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The cement industry generally talks
in terms of product quantities in the range of several thousand
tonnes per day, but in the case of speciality products, smaller
batches can also be very cost-effective. Even small amounts
of high-performance binders, for example, bring an excellent
contribution margin compared with standard products such as
Portland cement.
Ideal for the manufacture of these high-performance binders
are Hosokawa Alpine's ultrafine classifiers. These classifiers
operate in the range of approx. 2-3 tph and produce end-product
finenesses with a d
value of 11-15 µm or a d
value of 7-8 µm.
High-performance binders are characterised by a special size
distribution, which when combined with the processing at a lower
ratio of water to binder, permits the formation of an extremely
dense and thus extremely strong structure. High-performance
binders are manufactured by the targeted addition of ultrafine
cement to standard cements. These ultrafine cements are the
result of post-classifying standard products with ALPINE
Turboplex classifiers such as the 315/3 ATP.
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Model representation of
high-performance concrete
1 = standard cement
2 = aggregate
3 = ultrafine cement
4 = water |
Because of the small particle size, such suspensions have an
excellent penetration capacity, meaning that pores, defective
spots and cracks in the building and also in the foundation
soil that cannot be reached with conventional cements can be
sealed and stabilised reliably. This leads to application possibilities
in the following fields:
- precast elements industry
- ready-mixed concrete for building construction
- geotechnology
- preservation of historic structures
The flowchart shows a typical configuration of the classifying
system. Two products, e.g. granulated blast-furnace slag and
cement clinker, are fed to the classifier either as a mixture
or separately by means of a pneumatic feeder. The multi-wheel
classifier separates the ultrafine product and discharges it
via an automatic filter.
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Legend
1 = Flat-body slide valve
2 = Double rotary valve
3 = Slide valve
4 = Flowmeter
5 = Rotary valve
6 = Butterfly valve
7 = Ball valve
8 = Pneumatic feeder
9 = Flap valve
10 = Silencer
11 = Turboplex Mulit-Wheel Classifier ATP-GS
12 = Automatic reverse jet filter
13 = Fan
14 = Control cabinet
A = Product feed - granulated
blast-furnace slag
B = Product feed - cement clinker
C = Coarse
D = Fines (end product)
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Wear-resistant materials are used to protect the system against
wear. The classifying wheels of Turboplex classifiers, for example,
are made completely of aluminium oxide, whereas all other product-contact
machine components are lined with aluminium oxide. The ductings
and filter are also appropriately protected.
In spite of the integrated wear protection, the classifier including
accessories is extremely easy to maintain. The classifying wheels,
for example, can be pulled out of the classifier housing on
assembly slides to permit wear control procedures or their exchange.
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