This set of Concrete Technology Multiple Choice Questions & Answers (MCQs) focuses on “Elastic Properties of Aggregates”.
1. Clay minerals are found in most _________
a) Igneous Environment
b) Sedimentary environment
c) Metamorphic environment
d) In all environment
View Answer
Explanation: Clay minerals are common in sedimentary formations and seismic measurements are our main tools for studying sub-surface lithology.
2. Theoretical value for bulk modulus of clay __________
a) 20 and 50 GPa
b) 30 and 40 GPa
c) 100-150 GPa
d) 200 GPa
View Answer
Explanation: Theoretical value for bulk modulus of clay are reported between 20 and 50 GPa.
3. Young’s modulus for dickite is ___________
a) 5.2 GPa
b) 6.2 GPa
c) 7.2 GPa
d) 8.2 GPa
View Answer
Explanation: Young’s modulus on clay particles using atomic force acoustic microscopy is measured for dickite is 6.2 GPa.
4. The grain density of the clay powders was measured using _______
a) Hydrostatic pressure
b) Cylindrical cavity
c) Pycnometer
d) Helium porosimeter
View Answer
Explanation: The grain density of the clay powders was measured using a pycnometer.
5. To avoid trapped air produced by clay flocculation, we used ___ in distilled water.
a) (NaPO3)6
b) Na4P2O7
c) Na5P3O10
d) PO4
View Answer
Explanation: To avoid trapped air produced by clay flocculation, we used sodium hexametaphosphate in distilled water.
6. For the cold-pressed aggregate samples, porosity, bulk and grain densities were measured with __________
a) Hydrostatic pressure
b) Cylindrical cavity
c) Pycnometer
d) Helium porosimeter
View Answer
Explanation: For the cold-pressed aggregate samples, porosity, bulk and grain densities were measured at room P–T conditions with a helium porosimeter.
7. IS 456 of 2000 gives the modulus of elasticity as _______
a) Ec = 5000 fck.5
b) Ec = 5000 fck2
c) Ec = 5000 fck3
d) Ec = 5000 fck1/3
View Answer
Explanation: IS 456 of 2000 gives the modulus of elasticity as Ec = 5000 fck.5 where Ec is the modulus of elasticity in N/mm2.
8. What are elastic strains?
a) These are the instantaneous deformations that occur when an external stress is first applied
b) These deformations occur either on loss of moisture from the concrete on cooling of concrete
c) It is the time-dependent deformation that occurs on the prolonged application of stress
d) Any one or combinations of the above types of deformations in a hardened concrete leads to cracking
View Answer
Explanation: Elastic strain in concrete, as defined above, depends on the externally applied stress and the modulus of elasticity of concrete.
9. Static modulus of elasticity of concrete has been related to its ________
a) Tensile strength
b) Compressive strength
c) External strength
d) Applied force
View Answer
Explanation: Static modulus of elasticity of concrete has been related to its compressive strength by the various Standards.
10. If the value of fck is 100 then what will be the modulus of elasticity?
a) 5000
b) 500
c) 50000
d) 50
View Answer
Explanation: The modulus of elasticity as Ec = 5000 fck.5 =000*100.5 =5000*10 = =50000.
Sanfoundry Global Education & Learning Series – Concrete Technology.
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