Per §10.1, concrete 'mix design' is best defined as the process of:

Question

Accepted Answer

A. {'text': 'Selecting ingredients and proportions to meet minimum strength, consistency and durability', 'label': 'A'}

1. §10.1 reads: 'Mix design can be thus defined as the process of selecting suitable ingredients of concrete and determining their relative quantities with object of producing as economically as possible, concrete of certain minimum properties, notably consistency, strength and durability.'
2. It is not just bar selection, deflection or pure QA — it is upstream proportioning.
_Source: IGNOU ET-522 Block-3 Unit-10 Concrete Mix Design, §10.1, p. 5_

Answer

{'text': 'Determining the load-deflection curve of structural slabs after the concrete has hardened', 'label': 'B'}

Answer

{'text': 'Selecting reinforcement bar diameters and spacings for a reinforced concrete beam member', 'label': 'C'}

Answer

{'text': 'Quality control of the finished hardened concrete at the construction site after stripping', 'label': 'D'}