Concrete

How many days does it take concrete to fully cure?

• 35

• 28

• 3

• 3 hrs

How long does it take concrete to set so you can remove the forms?

• 3 days

• 6 days

• 7 hours

• 2 hours

Which of these is the BEST example of physical weathering?

• Sediment piling up at the mouth of a river

• Plant roots growing through concrete and splitting it

• Waves carrying sand away from a beach

• Small rocks being carried along a river bed

What is the primary component of concrete?

• Sand

• Cement

• Gravel

• Water

Which chemical process is responsible for the hardening of concrete?

• Evaporation

• Hydration

• Oxidation

• Sublimation

What is the typical ratio of cement to sand to gravel in concrete mix?

• 1:2:3

• 1:3:5

• 1:1:2

• 1:4:6

Which of the following is a common additive to improve the workability of concrete?

• Plasticizer

• Accelerator

• Retarder

• Fiber

Tags

NGSS.MS-PS1-2

What is the term for the time period during which concrete can be worked before it starts to set?

• Curing time

• Setting time

• Working time

• Open time

Which test is commonly used to measure the compressive strength of concrete?

• Slump test

• Tensile test

• Compression test

• Flexural test

What is the effect of adding too much water to a concrete mix?

• Increases strength

• Decreases strength

• No effect

• Increases setting time