Title
Mesoscopic modeling of the impact behavior and fragmentation of porous concrete
Author
Ozbek, A.S.
Pedersen, R.R.
Weerheijm, J.
van Breugel, K.
Publication year
2019
Abstract
This study presents the numerical analyses conducted to investigate the impact behavior of different porous concretes, which have also been cast and tested experimentally. For a realistic representation of the real porous concretes containing arbitrary shaped air pores, a mesh generation code was developed in which the aggregates in the mixtures were directly extracted through computed tomography. In the code, mineralogically different aggregates in porous concretes with gravel could also be individually defined. In the explicit finite element analyses conducted, porous concrete was considered as a four-phase material, consisting of aggregates, interfacial transition zones (ITZ), bulk cement paste and air. The pore size distribution and the fragmentation behavior of the concretes were also numerically analyzed. Among the parameters that have been investigated both numerically and experimentally, aggregate grading, which determines the porosity and pore size distribution of the material, was found to have a dominant effect on the strength as well as the fragmentation properties of porous concretes. Although the amount of ITZ is higher in mixtures containing finer aggregates, those mixtures had higher impact strengths compared to coarser aggregate ones again owing to their much finer pore structures. © 2019 Elsevier Ltd
Subject
Observation, Weapon & Protection Systems
CBRN - CBRN Protection
TS - Technical Sciences
Explicit finite elements
Fragment
Impact strength
Pore size distribution
Porous concrete
Aggregates
Computerized tomography
Concrete aggregates
Grading
Mesh generation
Mixtures
Pore size
Pore structure
Size distribution
Explicit finite element analysis
Fragmentation behavior
Interfacial transition zone
Mesoscopic modeling
Porosity and pore size
Concrete mixtures
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http://resolver.tudelft.nl/uuid:23b09663-43aa-47c2-a8ff-16d784a3b5d3
DOI
https://doi.org/10.1016/j.cemconcomp.2019.04.020/
TNO identifier
866867
Publisher
Elsevier Ltd
ISSN
9589-465
Source
Cement and Concrete Composites, 102, 116-133
Document type
article