EFFECT OF REINFORCEMENT ON AAR EXPANSION IN CONCRETE

摘要

To design for disruptive deformation and structural distress due to alkali-aggregate reactivity (AAR), it is important to have an understanding of the basic mechanics of reactivity and its effect on cracking, the engineering properties of deteriorating concrete and, the resulting structural deformations. From tests on concrete prisms, made with concrete with reactive aggregates and different reinforcement contents, it was shown that the expansions due to AAR were reduced by about 30% and 60% with steel contents of 0.8% and 7% of the cross-sectional area, respectively. These results compare favorably with those from other investigators, and lead to the conclusion that the expansion in concrete due to AAR can be controlled by amount and location of steel reinforcement. In addition, the results of tests on 100 × 200mm cylinders, demonstrate that the engineering properties of concrete-compressive, tensile strengths and the elastic modulus decrease with an increase in the expansion of the concrete due to AAR.