Mesoscopic modeling of the impact behavior and fragmentation of porous concrete

Agar Ozbek, Ayda Safak; Pedersen, Ronnie Refstrup; Weerheijm, J.; van Breugel, K.

doi:10.1016/j.cemconcomp.2019.04.020

Mesoscopic modeling of the impact behavior and fragmentation of porous concrete

Title

Mesoscopic modeling of the impact behavior and fragmentation of porous concrete

Author

Agar Ozbek, Ayda Safak (Istanbul Technical University)
Pedersen, Ronnie Refstrup (Aalborg University; Ramboll)
Weerheijm, J. (TU Delft Applied Mechanics; TNO)
van Breugel, K. (TU Delft Materials and Environment)

Date

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.

Subject

Explicit finite elements
Fragment
Impact strength
Pore size distribution
Porous concrete

To reference this document use:

http://resolver.tudelft.nl/uuid:dbf5d931-3c21-4b36-a10c-8729c3ff22da

DOI

https://doi.org/10.1016/j.cemconcomp.2019.04.020

Embargo date

2021-04-25

ISSN

0958-9465

Source

Cement and Concrete Composites, 102, 116-133