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Study on the influence of microcracks of coarse aggregate
2023.9.2 In order to avoid the influence of the real particle shape on the particle crushing strength, the subsequent virtually generated particles are uniformly spherical particles. This study focuses on the crushing process of a single coarse aggregate with a particle size of 19–26.5 mm.
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Impact of coarse aggregate morphology andseparation
2024.7.15 Three types of coarse aggregates are applied, including crushed granite, irregular gravel, and rounded pebble, in order to accurately assess the effect of these aggregate morphology characteristics on concrete performance, and for the purpose of eliminating the interference of other parameters, the maximum particle size of each aggregate is ...
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Numerical simulation of influence of coarse aggregate crushing
2022.8.1 The effect of coarse aggregate crushing on the mechanical properties of normal concrete and high-strength concrete during the uniaxial compression test is investigated. The findings reveal that: (1) The coarse aggregate crushing affects the concrete stress–strain curve.
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INFLUENCE OF COARSE AGGREGATE SHAPE ON THE
The change in rotation angle of coarse aggregate was found to correlate well with the internal resistance of a HMA mix. The particle index (PI) was shown to be an adequate measure of the combined contribution of particle shape, angularity, and
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Impact of mechanical resistance of aggregate on
2020.12.1 Research included aggregate crushing resistance and mechanical properties of 24 concretes with: basalts, granites, granodiorite, dolomite, quartzite, gravels from 13 Polish and Ukrainian mines. Properties of concretes are consistent with aggregate strength.
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Experimental study of concrete mixes using crushed and uncrushed coarse ...
2024.1.18 The 7-day compressive strength represents 75% of the 28-day compressive strength for ACI method, whereas in DoE reaching up to 73% and 77% for crushed and uncrushed coarse aggregate, respectively. The main objective of this research is to investigate experimentally the effect of crushed and uncrushed coarse aggregate on the properties of ...
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Image-Based Coarse-Aggregate Angularity Analysis and Evaluation ...
2020.3.27 This research proposes image-based methods to quantitatively analyze the angularity of coarse aggregates, thereby providing corresponding evaluation standards. First, aggregate levels of 4.75–9.5, 9.5–13.2, and 13.2–16 mm were obtained by sieving experiments, which were then abraded 0, 400, 800, and 1,200 times using a Los Angeles ...
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Crushing Characteristics of Coarse Aggregates
2022.8.25 Six types of coarse aggregates were tested, including basalt aggregate, steel slag, limestone aggregate, marble aggregate, recycled concrete aggregate and slightly weathered limestone aggregate. Test results indicate
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Experimental study of concrete mixes using crushed and uncrushed coarse ...
2024.1.18 The main objective of this research is to investigate experimentally the effect of crushed and uncrushed coarse aggregate on the properties of hardened concrete (compressive strength) by adopting the American Concrete Institute (ACI) and the British Department of Environment (DoE) methods. Concrete mixes were designed, concrete cubes and cylinders
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INFLUENCE OF COARSE AGGREGATE SHAPE ON THE STRENGTH
The objectives of this paper are to evaluate aggregate characteristics including elongation, flatness, and other shape indices. The following particle shapes were selected for this study: cubical, rod, disk, and blade. The change in rotation angle of coarse aggregate was found to correlate well with the internal resistance of a HMA mix. The particle index (PI) was shown to
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Properties of high strength lightweight concrete
2023.3.23 The properties of crushed coconut shell aggregate (CSA) is comparable to other lightweight aggregates and compatible with cement so that they can be utilized for the production of LWC [12].Gunasekaran et al. [13] reported that concrete produced using crushed CSA achieved a maximum compressive strength of 27.20 MPa. A mixture of crushed coconut shell
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Evaluation on the Surface-Modified Recycled Coarse Aggregate
2024.7.30 Compressive Strength Results. The crushing resistance of coarse aggregate is a paramount factor in the precoating method adopted for this study. Before precoating, the recycled aggregate has a crushing resistance of 24.83%. The same recycled aggregate was precoated with various trials of different percentages of pond ash.
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(PDF) Investigating the Effects of Coarse Aggregate
2020.11.23 Tests were carried out to study the effect of the coarse aggregate type on the compressive strength, splitting tensile strength, fracture energy, characteristic length, and elastic modulus of ...
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Structure feature and compressive crushing behavior of
2024.1.23 Lightweight expanded clay aggregate (LECA) is a lightweight granular material, which can be used as an ideal backfilling geomaterial attributed to its porous particles. Through X-ray tomography images, it is found that LECA particle is a porous composite particle with a strong shell and a fragile core, originating from the sintering process of LECA production. Uniaxial
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Evaluation of Surface-Coated Recycled Coarse Aggregate in
2023.11.21 Alccofine coating on recycled coarse aggregate increases its strength by filling in the pores and voids, reducing porosity and increasing density. ... M-sand with a specific gravity of 2.76 was utilized as the finer aggregate. M-sand is made by crushing hard granite rocks into fine particles and is a manufactured sand that is eco-friendly and ...
