Question

In ________ test, the workability of concrete is measured in the terms of internal energy required to compact the concrete fully.

(a) Compaction factor test

(b) Vee-bee test

(c) Rotating table test

(d) Slump cone test

I have been asked this question during an interview.

My doubt is from Cement Concrete Construction in division Cement Concrete Construction of Construction & Building Materials

Answer 1

The correct option is (a) Compaction factor test

To explain I would say: In Compaction factor test, the concrete is allowed to fall in a lower cylindrical mould of 150 mm diameter and 300 mm height through into vertical placed conical Hopper. The surplus concrete appearing about the top of the mould is removed with a trowel. The weight of concrete in the mould is then found out.