Statistical analysis of mechanical properties on the example of aggregates of Carpathian sandstones

Hydzik-Wiśniewska, Joanna; Bednarek, Łukasz

doi:10.2478/sgem-2020-0003

Cited by 4 publications

(7 citation statements)

References 18 publications

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“…A similar impact of penetration curve adjustments on CBR results was found for mixtures with the grading of 0-63 mm (Figs. [16][17][18][19]. The adjustment of the concave portion of the curve resulted in an increase in CBR.…”

Section: Test Resultsmentioning

confidence: 99%

An assessment of how penetration curve adjustment affects the California bearing ratio (CBR)

Bednarek

2021

Studia Geotechnica Et Mechanica

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With the rapidly developing road transport, there is a demand for new roads to be constructed and for the existing ones to be repaired or extended. The base of any road is its foundation, usually made of crushed or uncrushed aggregate. To be used for road foundation purposes, a material needs to meet many requirements, as imposed by relevant standards. One of the basic tests to assess the suitability of an aggregate is to determine its California bearing ratio (CBR). This paper presents the results of CBR tests for mixed aggregate with the grading of 0–31.5 and 0–63 mm. Detailed assessments were carried out for penetration curves, which in many cases need to be adjusted to meet industry standards. The adjustment of plunger penetration curves in aggregate samples causes CBR to increase compared to the original curves.

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Section: Test Resultsmentioning

confidence: 99%

An assessment of how penetration curve adjustment affects the California bearing ratio (CBR)

Bednarek

2021

Studia Geotechnica Et Mechanica

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“…research into aggregate wear and fragmentation resistance tests address issues of mutual relationships and correlations between aggregate properties [3,11,14,[39][40][41][42][43][44][45][46][47][48][49][50][51][52].…”

Section: Analysis and Modifications Of Test Methodsmentioning

confidence: 99%

“…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. Interestingly, the majority of publications related to research into aggregate wear and fragmentation resistance tests address issues of mutual relationships and correlations between aggregate properties [ 3 , 11 , 14 , 39 , 40 , 41 , 42 , 43 , 44 , 45 , 46 , 47 , 48 , 49 , 50 , 51 , 52 ].…”

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

confidence: 99%

“…Czinder and Török [ 3 ], Capik and Yilmaz [ 41 ], Hydzik-Wiśniewska and Bednarek [ 46 ], Török and Czinder [ 50 ], Tuncay et al [ 51 ], Ugur et al [ 52 ], and Török [ 86 ] conducted their research on aggregates from various sources. Based on the obtained results, they demonstrated a strong correlation between the resistance to fragmentation and the resistance to wear, as well as between the resistance to fragmentation or wear and the resistance to compression.…”

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

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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“…These studies have shown that if we have one of these values determined by the test, it is possible to estimate another two related values based on the known correlations. The next example is article [53], in which dependence between the mechanical and geometric properties of aggregates was verified, i.e., aggregate (arches and mixtures) produced from sands of layers of Magura or Cergo. An analysis was carried out for dependence between the Los Angeles index, Micro-Deval index, and flatness and shape indicators.…”

Section: Literature Reviewmentioning

confidence: 99%

Influence of Natural Aggregate Crushing Process on Crushing Strength Index

et al. 2021

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Crushing is one of the most energy-consuming technological processes. The purpose of grinding is to achieve the desired grain size of mineral raw materials. The process of grinding consists of many factors, for example, the size and form of crushed grains, as well as their mutual arrangement inside the crushing machine chamber, the technological parameters of the crusher, the material properties, and the speed of the moving grains. One of the key parameters of the aggregate is its resistance to grinding. Resistance to grinding is related to the strength of the products made from aggregates subjected to grinding, which affects the overall quality of these products. Therefore, the aim of this study is to analyze the impact of the crushing of natural aggregate on the LA crumbling strength index. Two types of aggregates were analyzed—natural gravel and natural pebbles crushed in a crusher. Aggregates were acquired from two mines belonging to the plant Kruszgeo S.A. in Rzeszów, i.e., ZEK (Zakład Eksploatacji Kruszywa) Ostrów and ZEK Strzegocice II. The aggregate crushing process was carried out for 4–8 mm and 10–14 mm fractions using cone crushers of the 1044 type. Aggregate crushing was carried out in a Los Angeles drum, in accordance with the requirements of EN 1097-2:2020. The analysis showed that for grits of the 10–14 mm fraction, the lower values of the LA indices were obtained, which allows for obtaining a bigger index of crushing strength than in the case of crushing using the 4–8 mm fraction. This analysis showed how important the process of grinding aggregates is and, thus, the appropriate selection of fractions for the grit crushing process for the aggregate strength on grinding. Subjecting the aggregate to the grinding process results in an improvement in the crushing strength indicator, thus obtaining better strength parameters of the products manufactured from the aggregates subjected to the process of crushing (for example, concrete). The originality of the study is an analysis of key Polish aggregates and the crushing strength index.

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Statistical analysis of mechanical properties on the example of aggregates of Carpathian sandstones

Cited by 4 publications

References 18 publications

An assessment of how penetration curve adjustment affects the California bearing ratio (CBR)

An assessment of how penetration curve adjustment affects the California bearing ratio (CBR)

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

Influence of Natural Aggregate Crushing Process on Crushing Strength Index

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