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Aggregate Crushing Value Test-Objective, Apparatus, and
2023.12.26 Expressed as a percentage by weight, the coarse aggregate crushing value is determined when test aggregates undergo a specified load under standardized conditions. This numerical index signifies the strength of the aggregate, playing a crucial role in the construction of roads and pavements. A lower crushing value is preferable for roads and ...
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Effects of the recycled coarse aggregate mixing ratio on the ...
2024.6.22 Experimental plan. In this study, design strengths of 21, 24, and 27 MPa were considered. The quality of recycled aggregate concrete is managed by KCS 14 20 21 recycled aggregate concrete standards of the Korean Architectural Standard Specification [], and KCS 14 20 10 general concrete specifications are applied [].Based on the specifications, a target
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Mechanical Properties of Aggregate - Construction How
2020.4.13 Additionally, concrete made from an aggregate sample is likely to have lesser strength when compared to the strength of the aggregates separately. Experimental determination of compressive strength of coarse aggregates Aggregate Crushing Value Test . It is used to find out the strength of an aggregate sample under a steady, compressive load ...
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Impact of mechanical resistance of aggregate on
2020.12.1 The crushing strength of an aggregate was determined by means of the so-called aggregate crushing index according to PN-B-06714-40 [19], analogous to the British method of determining aggregate crushing value (ACV) according to BS 812 [18], but with some differences. A specimen of aggregate in a steel cylinder with an internal diameter of 150 ...
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Comparison of Shape Parameters and Laboratory Performance of Coarse ...
2017.8.28 The aggregate shape properties produced from the different crushing techniques influence the performance properties of the asphalt mixtures. The objective of this study was to classify the ...
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Understanding Effects of Crushing Mechanism on Aggregate
2019.10.25 3.2 Performance Tests. To understand the effect of aggregate shape on stability and packing behaviour, two widely used tests, namely VCA drc and AoR were conducted on individual sizes of coarse aggregates.. VCA drc. The VCA drc measures voids present in dry-rodded coarse aggregates. The test is useful to determine the particle packing behaviour of
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Effects of coarse aggregate angularity on the ... - ScienceDirect
2018.9.20 The contact between numerous aggregate particles is an important factor that influences the strength and transmission path of the forces between the aggregates. ... However, the polishing process, stage crushing and aggregate production process of aggregates affect their morphological properties, which affect the microstructure of asphalt ...
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Strength of Coarse Aggregates - Building Research
Strength of coarse aggregates is difficult to measure. While we talk about the strength of coarse aggregates it refers to the crushing strength of the aggregate itself. However, the required information on strength of coarse aggregates can be obtained from indirect tests: crushing strength of prepared rock samples, crushed value of bulk ...
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Study of the uniaxial compressive strength of water-sensitive ...
2024.2.29 Fundamental research on single-particle breaking and the uniaxial compressive strength (UCS) of carbonaceous mudstone aggregates at different water contents was carried out to investigate the relationship between the single-particle crushing strength and UCS. Based on elasticity theory and the superposition principle, a shape factor α was introduced to propose a
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Exploring the Potential of Pumice Stone as Coarse Aggregate
2024.4.30 3.3 Coarse Aggregate. The coarse aggregate used in this study consisted of granite crushed having a specific gravity of 2.68. The aggregate particles were retained on a 20 mm sieve is shown in Fig. 2. The fineness modulus of the coarse aggregate was determined to be 7, and it exhibited a water absorption rate of 4.4%, as illustrated in Table 1.
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Mechanical strength and drying shrinkage properties of
2014.10.15 The SEM images in Fig. 3 a show that the surface of untreated RCA is considerably more porous and is covered with a certain amount of loose cement paste (crumbs) and other small impurities, such as dust, which are loosely connected to the bulk aggregate of RCA particles as a result of the crushing process. In this stage of the treatment, the ...
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Use of recycled coarse aggregate for M40 grade concrete
2024.5.17 Decreasing natural resources of coarse fine aggregates and growing issues with trash management assistance the beneficiation of trash materials. The quality and uniformity of the recycled aggregate and the concrete generated from it are clearly influenced by the degree of processing and the original concrete's quality, according to research on recycled aggregate
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Dynamic properties of granite rock employed as coarse aggregate
2021.10.1 However, a linear elastic coarse aggregate model is not applicable for high-strength concrete, as fracture of coarse aggregate particles is common in high-strength concrete subjected to both compressive and tensile loading [7, 8]; i.e. when a propagating crack encounters a coarse aggregate particle in high-strength concrete, it goes directly ...
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