Now let’s talk about your power drill.
A mixer drill is a type of drill with paddled attachments or blades that help in the mixing of concrete. The shape of the paddle or blades depends on the components that make up your concrete. The design of a mixer drill ensures the best mixing of your content. The power and speed of a mixer drill depend on different characteristics.
For mixing concrete, a normal drill may be not applicable as it is only designed to mix small batches and in short span of mixing time. Using it for concrete mixing, may cause your drill to overheat and possible destroyed. There are dedicated power drills applicable for concrete mixing which is designed for mixing concrete mixture in long period of time and in big batches.
Ideally, your power drill should be of minimum 1300 watts. This power drill should be able to mix big batches without it overheating. The speed of rotation should be at least 500 rpm or some of the high-end power drill which can have a rotation speed of 700 rpm.
If able, you can choose power drills with adjustable rotation so that you can manipulate the rotation speed in your liking, maintaining control of the quality of your mixture.