Hydronix Hydro-Control VI, Руководство оператора

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Optimisation Chapter 13
74 Hydro-Control VI Operators Guide HD0456 Rev 1.7.1
3 Consistency
A sensor measures moisture, not consistency.
Many factors affect consistency, but may not affect moisture content. These might include:
• Aggregate grading (coarse/fine ratio)
•
Aggregate/cement ratio
•
Admixture dosage dispersion
• Ambient temperature
• Water/cement ratio
•
Ingredient temperature
•
Colours
4 Calibration Based Water Addition
• When calibrating, omit the admixtures, metal fibres and plastic fibres.
•
When performing a calibration it is advised that both the dry and wet mix times are
extended to ensure that both are homogeneous.
•
A different calibration may be required for large variations in batch volume (e.g. half
batches).
•
Calibrate when conditions and ingredients are typical e.g. not first thing in the morning
when the aggregates are very wet, or when the cement is hot.
•
When using a calibration-based water addition method, it is essential to obtain a correct
dry reading.
•
Dry mix time must be long enough to obtain stability of the signal.
5 Mixing
• Minimum mix times are a function of the mix design (ingredients) not just the mixer.
•
Different mixes may require different mix times.
•
Keep batch sizes as consistent as possible e.g. 2.5m
3
+ 2.5m
3
+ 1.0m
3
is not as good as
3 x 2.0m
3
.
•
In CALC Mode, keep the dry mix time as long as possible to allow the required water to be
calculated correctly, to the detriment of the wet mix time if necessary.