Why can’t the concrete be sandier or wetter so it’s easier to pour?
A. If too much sand or water is added to make the mix easier to use, the overall quality of the mix will be sacrificed. Wet, sandy concrete is easy to screed, but is weaker and more susceptible to cracking and surface blemishes such as efflorescence (unsightly white salt deposit). If too much water is used, the concrete will also be more porous as well as weaker. The more sand you put in the mix, the more water you need to make it workable, so it becomes almost a self feeding problem.
