AAKAHSH SK
XI-PCM
INDEX
1. CERTIFICATE OF EXCELLENCE
2. ACKNOWLEDGEMENT
3. AIM OF PROJECT
4. INTRODUCTION
5. THEORY
6. APPARATUS REQUIRED
7. PROCEDURE FOLLOWED
8. OBSERVATION
9. CONCLUSION
10. PRECAUTION
11. BIBLIOGRAPHY
AIM OF THE
EXPERIMENT
To study the setting of mixture of cement with
sand, time and fly ash with respect to time and
strength.
INTRODUCTION
In the most general sense of the word, CEMENT is a
binder, a substance that sets and hardens
independently, and can bind other materials
together. The word “ cement “ traces to the Romans,
who used the term opus caementicium to describe
masonry resembling modern concrete that was
made from crushed rock with burnt lime as binder.
The volcanic ash and a pulverized brick additive
that were added to the burnt lime to obtain a
hydraulic binder were later referred to as cementum,
cimentum, cament and cement.
The most important use of cement is the production
of mortar and concrete
The bonding of natural or artificial aggregates to
form a strong building material that is durable in
the face of normal environment effects.
Portland
cement
Cement is made by heating limestone (calcium
cabonate), with small quantities of other materials (such
as clay) to 1450ͦC in a kiln, in aprocess known as
calcination, whereby a molecule of carbon dioxide is
liberated from the calcium carbonate to form calcium
oxide,or quicklime,which is then blended with the other
materials that have been included ih the mix. The
resulting hard substance, called ‘clinker’, is then
ground with a small amount of gypsum into a powder to
make ‘Ordinary Portland Cement’, the most commonly
used type of cement(often referred to as OPC).Portland
cement is a basic ingredient of concrete, mortar and non
speciality grout. The most common use for portland
cement is in the production of concrete. Concrete is a
composite material consisting of aggregate (gravel and
sand), cement and water. As a construction material,
concrete can be cast in almost any shape desired and
once hardened, can become a structural (load baering)
element. Portland cement may be gray or white.
Construction of buildings using cement
Cement used in construction is characterised as
hydraulic or non-hydraulic. Hydraulic cements
(eg. Portland cement) harden because of hydration
chemical reactions that occurs independently
Of the mixture’s water content; they can harden
even underwater or when constantly exposed to wet
weather. The chemical reaction that results when the
anhydrous cement powder is mixed with water
produces hydrates that are not water-soluble. Non-
hydraulic cements (eg. Lime and gypsum plaster)
must be kept dry in order to retain their strength.
EFFECT OF QUALITY OF SAND ON
SETTING OF CEMENT MORTAR
Sand obtained from different sources has different
qualities. For example, Sea sand obtained from sea
contains unwanted salts and retards setting of cement
and is not suitable for making mortar.
On the other hand, Pit sand is obtained from pits in the
soil and the River sand obtained from riverbed is
considered excellent for preparing mortar and concrete.
EFFECT OF TIME ON SETTING OF
CEMENT MORTAR
Time has an important role on strength of developed
cement mortar. When a cement paste in the ratio 1:3 in
water is allowed to dry, the strength of solid mass keeps
on increasing with increase in time given for setting. It
acquires a nearly full strength in 28 days.
APPARATUS REQUIRED
1. Beakers, glass rods, weight box, matchboxes
BEAKER GLASS RODS WEIGHT
MATCHBOX BEAKERS
2. Limestone, river sand, cement and fly ash
LIMESTONE RIVER SAND
CEMENT FLY ASH
PROCEDURE
1. Prepare mixtures of various compositions as given in
Observation table.
2. Take each of the given mixtures in different beakers
and prepare their pastes by adding minimum amount of
water
3. Take nine cases of empty match boxes and mark them
from 1 to 9.
4. Fill the three cases with the paste of each composition.
5. Spray water from time to time over the paste ,so that
they remain moist all the time.
6. After three days, take out one slab of each composition
and test their strengths.
7. Similarly, take out a set of three slabs after 7 days
after 30 days respectively and test their strengths
OBSERVATION
SL. COMPOSITION OF MIXTURE MINIMUM WEIGHT TO BREAK
NO. AND RATIO THE SLAB AFTER
3 DAYS 7 DAYS 10 DAYS
1 CEMENT:RIVER SAND(1:3) 18 GRAM 20 GRAM 30 GRAM
2 CEMENT:RIVER SAND:FLY ASH 16 GRAM 18 GRAM 26 GRAM
(2:9:1)
3 CEMENT:RIVER SAND:LIME 10 GRAM 15 GRAM 20 GRAM
(1:3:1)
By seeing the observation we can estimate the hardness
of the slab.
CONCLUSION
The strength of the slab increases with the
increase in setting time allowed.
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Handle the glass wares safely.
Allow the time required to set.
Spray only required amount of
water.
BIBLIOGRAPHY
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