Self-leveling fluid mortar including calcium sulfate and lime

Details Self-leveling fluid mortar including calcium sulfate and lime Self-leveling fluid mortar including calcium sulfate and lime

1997-06-27

1999-06-08

Marcantoni, Paul

Compositions: coating or plastic

Coating or plastic compositions

Inorganic settable ingredient containing

106773, 106775, 106788, C04B 1106

Patent

active

059102152

DESCRIPTION:

BRIEF SUMMARY
The present invention relates to a self-levelling fluid mortar including calcium sulphate and lime and to compositions which can be employed for the preparation of the said mortar.
It also relates to combined uses, with the aim of influencing certain properties, of lime and either of a silica and of a compound containing alumina or of a pozzuolana in a self-levelling fluid mortar and/or in a screed obtained from a self-levelling fluid mortar.
Finally, it deals with a screed obtained from this self-levelling fluid mortar.
A self-levelling fluid mortar is the name given to a fluid mortar which is generally placed in position by pumping, which makes it possible to obtain, after application to or casting on a horizontal surface, a screed which is free from surface irregularity and perfectly horizontal without any mechanical treatment of the surface (such as especially a smoothing) following the casting of the said mortar.
Such mortars are very widely employed in the field of building, in particular to correct the unevennesses of the level of crude structural slabs or of horizontal surfaces of all kinds, on which finished coatings are subsequently placed, such as an adhesively bonded floor, a floor supported by timber joists, plastic slabs or carpeting.
Since the surface obtained must be strictly planar, a self-levelling fluid mortar is obviously preferable, especially because of its ease of application.
However, fluid mortars for a screed have in particular the disadvantage of being very sensitive to water and of having their mechanical strength markedly decreased when they are immersed in water or merely placed in contact with such an element.
In addition, it is important that the rate of setting of the mortar should be fast; on the one hand, in order that the screed may have high mechanical properties at an early age, that is to say within the initial hours following its preparation, which has the effect of reducing the risks of fissuring in the event of mechanical or thermal stresses; on the other hand, it should be rapidly possible to bring the screed into service.
The purpose of the invention is especially to propose self-levelling fluid mortars which do not exhibit the abovementioned disadvantage.
To this end, it has surprisingly been found by the Applicant Company that the combined use of lime and either of a silica and of a compound containing alumina, or of a pozzuolana, in a self-levelling fluid mortar additionally including calcium sulphate, granulates and water, makes it possible to reduce considerably the sensitivity to water, that is to say to increase considerably the resistance to water of a screed obtained from the said mortar, while providing it, preferably, with good mechanical strength (in air) in particular a very satisfactory flexural tensile strength (in air).
The screeds obtained exhibit, furthermore, the property of having a setting time which is very fast and adaptable to the methods of application which are employed.
Thus, one of the subject-matters of the invention consists of a self-levelling fluid mortar including calcium sulphate, granulates, lime, water and either at least one silica and at least one compound containing alumina or at least one amorphous pozzolan exhibiting surface defects, the weight content of the combination of silica + compound containing alumina or pozzuolana, relative to the weight of calcium sulphate, being between 2 and 10%, preferably between 3 and 7%.
Another subject-matter of the invention lies in the compositions which can be employed for the preparation of a self-levelling fluid mortar including calcium sulphate, granulates, lime, water, optionally granulates and either at least one silica and at least one compound containing alumina or at least one amorphous pozzolan exhibiting surface defects, the weight content of the combination of silica + compound containing alumina or pozzolan, relative to the weight of calcium sulphate, being between 2 and 10%, preferably between 3 and 7%.
The invention also consists of the use of both lime and either of at l

REFERENCES:
patent: 4188231 (1980-02-01), Valore
patent: 5366550 (1994-11-01), Schad
patent: 5424099 (1995-06-01), Stewart et al.
patent: 5556458 (1996-09-01), Brook et al.
patent: 5685903 (1997-11-01), Stav et al.

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