Alkali silica reaction (ASR) can significantly affect the service life of concrete. The dissolution of aggregates has a direct impact on gel formation and thus on the macroscopic expansion. The conventional expansion tests and other investigations confirmed ASR reactivity of three aggregates from different locations in Switzerland. The reactive minerals within alpine and composite aggregates were identified using an innovative scratch-tracking method. This method helps to study aggregate dissolution if measuring the amount of released Si is not enough, because: several minerals release Si or Al and/or new phases are probable to form during dissolution experiment. The scratch-tracking method on theses alpine aggregates showed faster dissolution of feldspars and quartz while muscovite was hardly affected. The dissolution of the aggregates in solution confirmed these differences between minerals.

碱硅反应（ASR）会显着影响混凝土的使用寿命。聚集体的溶解直接影响凝胶的形成，从而影响宏观膨胀。传统的膨胀测试和其他调查证实了来自瑞士不同地点的三种聚集体的 ASR 反应性。高山和复合骨料中的活性矿物质是使用创新的划痕追踪方法确定的。如果测量释放的 Si 量不够，该方法有助于研究聚集体溶解，因为：几种矿物释放 Si 或 Al 和/或在溶解实验期间可能形成新相。这些高山骨料的划痕追踪方法显示长石和石英的溶解更快，而白云母几乎不受影响。