This set of Concrete Technology Multiple Choice Questions & Answers (MCQs) focuses on “Road Method of Mix Design”.
1. According to IRC:15-2011, Characteristic Flexural Strength at 28 days is ____________
a) 4 N/mm2
b) 4.5 N/mm2
c) 5 N/mm2
d) 3.5 N/mm2
View Answer
Explanation: According to IRC:15-2011, Characteristic Flexural Strength at 28 days is 4.5 N/mm2 and rest all values don’t stand anywhere.
2. According to IRC:15-2011 _______% Fly ash is required to be replaced with the total cementitious materials.
a) 15
b) 20
c) 25
d) 30
View Answer
Explanation: According to IRC:15-2011, 20% Fly ash is required to be replaced with the total cementitious materials and 25% was according to IRC:15-2002.
3. According to IRC:15-2002 _______% Fly ash is required to be replaced with the total cementitious materials.
a) 15
b) 20
c) 25
d) 30
View Answer
Explanation: According to IRC:15-2002, 25% Fly ash is required to be replaced with the total cementitious materials and 20% was according to 2011.
4. According to IRC:15-2002, Maximum nominal size of aggregates is ________
a) 20 mm crushed aggregates
b) 31.5 mm crushed aggregates
c) 25 mm crushed aggregates
d) 30.5 mm crushed aggregates
View Answer
Explanation: According to IRC:15-2002, the maximum nominal size of aggregates is 20 mm crushed aggregates and 31.5mm was according to 2011.
5. According to IRC:15-2011, Maximum nominal size of aggregates is ________
a) 20 mm crushed aggregates
b) 31.5 mm crushed aggregates
c) 25 mm crushed aggregates
d) 30.5 mm crushed aggregates
View Answer
Explanation: According to IRC:15-2011, the maximum nominal size of aggregates is 31.5 mm crushed aggregates and 20mm was according to 2002.
6. According to IRC:15-2011, Minimum cement content for 4.5 N/mm2 characteristic flexural strength for OPC shall _____________
a) Shall not be less than 360 kg/m3
b) Shall not be less than 425 kg/m3
c) Shall not be less than 340 kg/m3
d) Shall not be less than 500 kg/m3
View Answer
Explanation: According to IRC:15-2011, Minimum cement content for 4.5 N/mm2 characteristic flexural strength for OPC shall not be less than 360 kg/ m3 and for pcc it shouldn’t be less than 425 kg/m3.
7. According to IRC:15-2011, Minimum cement content for 4.5 N/mm2 characteristic flexural strength for PPC shall _________
a) Shall not be less than 360 kg/m3
b) Shall not be less than 425 kg/m3
c) Shall not be less than 340 kg/m3
d) Shall not be less than 500 kg/m3
View Answer
Explanation: According to IRC:15-2011, Minimum cement content for 4.5 N/mm2 characteristic flexural strength for OPC shall not be less than 425 kg/ m3 and for opc it shouldn’t be less than 360 kg/ m3.
8. According to IRC:15-2011, Minimum cement content for 4.5 N/mm2 characteristic flexural strength for OPC + fly ash mix OPC shall ____________
a) Shall not be less than 360 kg/m3
b) Shall not be less than 425 kg/m3
c) Shall not be less than 340 kg/m3
d) Shall not be less than 500 kg/m3
View Answer
Explanation: According to IRC:15-2011, Minimum cement content for 4.5 N/mm2 characteristic flexural strength for OPC + fly ash mix OPC shall not be less than 340 kg/m3 and for opc it shouldn’t be less than 360 kg/m3.
9. According to IRC:15-2011, maximum free W/C ratio for OPC is ________________
a) .45
b) .4
c) .5
d) .55
View Answer
Explanation: According to IRC:15-2011, maximum free water cement ratio for Ordinary Portland Cement is .45 and for PPC it’s .5.
10. According to IRC:15-2011, maximum free W/C ratio for PPC is _________
a) .45
b) .4
c) .5
d) .55
View Answer
Explanation: According to IRC:15-2011, maximum free water cement ratio for PPC is .5 and for opc it’s .45.
Sanfoundry Global Education & Learning Series – Concrete Technology.
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