GEOLOGY
PHYSICAL GEOLOGY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Repeated freezing and thawing of water
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Tree roots or plant roots growing bigger
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Both and A and B
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Neither A or B
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Detailed explanation-1: -A common reason for a crumbling, cracked sidewalk is poor soil conditions. Certain types of fill soil like clay absorb more water than other types of dirt. If the fill soil underneath your concrete isn’t compacted properly, it could absorb water and swell at different rates and shift beneath your concrete slabs.
Detailed explanation-2: -Shrinkage is a main cause of cracking. As concrete hardens and dries it shrinks. This is due to the evaporation of excess mixing water. The wetter or soupier the concrete mix, the greater the shrinkage will be.
Detailed explanation-3: -The cracks form due to the forces applied by turning or braking motion of vehicles. Distortions in an asphalt pavement are caused by instability of an asphalt mix or weakness of the base or subgrade layers. These distresses may include rutting, shoving, depressions, swelling and patch failures.
Detailed explanation-4: -Therefore the stresses of even small magnitude causing tension and shear stresses can lead to cracking. Internal stresses are induced in the building components on account of thermal movements, moisture change, elastic deformation, chemical reactions etc..