Roman Concrete vs Modern Concrete

Scientists have reverse-engineered Roman concrete, which is more durable than modern concrete. Roman structures have lasted thousands of years, while modern concrete can degrade in 50 years. A 2023 study revealed that using quick lime and seawater in Roman concrete creates a self-healing property. When cracks form, rainwater reactivates the lime, filling the gaps. This discovery could reduce the need for frequent repaving, cutting down on cement production, which accounts for 8% of greenhouse gas emissions.

What is a significant difference between Roman concrete and modern concrete in terms of longevity?

• Modern concrete never degrades.

• Modern concrete lasts thousands of years.

• Roman concrete can last thousands of years.

• Roman concrete lasts only a few decades.

What was one of the secrets of Roman concrete discovered a few years ago?

• Using only sand and gravel.

• Adding seawater to the mix.

• Avoiding any water in the mix.

• Using fresh water in the mix.

What role does quick lime play in Roman concrete?

• It makes the concrete lighter.

• It causes a hot chemical reaction.

• It prevents the concrete from setting.

• It makes the concrete more colorful.

How does Roman concrete repair itself when it cracks?

• It doesn't have self-repairing properties.

• Rainwater reactivates lime chunks to fill gaps.

• It absorbs moisture to expand.

• It uses embedded fibers to close gaps.

What percentage of greenhouse gas emissions was attributed to cement production in 2021?

• 12%

• 8%

• 5%

• 15%

How could self-healing concrete contribute to environmental sustainability?

• By increasing the need for new materials.

• By reducing the frequency of repairs.

• By making concrete more expensive.

• By requiring more energy to produce.