The alkali-silica reaction (ASR), developed in the presence of reactive mineral aggregates, is responsible for numerous cases of cracking and consequent deterioration of concrete structures. This work presents a contribution to the development of a chemical method for the activation of the alkali-silica reactivity of an aggregate in its commercial granulometry, in a short time, through the application of microwaves and verification of lithium nitrate addition influence to mitigate the reaction. A proven reactive granite aggregate was used at different microwave application times with fixed power of 700 W, in neutral and basic media. Results on the aggregate reactivity were obtained in 5 min of microwave application, statistically equivalent to tests with 30-day immersion. It was observed that the most affected phases during the process are non-crystalline silica, and a gel-like phase similar to the alkali-silica reaction product was also obtained at the end of the tests. In addition, a pre-treatment of the aggregate was performed with 0.5 to 2% lithium nitrate additions, with and without microwaves, in neutral and basic media. It was observed that additions of at least 0.5% significantly inhibit the silica dissolution, but with 2% of this compound, it is possible to observe the formation of a coating on the aggregate’s surface with lithium silicate.

在反应性矿物聚集体的存在下发生的碱-硅反应（ASR）导致了许多开裂和随之而来的混凝土结构劣化的情况。这项工作通过微波的应用和验证硝酸锂添加对减轻反应的影响，为在短时间内活化集料的碱-硅反应性的化学方法的发展做出了贡献。 。在中性和碱性介质中，经过验证的活性花岗岩骨料在不同的微波应用时间下以700 W的固定功率使用。聚合反应性的结果是在微波照射5分钟后获得的，在统计上等同于浸泡30天的测试。观察到在该过程中受影响最大的相是非晶态二氧化硅，并且在测试结束时也获得了类似于碱二氧化硅反应产物的凝胶状相。另外，在中性和碱性介质中，在有和没有微波的情况下，添加0.5至2％的硝酸锂对骨料进行预处理。观察到至少0.5％的添加显着抑制了二氧化硅的溶解，但是使用这种化合物的2％，可以观察到在聚集体的表面上形成有硅酸锂的涂层。在中性和基本媒体中。观察到至少0.5％的添加显着抑制了二氧化硅的溶解，但是使用这种化合物的2％，可以观察到在聚集体的表面上形成有硅酸锂的涂层。在中性和基本媒体中。观察到至少0.5％的添加显着抑制了二氧化硅的溶解，但是使用这种化合物的2％，可以观察到在聚集体的表面上形成有硅酸锂的涂层。