Design of Reinforced Concrete Structures Prerequisite Test

Concrete is a mixture of

• Cement, sand and Aggregate
• Cement and sand
• Cement, sand, Aggregate and water
• Cement, sand and Water

In the grade of concrete M30, the 30 represents

• tensile strength
• Characteristic compressive strength
• flexural strength
• split tensile strength

Which of the following is not Admixture 1. Fly ash 2. Silica fume 3. Rice husk 4. Metakaoline

• 1and 2
• only 4
• 3 and 4
• none of these

The nominal maximum size of coarse aggregate for general work should be___

• 20mm
• 40 mm
• 160 mm
• 10 mm

The pH of water used for concrete making shall not be less than ___

• 6
• 7
• 8
• 5

The characteristic strength is defined as the strength of material below which not more than ___of test results are expected to fall

• 0.1
• 0.07
• 0.05
• 0.93

Nominal mix concrete may be used for concrete of

• M20 or Lower
• M20 or hogher
• M30 or lower
• M30 or higher

The total number of test strength of samples required to constitute an acceptable record for calculation of standard deviation shal be not less than

• 20
• 5
• 30
• 3

As a general guidance, the maximum permissible free fall of concrete may be taken as

• 1m
• 1.5m
• 2m
• 2.5m

In concrete curing process, the surface has to be kept moist for at least

• 5 days
• 6 days
• 7 days
• 4 days