As per IS code specifications, maximum water content for 20 mm maximum nominal size of angular coarse aggregates is 186 kg per unit volume of concrete.
Match the following lists of types of aggregates and respective approximate reduction in maximum water content value mentioned above (to produce same workability):
Type of Aggregates
a. Gravel with some crushed particles
b. Rounded gravel
c. Sub-angular aggregates
Approx. Reduction in Max. Water Content
1. 25 kg
2. 10 kg
3. 20 kg
a – 3, b – 1, c – 2
a – 2, b – 1, c – 3
a – 3, b – 2, c – 1
a – 1, b – 2, c – 3
The termites which are responsible for attack on wooden materials in building are well known as
Black Ants
Red Ants
White Ants
None of the above
To determine the modulus of rupture, the size of the test specimen used is
100 mm × 100 mm × 500 mm
150 mm × 150 mm × 500 mm
100 mm × 100 mm × 700 mm
150 mm × 150 mm × 700 mm
As per IS Code for specifications of OPC 53 grade cement, what is the limit of addition of Fly Ash as a performance improver, in terms of percentage addition by mass?
5.0
7.5
10.0
12.5
Specific gravity of fine aggregates used in concrete is about
2.7
3.0
3.2
3.4
Lime mortar is generally made with
quick lime
fat lime
hydraulic lime
white lime
RMC is acronym of
Rapidly mixed concrete
Ready mixed concrete
Readily mix concrete
Recently mixed concrete
In Vicat’s apparatus, the cross-sectional area of needle used is _______________, and time to penetrate _____________ is used to measure initial setting time of cement.
1 mm², 33-35 mm
10 mm², 20-25 mm
1 mm², 0.5 mm
5 mm², 5 mm
Granite, after metamorphism transforms to
quartzite
slate
schist
gneiss
Which of the following properties ceramics do not possess?
Hardness
Brittleness
Elasticity at low temperature
Malleability
Vicat’s apparatus is used to determine the
Initial setting time of cement
Final setting time of cement
Normal consistency of cement
All of the above
The machine used to determine hardness of stone is called
Dorry’s testing machine
Deval testing machine
Brinell Hardness testing machine
Rockwell hardness test machine
White cement is white in colour due to
use of limestone and china clay free from metal oxides
its modified manufacturing process
specific chemical treatment given to ordinary cement
none of these
Workability of concrete is directly proportional to
Roughness of surface texture
Grading of the aggregate
Aggregate/cement ratio
Water/cement ratio
Which of the following statement(s) is/are true for Ferrock? i. It is a type of rock largely containing Iron ii. It is a carbon-negative environmentally-friendly compound iii. It is made by combining steel dust waste with silica iv. It is largely made up of recycled materials
Only (i)
(ii) and (iii)
(ii), (iii) and (iv)
(i), (ii), (iii) and (iv)
As per IS 456:2000, the minimum grade of concrete in reinforced concrete work is
M10
M15
M20
M25
Which of the following is a good fire-resistant stone?
Marble
Limestone
Compact sandstone
Granite
What causes bulking of sand?
Clay Content
Air Voids
Viscosity
Surface Moisture
If p is the standard consistency of cement, the amount of water used in conducting the initial setting time test on cement is
0.65 p
0.85 p
0.6 p
0.78 p
Following data is available in mix design, for batching in dry condition:
The inference made from above data is/are: (i) The quantity of coarse aggregate should be decreased by 26 kg. (ii) The quantity of fine aggregate should be increased by 2 kg. (iii) The quantity of mixing water per m³ should be increased by 28 kg.
