Impact of Geometric and Petrographic Characteristics on the Variability of LA Test Values for Railway Ballast

Hofer, Vera; Bach, Holger; Latal, Christine; Neubauer, Anna Christina

doi:10.1007/s11004-013-9472-3

Cited by 16 publications

(9 citation statements)

References 8 publications

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“…Hofer et al [ 33 ] emphasize that mineral composition has a significant influence on the results of fragmentation resistance tests. Additionally, Åkesson et al [ 81 , 82 ] indicate that the size, shape, and spatial arrangement of grains are important parameters influencing the mechanical properties of rocks.…”

Section: Wear and Fragmentation Resistance Of Mineral Aggregates—a Review Of Micro-deval And Los Angeles Testsmentioning

confidence: 99%

“…A review of the analyses or modifications of research methods using the micro-Deval apparatus and the Los Angeles mill, which serve to identify resistances to wear (the M DE/DS method) and to fragmentation (the LA method), respectively, indicates that the test methodologies vary significantly [4,29,30]. The review also points to the analyses of the influence of crushing processes on various aggregate properties, including strength parameters [31][32][33][34][35][36][37][38]. The review results also suggest that the mineral composition, structure, and size of mineral components definitely have a significant influence on the resistance to wear and fragmentation.…”

Section: Wear and Fragmentation Resistance Of Mineral Aggregates-a Review Of Micro-deval And Los Angeles Testsmentioning

confidence: 99%

“…Therefore, an improper production process can contribute to the destruction of the rock material and-as a result-to the lowering of its wear and fragmentation resistance. In addition, Rajan and Singh [36,37], Gawenda [32,74], Hofer et al [33], Fernlund [31], and Räisänen and Mertamo [38] demonstrated that the type of the crushers and the variability of the crushing stages have an impact on the geometric parameters of mineral aggregates, significantly influencing the results of wear and fragmentation resistance.…”

Section: Influence Of Crushing Processes On the Resistance To Wear And Fragmentationmentioning

confidence: 99%

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Wear and Fragmentation Resistance of Mineral Aggregates—A Review of Micro-Deval and Los Angeles Tests

Strzałkowski

Kaźmierczak

2021

Materials

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The aim of this article is to present the current knowledge and experiences related to wear and fragmentation resistance tests and to indicate those of their aspects that require further research. For this purpose, a review of the literature was performed. Results show that tests of resistance to wear (the MDE/DS test) and fragmentation (the LA test) are performed worldwide according to different standards (and thus following different test methods), which prevents a comparison of the obtained results. Comparative research into the MDE/DS and LA tests indicates that the MDE/DS test is more effective. The disadvantage of both tests lies in the dimension range of the aggregate. In addition, the use of steel balls in the LA test may not reflect the actual influence that the internal properties of the material have on the fragmentation process. A final review of the available knowledge allowed the formulation of proposals regarding further research directions, such as proposed changes of test methods, extensive analysis, and selection of optimal dimensions for tested aggregates, analysis of short-term and long-term tests, as well as extensive research into and an analysis of the impact of crushing on the physical, mechanical, and geometric properties of aggregates.

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Section: Wear and Fragmentation Resistance Of Mineral Aggregates—a Review Of Micro-deval And Los Angeles Testsmentioning

confidence: 99%

Section: Wear and Fragmentation Resistance Of Mineral Aggregates-a Review Of Micro-deval And Los Angeles Testsmentioning

confidence: 99%

Section: Influence Of Crushing Processes On the Resistance To Wear And Fragmentationmentioning

confidence: 99%

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Wear and Fragmentation Resistance of Mineral Aggregates—A Review of Micro-Deval and Los Angeles Tests

Strzałkowski

Kaźmierczak

2021

Materials

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“…However, numerical studies (Tutumluer, Huang, Hashash, & Ghaboussi, 2006;Lu & McDowell, 2007) clearly prove that particle shape has an effect on the generation of load chains within the ballast layer and thus on both settlement rates and load level. Hofer, Bach, Latal, and Neubauer (2013) investigated the impact of geometric and spectroscopic characteristics on the variability of the LA test value for railway ballast. They showed that the deviation of the petrographic composition within a given sample had a considerable impact on the LA test results, whereas the influence of the respective deviation of particle geometry was relatively small.…”

Section: Related Workmentioning

confidence: 99%

Statistical monitoring for continual quality control of railway ballast

Hofer

Bach²

2015

Expert Systems with Applications

Self Cite

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“…This crucial aggregate property has been investigated from many aspects. For instance, Räisänen and Mertamo [ 23 ], Hofer et al [ 24 ], Gawenda [ 2 , 25 ], Rajan and Singh [ 26 , 27 ], Köken [ 28 ], Köken and Lawal [ 29 ], Strzałkowski et al [ 15 ] and Gawenda et al [ 30 , 31 ] indicated that the shape properties of rock aggregates are dependent upon the rock manufacturing processes. In other words, different rock crushers have different impacts on rock aggregate flakiness, which ultimately affects the mechanical parameters.…”

Section: Introductionmentioning

confidence: 99%

Influence of Basalt Aggregate Crushing Technology on Its Geometrical Properties—Preliminary Studies

et al. 2023

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The use of mineral aggregates is related to the increasing demand in construction, railway and road infrastructures. However, mineral aggregates can appear to be of variable quality, directly affecting their suitability for respective earthwork applications. Since the production of mineral aggregates should ensure the standardized, high-quality requirements of the final product, rock-crushing mechanisms should be investigated in a detailed manner. In this context, the aim of the present study is to evaluate and analyze the geometric parameters of basalt aggregates as a result of several rock comminution processes. Basalt aggregates from two deposits in Poland were used in the study. The samples are differentiated regarding both lithological variances, mineral composition as well as the host rock’s tuff content. The rock comminution processes were conducted using two types of crushers, namely the laboratory-scale jaw and cone crushers. The feed for crushing was designed based on the original geometric grain composition and the separated feed in the form of flaky and non-flaky particles. The crushability test results demonstrated that the interparticle compression in the jaw crusher resulted in finer products compared to the one in the cone crusher. It was also observed that the flakiness and shape indexes decreased after crushing, both in the feed with the original geometric composition of the grains and those with flaky and non-flaky particles. Nevertheless, a higher flakiness index was obtained after the crushing of non-flaky particles and a lower one after the crushing of flaky particles. The flakiness index for grains below 16 mm after the crushing process was less than 10%, which indicates a more favorable result compared to the original feed. In addition, it was shown that flaky and non-cubical particles were accumulated in the finest (below 8 mm) and coarsest (above 20 mm) fractions in jaw and cone crushing processes, receiving flakiness and shape indexes ranging up to 80–100%. Finally, it was also observed that the lithological variances of the feed material have a significant impact on the particle size distribution of the product. More profoundly, basalt aggregates with a higher tuff content and weathering degree have a higher degree of crushing. The present study, in this context, provides accurate and satisfying information on understanding the crushing mechanisms of two important crushing equipment as well as their rock-crusher interactions.

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Impact of Geometric and Petrographic Characteristics on the Variability of LA Test Values for Railway Ballast

Cited by 16 publications

References 8 publications

Wear and Fragmentation Resistance of Mineral Aggregates—A Review of Micro-Deval and Los Angeles Tests

Wear and Fragmentation Resistance of Mineral Aggregates—A Review of Micro-Deval and Los Angeles Tests

Statistical monitoring for continual quality control of railway ballast

Influence of Basalt Aggregate Crushing Technology on Its Geometrical Properties—Preliminary Studies

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