The effect of reinforcement on alkali-aggregate reactivity in concrete /

Alkali-aggregate reactivity (AAR) is known to cause detrimental effects in reinforced and prestressed concrete structures. To be able to design for these disruptive deformations and structural distress, it is necessary to have a clear understanding of the basic mechanics of reactivity, and its effect on cracking, engineering properties of the deteriorating concrete, and the resulting structural deformations.This research will provide a brief overview of alkali-aggregate reactions in concrete, the causes of the problem and its symptoms in existing concrete structures. The goal of this study is to assess the role of the steel reinforcement on the response of AAR-affected concrete; the paper will also review how the reaction affects the mechanical properties of concrete. Expansion and compression tests as well as Poisson's elastic modulus are being studied. The results show that reinforcement has a significant effect in decreasing the expansive effect of the AAR.Some preventive measures are reviewed, focusing on the minimization of AAR with the use of quality aggregate, portland cement, and mineral and chemical admixtures