Particle Packing Approach for Proportioning Recycled Aggregate …
Use of recycled concrete aggregate in construction industry has brought a revolutionary change in enhancing sustainability, improving economy, implementing waste management rules, conserving non-renewable energy resources. The present work gives an insight into proportioning the recycled concrete aggregates from building demolition waste to …
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A nonlinear particle packing model for micro-aggregate
However, in the concrete prepared by Fuller grading curve, the content of coarse aggregate with large particle size is relatively high, which has no strong theoretical guidance for the workability of fresh concrete. Alfred's dense packing equation holds that the fine particles in concrete have a great influence on the workability of fresh ...
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Particle packing of aggregates for concrete mix design: …
An optimized aggregate particle packing density used as a base for concrete mix design provides economic, environmental and technical advantages.
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Prediction of Aggregate Packing with Tubular …
2. Particle Packing Model of Dewar. The particle packing method based on the voids ratio of materials was introduced by J.D. Dewar [] in 1999.The voids ratio is generally defined as the ratio of total void volume to total solid volume, and it is a function of the shape and surface texture of particles and of the grading in relation to the mean size of particles.
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Packing calculations applied for concrete mix design
When selecting a concrete mix design, it is always desirable to compose the aggregates as densely as possible, i.e. with maximum packing. That minimises the necessary amount of …
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Review of Particle Packing Theories Used For …
The packing of an aggregate for concrete is the degree of how good the solid particles of the aggregate measured in terms of 'packing density', which is defined as the ratio of the solid volume of the aggregate particles to the bulk volume occupied by the aggregate, as given by: () ss1 (1) t s v. Solid volume Packing Density Totalvolume VV ...
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Application of genetic algorithm for modeling of dense packing …
Among the most important parameters affecting performance of concrete are packing density, compaction degree, and the corresponding particle size distribution (PSD) of aggregates. Better aggregate packing improves the main engineering properties of concrete: strength, modulus of elasticity, creep, and shrinkage.
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3-D random packing of polydisperse particles and concrete aggregate
The developed model has been also applied to simulating concrete aggregate grading as one important factor for high quality Portland cement concrete. The packing density results are close to those by experiments, although the aggregates of irregular shapes are modeled as spherical particles. This also indicates a direction for future research.
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Fractal dimension analysis of aggregate packing process: A numerical
In the concrete mixing, Wang's model could be used to simulate the aggregates' packing process, i.e., the crushed stone or cobblestone. As to the casting simulation, the packing process of cement particles could also be simulated based on this way.
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Gradation of Aggregates Using Standard Codes and Particle Packing …
In the present study, three of these particle packing methods i.e., Modified Toufar Method (MTM), J D Dewar method (JDD) and Compressible Packing Model (CPM) are used for the determination of gradation of coarse and fine aggregate and the optimum method of gradation is chosen based on the required type of concrete. The particle packing methods ...
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Characterization of the wall effect of concrete via random packing …
The effect of aggregate characteristics on the variation of interfacial layers in the concrete is investigated. In this work, concrete material is treated as a two-phase composite composed of coarse aggregates and mortar matrix. The aggregates in the concrete are assumed to be a series of 3D superballs-shaped particles.
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Effect of natural and recycled aggregate packing on properties …
Recycled aggregate (RA) could be re-utilized in concrete paving blocks. However, the use of RA in concrete might lead to inferior performance, which constitutes a major barrier in the wider ...
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Concrete Mix Design By Packing Density Method
Packing density is new kind of mix design method used to design different types of concrete. To optimize the particle packing density of concrete, the particles should be selected to fill up the ...
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Recycled Aggregate Concrete: Particle Packing Method …
The reuse of old concrete as a source of aggregate is a reliable alternative to Natural Aggregate (NA) in concrete construction. Because of poor quality of Recycled Aggregate (RA), the performance of Recycled Aggregate Concrete (RAC) is not up to the mark in fresh stage and hardened stage as compared to Natural Aggregate Concrete (NAC).
