WorksheetsConcrete
Total questions: 15
Worksheet time: 8mins
Concrete is a mixture of _____________________,___________, __________ and __________?
Water, limestone, and rocks.
California cement, pebbles, sand and glass fibers.
Portland cement, water, aggregates, and in some cases, admixtures.
Rocksalt, fiberglass and sand.
Who invented Portland cement and in which year?
William Aspdin, 1824
William Aspdin, 1840s
Joseph Aspdin, 1840s
Joseph Aspdin, 1824
How much does a bag of cement weigh?
25 kg
40 kg
50 kg
100 kg
What is the difference between concrete and cement?
They are the same.
Cement is the product of concrete.
Cement is one ingredient in concrete.
Concrete is one ingredient in cement.
Which is the function of admixture?
To reduce the cost of concrete construction
To modify that properties of hardened concrete.
To ensure the quality of concrete during mixing, transporting, placing and curing.
All of the answers are correct.
What are plasticizers?
Which adds water for workability
Which reduces water for workability
Which decreases workability at the same water content
Which oxidizes water for workability
Concrete gains strength due to
chemical reaction of cement with sand and coarse aggregates
Evaporation of water from concrete
hydration of cement
All of above
If we want to slow down the setting time of concrete, we should add_____ :
Accelerating admixture
Retarding admixture
Super - plasticizers
Air-entraining
"________ is the process where the concrete starts to harden before it gains strength".
Setting time
Workability
Bleeding & segregation
Hydration
Workability of concrete is measured by __________
Vicat apparatus test
Slump test
Minimum void method
Talbot Richard test
Workability of concrete is directly proportional to __________
Grading of the aggregates
Time of transit
Aggregates cement ratio
Water cement ratio
What is curing?
Dehydration
Drying
Hydration
Dipping
A lower W/C ratio leads to _____
Lesser Strength
Higher Strength
Ease to work
lower durability
The accumulation of water on the outer surface of the concrete is:
Transpiration
Bleeding
Seggregation
Ponding
