3. CONCRETE MIXER
A CONCRETE MIXER IS A DEVICE
THAT HOMOGENEOUSLY COMBINE
CEMENT, AGGREGATE(SAND &
GRAVAL) AND WATER TO FORM
CONCRETE
4. CONCRETE MIXER
A TYPICAL CONCRETE MIXER USES A
REVOLVING DRUM TO MIX THE
COMPONENTS.
FOR SMALLER VOLUME WORKS
PORTABLE CONCRETE MIXERS ARE
OFTENLY USED.
8. TWIN SHAFT MIXER
TWIN SHAFT MIXERS ARE KNOWN
FOR THIER HIGH INTENSITY MIXING IN
SHORT PERIOD OF TIME.
THESE MIXERS ARE TYPICALLY USED
FOR HIGH STRENGTH CONCRETE IN
BATCHES OF 2.6 – 7.8 CUBIC YARDS.
10. VERTICAL AXIS MIXER
VERTICAL AXIS MIXERS ARE MOST
COMMONLY USED FOR THE
PRODUCTION OF COLOURED
CONCRETE AND SMALLER BATCHES
OF O.98 – 3.9 CUBIC YARDS
12. DRUM MIXER
DRUM MIERS ARE USED WHERE LARGE
VOLUME OF CONCRETE IS BEING
PRODUCED.
THE BATCHE SIZE IS RANGING FROM 3.9 –
12 CUBIC YARDS.
THIS TYPE OF MIXERS DOMINATE THE
READY MIXED MARKET AS IT IS KNOWN TO
BE CAPABLE OF HIGH PRODUCTION SPEED,
IDEAL FOR SLUMP CONCRETE AND WHERE
OVERALL COST OF PRODUCTION IS
IMPORTANT.
13. DRUM MIXER
DRUM MIXERS ARE KNOWN TO HAVE
THE LOWEST MAINTANCE AND
OPERATING COST.ALL THE THREE
TYPES OF MIXERS ARE USED TO
VARYING DEGREE IN ALL PARTS OF
THE WORLD.
14. TYPES OF DRUM MIXER
DRUM MIXERS ARE BROADLY
CLASSIFIED INTO TWO MAIN
CATAGORIES:-
(1) TILTING DRUM MIXER
(2) NON-TILTING DRUM MIXER
16. TILTING DRUM MIXER
THESE TYPES OF MIXERS ARE
GENERALLY USED FOR MINI
PROJECTS.
THEY HAVE A LEVER OR HANDLE
WITH THE HELP OF WHICH THE
FRESHLY MIXED CONCRETE IS
DISCHARGED OR TIPPED INTO A
WHEELBARROW
18. NON-TILTING DRUM MIXER
THESE MIXERS DONOT TILT.
IN THIS TYPE OF DRUM MIXERS THE
BLADES INSIDE THE DRUM ARE
DESIGNED SO THAT ON REVERSING
THE ROTATION THE CONCRETE IS
DISCHARGED FROM THE DRUM.
HENCE THEY ARE ALSO KNOWN AS
REVERSING DRUM MIXERS.
19. TYPES OF DRUM MIXER
DOUBLE DRUM AND TRIPLE DRUM
MIXERS ARE ALSO USED
THEY REDUCE THE LABOUR COST
WHERE AS THE PRODUCTIVITY IS NOT
AFFECTED.
21. CONCRETE TRANSPORTIN
TRUCK
IT IS ALSO KNOWN AS IN-TRANSIT
MIXER
THEY ARE MADE TO TRANSPORT AND
MIX CONCRETE UP TO THE
CONSTRUCTION SITE
THEY CAN BE CHARGED WITH DRY
MATERIALS AND WATER, WITH MIXING
OCCURING DURING TRANSPORT
22. IN-TRANSIT MIXER
WITH THIS PROCESS , THE
MATERIALS HAS ALREADY BEEN
MIXING.
IT MAINTAIN THE MATERIAL’S LIQUID
STATE THROUGH TURNING OF THE
DRUM UNTIL DELIVERY
23. IN-TRANSIT MIXER
THE INTERIOR OF THE DRUM IS
FITTED WITH A SPIRAL BLADE.
IN ONE ROTATIONAL DIRECTION THE
CONCRETE IS PUSHED INTO THE
DRUM
THIS IS KNOWN AS CHARGING THE
MIXER
24. IN-TRANSIT MIXER
WHEN THE DRUM REVERSE ITS
ROTATIONAL DIRECTION THE SREW
TYPE ARRENGEMENT OF THE BLADE
FORCES THE CONCRETE OUT OF THE
DRUM
25. WORKING OF MIXER
THE REVOLVING DRUM IS USED TO
MIX ALL THE COMPONENTS OF
CONCRETE
THE DRUM IS ATTACHED WITH
USUALLY TWO ROLLARS WHICH ARE
OPERATED BY A MOTOR
WATER, CEMENT AND AGGREGATES
ARE PUT INSIDE THE REVOLVING
DRUM IN A DESIRED PROPORTION
26. WORKING OF MIXER
FOR EXAMPLE IF YOU WANT HIGH
STRENGTH CONCRETE, THEN USE
1:2:4 RATIO OF CEMENT, SAND AND
GRAVAL RESPECTIVELLY
WATER IS THEN ADDED ACCORDING
TO THE CEMENT AMOUNT, TO CARRY
OUT THE HYDRATION PROCESS OF
CEMENT
27. WORKING OF MIXER
THE WATER/CEMENT RATIO IS
GENERALLY 0.5 BUT CAN BE
REDUCED TO 0.25
WHEN THE DRUM ROTATES IT MIX ALL
THE COMPONENTS HOMOGENOUSLY
THE ROTATION SPEED IS GENERALLY
20-36 ROUNDS PER MINUTE
28. WORKING OF MIXER
AFTER 1 OR 2 MINUTES THE
CONCRETE IS DISCHARGED INTO A
CHUTE
A CHUTE IS A CONTAINER THAT GUID
THE CONCRETE TO A WHEELBARROW
29. WORKING OF MIXER
AFTER THIS PROCESS THE DRUM IS
THEN WASHED WELL SO THAT THE
CEMENT MAY NOT STICK TO IT