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Characterization of the packing of aggregate in concrete by …
The packing phenomenon for concrete is therefore significant on a meso-level as well as on a micro-level. Particle packing details will directly affect the characteristics of concrete. A high packing density of an aggregate can reduce the …
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Gradation of Aggregates Using Standard Codes and Particle Packing …
The packing density of aggregate increased by 3.75%, 13.6% and 18.4% for natural aggregate and 14.86%, 19.5% and 27.7% for recycled concrete aggregate using the proportions obtained from MTM, JDD ...
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Aggregate Packing in Concrete: The Key to Better Mix Design!
The goal of aggregate packing in concrete is to achieve the most efficient arrangement of particles. Engineers use packing models to determine the right proportions of coarse, medium, and fine aggregates. These models are based on particle size distribution (PSD), which shows the range of aggregate sizes in a mix. ...
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Concrete Mix Design By Packing Density Method
Packing density method of mix design is the only mix design method used for proportioning normal concrete, high strength concrete, no-fines concrete and self compacting concrete. No …
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Recycled aggregate concrete: Particle Packing Method …
Jacobsen and Arntsen [85] conducted experiments at different aggregate packing densities by filling the void space with cement paste and observed that there is a reduction in packing density due to interaction, aggregate shape, particle size distribution.
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Optimization of a Computer Simulation Model for Packing of Concrete
Packing of Aggregates and Concrete Mix Proportioning. As was emphasized in the case of high-performance concrete (HPC) (De Lar rard & Sedran, 1994; Sobolev, 2004), three fundamental relationships ...
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Review of Particle Packing Theories Used For Concrete …
The packing of an aggregate for concrete is the degree of how good the solid particles of the aggregate measured in terms of 'packing density', which is defined as the ratio of the solid …
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Design of Concrete Mix Proportion Based on Particle Packing …
The concrete mix design method proposed in this study was based on dense particle packing. Since the aggregate was a granular material with the largest proportion in concrete, the volume fraction of aggregate in the concrete prepared by this method increased to different degrees. The volume fraction of aggregate is shown in Table 9.
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Packing of Aggregates: An Alternative Tool to Determine …
An alternative approach for the aggregate selection and combination is to aim for the aggregate mix which has the lowest void content or the maximal packing degree. This will lead to the lowest cement consumption, porosity and shrinkage and thus the concrete with the highest performance and the lowest price.
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Development of a Computer Simulation Model for Packing of Concrete
These assemblies represent the real aggregate systems of portland cement concrete. Two variations of the algorithm are proposed: Sequential Packing Model and Particles Suspension Model. A developed multi-cell packing procedure as well as fine adjustment of the algorithm's parameters were useful to optimize the computational resources (i.e ...
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Packing Density of Aggregate: Maximizing Efficiency in …
As a measure of how effectively aggregate fills a given volume, packing density is an essential topic in concrete technology. Packing more particles into a shared space reduces …
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Modeling and Experimental Evaluation of Aggregate Packing …
AbstractThis research investigates the effects of aggregate proportioning on the basis of theoretical particle packing models and verifies the predicted results with experimental data from compaction of concrete aggregates. The experimental, theoretical, ...
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Mix design of concrete: Advanced particle packing model …
The study failed to discuss the packing particles of cement content or aggregate packing density as a basis for mix design. The investigation of Kumar and Santhanam [25] summarised the PPM to be used in selecting the concrete and mortar mix compositions by considering such factors as SCC, high performance/strength concrete in different ...
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Characterization of the wall effect of concrete via random packing …
Based on the particle packing structures in the cubic containers with semi-periodic boundaries, the effect of different aggregate characteristics on the variation of three parameters ((i.e., the volume fraction of aggregates V V, specific surface area of aggregates S V and minus third power of meaning free spacing between aggregates λ −3) is ...
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Synergetic optimizing particle size distributions of aggregate …
Regions representing the effective maximum packing and diluted packing of aggregates in concrete were identified, taking into account the dilution effect contributed by the cement paste. Aggregates located in the overlap between the diluted packing region and areas with low estimated chloride diffusivity were selected for the preparation of ...
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(PDF) Particle packing theories and their application in concrete …
The most widely used approach for optimising spherical aggregate packing density is to follow an ideal ... V. Particle packing and concrete properties, Material Science of Concrete: II, 1991 ...
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