Classifications

• • C—CHEMISTRY; METALLURGY
  • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
  • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
  • C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
  • C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
• • C—CHEMISTRY; METALLURGY
  • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
  • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
  • C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
  • C04B41/009—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone characterised by the material treated
• • C—CHEMISTRY; METALLURGY
  • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
  • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
  • C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
  • C04B41/45—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements
  • C04B41/50—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with inorganic materials
  • C04B41/5007—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with inorganic materials with salts or salty compositions, e.g. for salt glazing
  • C04B41/5015—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with inorganic materials with salts or salty compositions, e.g. for salt glazing containing phosphorus in the anion, e.g. phosphates
• • C—CHEMISTRY; METALLURGY
  • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
  • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
  • C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
  • C04B41/60—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone of only artificial stone
  • C04B41/61—Coating or impregnation
  • C04B41/65—Coating or impregnation with inorganic materials
  • C04B41/67—Phosphates
• • C—CHEMISTRY; METALLURGY
  • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
  • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
  • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
  • C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
  • C04B2111/00482—Coating or impregnation materials
  • C04B2111/00491—Primers

Definitions

• the present invention relates to rendering mortars having improved adhesion to concrete surfaces, primers and the use of monofluorophosphates to improve the adhesion of cementitious plasters to concrete surfaces.
• Plasters can basically be subdivided into cement-bound plasters and gypsum plasters.
• gypsum plaster there are major problems, especially on concrete surfaces, since gypsum and concrete react differently during drying or changing temperatures.
• gypsum plaster when applying gypsum plaster on relatively fresh concrete must be expected to flake off the gypsum plaster, since concrete shrinks when drying, gypsum not. For this reason cement-based plaster is recommended especially for fresh concrete surfaces.
• cement-bound plaster mortars do not always adhere satisfactorily to concrete surfaces, especially in precast concrete parts. It has therefore already been proposed to use plate dowels for better connection of the plaster with the concrete surface.
• Primer primers predominantly contain quartz sand in a plastic-based binder. These primers are applied to the concrete surface, creating a rough surface on which the plaster can adhere better.
• plastic-based primers require a certain minimum processing temperature and a longer drying time to actually give a stable load-bearing surface.
• the object of the present invention was accordingly to provide a plaster or a primer that give a secure adhesion to concrete surfaces.
• the present invention provides a plaster of mortar containing a monofluorophosphate.
• an adhesion primer containing a monofluorophosphate is provided.
• rendering mortars are to be understood as meaning mixtures which comprise at least one hydraulically curing binder and an additive.
• Suitable hydraulically curing binders are cement, lime, mixtures thereof and gypsum.
• Particularly preferred are cement-bound plaster mortars in which cement, such as Portland cement, slag cement, trass cement, etc., which form hydraulic binder, and lime cement plasters.
• the aggregate is usually sand.
• the sand typically has a predominant grain fraction between 0.25 and 4mm, depending on the type of plaster.
• the maximum thickness is typically 0.5 to 1 mm, for brushes thicker, 8 to 10 mm.
• Other materials, such as plastic granules, expanded minerals, etc. may alternatively or additionally be included as an additive depending on the type of plaster. in light plaster or clear plaster.
• the plaster may contain per se known additives and admixtures, such as e.g. Air entraining agents, solidification accelerators, setting retarders and dyes.
• the plaster mortar is a dry mix which must still be dressed with water.
• the monofluorophosphates used according to the invention for improving the adhesion and their preparation are known per se.
• Monofluorophosphates and in particular sodium monofluorophosphate have hitherto been used, inter alia, as wood preservatives (US 4,824,484), as corrosion inhibitors (US 4,608,092, US 4,613,450 and US 5,071,579) and for reducing the flaking of concrete (DE 692 05 968).
• Their use as an accelerator for concrete is also known.
• monofluorophosphates preferably alkali metal and alkaline earth monofluorophosphates and in particular sodium, potassium, magnesium are suitable. and / or calcium monofluorophosphate. Very particular preference is given to sodium and / or potassium monofluorophosphate.
