You might use the words cement and concrete interchangeably, but they're actually two different materials, and one is used to ...

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Knowing the type of aggregate in the concrete or asphalt to be cut influences the performance and selection of diamond blades and drill bits. Aggregate, the stone, gravel and sand used in concrete ...

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Again, the ratio varies a bit, depending on the strength requirements of the concrete, but sand can be up to 45% of aggregate. Concrete does require a specific type of sand, though.