There are many reasons for cracks in concrete to occur and just as many solutions to resolve cracking. Test your knowledge about cracking in concrete.

 

Question 1

Concrete volume change in the form of shrinkage is typically caused by:

Question 2

Water loss can result in ____ cracking

Question 3

This type of cracking occurs due to restraint by the reinforcing steel to the movement of solid concrete materials while the concrete is plastic.

Question 4

Shrinkage-reducing admixtures (SRAs) reduce the drying shrinkage of concrete by ____.

Question 5

A crack-reducing admixture (CRA).

Question 6

One the primary benefits of synthetic macrofibers over traditional secondary steel reinforcement is that these fibers provide a __reinforcement system.

Question 7

Reducing the amount of water used in a concrete mixture will __.

Learn more about concrete cracking solutions:
 

Understanding the potential causes of cracking in combination with proper design and construction can minimize the incidence of cracks in concrete and significantly improve durability, as well as aesthetics, of a structure. Read the full article here.

 

Master Builders Solutions: Focus on preventing cracking in concrete

A A loss of water

B Low levels of coarse aggregate

C Low air content

D Cold weather environments

Correct! Loss of water is often the culprit when it comes to shrinkage in concrete.
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Oops! Not quite. Loss of water is often the culprit when it comes to shrinkage in concrete.
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A Surface

B Plastic shrinkage

C Settlement

D Drying shrinkage

E All of the above

Correct! Shrinkage due to the loss of water from plastic and hardened concrete can result in all of the above types of cracking.
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Oops! Not quite right. Shrinkage due to the loss of water from plastic and hardened concrete can result in all of the above types of cracking.
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A Surface Cracking

B Plastic Shrinkage Cracking

C Settlement Cracking

D Drying Shrinkage Cracking

E Thermal Cracking

Correct! Settlement cracking is the result of restraint to the downward movement or settling of solid materials in plastic concrete – typically by the reinforcing steel.
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Incorrect! Settlement cracking is the result of restraint to the downward movement or settling of solid materials in plastic concrete – typically by the reinforcing steel.
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A Reducing the amount of internal aggregate friction

B Increasing concrete’s tensile strength capacity

C Enhancing cement particle hydration

D Decreasing the surface tension of water in the capillary pores

Correct. Way to go! Shrinkage-reducing admixtures work by decreasing the amount of surface tension.
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Oops!Not quite right. Shrinkage-reducing admixtures work by decreasing the amount of surface tension.
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A Significantly delays the time to cracking

B Reduces the initial crack width size if cracking occurs

C Provides a gradual reduction in stress build-up caused by drying shrinkage

D All of the above

Correct! The crack-reducing admixture performs all of the above features.
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Incorrect! The crack-reducing admixture performs all of the above features.
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A 2- dimensional

B 3-dimensional

Correct! BASF’s synthetic macrofibers provide 3-dimensional concrete reinforcement.
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Oops! BASF’s synthetic macrofibers provide 3-dimensional concrete reinforcement.
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A Increase the potential for cracking

B Reduce the potential for cracking

C Have no effect on the potential for cracking

Correct! Reducing the amount of water in concrete reduces its potential for cracking.
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Oops! Not quite. Reducing the amount of water in concrete reduces its potential for cracking.
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