cement

Question 1

ingredients of cement are burnt at

Answer 1

1400 degree celsius

Question 2

% of pozzolanic material in pozzolona cement

Answer 2

30 %

Question 3

snowcem is a

Answer 3

colored cement

Question 4

limestone used for manufacture of cement

Answer 4

kankar

Question 5

oxide lowest in opc

Answer 5

soda potash

Question 6

sp gravity of opc

Answer 6

3.15

Question 7

oxide highest in opc

Answer 7

calcium oxide

Question 8

color given by diff oxides
iron
magnesium
cobalt 
chloride

Answer 8

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

Question 9

finer the cement more will be the

Answer 9

strength, workability, shrinkage cracking

Question 10

constituent used to accelerate setting time

Answer 10

calcium chloride

Question 11

quick setting cement is produced by adding

Answer 11

aluminium sulphate/alum

Question 12

rapid hardening cement is obtained by

Answer 12

grinding clinkers to a higher degree of fineness

Question 13

flash set of opc paste is

Answer 13

premature hardening

Question 14

rate of hydration

Answer 14

C4AF > C3A > C3S > C2S

Question 15

C4AF % in cement

Answer 15

8 - 10%

Question 16

role of superplasticizers in cement

Answer 16

removing air bubbles and retarding setting time

Question 17

hydrophobic cement IS code

Answer 17

IS 8043:1991

Question 18

oleic acid used in manufacture of

Answer 18

hydrophobic cement

Question 19

which cement produces less heat

Answer 19

portland pozzolana cement

Question 20

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

Answer 20

28 days

Question 21

rate of hydration depends upon which test of cement

Answer 21

fineness

Question 22

addition of pozzolana in opc gives

Answer 22

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

Question 23

cement used in construction in sea water

Answer 23

portland pozzolona cement

Question 24

intial seeting time of quick setting cement

Answer 24

5 mins

Question 25

blast furnace slag CaO & silica %

Answer 25

45% CaO & 35 % silica

Question 26

which are fused together to form high alumina cement

Answer 26

bauxite and limestone

Question 27

high early strength cement are obtained as a result of

Answer 27

fine grinding, burning at high temperatures

Question 28

normal consistency of opc

Answer 28

25- 30%

Question 29

sp gravity of cement is found by which apparatus

Answer 29

le chatliers flask

Question 30

center needle of attachment of vicat apparatus projects circular edge by

Answer 30

0.5mm

Question 31

for road pavement cement generally used is

Answer 31

rapid hardening cement

Question 32

w/c ratio taken to find compr strength is

Answer 32

0.4

Question 33

maxm thickness of a concrete floor of cement warehouse

Answer 33

250mm

Question 34

ht of lechatlier split cylinder is

Answer 34

3m

Question 35

principal strength contributing bogue compound

Answer 35

calcium silicate

Question 36

steel content of ferro cemnt varies b/w

Answer 36

300 - 500 kg

Question 37

how much % of pigment in colored / white cement

Answer 37

5 - 10%

Question 38

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

Answer 38

blast furnace slag cement

Question 39

names of white/colored cements are

Answer 39

colocrete, rainbow cement, silvercrete

Question 40

compared to opc high alumina cement has setting time

Answer 40

low intial setting time but higher final setting time

Question 41

curing period is minm for which cement

Answer 41

rapid hardening cement

Question 42

which cement is used to construct very hard thin surface

Answer 42

ferro cement

Question 43

properties of ferro cement are

Answer 43

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

Question 44

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

Answer 44

Low-heat Portland cement

Question 45

how many volume a 50 kg cement bag

Answer 45

35 cm3

Question 46

batching tolerance for cement as per IS 456

Answer 46

+/- 2 %

Question 47

what do you mean by cement warehouse

Answer 47

pressure compaction of bags on lower layer

Question 48

addtn of pozzolana in cement results in

Answer 48

increased curing tym

Question 49

maxm heat of hydration

Answer 49

C3A > C3S >C4AF > C2S

Question 50

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

Answer 50

350 kg

Question 51

steam curing is not done with which cement

Answer 51

rapid hardening cement