Concrete mixers are devices that uniformly mix the ingredients of concrete to form fresh concrete. There are four main types of concrete mixers: twin shaft mixers, which provide high intensity mixing for small batches; vertical axis mixers, commonly used for colored concrete and small batches; drum mixers, used for large volumes and production speed; and in-transit mixers, which mix concrete during transport to maintain its liquid state until delivery. Concrete mixers consist mainly of a drum to hold and mix the materials, rollers and a motor to turn the drum, internal blades to mix and discharge the concrete homogenously, and a gearbox to control the drum's rotational speed.

1. Concrete mixers
Presented by Muhammad bilal
CED, UET Peshawar

2. Introduction
A device that mixes the ingredients of concrete
to form fresh concrete. This mixing should must
be Uniform to preserve the quality and working
of concrete.
The concrete mixer was invented by United
States industrialist Gebhardt Jaeger.

4. Types of Concrete mixers
THERE ARE 4 TYPES OF CONCRETE MIXER
MAINLY USED IN ENGINEERING WORKS
• TWIN SHAFT MIXER
• VERTICAL AXIS MIXER
• DRUM MIXER
• IN-TRANSIT MIXER

5. 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

6. Vertical axes mixer
VERTICAL AXIS MIXERS
ARE MOST
COMMONLY USED
FOR THE PRODUCTION
OF COLOURED
CONCRETE AND
SMALLER BATCHES OF
O.98 – 3.9 CUBIC
YARDS

7. Drum mixer
• DRUM MIXERS 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.
• DRUM MIXERS ARE KNOWN TO
HAVE THE LOWEST MAINTANCE AND
OPERATING COST

8. Tilting drum mixer Non-tilting drum mixer
TYPES OF DRUM MIXER

9. IN-TRANSIT MIXER

10. • 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
• WITH THIS PROCESS , THE MATERIALS HAS ALREADY
BEEN MIXING.
• IT MAINTAIN THE MATERIAL’S LIQUID STATE
THROUGH TURNING OF THE DRUM UNTIL DELIVERY
IN-TRANSIT MIXER

11. • 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
• WHEN THE DRUM REVERSE ITS ROTATIONAL
DIRECTION THE SREW TYPE ARRENGEMENT OF THE
BLADE FORCES THE CONCRETE OUT OF THE DRUM
• THE ROTATION SPEED IS GENERALLY 20-36 ROUNDS
PER MINUTE

12. Parts of concrete mixers
• Drum ( it is used to mix the components)
• Rollers ( it rolls the drum)
• Motor ( it operates the rollers)
• Blades (it is used to mix the ingredients
homogeneously and discharge it)
• Gearbox ( it is used to control the rotational speed of
drum)