Type of cement for shower pan
I recently floated a shower pan using Quickcrete sand mix. This was done on an already formed shower base (sunk about 5 inchs) concrete slab. I used a latex fortifier in the sand mix and I thought all had gone well until two days later when I checked it, the sand mix had not adhered to the concrete base and had almost warped up in a couple corners. This was laid about 2.5 inchs deep at the edges and as much as an inch at the drain. In fact, tapping around the base, it was evident it had not adhered anywhere. This was proven when I decided to pull up the pan and it was way too easy just peeling off the concrete slab. Should I have used a bonding agent? Was there some other prep I should have done to the concrete base to prevent the lifting? In reading the Quickcrete instructions, it stated I couldn't use both the bonding agent and the fortifier. Any advice on what I should have done would be appreciated.