House and renovation
Cement for mining
It belongs to the group of CEM III cements (pozzolanic). In mining, cement can be used for concretes operating in the most difficult conditions. Therefore, the cement used for it must have high-quality properties, and above all, it must provide concrete with resistance to …
Cement for road construction
Cement for concrete intended for road and airport paving must have special properties due to the specific conditions of paving and their operation. It should show the lowest possible shrinkage, slow setting and hardening, limited fineness to …
Cement for building bridges
Difficult operating conditions for bridges and viaducts (cyclic freezing, Vibrations, defrosting salts, abrasion), require the use of sufficiently strong and resistant concrete for their construction, and therefore cement with special properties, e.g.: CEM III A i B.
Cement …
Low-calorie cement
It is characterized by a slow and low quantitative release of the heat of hydration. It is accompanied by a slow process of setting and hardening. Concrete made of this cement shows a very low tendency to swell during maturation and shrinkage during operation. It is obtained …
Belite cement
Belite cement is an example of a cement obtained with significantly reduced energy consumption than Portland cement (CEM I). It differs from Portland cement in a much slower hardening process, which is mainly due to the change in the amount of C3S in favor of C2S.
They are known …
Quick-setting Portland cement
These cements differ from quick-setting cements in that. They bind after from 3 do 30 minutes. Depending on the needs, the appropriate type of cement is selected. It is obtained by discontinuing the use of setting delaying admixtures, which …
What is the difference between the thinners for spreading with a brush and spraying?
Brush thinners consist of a mixture of solvents, which evaporate more slowly. Spray solvent blend evaporates faster. This is to guarantee the optimal performance properties of the material.
Please explain the term temperature …
Unsaturated polyesters and unsaturated polyester varnishes
Please present the composition of unsaturated polyester resin varnish
The main component of the varnish contains a styrene solution of unsaturated polyester resin and an accelerator. The main component of the paints also contains pigments. The hardener, on the other hand, contains peroxides.
Please describe …
What is the difference between dispersions and proper solutions?
While in the case of a proper solution, the dispersion of the binder in the solvent is molecular and below the size 0,0001 /im (0,0000001 mm), in the case of dispersion, the particles of the binder consist of many particles and …
From what raw materials are alkyd resins made?
Alkyd resins are made of dicarboxylic acids (generally phthalic acid is used), multivalent alcohols (usually a trivalent alcohol – glycerin) and fatty acids (e.g. from linseed oil).
What are modified alkyd resins?…