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

被引：107

作者：

Ke, Y. ^{[1
]}

Ortola, S. ^{[1
]}

Beaucour, A. L. ^{[1
]}

Dumontet, H. ^{[2
,3
]}

机构：

[1] Univ Cergy Pontoise, Lab Mecan & Mat Genie Civil, EA 4114, F-95000 Cergy Pontoise, France

[2] Univ Paris 06, UMR 7190, Inst Jean de Rond dAlembert, F-75005 Paris, France

[3] CNRS, UMR 7190, Inst Jean de Rond dAlembert, F-75005 Paris, France

来源：

CEMENT AND CONCRETE RESEARCH | 2010年 / 40卷 / 11期

关键词：

Lightweight aggregate concretes (LWAC); Interfacial transition zone (ITZ); Elastic moduli; Composite; Modelling; ELASTIC PROPERTIES; MECHANICAL-PROPERTIES; STRENGTH; BEHAVIOR; HOMOGENIZATION; DAMAGE; MODULI;

D O I：

10.1016/j.cemconres.2010.07.001

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

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. (c) 2010 Elsevier Ltd. All rights reserved.

引用

页码：1590 / 1600

页数：11

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