North Carolina General Contractors Practice Exam

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How does the use of superplasticizers affect water usage in concrete mixing?

It decreases the amount of water needed
It increases the amount of water needed
It has no effect on water usage
It turns water into vapor

The correct answer is: It decreases the amount of water needed

The use of superplasticizers in concrete mixing is specifically designed to improve fluidity without necessitating an increase in water content. Superplasticizers work by reducing the surface tension of cement particles, allowing them to disperse more evenly and reducing the amount of water needed to achieve the desired workability and strength of the concrete. By enabling the mixture to maintain its consistency and flow with less water, superplasticizers help in enhancing the overall performance of the concrete. This enables contractors to create a more durable and lower permeability concrete mix while potentially reducing costs related to water and materials. The other options suggest either an increase in water usage or no impact at all, which contradicts the fundamental purpose of superplasticizers in concrete technology.