CBV vs Weighing system
Unlike the Weighing System, the Concrete Batching Vehicle controls the PROCESS of dosing and mixing aggregates, cement, water and admixtures. It is equipped with sensors and an advanced electronic control unit that leads the operator to produce consistent and controlled batches of concrete. Quality concrete.
The traditional Weighing System, on the other hand, is nowadays mounted on many self loading concrete mixers and is only a ‘scale’ that helps to SIZE batches of concrete. Hence, it merely gives the misleading idea of controlling the quality of the concrete.
A traditional Weighing System, as a matter of fact:
- DOES NOT control the added water;
- DOES NOT manage the water contained as an aggregate’s moisture;
- DOES NOT control the Water/Cement ratio;
- DOES NOT allow you to use admixtures;
- DOES NOT control the mixing process;
- DOES NOT eliminate the operator’s mistakes.
WHICH ROLE DO THE AGGREGATES PLAY IN CONCRETE?
Aggregates are sand, gravel, etc. They do not participate to the chemical reactions inside the concrete, but as a “skeleton” of concrete they must comply with several requirements, basically in terms of mineralogical quality, grain size distribution and absence of impurities. They:
- provide strength and stiffness
- counteract the shrinkage of cement during hardening, avoiding cracking
- reduce the overall cost of the concrete
THE BINDING MATRIX
The water to cement (w/c) ratio is a basic parameter in concrete technology : it is the most important parameter to monitor during the batch in order to obtain the concrete with the expected properties.
Besides the max diameter limit of the aggregates, the specific concrete requirements set by the DESIGNER are the following:
They are all strictly related to the total WATER to CEMENT (and admixtures if present) ratio.