A contractor is selecting between two
concrete mixes for a bridge.

Mix A: Lowest cost, high CO2 emissions,
50-year service life.

Mix B: 15% higher initial cost, 40% lower
CO2 emissions, 80-year service life.

Based on the sustainability principles
introduced in the lecture, which is the best conclusion?

Question

A contractor is selecting between two
concrete mixes for a bridge.

Mix A: Lowest cost, high CO2 emissions,
50-year service life.

Mix B: 15% higher initial cost, 40% lower
CO2 emissions, 80-year service life.

Based on the sustainability principles
introduced in the lecture, which is the best conclusion?

Answer

Mix A is more sustainable because economic sustainability should always take priority.

Answer

Neither mix can be judged as more sustainable until environmental, social, and economic impacts are considered together.

Answer

Mix B is more sustainable because lower emissions alone determine sustainability.

Answer

Mix A is preferable because the lecture focuses on construction rather than long-term asset performance.

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