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WorksheetsFresh & Hardened Concrete
Total questions: 25
Worksheet time: 14mins
The accumulation of water on the outer surface of the concrete is:
Transpiration
Bleeding
Seggregation
Ponding
Who invented Portland cement and in which year?
William Aspdin, 1824
William Aspdin, 1840s
Joseph Aspdin, 1840s
Joseph Aspdin, 1824
Time elapsed from the instance of adding water until paste ceases to behave as fluid is called:
Initial setting time
Final setting time
Intermediate setting time
Absolute setting time
Which of the following adds a quick-setting property to cement?
Magnesium oxide
Silicon dioxide
Iron oxide
Aluminium oxide
In the figure below, what does ‘a’ represents?
Combustion chamber
Wash mill
Kiln
Dryer
In the figure what is ‘b’ and its function
Water-plasticity
Lime-strength
Sulphur-soundness
Gypsum-control setting
The initial setting time of concrete should be less than 30 minutes
True
False
The final setting time of Concrete should be not more than 10 hours
True
False
How much does a bag of cement weigh?
25 kg
40 kg
50 kg
100 kg
Fill in Blank below the manufacture process of concrete
Batching - Mixing -Transporting - (a) - Compacting
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
Is it possible to use w/c ratio as low as 0.5?
Yes
No
Pick up the correct statement from the following
Calcium fluosilicates act as a retarders
CaCl2 acts as a retarders
Gypsum acts as a retarders
Gypsum acts as an accelerators
the ease with which a freshly mixed concrete can be properly compacted and also that it can be transported, placed, and finished is called as
(a)
Workability of concrete is directly proportional to __________
Grading of the aggregates
Time of transit
Aggregates cement ratio
Water cement ratio
Workability of concrete is measured by __________
Vicat apparatus test
Slump test
Minimum void method
Talbot Richard test
What is curing?
Dehydration
Drying
Hydration
Dipping
Identify the method of curing
Ponding
Steam Curing
Acclerated Curing
Membrane Curing
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
Log Angles machine is used to test the aggregate for
crushing strength
impact value
abrasion resistance
water absorption
A lower W/C ratio leads to _____
Lesser Strength
Higher Strength
Ease to work
lower durability
This strain increases over time due to _________
Creep
Elastic modulus
Shrinkage
None of above
After the curing of 28 days, the concrete gains strength upto _____________
40%
60%
80%
100%
In Ultrasonic Pulse Velocity test, the strength and quality of concrete or rock is assessed by measuring the ___ of an ultrasonic pulse
Length
Velocity
Weight
Surface tension
Compressive strength of Concrete can be tested using following equipment
Vicat apparatus
Rebound Hammer
Vee-bee consistometer
Lechatlier apparatus
