Environ. Geol.

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This study was conducted to find a way to reduce the production of cakes generated in the domestic aggregate production process. Cakes from 8 wet aggregate producers were collected and particle size was analyzed. Samples were collected step by step from an aggregate producer A, particle size analysis was performed, and the material balance was calculated before and after an sand recovery unit by modeling the production process. As a result of the particle size analysis of eight cakes, one sample contained 50% sand, and the rest contained about 5% to 25% sand. The results showing that the cake contained a variety of sand in cakes may indicate that the recovery efficiency of the sand recovery units in the field varied. Sieve analysis of the samples showed that the generation of sand particles increased 2.8 times during the third crushing compared to the second crushing, and more cake particles were generated. As a result of simulating the sand recovery unit model, the lower the cut point of the cyclone and dewatering screen, the higher the sand production and the less cake production appeared. In order to reduce the production of cake in the field, it was determined that an optimal operation of the sand recovery unit was necessary in the aggregate production process.

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Evaluation of Some Stone Dust and Sludge Generated in the Aggregate Production Process and Research Trends for Its Use

Cited by 3 publications

References 15 publications

Microstructure Analysis and Mechanical Properties of Backfill Material Using Stone Sludge

Microstructure Analysis and Mechanical Properties of Backfill Material Using Stone Sludge

Physical Properties of Major Bedrocks in Chungju-Goesan Area as Aggregates

Evaluation of Changes in Particle Size and Production of Sand and Cake Produced in Wet Aggregate Production Process

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