What is the difference in strength of concrete produced using a 10mm and 20mm All-in Ballast respectively?
A 10mm All-in Ballast will generally have a greater surface area than 20mm All-in Ballast, and consequently requires slightly more cement to coat the grains to achieve an equivalent strength mix. However, the difference is slight – about one third of a ballast is made up of sand or fine aggregate, and this sand will make up the greatest part of the total surface area of the whole.
