The Importance of Mixer Calibration

The Importance of Mixer Calibration
Technical Bulletin
Mixer Calibration
The Importance of Mixer Calibration
It is absolutely essential to know how the mixer must be configured so that it will
produce an accurate volume of concrete to specification. To configure your Reimer
concrete mixer, you need to go through a calibration process. Essentially, the
calibration process confirms all mixer settings for a particular mix design so that yield
and strength for the desired mix will be correct. There are different elements on a
mobile mixer that need to be calibrated with the materials that you will be mixing in
order to ensure accurate yield –
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Cement: weight/meter count (i.e. discharge rate)
Aggregate: gate setting
Sand: gate setting
Water: metered amount (W/C ratio)
Your mobile mixer needs to be calibrated based on the actual materials that you use
in your mix designs. Calibration ensures that the proper relationship between all
materials, and the yield of mixed concrete is correct. Once your machine is calibrated
you will record the mix settings and the calibration data for reference so that you will
produce a consistent quantity and concrete mix.
New Mixers
When you first purchase a mobile mixer, a Reimer representative will come to your
site to familiarize you with the machine and to assist you with the initial calibration. It
is important to calibrate the mixer using the materials that you will use to produce
concrete. If these materials change, for example a finer or coarser aggregate is used, it
could adversely affect your mix and yield. Therefore, the mixer will need to be
recalibrated.
After the initial calibration, it is recommended that you reconfirm the discharge rate
of the cement powder periodically. This will check that cement discharge continues to
be accurate. It is good practice to regularly confirm yield for each mix design; this can
be done by pouring an exact known volume and comparing it to your calibration
meter count.
Pre-Owned Mixers
You will need to recalibrate the mixer with the materials you will be using. Never use
the calibration or mix design information that may be stored in a used mixer. If you
need help with the initial calibration, call Support Services at Reimer Alliance.
Technical Bulletin
Mixer Calibration
Weighing Cement
When calibrating your mixer, be sure to use a scale that is accurate to 0.2 lbs – note: a
regular bathroom scale is not accurate enough. Reimer Alliance has a calibration kit
available for purchase. The kit includes:
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An accurate scale
Supporting straps
Calibration worksheets
Step-by-step calibration instructions
The kit can be purchased for C$ 1,200.00.
Producers concerned about quality and customer satisfaction make calibration a
priority within their operation. Calibration is essential to ensure delivery of accurate
volumes of quality concrete. Each mix design you use will need to be separately
calibrated — gate settings and cement counts will be different for every design.
For more information on calibrating your Reimer mobile mixer, refer to the Operator
Manual, or call Reimer’s Support Services.
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