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
  • C04B28/04—Portland cements
• • 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
  • C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
  • C04B40/06—Inhibiting the setting, e.g. mortars of the deferred action type containing water in breakable containers ; Inhibiting the action of active ingredients
  • C04B40/0641—Mechanical separation of ingredients, e.g. accelerator in breakable microcapsules
  • C04B40/065—Two or more component mortars

Definitions

• the present invention described relates to two-component binders with optimum processability over wide range limits; these binders are based on a liquid and a solid component which are to be mixed homogeneously shortly before the application of the binder.
• Binder systems of the generic type are known and are also described in the patent literature. Surprisingly, however, practically no consideration has been given to the extremely important criterion in terms of application of the processability of the two components.
• the two CH-A5-643 521 and -650 482 describe and claim a binder for the production of concrete and mortar.
• the subject of the invention is a binder for the production of concrete and mortar, which contains at least one inorganic, hydraulic binder, such as lime or cement, and at least one plastic, preferably in finely divided form contains.
• the binder is used specifically to manufacture components and / or coverings that are insensitive to impact stress, abrasion and frost-thaw changes. It is characterized in that, in addition to the inorganic, hydraulic binder, in particular Portland cement of conventional composition, iron Portland cement, blast furnace cement, alumina cement, modified Portland cement based on IICaO 7A1 ? 0- CaF, Grenoble cement and / or Roman cement, as plastic at least one, preferably in liquid-dispersed and / or dissolved form, plastic with one
• the binder can also contain finely divided bituminous substances, such as bitumen and / or tar, in ground, dry-dispersed, liquid-dispersed and / or dissolved form, and, if appropriate, further additives.
• EP-B1-0 069 586 is a process for the production of bricks, tiles, etc. with hardening of a composition containing both hydraulic cement and an aqueous dispersion of a polymer by means of a two-stage hardening process, the first stage being carried out under conditions of high humidity and the second stage at elevated temperature under drying conditions for hardening the polymer.
• the aqueous polymer dispersion contains an aqueous dispersion of a polymer or copolymer of a methacrylic or acrylic acid ester, the polymer or copolymer being present in an amount of 10 to 40%, based on the weight of the cement in the composition, and the polymer or copolymer dispersion has a viscosity of less than 1.5 Pa.s, measured with a Brookfield LVT viscometer, spindle 2, 12 rpm at a temperature of 23 ° C., and a minimum film formation temperature (MFT) of not less than 5 ° C, and that the first stage is carried out at elevated temperature for hydration of the cement.
• MFT minimum film formation temperature
• the curing process should be carried out in a first stage at a temperature of at least 35 ° C. and a relative atmospheric humidity of at least 75% and then, in a second stage, at a relative atmospheric humidity of not more than 50%.
• Measures to improve the processability of the components are only mentioned with regard to the liquid component, the addition of ionic or non-ionic surface-active substances; preferred polymer and / or copolymer dispersions are those which are stable at pH values above 8.
• this invention relates to the special preparation and conditioning of both components;
• the result of the measures according to the invention was unforeseeable even for the person skilled in the art, i.e. very good processability of the two components - so that e.g. automated mixing and application devices can be used on site - as well as the possibility of producing differently firm or elastic coatings from the binder system described here.
• the two-component binder according to the invention which has optimum processability over a wide range, based on a liquid and a solid component, is characterized by
• Ethanolamines fluidized and adjusted to a basic pH using gaseous ammonia and that
• quartz sand surcharge - based on the weight of the solid components - at least 3% by weight quartz fine sand with grain size ⁇ 0.6 mm and at least 0.3% by weight amorphous, hydrophilic silicon dioxide with a specific surface area of> 100 m / g (BET) are homogeneously mixed.
