RETRACTED ARTICLE: Prediction of aggregate modified index (AMI) using geomechanical properties of limestones

Khanlari, Gholamreza; Naseri, F.

doi:10.1007/s10064-016-0984-1

Cited by 6 publications

(2 citation statements)

References 24 publications

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“…After 500 rotations, the weight loss of aggregates thicker than the mesh size from the 1.7 mm sieve was about 1 g. It was shown that it is possible to predict each range of aggregate degradation. In turn, in References [57,58], coarse aggregate was analyzed to determine the compressive strength of concrete. It was shown that the higher the Los Angeles (LAA) value, the lower the compressive strength of the concrete.…”

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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Section: Literature Reviewmentioning

confidence: 99%

Influence of Natural Aggregate Crushing Process on Crushing Strength Index

et al. 2021

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“…As an aggregate material via extracted quarrying operations it is used in the construction of the roads, foundations, bridges and tunnel lining, and are essential for the development of modern economy (Galetakis et al 2012). In order to evaluate aggregate suitability for any construction application it is utmost necessary to perform a series of engineering tests, including speci c gravity (SG), water absorption test (WA), bulk density (BD), akiness index (FI), elongation index (EI), aggregate impact values (AIV), los angles abrasion value (LAAV), uniaxial compress strength (UCS), point load test (PLT), ultrasonic pulse velocity (UPV) and Schmidt hammer rebound test (SHRMT) (Khanlari and Naseri 2018).…”

Section: Introductionmentioning

confidence: 99%

Aggregate suitability and Geo-chemical investigation of limestone for construction industries in Pakistan: An approach for economic development

Kamran¹,

Ali²,

Ahmed³

et al. 2021

Preprint

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This study investigated the aggregate suitability and geo-chemical characteristics of limestone (LS) for construction industries. The results of aggregate parameters for different applications revealed that specific gravity (SG = 2.6), water absorption (WA = 0.47%), bulk density (BD = 1.58 g/cm3), flakiness index (FI = 16.8%), elongation index (EI = 16.39%), soundness (S = 1.6%), aggregate impact value (AIV = 14%), Los Angles Abrasion value (LAAV = 23.51%), clay lumps (CL = 0.35%), uniaxial compressive strength (UCS = 86.7 MPa), point load test (PLT = 5.18 MPa), ultrasonic pulse velocity (UPV = 5290 m/s) and Schmidt hammer rebound test (SHRT = 49 N) are in accordance with ASTM, ISRM and BSI. Petrographically, the LS is dominantly composed of ooids, peloids, bioclasts and calcite (CaCO3) with trace concentration of the dolomite. Geochemical results (n = 18) indicated that the LS is dominantly made up of calcite (95.81%); while on average it is composed of 52.08 wt.% CaO, 1.13 wt. % SiO2, 0.66 wt. %, MgO, 0.80 wt. % Al2O3, 0.76 wt. % Fe2O3 and LOI were recorded as 42.13 wt. %. Whereas, P2O5, TiO2, MnO, K2O and Na2O are found in trace amount. Regression analysis demonstrates that the empirical correlation equation for estimating uniaxial compressive strength with ultrasonic pulse velocity is more reliable than Schmidt hammer rebound test and point load test. The findings of this study strongly suggest LS of the area has a great potential as a raw material in construction industries.

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Strength and abrasive properties of andesite: relationships between strength parameters measured on cylindrical test specimens and micro-Deval values—a tool for durability assessment

Czinder

Török

2020

Bull Eng Geol Environ

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Aggregates are necessary materials for the construction industry. Owing to their favourable properties, andesites are frequently used rock materials; hence, the investigation of their mechanical and aggregate properties has great significance. This paper introduces the analyses of 13 Hungarian andesite lithotypes. The samples were collected from six andesite quarries in Hungary. Cylindrical specimens and aggregate samples with 10.0/14.0-mm-sized grains were made from rock blocks. The specimens were tested in dry, water-saturated and freeze–thaw subjected conditions. Bulk density, uniaxial compressive strength, modulus of elasticity, indirect tensile strength and water absorption were measured. The abrasion resistance was tested by micro-Deval tests. The flakiness indexes of the samples were also measured. The data set of the laboratory test results provided input for further, one- and two-variable statistical analyses. According to the test results, there is no significant difference between the strength parameters measured in water-saturated and in freeze–thaw subjected conditions. The correlation and regression analyses revealed relationships between some rock mechanical parameters, as well as between micro-Deval coefficient and uniaxial compressive strength.

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RETRACTED ARTICLE: Prediction of aggregate modified index (AMI) using geomechanical properties of limestones

Cited by 6 publications

References 24 publications

Influence of Natural Aggregate Crushing Process on Crushing Strength Index

Influence of Natural Aggregate Crushing Process on Crushing Strength Index

Aggregate suitability and Geo-chemical investigation of limestone for construction industries in Pakistan: An approach for economic development

Strength and abrasive properties of andesite: relationships between strength parameters measured on cylindrical test specimens and micro-Deval values—a tool for durability assessment

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