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Courses » Hydration, Porosity & Strength of Cementitious Materials
Unit 2 - Assignment 0
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Week 1 - General Discussion on Concrete and its Properties
Week 2 - Aggregates, Mix Design of concrete and Chemical Admixtures
Week 3 - Portland Cement Based Paste Systems
Week 4 - Portland Cement Based Paste System (contd.) and heat of hydration Week 5 - Mineral
Quiz : Assignment 0 Assignment 0-Solution
Due on 2019-02-04, 23:59 IST.
1) 1 point
2) 1 point
3) 1 point
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In the context of chemical complexes in ordinary portland cement, identify the FALSE statement.
One of the hydration products of C3S is referred to as tobermorite gel C3S, C2S, C3A and C4AF are generally referred to as ‘Bogues compounds’
C2S is responsible for the later-age strength gain during the hydration of cement C3A and C4AF react during the first 2 to 4 hours after water is added to portland cement No, the answer is incorrect.
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C3A and C4AF react during the first 2 to 4 hours after water is added to portland cement In the context of addition of gypsum during the manufacture of portland cement, identify the TRUE statement.
The addition of gypsum affects the setting time behavior of cement Gypsum affects the strength development of cement
Gypsum affects both the setting time and strength development behavior of cement Gypsum neither affects the setting time nor strength development behavior of cement No, the answer is incorrect.
Score: 0
Accepted Answers:
Gypsum affects both the setting time and strength development behavior of cement In the context of fineness of cement, identify the FALSE statement.
Fineness of cement is determined using the Blaine’s apparatus
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Accepted Answers:
The rate of heat of hydration is independent of the fineness of cement
In the context of coarse aggregate used in concrete, identify the TRUE statement.
Flaky aggregates increase the strength of concrete due to interlocking between aggregates Rounded aggregates increase the workability of concrete due to higher paste requirement Gradation of aggregates (particle size distribution) is not an important criterion in the selection of aggregates
According to the provisions of IS 456:2000, the nominal maximum size of aggregate should be less than ¼ of the minimum thickness of member
No, the answer is incorrect.
Score: 0
Accepted Answers:
According to the provisions of IS 456:2000, the nominal maximum size of aggregate should be less than ¼ of the minimum thickness of member
In the context of concrete, identify the FALSE statement.
For the same w/c ratio, the strength of concrete is higher than that of cement paste and mortar
According to the provisions of IS 10262, the target mean strength of concrete mix should be equal to the characteristic strength plus 1.65 times the standard deviation
Stress strain curve of concrete may be taken to be linear upto about 30-40% of the ultimate load (strength)
Concrete shows strain softening behavior after the ultimate load in a strain-controlled test No, the answer is incorrect.
Score: 0
Accepted Answers:
For the same w/c ratio, the strength of concrete is higher than that of cement paste and mortar
