TY - GEN

T1 - Predicting the elastic moduli of enhanced porosity (pervious) concretes using reconstructed 3D material structures

AU - Sumanasooriya, Milani S.

AU - Deo, Omkar

AU - Neithalath, Narayanan

N1 - Funding Information:
The authors gratefully acknowledge the financial support for this work from the National Science Foundation (NSF) through a CAREER award (CMMI 0747897) to the third author.

PY - 2009

Y1 - 2009

N2 - Enhanced Porosity Concrete (EPC), also known as pervious concrete is a macroporous material that is finding applications in parking areas and low volume pavements because of its ability to transport a large amount of storm water through its porous material structure. Majority of the current research focuses on the functional performance of this material, with scant research on its mechanical behavior. In this study, a computational procedure is implemented on two-dimensional planar images of EPC to reconstruct three-dimensional material structures. The 3D reconstructed digital image data is used as an input to a finite element program to calculate the effective linear elastic properties of the material when subjected to applied macroscopic strains. EPC consists of three phases - the aggregates, the paste surrounding the aggregates, and the pores. In order to reduce the complications associated with assigning each of these phases different elastic moduli, each aggregate (assumed to be spherical in shape) surrounded by a paste shell, is mapped into an effective particle having a uniform elastic modulus, which is then input into the program to calculate the effective elastic modulus of the composite. The paste thicknesses for different EPC mixtures are obtained from an image analysis procedure. Ultrasonic pulse velocity method is used to experimentally determine the elastic modulus of several EPC mixtures proportioned using different aggregate sizes and blends. The results of the predictions using the computational method, and the experimental values are in good agreement.

AB - Enhanced Porosity Concrete (EPC), also known as pervious concrete is a macroporous material that is finding applications in parking areas and low volume pavements because of its ability to transport a large amount of storm water through its porous material structure. Majority of the current research focuses on the functional performance of this material, with scant research on its mechanical behavior. In this study, a computational procedure is implemented on two-dimensional planar images of EPC to reconstruct three-dimensional material structures. The 3D reconstructed digital image data is used as an input to a finite element program to calculate the effective linear elastic properties of the material when subjected to applied macroscopic strains. EPC consists of three phases - the aggregates, the paste surrounding the aggregates, and the pores. In order to reduce the complications associated with assigning each of these phases different elastic moduli, each aggregate (assumed to be spherical in shape) surrounded by a paste shell, is mapped into an effective particle having a uniform elastic modulus, which is then input into the program to calculate the effective elastic modulus of the composite. The paste thicknesses for different EPC mixtures are obtained from an image analysis procedure. Ultrasonic pulse velocity method is used to experimentally determine the elastic modulus of several EPC mixtures proportioned using different aggregate sizes and blends. The results of the predictions using the computational method, and the experimental values are in good agreement.

KW - Digital image data

KW - Enhanced porosity concrete (EPC)

KW - Pervious concrete

KW - Planar images

KW - Three-dimensional structure

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U2 - 10.1533/9781845697754.275

DO - 10.1533/9781845697754.275

M3 - Conference contribution

AN - SCOPUS:84874774675

SN - 9781845697754

T3 - Brittle Matrix Composites 9, BMC 2009

SP - 275

EP - 289

BT - Brittle Matrix Composites 9, BMC 2009

PB - Woodhead Publishing Limited

T2 - 9th International Symposium on Brittle Matrix Composites, BMC 2009

Y2 - 25 October 2009 through 28 October 2009

ER -