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The coarse aggregates act like bone in concrete. If we use low quality aggregate in concrete mix, the strength of concrete will be low. The amount of aggregate greatly affects the properties of hardened concrete. Increasing the amount of aggregate at a constant cement content reduce the concrete strength. Strength of concrete can also be affected by the type of aggregate. Such as, angular and rough surface concrete increase the concrete strength.
Concrete has a rougher texture than screed because it contains aggregate and stones â as well as sand and cement. These small stones are typically 20mm or less and are easily visable in the concrete when it is liquid. This is what makes concrete the stronger material. Screed is a type of mortar. It is a smoother mixture made from sand and cement, a soil-type substance and it does not have the gravelly aggregate, the maximum grain size is around 4mm for a dry screed. This allows for a finer grain appearance when compared to concrete in its liquid form.