Sand 0-2
kg
Sand 0-4
kg
Aggregate 8-16
kg
Cement
kg
Target W/C Ratio
Water required
Ltr.
Total dry weight
kg
Total wet weight
kg
Sand 0-2
%
Sand 0-4
%
Aggregate 8-16
%
Batch size
m3
Price Cement (t)
Batches / day
Sand 0-2
kg
kg
Sand 0-4
kg
kg
Aggregate 8-16
kg
kg
Cement
kg
kg
Total dry weight
kg
Total water in Aggr.
Ltr.
Water to be added
Ltr.
1. Too much water in the mixer although the WCR is correct
In theory litres of water should result in a batch moisture of %.
In reality the batch moisture results in % as the total dry weight is lower due to the water in the aggregates being weighed.
2. Waste of cement
In theory kg of cement should have been added on top of kg of aggregates.
In reality the full amount of kg cement will be added on top of kg.
This changes the cement/aggregate ratio from to .
The batch with exactly correct proportions of aggregates and cement could have been produced with a cement reduction of % which equals to kg per batch.