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The crushability of twenty-four different rock types were determined and correlated with the corresponding results from the impact strength test. It was found …
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To conduct crushing strength test we need compression testing machine, cylindrical measure, plunger and Isa sieves. ... Impact value of aggregate will give aggregate capability against sudden loads or forces. For this …
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In the present paper, we deduce an analytical formula for the dynamic crushing strength in terms of the impact velocity and the thickness ratio for hexagonal …
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The impact crushing strength of ice can be defined via the specific impact crushing energy which is the impact crushing energy related to the volume of the crushed ice. This definition is used in conjunction with a mathematical model of ice/rigid body impact to describe ice impact crushing strength and various impact characteristics introduced ...
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The level of initial imperfection has a particularly large impact on the ultimate crushing strength, but it has a relatively smaller effect on the mean crushing load. However, precise management, related to the initial imperfection, is required for accurate crushing performance estimation. The initial imperfection of the residual …
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The determination of crushing strength for particles with complex shapes was discussed, and it was found that it is appropriate to use the area equivalent circle diameter to obtain the crushing ...
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One-Stage Composite Impact Crushing Pretreatment Process. As the strength of C&D waste is relatively low, the impact crusher can basically meet the demand for coarse …
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Detailed deformation modes along two orthogonal directions are examined, where a parametric study of the effect of impact velocity and cell wall aspect ratio is performed. An analytical formula of the dynamic crushing strength is then deduced based on the periodic collapse mechanism of cell structures. Comparisons with the finite …
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As a brittle material, coral sand particles are characterized by their irregular shape, complex internal structure, and high strength variability. This study used the Weibull statistical method to analyze the crushing strength of single coral sand particle. In this study, the diametral compression test was conducted on 200 coral sand particles that …
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Concept and significance of the Aggregate crushing value test. The ' aggregate crushing value test ` gives a relative measure of the resistance of an aggregate to crushing under a gradually applied compressive load. Aggregate crushing value is defined as the percentage by weight of the crushed (or finer) material obtained when the …
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Aggregate crushing value is a numerical index of the strength of the aggregate and it is used in construction of roads and pavements. Crushing value of aggregates indicates its strength. Lower crushing value is recommended for roads and pavements as it indicates a lower crushed fraction under load and would give a longer service life and a more ...
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The fractal theory can effectively describe the complexity and multi-scale of concrete under impact load and provide a scientific basis for evaluating concrete's impact resistance. Therefore, based on the fractal theory, this study carried out the fragmentation size analysis by weighing the quality of SFRRAC fragments, disclosed the distribution …
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The upper and the lower limit of the two plateau stresses are formulated based on the theory of plastic dissipation under low-velocity impact. The high-velocity crushing strength is given based on the conservation of momentum. Both the theoretical low-velocity and high-velocity crushing strengths are coincident with the finite element …
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The coal's particle size distribution properties after pulverization and the gas desorption behavior driven by pulverization are of profound meaning to the study of coal and gas outburst mechanism. In this paper, based on the impact crushing experiment, the tectonic coal and primary coal are crushed under different impact energy conditions. After …
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The suitability of the 4-parameter Weibull equation to describe size effects on the crushing strength reported in the literature is discussed. Furthermore, a Weibull statistical analysis was carried out for a wide number of experimental results on rock aggregates, where it has been observed that strength decreases with particle size.
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The in-plane dynamic crushing behavior of re-entrant honeycomb is analyzed and compared with the conventional hexagon topology. Detailed deformation modes along two orthogonal directions are examined, where a parametric study of the effect of impact velocity and cell wall aspect ratio is performed. An analytical formula of the dynamic …
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In the formula, A and b are characteristic parameters of the materials, which are yielded by regression fitting according to the 15 sets of t 10 = f(E CS) data obtained in the experiment.The product of A and b can be used as a measure of the strength of impact crushing resistance of the ore. The greater the product, the finer the fragment …
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The coarse aggregates obtained by different crushing mechanisms (jaw and impact crushers) show very similar characteristics in terms of binder content assessed by acid leaching (27.5 and 26.6 wt.%), water absorption (8.76 and 9.75 wt.%) and porosity (18.6 and 20.2 vol.%).Thus, it is not possible to conclude that any of these mechanisms …
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For wood there is a significant enhancement in the crushing strength with increasing impact velocity and this has been attributed by Reid et al. [2], [3] to inertial effects in the cellular array including microinertia which affects the initial crushing strength of wood loaded along the grain in the same way that lateral inertia of the cell ...
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Crushing test and Impact test are very important to estimate strength and toughness characteristics of the road aggregate. Extensive experimental procedures and different sets of equipment are ...
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However, in the case of smaller fractions (4–8 mm), the impact of the crushing process on the value of the crushing strength indicator is smaller, and, thus, the strength properties of the aggregates (gravel and grit) are less important than in case of the grits obtained as a result of crushing (fraction 10–14 mm).
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Erosional agencies attack rock in a variety of ways such as by wear, abrasion, impact, crushing and plucking. The most important rock properties are those which reflect these processes. Rock properties can be grouped into three classes: ... Properties which relate to the strength of rock. Strength can be assessed in a number of ways, e.g ...
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This paper presents different ways of modelling the strength of corrugated fibreboard (CFB) subjected to different levels of pre-crushing. The strength performance was measured through four-point bending loading and edge crush test (ECT).
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The degradation of rockfill materials in certain surrounding environments is directly related to the deformation of many important geotechnical structures. This study aims to systematically reveal the effects of temperature and relative humidity on the crushing strength of rockfill materials at the particle scale. To this end, a series of …
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Strength indices such as point load index, impact strength index, aggregate impact value, aggregate crushing value and durability indices such as slake durability index, aggregate abrasion value are the furthermost parameters being evaluated and applied for engineering structures, building stones and construction aggregates.
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This paper compares the use of jaw and impact secondary crushing for producing coarse recycled aggregates from concrete wastes, obtained from road …
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As the grain instability may significantly impact its crushing strength, the index M and the 8 shape descriptors are used as input features to train the ML model. The model output is the grain crushing strength obtained by FDEM simulation. There is a wide variety of ML algorithms that can be used in multivariate regression.
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For the in-plane crushing strength analysis of conventional honeycombs, Ruan et al.[18] revealed the dynamic behavior of hexagon honeycombs under the in-plane impact by means of the finite element simulation, where the influences of honeycomb cell wall aspect ratio and impact velocity on the mode of localized deformation were …
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Under 10 m/s impact, the crushing strength of the honeycomb with the cell-wall angle 75° is diminished to only 10% of that of a regular honeycomb. It reveals that the cell configuration does have significant influence on the crushing strength of the honeycombs under low-velocity impact, and this offers a guideline for the design of …
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In this study, the fractal particle-size-distribution theory was used to calculate the surface areas of coal particles after impact crushing. Combining the surface area …
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