Adding detergent to concrete mix? Answered
My father (sadly departed) used to add a dash of washing up liquid (detergent) to his concrete when mixing, and I never asked him why. I presume that is must have improved the 'workability' of the mix, or perhaps how easily it mixed. Does anyone else do this? What is the definitive reason? Would a small amount of detergent alter the final strength of the concrete under compression or flex? He was pretty smart, but I don't think he would have come up with the idea himself (although he was a chemistry teacher....).