Yes, a diamond concrete blade can cut rebar. Diamond blades are designed to cut through hard materials like concrete, brick, and stone. The diamond particles in the blade are extremely hard and sharp, allowing them to cut through the tough material. Rebar is made of steel, which is a much softer material than concrete, brick, and stone. Therefore, a diamond concrete blade can easily cut through rebar. However, it is important to note that the blade must be sharp and in good condition in order to cut through the rebar. If the blade is dull or damaged, it may not be able to cut through the rebar. Additionally, it is important to use the correct blade for the job. If the blade is too small, it may not be able to cut through the rebar. It is also important to use the correct speed and pressure when cutting the rebar. Too much pressure or speed can cause the blade to overheat and become damaged.