Q.: We seem to get more honeycombing at the bases of walls than higher up. Could this be because the first mixes were on the dry side, before we got the mixes adjusted?
A.: It could be. Concrete slump always varies slightly from batch to batch, and adjustments should be made on the basis of the slumps being measured as the day goes on. If any batch should be a little bit on the wet side it should be the first one. Don't let the first batch be too dry. Then make adjustments as needed.