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BUILDING MATERIALS > cement > Flashcards

cement Flashcards

1
Q

ingredients of cement are burnt at

A

1400 degree celsius

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2
Q

% of pozzolanic material in pozzolona cement

A

30 %

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3
Q

snowcem is a

A

colored cement

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4
Q

limestone used for manufacture of cement

A

kankar

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5
Q

oxide lowest in opc

A

soda potash

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6
Q

sp gravity of opc

A

3.15

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7
Q

oxide highest in opc

A

calcium oxide

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8
Q 
color given by diff oxides
iron
magnesium
cobalt 
chloride
A

iron - red
magnesium - brown/black
cobalt - blue
chloride - green

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9
Q

finer the cement more will be the

A

strength, workability, shrinkage cracking

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10
Q

constituent used to accelerate setting time

A

calcium chloride

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11
Q

quick setting cement is produced by adding

A

aluminium sulphate/alum

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12
Q

rapid hardening cement is obtained by

A

grinding clinkers to a higher degree of fineness

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13
Q

flash set of opc paste is

A

premature hardening

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14
Q

rate of hydration

A

C4AF > C3A > C3S > C2S

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15
Q

C4AF % in cement

A

8 - 10%

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16
Q

role of superplasticizers in cement

A

removing air bubbles and retarding setting time

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17
Q

hydrophobic cement IS code

A

IS 8043:1991

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18
Q

oleic acid used in manufacture of

A

hydrophobic cement

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19
Q

which cement produces less heat

A

portland pozzolana cement

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20
Q

cement and water when poured in formwork takes how many days to acquire fixed properties

A

28 days

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21
Q

rate of hydration depends upon which test of cement

A

fineness

22
Q

addition of pozzolana in opc gives

A

decrease in early strength, redn in chemical action with sulphates, increasing shrinkage

23
Q

cement used in construction in sea water

A

portland pozzolona cement

24
Q

intial seeting time of quick setting cement

A

5 mins

25
Q

blast furnace slag CaO & silica %

A

45% CaO & 35 % silica

26
Q

which are fused together to form high alumina cement

A

bauxite and limestone

27
Q

high early strength cement are obtained as a result of

A

fine grinding, burning at high temperatures

28
Q

normal consistency of opc

A

25- 30%

29
Q

sp gravity of cement is found by which apparatus

A

le chatliers flask

30
Q

center needle of attachment of vicat apparatus projects circular edge by

A

0.5mm

31
Q

for road pavement cement generally used is

A

rapid hardening cement

32
Q

w/c ratio taken to find compr strength is

A

0.4

33
Q

maxm thickness of a concrete floor of cement warehouse

A

250mm

34
Q

ht of lechatlier split cylinder is

A

3m

35
Q

principal strength contributing bogue compound

A

calcium silicate

36
Q

steel content of ferro cemnt varies b/w

A

300 - 500 kg

37
Q

how much % of pigment in colored / white cement

A

5 - 10%

38
Q

For the construction of thin R.C.C. structures, the type of cement to be avoided, is

A

blast furnace slag cement

39
Q

names of white/colored cements are

A

colocrete, rainbow cement, silvercrete

40
Q

compared to opc high alumina cement has setting time

A

low intial setting time but higher final setting time

41
Q

curing period is minm for which cement

A

rapid hardening cement

42
Q

which cement is used to construct very hard thin surface

A

ferro cement

43
Q

properties of ferro cement are

A

impervious nature, no need of formwork, capacity to resist shock

44
Q

The cement whose strength is a little lower than the ordinary cement during the first three months but attains afterwards the same strength, is known as

A

Low-heat Portland cement

45
Q

how many volume a 50 kg cement bag

A

35 cm3

46
Q

batching tolerance for cement as per IS 456

A

+/- 2 %

47
Q

what do you mean by cement warehouse

A

pressure compaction of bags on lower layer

48
Q

addtn of pozzolana in cement results in

A

increased curing tym

49
Q

maxm heat of hydration

A

C3A > C3S >C4AF > C2S

50
Q

minm qty of cement needed in 1 m3 of rcc for sea weather time construction

A

350 kg

51
Q

steam curing is not done with which cement

A

rapid hardening cement

BUILDING MATERIALS (8 decks)

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