Coating processes – With post-treatment of coating or coating material
Patent
1996-12-06
1999-07-20
Green, Anthony
Coating processes
With post-treatment of coating or coating material
106638, 106640, 106819, 4273722, 4273831, 427384, 4273855, 427421, 427428, B05D 300, C04B 4004
Patent
active
059254165
DESCRIPTION:
BRIEF SUMMARY
The invention relates to the use of colloid solutions of non-metals or metals, their oxides, hydroxides, oxihydrates and/or polymers (such as, e.g., heteropolyacids) for reducing the susceptibility to fissuring during the curing of non-cured binder suspensions (such as, e.g., unset concrete, ready mix) and for after treatment of cured binder suspensions (such as, e.g., concrete).
PRIOR ART
Binder systems prepared with water or other solvents are subjected to hydration and dehydration procedures during their first phase of curing that are difficult to control. Temperature fluctuations occurring during that period of time, like the structural transformations taking place during hydration, result in mechanical stresses,-wherein undesired volume changes/shrinking procedures frequently lead to the formation of fissures, separation or segregation phenomena and in the following bring about negative changes in the mechanical properties of the cured products.
In building practice it has, for instance, been known to limit evaporation losses and surface vicinity drying of unset concrete surfaces by feeding water. In addition to spraying water on unset concrete surfaces, it was, for instance, also proposed to apply organic solvents (e.g., glycols) or mineral or vegetable oils in order to form kind of a vapor barrier thereby preventing the uncontrolled evaporation of water. Such surface treatments suffer the disadvantage that the surface will be subjected to permanent changes (e.g., loss of strength) and, as a consequence, will frequently exhibit what is called an antiadhesive effect. The antiadhesive effect makes rendering difficult the application of further coatings and prevents permanent i bonding with consecutive layers or coatings.
SUMMARY OF THE INVENTION
The invention aims at a better control of the initial phase of the setting procedure and at ensuring success in subsequent surface treatments of cured or solidified binder suspensions (e.g. concrete). To solve this object, the invention proposes the use of the initially mentioned kind, wherein an accordingly dense and evaporation-preventing coating is provided due to the fact that gels are formed of the above-mentioned colloid solutions by appropriate additions or by the free Ca(OH)2 of the concrete or also on account of the limited temporal stability of colloid. In the case of cured binder suspensions (e.g. concrete), restoration of formed microfissures is observed at such gel precipitations such that the permeability and mechanical stability of the surface will be substantially improved. By the fact that colloid solutions based on non-metals or metals, their oxides, hydroxides or oxyhydrates and/or polymers are used, an inorganic permanent surface layer is formed, which, as a consequence, cannot be thermally destroyed and, depending on the choice of the respective non-metals or metals, at the same time combines the mechanical improvement of the surfaces with the advantage that further -layers applied thereon can safely be connected with subjacent layers without development of an antiadhesion effect.
DETAILED DESCRIPTION OF A PREFERRED EMBODIMENT OF THE INVENTION
According to a preferred use, the colloid solutions are applied, in particular sprayed or rolled, on the surfaces of binder suspensions.
Suitable stabilization of the colloid solutions may be effected in order to adjust the desired time period until the formation of gels occurs, the use in that case advantageously being effected in a manner that the colloid solution employs mineral or biologically degradable additions. Stabilization in that case serves to control the point of time of gel formation in as precise a manner as possible by controlling gel formation by the addition of colloid stabilizing agents or agents favoring gel formation, wherein the desired effect of the colloid solutions is controlled by concertedly initiating or retarding gel formation. On the whole, known after treatment processes of unset binder surfaces (such as, for instance, applying wet cloths, foils or spraying wate
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Akstinat Manfred
Suter Willi
Green Anthony
Holderchem Holding AG
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