Workability of concrete can be measured using slump, compaction factor and Vee bee time. Consider the following statements for workability of concrete:

(i) As the slump increases, the Vebe time increases

(ii) As the slum increases, the compaction factor increases

Which of the following is TRUE?

Consider the following statements for air-entrained concrete:

(i) Air-entrainment reduces the water demand for a given level of workability

(ii) Use of air-entrained concrete is required in environments where cyclic freezing and thawing is expected.

Which of the following is TRUE?

The flexural tensile strength of M25 grade of concrete, in N/mm², as per IS:456-2000 is __________.

The target mean strength f_cm for concrete mix design obtained from the characteristic strength (f_ck) and standard deviation $$\sigma$$, as defined in IS:456-2000, is