Effects of particle size distribution, shape and volume fraction of aggregates on the wall effect of concrete via random sequential packing of polydispersed ellipsoidal particles

Concrete can be viewed as granular materials at the mesoscopic level. A specific distribution of aggregate particles in boundary layers, known as the wall effect, plays an important role in the mechanical properties and durability of concrete. However, the detailed and systematic experimental and simulated data about the wall effect of concrete is hardly adequate yet. Specially, the modeling study of spherical and two-dimensional (2D) elliptical aggregates distribution for the wall effect has been focused on in previous work, little is known about three-dimensional (3D) ellipsoidal aggregates. In the present work, based on a mesostructure model of concrete, the wall effect of concrete is quantified by configuration parameters such as the volume fraction, the specific surface area and the meaning free spacing of the solid phase. In addition, the influences of ellipsoidal particle size distribution (EPSD), shape and volume fraction (Vf) of ellipsoidal aggregates on the configuration parameters are evaluated by stereological methods and serial section analysis technique. Furthermore, the effect mechanisms of EPSD, shape and Vf are analyzed and discussed in this paper. The reliability of the statistical results is verified by experimental data and theoretical analytical results.

[1]  Huisu Chen,et al.  A 2D elliptical model of random packing for aggregates in concrete , 2010 .

[2]  Huisu Chen,et al.  An overlapping detection algorithm for random sequential packing of elliptical particles , 2011 .

[3]  B. Oh,et al.  PREDICTION OF DIFFUSIVITY OF CONCRETE BASED ON SIMPLE ANALYTIC EQUATIONS , 2004 .

[4]  Zvi Hashin,et al.  Thin interphase/imperfect interface in conduction , 2001 .

[5]  P. Stroeven,et al.  Local porosity analysis of pore structure in cement paste , 2005 .

[6]  Aleksandar Donev,et al.  Neighbor list collision-driven molecular dynamics simulation for nonspherical hard particles. I. Algorithmic details , 2005 .

[7]  Huisu Chen,et al.  Microstructural characterization of fresh cement paste via random packing of ellipsoidal cement particles , 2012 .

[8]  F. Stillinger,et al.  Improving the Density of Jammed Disordered Packings Using Ellipsoids , 2004, Science.

[9]  K. Iimura,et al.  Study of the Wall Effect on Particle Packing Structure Using X-ray Micro Computed Tomography , 2008 .

[10]  H. Splittgerber,et al.  Einfluss adsorbierter wasserfilme auf die Van der Waals kraft zwischen quarzglasoberflächen , 1974 .

[11]  Huisu Chen,et al.  Mesostructural characterization of particulate composites via a contact detection algorithm of ellipsoidal particles , 2012 .

[12]  Stephen R. Williams,et al.  Effect of particle shape on the density and microstructure of random packings , 2007, Journal of physics. Condensed matter : an Institute of Physics journal.

[13]  M. Moradi,et al.  Monte Carlo simulation of a confined hard ellipse fluid , 2010 .

[14]  P. Stroeven,et al.  MODERN ROUTES TO EXPLORE CONCRETE’S COMPLEX PORE SPACE , 2011 .

[15]  Cheng-Jin Du,et al.  Estimating the surface area and volume of ellipsoidal ham using computer vision , 2006 .

[16]  A. Philipse,et al.  Random packings of spheres and spherocylinders simulated by mechanical contraction. , 2003, Physical review. E, Statistical, nonlinear, and soft matter physics.

[17]  T. Ng,et al.  Contact detection algorithms for three-dimensional ellipsoids in discrete element modelling , 1995 .

[18]  Bernhard Peters,et al.  An approach to simulate the motion of spherical and non-spherical fuel particles in combustion chambers , 2001 .

[19]  Jing Hu,et al.  Gradient structures in cementitious materials , 2007 .

[20]  Aibing Yu,et al.  Discrete particle simulation of gas fluidization of ellipsoidal particles , 2011 .

[21]  Folker H. Wittmann,et al.  Drying, moisture distribution, and shrinkage of cement-based materials , 2002 .

[22]  Wei Sun,et al.  Overestimation of the interface thickness around convex-shaped grain by sectional analysis , 2007 .

[23]  L. J. Sluys,et al.  ITZ volume fraction in concrete with spheroidal aggregate particles and application: Part I. Numerical algorithm , 2011 .

[24]  M. Stroeven,et al.  Particle packing in a model concrete at different levels of the microstructure: Evidence of an intrinsic patchy nature , 2009 .

[25]  Y. Benveniste,et al.  Effective thermal conductivity of composites with a thermal contact resistance between the constituents: Nondilute case , 1987 .

[26]  Wen Chen,et al.  Determination of overlapping degree of interfacial layers around polydisperse ellipsoidal particles in particulate composites , 2014 .

[27]  Jian‐Jun Zheng,et al.  Simulation of Two-Dimensional Aggregate Distribution with Wall Effect , 2003 .

[28]  Aibing Yu,et al.  Dynamic Simulation of the Packing of Ellipsoidal Particles , 2011 .

[29]  Stefano Sacanna,et al.  Observation of a shape-dependent density maximum in random packings and glasses of colloidal silica ellipsoids , 2007 .

[30]  David W. Fowler,et al.  Some properties of irregular 3-D particles , 2006 .

[31]  M. Stroeven,et al.  Reconstructions by SPACE of the Interfacial Transition Zone , 2001 .

[32]  N. Pan,et al.  Predictions of effective physical properties of complex multiphase materials , 2008 .

[33]  Aibing Yu,et al.  Evaluation of the packing characteristics of mono-sized non-spherical particles , 1996 .

[34]  P. Stroeven,et al.  ITZ's structural evolution during hydration in model concrete , 2009 .

[35]  Edward J. Garboczi,et al.  Analytical formulas for interfacial transition zone properties , 1997 .

[36]  Ping Sheng,et al.  A generalized differential effective medium theory , 1985 .

[37]  Aibing Yu,et al.  The packing of spheres in a cylindrical container: the thickness effect , 1995 .

[38]  S. Caré,et al.  Influence of the porosity gradient in cement paste matrix on the mechanical behavior of mortar , 2010 .

[39]  Jian‐Jun Zheng,et al.  Three-Dimensional Aggregate Density in Concrete with Wall Effect , 2002 .

[40]  P. C. Kreijger.  The skin of concrete composition and properties , 1984 .

[41]  O. Coussy,et al.  The equivalent pore pressure and the swelling and shrinkage of cement-based materials , 2004 .

[42]  Xin Yu Lin,et al.  Packing of Cylindrical Particles with a Length Distribution , 1997 .

[43]  Aleksandar Donev,et al.  Neighbor list collision-driven molecular dynamics simulation for nonspherical hard particles. , 2005 .

[44]  R. D. Mindlin.  Second gradient of strain and surface-tension in linear elasticity , 1965 .

[45]  Piet Stroeven,et al.  Modern perspectives on aggregate in concrete , 2007 .