• the two-component binder is further characterized in that the liquid component is fluidized by adding 1.6% by weight of monoethanolamine and adjusted to a pH of approximately 9.5 by supplying gaseous ammonia, and in that the solid - Component 4% by weight of quartz sand with a grain size of 0.1 to 0.5 mm and 0.4% by weight of amorphous, hydrophilic silicon dioxide with a medium-level surface of approx. 130 m / g (BET) can be mixed in .
• the 2-component binder according to the invention is used for the production of
• ethanolamines especially monoethanolamine
• their pH is brought to a value of preferably about 9.5 by adding NH- (g), especially by bubbling the gas.
• NH- (g) especially by bubbling the gas.
• the basic acrylic emulsion used in the examples consisted, according to the information provided by the supplier and according to the analysis results
• This dispersion was based on the addition of 1.6% by weight the conditioned dispersion weight - fluidized monoethanol and brought to a pH of approx. 9.5 by adding gaseous ammonia.
• the cement used in the solid component was a PZ 45 F. This is rich in lime and forms calcium silicate well, which is slowed down by the dispersion (approx. 24 hours delay). His
• the fineness of grinding is between 3200 and 3700 cm / g, which prevents either too rapid a reaction or incomplete hydration of the cement.
• other cements with the specified grinding fineness could also be used. It is important, however, that the film formation of the calcium silicate hydrate phase, which according to Wischers (see Wesche, K.H. Building materials for load-bearing components, part 2, concrete, 1981) takes place in phase 2, i.e. if the cement glue is not delayed after approx. 2 hours.
• FK 1 40% by weight
• FK 2 once 4% by weight
• FK 2 washed quartz (broken) sand and always 0.4% by weight of amorphous, hydrophilic SiO 2 - all based on the weight of the solid components - added.
• To produce a surface leveling mortar the following components were mixed in the specified weight ratios in a tiltable paddle mixer with Z-shaped kneading blades (net capacity 0.5 m, speed 18 and 30 rpm):
• Solid component (FK1) 100 parts by weight (GT) liquid component (LK) 10 GT
• Solids component (FK2) 100 GT liquid component (LK) 50 GT
• test specimens were sealed in accordance with DIN 53122 via Blaugel and sealed for 10 days at a temperature of 23 ° C and a relative humidity of 92% r.L. checked for weight gain. The duration of the measurement was 10 days.
• a water vapor diffusion resistance number of 1585 was measured for the surface filler / elastic concrete system.
• a water diffusion resistance number of 583 was determined for the surface spatula alone.
• test specimens were sealed according to the Engelfried / Klopfer test arrangement using sodium asbestos and under isothermal conditions in a mixture of carbon dioxide (7.6 Itr./hour) and compressed air (5.4 Itr./hour) at a humidity of Max. 3% checked for weight gain.
• test stamps 50 mm x 50 mm were glued on using a 2-component epoxy resin. 24 hours after the composite adhesive had hardened, the test areas were cut dry to a depth of 11 mm into the base plate "B” and 8 mm into the base plate "SP” and the tear resistance was then checked.
• the observed fracture pattern showed a 100% tear in the elast concrete in all samples. This is understandable because it is very elastic.
• test was carried out according to test conditions for coatings on concrete of the Federal Institute for Material Testing in Berlin, once after
• the system of surface filler, layer thickness 5 mm, and elast concrete, layer thickness 3 mm, meets the requirements of static crack bridging up to 1 mm crack width.
• the standard test specimens were after a storage period of and 28 days, at 23 ° C and 65 r.L., according to DIN 53504 para. 4.2 at a temperature of + 20 ° C with a storage period of 7 days 23 ° C, 65% r.L. 1 day + 20 ° C, at + 37 ° C with a storage period of 7 days 23 ° C, 65% r.L. 1 day at + 37 ° C and at - 25 ° C with a storage period of 7 days at 23 ° C, 65% r.L. and 1 day at - 25 ° C, tested for their elongation at break and their resistance to tensile strength.

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• Chemical & Material Sciences (AREA)
• Engineering & Computer Science (AREA)
• Ceramic Engineering (AREA)
• Materials Engineering (AREA)
• Structural Engineering (AREA)
• Organic Chemistry (AREA)
• Analytical Chemistry (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Inorganic Chemistry (AREA)
• Curing Cements, Concrete, And Artificial Stone (AREA)

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Cited By (2)

Citations (7)

• 1988
  • 1988-05-27 CH CH203588A patent/CH676117A5/de not_active IP Right Cessation
• 1989
  • 1989-05-25 WO PCT/CH1989/000098 patent/WO1989011460A1/de not_active Ceased
  • 1989-05-25 AT AT900789A patent/ATA900789A/de not_active Application Discontinuation

Patent Citations (7)

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