Question

Concrete reinforced with fibers (which are usually steel, glass, or plastic fibers) is less expensive than hand-tied rebar, while still increasing the tensile strength many times.

(a) True

(b) False

I had been asked this question in a job interview.

My doubt stems from R.C.C. Work and Amount topic in portion Different Type Roofs, R.C.C of Civil Engineering Drawing

Answer 1

Correct option is (a) True

To explain: A thin and short fiber, for example short, hair-shaped glass fiber, is only effective during the first hours after pouring the concrete (its function is to reduce cracking while the concrete is stiffening), but it will not increase the concrete tensile strength. A normal-size fiber for European shotcrete (1 mm diameter, 45 mm length—steel or plastic) will increase the concrete’s tensile strength.