Concrete sets hard and lasts, so it is read as permanence, firm decisions or stubbornness. Being stuck in wet concrete stands for feeling caught in a situation as it solidifies.
Has this come up in your dreams before? What was going on in your life then?
My Cosmic Code has a private dream journal. Write a dream down and the app picks out the symbols in it, shows what dream books say about them and, over time, which words recur across your entries. The journal is stored on your device only.