Download - Endaver
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Types of cement:
1. Ordinary portland based cement
2. non opc cement
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Ordinaray portland cement• Rapid hardening cement• Low heat portland
cement• Sulphate resisting
cement• Masonary cement• Water proof portland
cement• White portland cement• Coloured portland
cement
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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
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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
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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
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Masonary cement• Finely gridned• Produce
smooth ,plastic surface
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Water proof cement• Water proof
substance is added in opc• Calcium
sterate,aluminium sterate,gypsum with tannic acid
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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
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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
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Non portland based cement• High alumina cement• Super sulphate
cement
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High alumina cement• Very rective• Very high early
strength• 80% at 24 hours• Resestive to chemical
attack• Rise of temperature
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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