• the monofluorophosphate in an amount of 0.05 to 5 wt .-%, preferably 0.05 to 1 wt .-% and in particular 0.1 to 0.5 wt .-% based on the binder of the plaster added to this.
• a particular advantage of this embodiment is that no pre-treatment or other additional steps on the site are required, the dosage can be done accurately and precisely already in the production of the plaster in the factory.
• a, preferably aqueous solution with a proportion of 1 to 30 wt .-%, preferably 5 to 30 wt .-% and in particular 10 to 25 wt .-% monofluorophosphate used as a primer is used as a primer.
• the upper limit results here from the solubility of the monofluorophosphate, wherein the primer should be a stable solution, which should show no precipitation of monofluorophosphate even when cooled to, for example, 5 0 C.
• the lower limit results from the amount to be applied in each case. Depending on the method of application, this can be determined by the person skilled in the art in such a way that preferably the desired amount of monofluorophosphate can be applied once or twice.
• the application of the adhesion primer according to the invention should take place in amounts of 1 to 100 g / m 2 , preferably 10 to 80 g / m 2 and in particular 20 to 50 g / m 2 .
• the adhesion primer according to the invention can be applied in a manner known per se, for example by brushing, rolling, spraying or dipping.
• the job can be done in one or more steps, which should preferably be between two applications a drying in two or more applications.
• adhesion primer according to the invention can be provided with further ingredients, such as fungicides, dyes, etc., so that additional effects can be achieved by the order.
• Plate 5 was prepared as a comparison without monofluorophosphate.
• steel reinforcement was incorporated into the plates so that part of the steel protruded from the surface to investigate the influence of exposed steel reinforcements.
• 5 plates were prepared, plates 6 and 7 analogous to plates 1 and 2, plates 8 and 9 analogous to plates 3 and 4, and plate 10 analogous to plate 5.
• a lime cement adhesive fine plaster CS III according to DIN EN 998-1 (KHF TM, Schwenk Putztechnik GmbH & Co. KG, DE) is optionally mixed with sodium monofluorophosphate, prepared according to instructions and with a thickness of 0.7 cm with a trowel on the , if necessary, applied with an aqueous solution of sodium monofluorophosphate coated test plates.
• the composite is assessed visually by scanning electron micrographs (SEM) of the boundary layers.
• the sample plates were sawn into approximately 10 mm thick strips using a rock saw. These were dried at 40 ° C. to equilibrium moisture content and divided by means of a rock press so that the bond between concrete and plaster became visible at the fracture surface. The samples were then glued with "Carbon Cement" to bell on sample holder and made the surface electrically conductive by sputtering with gold.
• a Sputtercoater type SCD 005 was used by BAL-TEC, the working distance was 50 mm, the vacuum 5x10 '2 mbar in argon atmosphere, sputtering current 60 mA, time 60 s.
• FIGS. 1 to 4. There are three magnification levels each.
• Figure 1 shows the bond between a plaster with 0.1% sodium monofluorophosphate (based on the binder) and the concrete surface.
• the monofluorophosphate forms a porous lime sintering layer between the concrete and the plaster, which has a positive influence on the adhesion.
• FIG. 2 shows the composite between an unmodified plaster and a concrete surface treated once with sodium monofluorophosphate, application rate 18.5 g / m 2 .
• the hydration of the plaster in the composite zone is improved, the lime sintering layer on the concrete surface is thin and porous.
• FIG. 3 shows the bond between an unmodified plaster and a concrete surface treated twice with sodium monofluorophosphate, total application amount 34.5 g / m 2 .
• the hydration of the plaster is further improved, a further compression is achieved.
• the meshing of plaster and concrete has already gone so far that a point had to be found for the SEM image where the transition is still visible.
• FIG. 4 for comparison, the bond between an unmodified plaster and an untreated concrete surface is shown. It can be seen that there is a sharp border, the cement paste of the concrete is very dense, as well as the hardly recognizable calcine sintering layer.
• Example 2 sample plates were prepared and coated with plaster. The liability was recorded by means of adhesion tests. For this purpose, the test plates were stored for 14 or 28 days in plastic film. Analogously to Example 2, 0.1% sodium monofluorophosphate was incorporated into the plaster or 18.5 or 34.5 g / m 2 sodium monofluorophosphate was applied to the surface by treating it once or twice.

Applications Claiming Priority (2)

Publications (1)

Family

ID=37461008

Family Applications (1)

Country Status (5)

Families Citing this family (2)

Family Cites Families (15)

• 2005
  • 2005-11-05 DE DE102005052791.4A patent/DE102005052791B4/de active Active
• 2006
  • 2006-10-28 WO PCT/EP2006/010386 patent/WO2007051569A1/de active Application Filing
  • 2006-10-28 JP JP2008539295A patent/JP5300483B2/ja not_active Expired - Fee Related
  • 2006-10-28 EP EP06806593A patent/EP1945594A1/de not_active Ceased
  • 2006-10-28 US US12/092,473 patent/US20080264293A1/en not_active Abandoned
• 2013
  • 2013-03-04 JP JP2013041467A patent/JP5755270B2/ja active Active

Non-Patent Citations (1)

Also Published As

Similar Documents

Legal Events