ITZ volume fraction in concrete with spheroidal aggregate particles and application: Part I. Numerical algorithm

Zheng, Jianjun; Guo, Zhang; Pan, Xiaodong; Stroeven, Piet; Sluys, L.J.

doi:10.1680/macr.2011.63.7.473

Cited by 48 publications

(31 citation statements)

References 21 publications

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“…Garboczi and Bentz (1997) analytically approached this problem for spherical aggregate grains. Zheng et al (2011a) extended the analytical approach to RGsimulated dispersions of ellipsoidal aggregate and applied it for estimating chloride diffusivity in concrete (Zheng et al, 2011b). Of course, further extension and generalization as to grain shape would readily be possible by HADES simulation.…”

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Porosimetry by Random Node Structuring in Virtual Concrete

Stroeven¹,

Le²,

Sluys³

et al. 2012

Image Anal Stereol

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Two different porosimetry methods are presented in two successive papers. Inspiration for the development came from the rapidly-exploring random tree (RRT) approach used in robotics. The novel methods are applied to virtual cementitious materials produced by a modern concurrent algorithm-based discrete element modeling system, HADES. This would render possible realistically simulating all aspects of particulate matter that influence structure-sensitive features of the pore network structure in maturing concrete, namely size, shape and dispersion of the aggregate and cement particles. Pore space is a complex tortuous entity. Practical methods conventionally applied for assessment of pore size distribution may fail or present biased information. Among them, mercury intrusion porosimetry and 2D quantitative image analysis are popular. The mathematical morphology operator "opening" can be applied to sections and even provide 3D information on pore size distribution, provided isotropy is guaranteed. However, aggregate grain surfaces lead to anisotropy in porosity. The presented methods allow exploration of pore space in the virtual material, after which pore size distribution is derived from star volume measurements. In addition to size of pores their continuity is of crucial importance for durability estimation. Doublerandom multiple tree structuring (DRaMuTS), introduced earlier in this journal and random node structuring (RaNoS) provide such information.

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Section: Discussionmentioning

confidence: 99%

“…Zheng et al (2011a) provide numerical data for ITZ volume fraction (V ITZ ) at spherical aggregate volume fractions (V agg ) of respectively 0.6 and 0.75 as listed in Table 2. Fig.…”

Section: Data Inmentioning

confidence: 99%

Porosimetry by Random Node Structuring in Virtual Concrete

Stroeven¹,

Le²,

Sluys³

et al. 2012

Image Anal Stereol

Self Cite

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“…Models based on the equivalent modulus method especially, seem to be a natural choice because they model the concrete as a composite made of mortar and aggregates. A number of researchers have studied the elastic properties of concrete using equivalent modulus methods, such as the selfconsistent method (Hashin and Monteiro, 2002;Ramesh et al, 1996), the Mori-Tanaka method (Ricaud and Masson, 2009;Yang and Huang, 1996), and numerical methods such as discrete element model (He et al, 2012;Zheng et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

A micromechanical model for concrete under static loading

Teng¹,

Li²,

Liu³

2014

Magazine of Concrete Research

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A micromechanical model is developed to describe the stress-strain behaviours of concrete under uniaxial compression. Two kinds of defects are considered, namely microcracks around the mortar-coarse aggregate interface or the interfacial transition zone and aligned coalesced cracks in the concrete. The mortar-coarse aggregate interfaces (interfacial transition zone) are modelled as spring layers between the mortar matrix and the inclusions (aggregates) and the existences of the microcracks in the interfacial transition zone are considered as reductions of the spring parameters under the frame of the Mori-Tanaka method. The aligned coalesced cracks in concrete (mortar + aggregate) are treated as void inclusions in the matrix of concrete using the Mori-Tanaka scheme as well. Stochastic evolution rules are adopted for both defects. The numerical examples are worked out and the proposed model is shown to be capable of estimating the moduli of concrete under its whole loading process.

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“…For instance, Garboczi and Bentz [3] calculated the volume fraction of interfacial layers around spherical particles applying a theory of the nearest-surface distribution functions [4]. On the other hand, Bentz et al [5] and Zheng et al [6] simulated the volume fraction of interfacial layers around ellipsoidal particles using a similar Monte Carlo random point sampling technology, respectively. Unfortunately, both numerical results are just opposite.…”

Section: Introductionmentioning

confidence: 99%

Theoretical estimation for the volume fraction of interfacial layers around convex particles in multiphase materials

Chen

et al. 2013

Powder Technology

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ITZ volume fraction in concrete with spheroidal aggregate particles and application: Part I. Numerical algorithm

Cited by 48 publications

References 21 publications

Porosimetry by Random Node Structuring in Virtual Concrete

Porosimetry by Random Node Structuring in Virtual Concrete

A micromechanical model for concrete under static loading

Theoretical estimation for the volume fraction of interfacial layers around convex particles in multiphase materials

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