LAFARGE
Quiz concrete

Questions:

1. Who invented concrete?
   • The Ancient Romans
   • The Ancient Greeks
   • The Chinese
2. Among these ingredients of concrete, which is the odd man out?
   • Cement
   • Aggregates
   • Water
   • Rockwool
   • Additives
3. Which of these monuments is not made of concrete?
   • The Hassan II Mosque in Morocco
   • The Grande Arche de la Défense in France
   • The Golden Gate bridge in San Francisco
4. What quantity of concrete is produced each year worldwide?
   • 1 billion m3
   • 30 billion m3
   • 7 billion m3
5. What was the first structure ever built in reinforced concrete?
   • A bridge
   • A boat
   • A hangar
6. What is the main advantage of Agilia® concrete compared to traditional concrete?
   • Strength in compression
   • Fluidity
   • Thermal insulation performance
7. The Seonyu footbridge (The Peace Bridge) in Seoul is made from ultra-high strength Ductal® concrete. What is the thickness of the deck of the bridge?
   • 3 cm
   • 20 cm
   • 50 cm

Answers:

1. Who invented concrete?
   The Ancient Romans
   The Ancient Romans invented concrete over 2,000 years ago. One of the most remarkable monuments of the period built of concrete is the Pantheon in Rome, which has a 44 m diameter dome made out of 'light concrete', which used crushed brick, tuff and pumice stone as aggregates.
2. Among these ingredients of concrete, which is the odd man out?
   Rockwool
   Rockwool is the odd man out.
3. Which of these monuments is not made of concrete?
   The Golden Gate bridge in San Francisco
   The Golden Gate Bridge in San Francisco is made out of steel.
4. What quantity of concrete is produced each year worldwide?
   7 billion m3
   Total annual production of concrete is approximately 7 billion m3, a year - almost 1 m3 of concrete per person, per year.
5. What was the first structure ever built in reinforced concrete?
   A boat
   Reinforced concrete was first used for two boats built in 1848 by the Joseph Lambot shipyards, in France. It was in 1852 that the contractor François Coignet first applied reinforced concrete to a building structure in Saint Denis, outside Paris.
6. What is the main advantage of Agilia® concrete compared to traditional concrete?
   Fluidity
   The fluidity of Agilia® makes it possible to eliminate the stressful and noisy work of vibrating concrete when it is applied. The concrete is easy to flow and has an attractive appearance.
7. The Seonyu footbridge (The Peace Bridge) in Seoul is made from ultra-high strength Ductal® concrete. What is the thickness of the deck of the bridge?
   3 cm
   The deck of the footbridge is only 3 cm thick. Because of its excellent strength in compression, its flexural qualities and ductility, Ductal® makes such a technical achievement possible.

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