What is the effect of keeping the number of revolutions for mixing at mixing speed to a minimum?

Keeping the number of revolutions for mixing at mixing speed to a minimum minimizes heat gain due to several key factors related to the mixing process. When concrete is mixed, especially at high speeds or for an extended duration, friction occurs between the materials, which generates heat. This heat can negatively affect the concrete’s properties, including its setting time and overall strength.

By limiting the number of revolutions, the amount of heat generated through mixing is reduced. This is particularly important in hot weather conditions where maintaining a lower temperature in the concrete mix can help prevent premature setting and maintain the ideal workability. Furthermore, excessive mixing can lead to a breakdown of the aggregates and separation of the components, negatively impacting the durability and performance of the finished concrete. Thus, controlling the number of revolutions helps in achieving consistent quality in the concrete work.