This 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, and computational approaches are compared on the basis of the packing of the binary and …
اقرأ المزيد
Aggregate packing generator used for the simulation of aggregate in composites. It can be used especially for meso-scale analysis of concrete and asphalt composites .Example files are provided for the simulation of aggregate in notched beam "Example_Beam.m" and cylinder "Example_Cylinder.m". Generates aggregates …
اقرأ المزيد
FREE ONLINE EDUCATION PRESENTATIONS ON packing density (VIDEOS) 3-D Aggregate Shape Analysis and Packing Model. by Edward J. Garboczi. Aggregate Optimization for Concrete Mixtures with Low Cement Factor. by Mohamadreza Moini. Application of Interparticle Spacing Model to Maximize Filler Content in Concrete.
اقرأ المزيد
Abstract. Aggregate packing concepts developed in the field of high-performance cement concrete, were transposed to the field of asphalt concrete. These concepts, associated …
اقرأ المزيد
The random packing of cement particles in fresh cement paste could be studied by (1) ... Characterization of the packing of aggregate in concrete by discrete element approach. Mater Charact, 60 (2009), pp. 1082-1087. View PDF View article View in Scopus Google Scholar [3]
اقرأ المزيد
Aggregate packing density and gradation have important effects on the concrete characteristics where aggregates with higher packing density have less void content and, as a result, need lower ...
اقرأ المزيد
STANDARDS, PRACTICES and MANUALS ON AGGREGATES FOR CONCRETE. ACI CODE-318-19 (22): Building Code Requirements for Structural Concrete and Commentary (Reapproved 2022) ACI PRC-221-96: Guide for Use of Normal Weight and Heavyweight Aggregates in Concrete (Reapproved 2001) ACI PRC-225.1-20: …
اقرأ المزيد
The American Concrete Institute (ACI) is a leading authority and resource worldwide for the development and distribution of consensus-based standards, technical …
اقرأ المزيد
coarse aggregate concrete free aggregate mix proportioning packing tables packing density size distribution Strategic Highway Research Program National Academy of …
اقرأ المزيد
In concrete-based composite design and construction, packing of aggregates is one of the most important challenges (Baulea and Makse, 2014, Li and Kwan, 2014, Ghasemi and Emborg, 2019).An ideal ...
اقرأ المزيد
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 …
اقرأ المزيد
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 …
اقرأ المزيد
Designing concrete based on aggregate packing and optimized gradations can result in 25 % less cement content to reach a targeted compressive strength and less water-reducing admixture to obtain a ...
اقرأ المزيد
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 …
اقرأ المزيد
The concrete mixtures were prepared using Ordinary Portland Cement (OPC) of 53 Grade conforming to Bureau of Indian Standard Specifications (BIS) (IS: 12269–2013) [93], Natural Coarse Aggregate (NCA), Recycled Coarse Aggregate (RCA), clean river sand conforming to grading Zone II (IS: 383–1970) [94] and potable water. …
اقرأ المزيد
AbstractThis research investigates the effects of aggregate proportioning on the basis of theoretical particle packing models and verifies the predicted results with …
اقرأ المزيد
Aggregate is packed into a mould to form the structure of concrete, while cement particles are "compacted" in water between aggregate grains. The packing phenomenon for concrete is therefore significant on a …
اقرأ المزيد
workability and/or strength of the concrete, the increase in packing density of the aggregate could also be employed to improve the dimensional stability of the concrete. …
اقرأ المزيد
It is well known that the performance of concrete is dependent on the packing density of the aggregate. All existing methods of measuring the packing density of aggregate are carried out under dry condition. However, these dry packing methods are sensitive to the amount of compaction applied and do not account for the effect of water …
اقرأ المزيد
The volume of aggregates in concrete is approximately 60–75%, and so the concrete performance is strongly affected by the aggregate's properties, proportioning and packing. Optimized aggregate ...
اقرأ المزيد
An optimized aggregate particle packing density used as a base for concrete mix design provides economic, environmental and technical advantages. The particle packing density can be determined by ...
اقرأ المزيد
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 …
اقرأ المزيد
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.
اقرأ المزيد
The particle-size distribution (PSD) of aggregates considerably influences the packing density of the granular skeleton, which in turn determines the volume of voids to be filled with cement paste. As in the case of aggregate, the optimization of PSD and particle packing in a cement–SCM–filler system can be employed to develop more ...
اقرأ المزيد
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 …
اقرأ المزيد
This work is devoted to the study of fresh and hardened properties of concrete containing recycled gravel. Four formulations were studied, the concrete of reference and three concretes containing recycled gravel with 30, 65 and 100 % replacement ratios. All materials were formulated on the basis of S4 class of flowability …
اقرأ المزيد
The packing of aggregates in concrete is determined using packing density, which is defined as the volume of solids of aggregate particles to the bulk volume of aggregate (Eq. 1 ). It is assumed that the smaller-sized particles in concrete fill up the voids present in the larger-sized particles, thereby reducing the volume of voids and ...
اقرأ المزيد
The cement paste has to fill up the voids between aggregate particles and the "excess" paste will then disperse the aggregate particles to produce a thin coating of paste surrounding each aggregate for lubricating the concrete mix. In general, the higher the packing density of the aggregate, the smaller will be the volume of voids
اقرأ المزيد
LCC with 175 kg/m3 of cement dosage is an example with higher lifetime than current concrete with 250 kg/m3 of cement; depending on the XC exposure classes (corrosion induced by carbonation), the ...
اقرأ المزيد
An alternative mix design may often lead to a better and cheaper concrete. An alternative approach for the aggregate selection and combination is to aim for the aggregate mix that 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 ...
اقرأ المزيد