Study of the recycled aggregates nature’s influence on the aggregate–cement paste interface and ITZ

•Microstructure formed in interface depends of the aggregate’s nature.•Water/cement ratio condition influence of the ITZ formation.•Elasticity modulus in ITZ and cement paste diminishes when increasing the w/c ratio.•Nanoindentation and SEM permit to progress in the knowledge of the ITZ formation. T...

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Bibliographic Details
Published in:Construction & building materials 2014-10, Vol.68, p.677-684
Main Authors: Sidorova, Anna, Vazquez-Ramonich, Enric, Barra-Bizinotto, Marilda, Roa-Rovira, Joan Josep, Jimenez-Pique, Emilio
Format: Article
Language:English
Subjects:
Aggregates (Building materials)
Analysis
Cement
Cement paste
Ciment
Concrete
Enginyeria civil
Interfacial transition zone
Materials i estructures
Materials i estructures de formigó
Mechanical properties
Microstructure
Microstructure SEM
Nanoindentation
Recycled aggregates
Resistència de materials
SEM
Testing
Àrees temàtiques de la UPC
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Summary:•Microstructure formed in interface depends of the aggregate’s nature.•Water/cement ratio condition influence of the ITZ formation.•Elasticity modulus in ITZ and cement paste diminishes when increasing the w/c ratio.•Nanoindentation and SEM permit to progress in the knowledge of the ITZ formation. Today it is highly recognized that the structure of the cement paste matrix close to the aggregates, is different from the rest of the cement paste. This investigation compares the possible interfacial transition zone (ITZ) formation by means of the nanoindentation test and Scanning Electron Microscopy (SEM), with aggregate inclusions of three different natures: limestone (NA), recycled concrete aggregate (RCA) and recycled ceramic aggregate (RC). This study demonstrated that nature of the aggregate and the w/c ratio conditions determines the micro structural characteristics of the aggregate–cement paste interface and the mechanical properties of the ITZ.
ISSN:0950-0618
DOI:10.1016/j.conbuildmat.2014.06.076