Damage evolution in AAR affected concretes
1990; Elsevier BV; Volume: 35; Issue: 1-3 Linguagem: Inglês
10.1016/0013-7944(90)90199-q
ISSN1873-7315
Autores Tópico(s)Concrete Properties and Behavior
ResumoAbstract Finding a means of quantifying the structural deterioration suffered by concrete buildings, bridges and dams is a high priority for studies of Alkali Aggregate Reaction (AAR). In this paper we are primarily interested in linking the change in the deformation properties to a damage index. First, a simple model is built, relating the initial elastic stiffness of a nominally undamaged cementitious system with its phase proportions, degree of hydration and aggregate modulus. Comparisons are made between the model predictions and earlier data. New results on the measured stiffness of damaged and undamaged concrete, cored from existing AAR affected structures, are then presented and an interpretation made using the model. The work attempts to provide a connection between the fabric of the material, the internal mechanisms and the macro-continuum response. The technique has potential for evaluating damage to concrete from other sources of deterioration.
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