# Concrete Technology Questions and Answers – No Fines Concrete, High Density Concrete

This set of Concrete Technology test focuses on “No Fines Concrete, High Density Concrete”.

1. No fines concrete is manufactured by _______
a) By adding no fines materials from normal concrete
b) By eliminating no fines materials from normal concrete
c) By reducing its strength
d) By increasing its strength

Explanation: No fines concrete is one type of light weight concrete. As the name indicates that it is a concrete mix without fine aggregate or sand.

2. Coarse aggregates which has been used in this is of __________
a) 10 mm
b) 20 mm
c) 15 mm
d) 25 mm

Explanation: Normally coarse aggregates passing from 20 mm sieve and retained on 10 mm sieve which is further used for this type of concrete.

3. The w/c ratio is kept in the range of _______
a) .1-.2
b) .38-.52
c) .83-1
d) .25-.38

Explanation: The water cement ratio is kept within the range of 0.38-0.52. The water cement ratio should be chosen very carefully considering the cohesive nature of the materials which we are using.

4. Density of no fines concrete with normal aggregate vary from _________ kg/m3.
a) 1600-1900
b) <300
c) >2500
d) >300

Explanation: The range of the density of no fines aggregates with the normal aggregates vary from 1600-1900 kg/m3.

5. Density of no fines concrete with light weight aggregate vary from _________ kg/m3.
a) 1600-1900
b) <300
c) >2500
d) >300

Explanation: The range of the density of no fines aggregates with the light weight aggregates vary from less than 300 kg/m3.

6. The compressive strength of no fines concrete varies between __________
a) 0-5 MPa
b) 4-14 MPa
c) 25 MPa
d) >15 MPa

Explanation: The compressive strength of no fines concrete varies between the ranges of 4MPa to 14 MPa.

7. Which of the following are the disadvantages of this concrete?
a) Lightweight
b) Low strength
c) Low shrinkage
d) Good thermal insulating property

Explanation: The main disadvantage of this concrete is that it has very low strength as compared to ordinary Portland cement.

8. Which of the following are the advantages of this concrete?
a) Low density
b) Low strength
c) It can’t be use in RCC structure
d) Cannot be measured by any available standard methods

Explanation: Due to low density i.e., it is light weight which is good for our construction purpose because it will be easy to transport.

9. The range of the density for this concrete is ___________
a) >5000 kg/cu. m
b) <6000 kg/cu m
c) 3400-5600 kg/cu m
d) <3400 kg/cu m

Explanation: Test results indicate that high density concrete with densities ranging from 3400 -5600 kg/cu m.

10. The compressive strength varies from ____________
a) < 200 kg/cm2
b) > 550 kg/cm2
c) 200-550 kg/cm2
d) 700 kg/cm2

Explanation: Compressive strengths varying from 200 -550 kg/sq cm can be produced using steel punchings as coarse aggregate.

11. Due to low w/c ratio _____________
a) It doesn’t cause any problems
b) It causes problems
c) Workability is easy
d) Strength is more

Explanation: Due to low water cement ratio, it causes many problems that’s why superplasticizers are used.

12. Maximum size of aggregates are used to produce 70MPa compressive strength?
a) 20-30 mm
b) 10-20 mm
c) 30-40 mm
d) 40-50 mm

Explanation: Maximum size of aggregates is 20-30 mm are used to produce 70MPa compressive strength.

13. Maximum size of aggregates are used to produce 100MPa compressive strength?
a) 20-30 mm
b) 10-20 mm
c) 30-40 mm
d) 40-50 mm

Explanation: Maximum size of aggregates is 10-20 mm are used to produce 100MPa compressive strength.

Sanfoundry Global Education & Learning Series – Concrete Technology.

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