what makes concrete strong
This results in a C20-rated concrete mix, which means the concrete will be of medium strength. Concrete is rated on a system that indicates the strength of the mix after itâs cured for approximately a month. To make the concrete stronger, add more cement or less sand.The closer you bring the ratio to an even one-to-one of sand to cement, the stronger the rating becomes.This principles works in the opposite direction as well.his results in a C20-rated concrete mix, which means the concrete will be of medium strength. Concrete is rated on a system that indicates the strength of the mix after itâs cured for approximately a month. To make the concrete stronger, add more cement or less sand.