Identification of microstructural characteristics in lightweight aggregate concretes by micromechanical modelling including the interfacial transition zone (ITZ)

Journal Article · Mon Nov 15 00:00:00 EST 2010 · Cement and Concrete Research

DOI:https://doi.org/10.1016/j.cemconres.2010.07.001· OSTI ID:21418097

Ke, Y ^[1]; Ortola, S ^[1]; Beaucour, A L ^[1]; Dumontet, H ^[2]

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1. University of Cergy-Pontoise, Laboratoire de Mecanique and Materiaux du Genie Civil, EA 4114, F-95000 Cergy-Pontoise (France)
2. UPMC Univ Paris 06, UMR 7190, Institut Jean le Rond d'Alembert, F-75005, Paris (France)

An approach which combines both experimental techniques and micromechanical modelling is developed in order to characterise the elastic behaviour of lightweight aggregate concretes (LWAC). More than three hundred LWAC specimens with various lightweight aggregate types (5) of several volume ratios and three different mortar matrices (normal, HP, VHP) are tested. The modelling is based on iterative homogenisation process and includes the ITZ specificities experimentally observed with scanning electron microscopy (SEM). In agreement with experimental measurements, the effects of mix design parameters as well as of the interfacial transition zone (ITZ) on concrete mechanical performances are quantitatively analysed. Confrontations with experimental results allow identifying the elastic moduli of LWA which are difficult to determine experimentally. Whereas the traditional empirical formulas are not sufficiently precise, predictions of LWAC elastic behaviours computed with the micromechanical models appear in good agreement with experimental measurements.

• OSTI ID: 21418097
• Journal Information: Cement and Concrete Research, Vol. 40, Issue 11; Other Information: DOI: 10.1016/j.cemconres.2010.07.001; PII: S0008-8846(10)00161-4; Copyright (c) 2010 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; ISSN 0008-8846
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CONCRETES
ITERATIVE METHODS
MICROSTRUCTURE
MORTARS
PERFORMANCE
SCANNING ELECTRON MICROSCOPY
SIMULATION
SPECIFICITY
BUILDING MATERIALS
CALCULATION METHODS
ELECTRON MICROSCOPY
MATERIALS
MICROSCOPY