First of all, what is meant by “water wet”? This term refers to when the concrete has water on the surface and still needs to evaporate. However, sometimes it is not always easy to tell when it is still “water-wet” because of different factors or reasons. One reason is when there is an excess of water within the slurry mix. This can cause the concrete to dry weaker, more porous and prone to cracking. The second reason is that during the drying process, shrinkage cracks can form. This will open permeable pathways to the surface of the concrete. The last reason is structural cracks/imperfectly sealed joints. Similar to shrinkage cracks, this will allow for capillary pathways to form to the surface of the concrete. Overall, these are the main reasons that can cause concrete to still be “water-wet” at a microscopic level.