Title:
DEM analysis on the role of aggregates on concrete strength

dc.contributor.author Wang, Pei
dc.contributor.author Gao, Nan
dc.contributor.author Ji, Koochul
dc.contributor.author Stewart, Lauren K.
dc.contributor.author Arson, Chloé
dc.contributor.corporatename Georgia Institute of Technology. School of Civil and Environmental Engineering en_US
dc.date.accessioned 2019-10-03T11:55:19Z
dc.date.available 2019-10-03T11:55:19Z
dc.date.issued 2019-10-02
dc.description.abstract This study aims to understand the micro-mechanisms that drive fracture propagation in concrete and to assess the roles of the strength of aggregates and of the aggregate/mortar interfacial transition zone (ITZ) on concrete strength. We use the Discrete Element Method (DEM) to model concrete samples. Mortar is represented by a volume of bonded spherical elements. Bonds are governed by a new displacement-softening law. Aggregate centroids are randomly placed in the DEM sample. We use CT scan images of real aggregates to plot 3D aggregate contours. The spherical elements that are contained in 3D contours around the randomly placed centroids are replaced by clusters with aggregate properties. The number and the size of the clusters are determined from the experimental Particle Size Distribution. The DEM concrete model is calibrated against uniaxial compression tests and Brazilian tests of both mortar and concrete. It is found that: At same aggregate volume fraction, a concrete sample with randomly placed aggregates and ITZ bonds is stronger; Concrete strength is linearly related to aggregate tensile strength; A linear relationship exists between the contact ratio in the mortar/aggregate ITZ and concrete strength; The ITZ has more influence on concrete strength than aggregate tensile strength. en_US
dc.identifier.citation Wang, et al. "DEM analysis on the role of aggregates on concrete strength". Pre-print submitted to Computers and Geotechnics en_US
dc.identifier.uri http://hdl.handle.net/1853/61888
dc.publisher Georgia Institute of Technology en_US
dc.subject Discrete Element Method (DEM) en_US
dc.subject Concrete strength en_US
dc.subject Aggregates en_US
dc.subject Interfacial transition zone en_US
dc.subject CT scan en_US
dc.title DEM analysis on the role of aggregates on concrete strength en_US
dc.type Text
dc.type.genre Pre-print
dspace.entity.type Publication
local.contributor.author Stewart, Lauren K.
local.contributor.author Arson, Chloé
local.contributor.corporatename School of Civil and Environmental Engineering
local.contributor.corporatename College of Engineering
relation.isAuthorOfPublication 60b8f550-7e84-4d16-9a91-c65a26bac475
relation.isAuthorOfPublication ce5325f0-830f-4636-bc90-7527fd99005b
relation.isOrgUnitOfPublication 88639fad-d3ae-4867-9e7a-7c9e6d2ecc7c
relation.isOrgUnitOfPublication 7c022d60-21d5-497c-b552-95e489a06569
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