Three-dimensional shape analysis of coarse aggregates: New techniques for and preliminary results on several different coarse aggregates and reference rocks

Erdoğan, Sinan T.; Quiroga, Pedro Nel; Fowler, D W; Saleh, H A.; Livingston, Richard A.; Garboczi, Edward J.; Ketcham, Peter M; Hagedorn, John G.; Satterfield, Steven G.

doi:10.1016/j.cemconres.2006.04.003

Cited by 112 publications

(55 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Existen otros métodos con un grado mayor de sofisticación que emplean tomografía computada, microscopio electrónico de barrido, láser, procesamiento de imáge-nes, redes neuronales, fractales, o midiendo la resistencia al corte, etc., los que pueden resultar adecuados para trabajos de laboratorio pero son complejos para aplicar en obras (20)(21)(22)(23)(24)(25)(26)(27)(28)(29)(30)(31). En general, el empleo de estos méto-dos se ve dificultado porque los mismos no han sido correlacionados con los métodos normalizados.…”

Section: Discussionunclassified

“…Other more sophisticated methods that use computerized tomography, scanning electron microscopy, laser techniques, imaging, neuronal networks, fractals, and shear strength measurements may prove to be suitable for laboratory trials but are too complex for field work (20)(21)(22)(23)(24)(25)(26)(27)(28)(29)(30)(31). As a rule, the use of such methods encounters obstacles because they have not been correlated to standardized methods.…”

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Fluidez de morteros cementíceos con arenas machacadas

Cabrera¹,

Traversa²,

Ortega³

2010

Mater. construcc.

View full text Add to dashboard Cite

Section: Discussionunclassified

Section: Discussionmentioning

confidence: 99%

Fluidez de morteros cementíceos con arenas machacadas

Cabrera¹,

Traversa²,

Ortega³

2010

Mater. construcc.

View full text Add to dashboard Cite

“…The function r(h,/) is, in principle, impossible to express explicitly for random shapes, but it can always be approximated by a summation of spherical harmonic functions for star-like shapes [21][22][23]. It is clear that almost of all sand and gravel used for concrete have star-like shapes (i.e., are star-shaped) [12,24,25]. The spherical harmonic expansion for r(h,/) is given in Eq.…”

Section: Mathematical Representation Of a 3d Irregular Shapementioning

confidence: 99%

“…As a general guideline, the degree n should be at least 14 and is usually no larger than 26 for common aggregates in mortar and concrete. The number of coefficients needed for accuracy and how this accuracy is determined is discussed more fully in [12,24]. In this paper, we assume that we have spherical harmonic representations of aggregates that are sufficiently accurate for our purposes.…”

Section: Mathematical Representation Of a 3d Irregular Shapementioning

confidence: 99%

Anm: a geometrical model for the composite structure of mortar and concrete using real-shape particles

Qian

Garboczi

et al. 2014

Mater Struct

View full text Add to dashboard Cite

The composite geometrical structure of mortar composites can be represented by a model consisting of sand embedded in a cement paste matrix and the structure of concrete by gravel embedded in a mortar matrix. Traditionally, spheres have often been used to represent aggregates (sand and gravel), although the accuracy of properties computed for structures using spherical aggregates as inclusions can be limited when the property contrast between aggregate and matrix is large. In this paper, a new geometrical model is described, which can simulate the composite structures of mortar and concrete with real-shape aggregates. The aggregate shapes are either directly or statistically taken from real particles, using a spherical harmonic expansion, where a set of spherical harmonic coefficients, a nm , is used to describe the irregular shape. The model name of Anm is taken from this choice of notation. The takeand-place parking method is employed to put multiple irregular particles together within a pre-determined empty container, which becomes a representative volume element. This representative volume element can then be used as input into some kind of computational material model, which uses other numerical techniques such as finite elements to compute properties of the Anm composite structure.

show abstract

“…Evaluation of the geometry of a random sample of concrete coarse aggregate has indicated that a cylindrical shape with aspect (height-to-diameter) ratio of about 1.25 ( Fig. 1) would reasonably represent the coarse aggregates used in concrete (Erdogan et al 2006).…”

Section: Modulus Of Elasticity Of Concretementioning

confidence: 99%

Development of Structure-Property Relationships for Concrete

Ghebrab

Soroushian

2011

ACT

View full text Add to dashboard Cite

Abstract:Theoretical models are developed for the prediction of the mechanical properties of mature concrete based on the morphology and interactions of its constituents. The models account for the morphology and interactions of cement hydration products, the capillary pores and microcracks. Concrete is modeled as a three-phase material composed of cement mortar, coarse aggregates and ITZ. The modulus of elasticity of concrete is determined using the Hashin's bound model for three-phase composites. Modeling of fracture toughness indicates that the frictional pull-out of coarse aggregates makes major contributions to the fracture energy of concrete. A tensile strength model is developed for concrete based on linear elastic fracture mechanics theories. The predicted theoretical models are in reasonable agreement with empirical models reflecting the experimental performance of concrete.

show abstract

Three-dimensional shape analysis of coarse aggregates: New techniques for and preliminary results on several different coarse aggregates and reference rocks

Cited by 112 publications

References 10 publications

Fluidez de morteros cementíceos con arenas machacadas

Fluidez de morteros cementíceos con arenas machacadas

Anm: a geometrical model for the composite structure of mortar and concrete using real-shape particles

Development of Structure-Property Relationships for Concrete

Contact Info

Product

Resources

About