Seven MustUse Concrete Admixtures (Additives)
Feb 19, 2012· The better the grading of the aggregates, the less water will be required. To get a concrete strength of + 40MPa, you need to add twice the amount of cement (by weight) compared to the amount of water. x cement will yield a strength + 20MPa. The more the cement content, the more surface cracks you will get.