Per §10.2, the two most important EMPIRICAL relations on which medium-…

Question

Per §10.2, the two most important EMPIRICAL relations on which medium-strength mix design rests are:

Accepted Answer

B. {'text': 'Strength governed by w/c ratio; workability by water + fine aggregate content', 'label': 'B'}

1. §10.2 lists the two anchors: (i) compressive strength is governed by water-cement ratio, and (ii) for given aggregate characteristics workability is governed by water content and fine aggregate content.
2. Other factors (quality, batching, mixing, placing, compaction, curing) modify but do not replace these two empirical relations.
_Source: IGNOU ET-522 Block-3 Unit-10 Concrete Mix Design, §10.2, p. 6_

Answer

{'text': 'Strength governed by cement type; durability by aggregate shape only', 'label': 'A'}

Answer

{'text': 'Cost governed by labour only; quality control irrelevant', 'label': 'C'}

Answer

{'text': 'Strength tied to age only; workability tied to admixture only', 'label': 'D'}