Cement Video Lecture - NEET

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let's talk about cement cement is also a
critical thing we've used a day like the
house conception of house we use cement
and that is generally made from the
group to alkaline earth metals so as I
told it's important building material
and it was prepared first in England by
Joseph it's also come on Portland's
learn because it is the look and feel
looks similar to the national limestone
from the Portland is in England you can
cement as a product is obtained by
combining CEO and silica and oxides of
aluminum and Magnus's you combine all
these things you get good quality of
cement right so in average the cement
composition if you see you have calcium
oxide to 60% element silicon oxide if a
person then you have Evan amounts i5 10%
relation oxide fe2o3 all these things
combine to make a mixture which is got
cement for a good quality cinnamon the
ratio of silica to aluminium should be
2.5 - the ratio of the line the total
oxides of silicon iron and ammonium
should also be closed this is for the
good qualities in Vedic you see the
market their various quality of cement
some are good some are bad and all these
things depended on the ratio of silica
alumina and iron this kind of stuff so
we'll see how it to prepare cement so
the raw material used for cement
manufacture at the limestone in the
claim you have a raw material that is
used for decoration of cement and when
this lime student acclaim are heated
together they form cement linkers so
once I have its cement clinker is mixed
with three percent by weight this
example have 100 grams of clinker I'll
mix this bit to
gram three gram of gypsum right to form
semen right so the ingredient the
important ingredients between the
cements are dye calcium silicate tri
calcium silicon and tri calcium the
other important ingredients are pretty
soon we talked about the setting of
seven when you mix cement with water it
it takes some time and it converts into
hard mass and this is because the
hydration of molecules of the
constituents and its arrangement so the
moment a weak spot or something it
becomes hard mass and the reason maybe
you want to add gypsum is already you
slow down the process of settling of
cement so that it sufficiently get high
harden if you don't push gypsum it won't
become hard you want cement to become
very hard after some time you have to
add yourself the uses of cement cement
is used a lot right to build a nation to
build house next to iron and steel
cement is used without cement we can't
have flyovers we can't uproot roads we
can have buildings we cannot factorize
cement is very critical
right it is also used to bridge bridges
dams and buildings later
let's do a recap of the alkaline earth
metal we have done so if you see the
atomic number this is for beryllium
magnesium calcium Swanton you Miriam an
atom in this fashion
they're coming math also increase the
electronic application is NSS to write
the ionization enthalpy if you see it
decreases as we go down the Guru because
the size of the atom increases right and
then if you talk about the hydration
enthalpy that also decreases the radius
increases and we put on the group the
Buddha reduce the melting mind the
boiling point decreases because size
increases the melting point and boiling
point increases the density also has a
tip it will irregular pattern so we
can't actually remind density just by
the logic we have to actually have the
data
so what density do you see it decreases
decreases that it's on
and because she take this in something
in the lithosphere so in that case if
you see the magnesium and calcium has
good concentration others are not that
much let's take some examples now so the
question is what happens when magnesium
is bound in air the first one quick time
as he did in silica fluorine reacts with
slake lime and calcium nitrate just
heated the first one let's sick -
Simmons born in a magnesium be born with
air you get mg also magnesium reacts
with my protein in the air to form mg 3
and you can write a balanced reaction
here yeah this is my first one the
second part is quick lime is heated with
silica so I have quick lime co silica
sio2 when you heat this you get calcium
silicate casi this part is done but part
chlorine reacts with slickline so I have
slave line
I have Korean react to this I give COC
and - it's a bleaching Porter I get
water and I get it ca ca right so again
this balance this this part is a calcium
nitrate is heated so I have C a + 3 - I
hate this this give me calcium oxide
right like side so this is something you
have to remember this reaction these are
all available thank you
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