Textbook AAR Damage in concrete samples

We are currently carrying out numerous Damage Rating index analysis on RILEM test (AAR-4.1 and AAR-3) samples. Along the process of images we frequently come along with text-book examples of ASR damage in our Lab samples. Here is one under UV light.

Sample info:

Prism from RILEM AAR-3 Test on Norwegian Aggregates (Original Mix)
Age 364 days old @ 38°C RH 100%. No Alkali boosting.

Editor's Note: It's weird how we (ASR researchers) enjoy cracks (evidences) in our samples, while it is absolutely bad news for structures and clients.