3. Rapid hardening cement
• Finer than opc provide
greater surface area for action
with water
• Gain strength early
• 1 day strength of this cement
is equal to 3 day srength of 43
grade cement
• Used where a rapid strength
devlopment is required
• Rapid strength gain is
accomplained by higher rate
of heat devlopment useful in
cold enviourment concereting
• Not suitable for hot
concereting
• Prefebricated structure
4. Low heat portland
• Less recative than
opc
• Initial setting time is
greater than opc
• Slow devlopment
• Used in mass
concereting:dam
• Slow devlopment of
strength less heat
5. Sulphate resisting cement
• Contain silicate
content is called
sulphate resisting
cement
• Expansion within
hardned structure of
cement paste result in
crack is called sulphate
attack
• Used marine
enviourment
7. Water proof cement
• Water proof
substance is added in
opc
• Calcium
sterate,aluminium
sterate,gypsum with
tannic acid
8. White portland cement
• Amount of iron oxide
governing greyiesh
colour is reduced
• Chalk,highly purified
lime stone as raw
material
• Finer than gray
cement
• Used to minimise
temperature effect
9. Coloured portland cement
• Pigment is added for
achiving different
colours
• 10% pigment is
added
• Permanent pigment
should be used so
that colour remains
for a long time
• For decoration
purpose
11. High alumina cement
• Very rective
• Very high early
strength
• 80% at 24 hours
• Resestive to chemical
attack
• Rise of temperature
12. Super phasphate cement
• Made by mixing 80-85%
well granulated slag with
20% sulphate
• Initial setting time 2.5-4
hours,final setting
time4.5 to 7 hours
• Heat of hydration is very
low
• Used in foundation
which is used in
aggressive condition
• Requires great care
when used in cold
weather
