Course=Concrete technology strength compressive with days cement

Subject=Concrete technology strength compressive with days cement

For quality control of Portland cement, the test essentially done is

Optional Answers

(a) setting time

(b) Soundness

(c) tensile strength

(d) Consistency

(e) all the above

Sollution

(e) all the above

If 1500 g of water is required to have a cement paste 1875 g of normal consistency, the percentage of water is

Optional Answers

(a) 20%

(b) 25%

(c) 30%

(d) 35%

(e) 40%

Sollution

(b) 25%

Under normal conditions using an ordinary cement, the period of removal of the form work, is

Optional Answers

(a) 7 days for beam soffits

(b) 14 days for bottom slabs of spans 4.6 m and more

(c) 21 days for bottom beams over 6 m spans

(d) 2 days for vertical sides of columns

(e) all the above.

Sollution

(e) all the above.

Wp and Wf are the weights of a cylinder containing partially compacted and fully compacted concrete. If the compaction factor is 0.95, the workability of concrete is

Optional Answers

(a) extremely low

(b) very low

(c) low

(d) high

(e) none of these.

Sollution

(d) high

For given water content, workability decreases if the concrete aggregates contain an excess of

Optional Answers

(a) thin particles

(b) flat particles

(c) elongated particles

(d) flaky paticles

(e) all the above.

Sollution

(e) all the above.

After casting, an ordinary cement concrete on drying

Optional Answers

(a) expands

(b) mix

(c) shrinks

(d) none of these.

Sollution

(c) shrinks

To obtain cement dry powder, lime stones and shales or their slurry, is burnt in a rotary kiln at a temperature between

Optional Answers

(a) 1100° and 1200°C

(b) 1200° and 1300°C

(c) 1300° and 1400°C

(d) 1400° and 1500°C

(e) 1500° and 1600°C

Sollution

(d) 1400° and 1500°C

The standard sand now a days used in India, is obtained from

Optional Answers

(a) Jaipur (Rajasthan)

(b) Jullundur (Punjab)

(c) Hyderabad (Andhra Pradesh)

(d) Ennore (Madras)

(e) Cuttuck (Orissa)

Sollution

(d) Ennore (Madras)

Construction joints are provided

Optional Answers

(a) where B.M. and S.F. are small

(b) where the member is supported by other member

(c) at 18 m apart in huge structures

(d) in concrete wall at sill level of windows

(e) all the above.

Sollution

(e) all the above.

Curing a concrete for long period ensures better

Optional Answers

(a) volume stability

(b) strength

(c) water resistance

(d) water tightness and durability

(e) all the above.

Sollution

(e) all the above.

Construction joints are generally provided in concrete

Optional Answers

(a) roads

(b) retaining walls

(c) lining of canals

(d) lining of tunnels

(e) all the above.

Sollution

(e) all the above.

Shrinkage in concrete can be reduced by using

Optional Answers

(a) low water cement ratio

(b) less cement in the concrete

(c) proper concrete mix

(d) presaturated aggregates

(e) all the above.

Sollution

(e) all the above.

in limit state of design of RCC Structures the probability of failure is in %

Optional Answers

(a) 5

(b) 2

(c) 10

(d) 6

(e) none of these

Sollution

(e) none of these

as per IS 10262 1983, % of air content in concrete for 20mm aggregates

Optional Answers

(a) 1

(b) 3

(c) 4

(d) 8

(e) 2

Sollution

(e) 2

as per IS 10262 2009, % of air content in concrete for 20mm aggregates

Optional Answers

(a) 2

(b) 4

(c) 6

(d) 8

(e) none of these

Sollution

(e) none of these

14 days compression strength of PPC is

Optional Answers

(a) greater then OPC

(b) equal to OPC

(c) lower then OPC

(d) can not say anything

Sollution

(c) lower then OPC

28 days compression strength of PPC is

Optional Answers

(a) greater then OPC

(b) equal to OPC

(c) lower then OPC

(d) can not say anything

Sollution

(b) equal to OPC

90 days compression strength of PPC is

Optional Answers

(a) greater then OPC

(b) equal to OPC

(c) lower then OPC

(d) can not say anything

Sollution

(a) greater then OPC

the target strength of M45 grade of concrete

Optional Answers

(a) 53.25

(b) 51

(c) 45

(d) 55

(e) none of these

Sollution

(a) 53.25

size of cube use for comprehensive strength of cement in mm

Optional Answers

(a) 70.6

(b) 150

(c) 100

(d) 75

(e) 89

Sollution

(a) 70.6

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