Question

What is the allowed reduction of water with super plasticizers without reducing workability?

(a) 10%

(b) 20%

(c) 30%

(d) 40%

The question was asked at a job interview.

My doubt is from Plasticizers topic in portion Admixtures and Construction Chemicals of Concrete Technology

Answer 1

The correct answer is:

(b) 20%

Superplasticizers allow for a reduction of water content by up to 20% without compromising the workability of the concrete. These admixtures help in maintaining the desired consistency and flowability while reducing the water-to-cement ratio, which in turn improves the strength and durability of the concrete.