Per §5.3.8, an INCREASE in ambient temperature generally has what effe…

Question

Per §5.3.8, an INCREASE in ambient temperature generally has what effect on the workability of a given concrete mix?

Accepted Answer

C. {'text': 'Workability falls because evaporation and hydration rate rise', 'label': 'C'}

1. §5.3.8: 'as ambient temperature increases, the workability decreases, since higher temperature will increase both the evaporation and the hydration rate.'
2. Counter-measures listed are use of admixtures, pre-cooling of materials, and use of chilled water.
_Source: IGNOU ET-522 Block-2 Unit-5 Workability & Fresh Concrete-I, §5.3.8, p. 7_

Answer

{'text': 'Workability also rises with temperature', 'label': 'A'}

Answer

{'text': 'Workability remains exactly constant at every temperature', 'label': 'B'}

Answer

{'text': 'Workability oscillates depending on the season', 'label': 'D'}