26 Questions
What is the result of water entering between the sheets of the units described in the text?
They expand readily
Which method is used for the determination of swelling potential in the text?
Oedometer test
What percentage of montmorillonite mineral in soils can lead to swelling problems?
More than 20%
What does the activity method determine in the text?
Crack patterns
What do diagonal cracks around window and door openings indicate according to the text?
Foundation movement
What is the main characteristic of expansive soils?
They swell when moisture increases and shrink when moisture decreases
Which mineral is highly expansive among montmorillonite, kaolonite, and illite?
Montmorillonite
What is the estimated aerial coverage of expansive soils in Ethiopia?
24.7 million acres
What type of structure is particularly susceptible to damage from expansive soils?
Pavements
Which type of rock mainly forms montmorillonite?
Igneous rock
What causes expansive soils to swell and shrink?
Change in moisture
Which natural hazard can expansive soils cause more damage to, according to the text?
Floods
What is the main characteristic of montmorillonite mineral?
Highly expansive
Which type of rock mainly forms kaolonite and illite minerals?
Sedimentary rocks
What is the estimated aerial coverage of expansive soils in Ethiopia?
24.7 million acres
What is the result of structures not being designed to withstand the stresses and strains caused by expansive soils?
Structural cracking
What is the swelling potential defined as in the text?
The percentage of swell of a laterally confined sample in an oedometer test under a surcharge load
What do diagonal cracks around window and door openings indicate according to the text?
Foundation movement
What is the most well known example of expansive soils mentioned in the text?
Black cotton soil
What is the swelling pressure defined as in the text?
The pressure required for preventing volume expansion in soil in contact with water
What is used for the determination of swelling potential according to the text?
Free swell tests
What is the relation between the swelling potential of clays and the plasticity index based on the text?
It is directly proportional
What does black cotton soil look like?
Grey to black in color
What is the structure similar to that of expansive soils according to the text?
A book with leaves stacked one above the other
What characteristic causes swelling problems in soils according to the text?
The percentage of montmorillonite mineral exceeding 20%
What method provides information on the amount of heaving that is to be anticipated?
Free swell tests
Test your knowledge on the characteristics of expansive soils and the impact they can have on foundations and structures. This quiz covers the definition of expansive soils, their origin, and the potential damage they can cause to various types of structures.
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