CS257527B1 - Cement mixture for piping inside protection - Google Patents
Cement mixture for piping inside protection Download PDFInfo
- Publication number
- CS257527B1 CS257527B1 CS863763A CS376386A CS257527B1 CS 257527 B1 CS257527 B1 CS 257527B1 CS 863763 A CS863763 A CS 863763A CS 376386 A CS376386 A CS 376386A CS 257527 B1 CS257527 B1 CS 257527B1
- Authority
- CS
- Czechoslovakia
- Prior art keywords
- cement
- water
- cementitious
- cement mixture
- inside protection
- Prior art date
Links
- 239000000203 mixture Substances 0.000 title claims abstract description 13
- 239000004568 cement Substances 0.000 title claims abstract description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 7
- 229910001018 Cast iron Inorganic materials 0.000 claims abstract description 3
- 229910001208 Crucible steel Inorganic materials 0.000 claims abstract description 3
- 230000007797 corrosion Effects 0.000 claims abstract description 3
- 238000005260 corrosion Methods 0.000 claims abstract description 3
- 239000003651 drinking water Substances 0.000 claims abstract description 3
- 235000020188 drinking water Nutrition 0.000 claims abstract description 3
- 239000010959 steel Substances 0.000 claims abstract description 3
- 239000004576 sand Substances 0.000 claims description 4
- 239000002245 particle Substances 0.000 claims 1
- 150000001875 compounds Chemical class 0.000 description 3
- 238000005507 spraying Methods 0.000 description 2
- 229910001060 Gray iron Inorganic materials 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
Landscapes
- Rigid Pipes And Flexible Pipes (AREA)
Abstract
Řešení se týká cementové směsi pro vnitřní ochranu potrubí proti korozi a inkrustaci, zejména pro litinová a ocelová potrubí pro dopravu pitné vody. Podstata řešení spočívá v tom, že cementová směs obsahuje v hmotnostním množství 40-45 i cementu pevnostní třídy nejméně 350, 40-45 % slévárenských písků « o zrnitosti djQ = 0,3-0,5 mm a 15-22 % vody.The present invention relates to a cementitious interior composition protection of piping against corrosion and encrustation, especially for cast iron and steel pipes for transport drinking water. The essence of the solution lies in that the cementitious composition contains by weight both 40-45 and cement strength classes at least 350, 40-45% of foundry sands « with djQ = 0.3-0.5 mm and 15-22% water.
Description
Vynález se týká cementové směsi pro vnitřní ochranu potrubí proti korozi a inkrustaci, zejména pro litinová a ocelová potrubí pro dopravu pitné vody.BACKGROUND OF THE INVENTION 1. Field of the Invention The invention relates to a cementitious composition for the internal protection of pipes against corrosion and incrustation, in particular for cast iron and steel pipes for the conveyance of drinking water.
Dosud jsou pro vytvoření cementových výstelek potrubí používány směsi s ostřivem o hrubší zrnitosti v rozsahu jedné třetiny až jedné poloviny tloušťky nanášené vrstvy, což znamená při běžně vytvářených tloušťkách 3-6 mm podle světlosti potrubí zrnitosti = 1 až 3 mm.Until now, mixtures with coarse grain sizes in the range of one-third to one-half of the thickness of the applied layer have been used to form the cement lining of the pipeline, which means at commonly produced thicknesses of 3-6 mm according to the piping clearance = 1 to 3 mm.
Směsi obsahují v hmotnostním množství zhruba 55 % písku, 30 % cementu a 15 % vody.The compositions contain about 55% sand, 30% cement and 15% water by weight.
Nevýhodou současného stavu techniky je, že používaná hrubší zrnitost způsobuje obtíže v nanášení těchto směsí s dostatečnou kvalitou výsledných povrchů zvláště při stříkání těchto směsí.A disadvantage of the prior art is that the coarser grain used makes it difficult to apply these compositions with a sufficient quality of the resulting surfaces, especially when spraying the compositions.
Tuto nevýhodu odstraňuje cementová směs pro vnitřní ochranu potrubí na bázi cementu, písku a vody podle vynálezu, jehož podstata spočívá v tom, že obsahuje v hmotnostním množství 40-45 % cementu pevnostní třídy nejméně 350, 40-45 % slévárenských písků o zrnitostí = = 0,3-0,5 mm a 15-22 % vody.This disadvantage is overcome by the cementitious compound for the internal protection of the cement, sand and water pipes according to the invention, which is characterized in that it contains at least 350, 40-45% of foundry sands with a grain size of 40-45% by weight. 0.3-0.5 mm and 15-22% water.
Výhodou cementové směsi podle vynálezu je, že vzhledem k nižší zrnitosti ostřiva je umožněno v širokém rozsahu použít technologii stříkání i pro tvarově složité součástky potrubí, které dosud nebylo možno cementovými výstelkami dosud používaného složení opatřit v potřebných kvalitách povrchu. Cementová směs podle vynálezu zajišťuje vyšší rovnoměrnost tloušťky vrstvy po ploše a vyšší hladkost povrchu, čímž jsou zaručeny optimální hydraulické poměry v potrubí.The advantage of the cementitious composition according to the invention is that, due to the lower grit size, it is possible to apply the spraying technology to a wide range of pipe components which have not been able to be provided with the cement lining of the composition used to the required surface qualities. The cementitious compound according to the invention ensures a higher uniformity of the layer thickness over the surface and a higher surface smoothness, thus guaranteeing optimum hydraulic conditions in the pipeline.
Jako konkrétní případ cementové směsi podle vynálezu uvádíme cementovou směs, která obsahuje v hmotnostním množství 42 % cementu PC 400, 40 % slévárenského písku zrnitosti = = 0,36 mm a 18 I vody. Tato cementová směs byla použita pro cementovou výstelku trub ze šedé litiny o vnitřním průměru 400 mm, tlouštce stěny 14 mm, přičemž tloušťka nanesené cementové vrstvy činila 5 mm.As a concrete case of the cementitious composition according to the invention, a cementitious composition is disclosed which contains 42% by weight PC 400 cement, 40% foundry sand of grain size = 0.36 mm and 18 liters of water. This cementitious compound was used for the cement lining of gray cast iron pipes with an inner diameter of 400 mm, a wall thickness of 14 mm, the thickness of the applied cement layer being 5 mm.
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CS863763A CS257527B1 (en) | 1986-05-23 | 1986-05-23 | Cement mixture for piping inside protection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CS863763A CS257527B1 (en) | 1986-05-23 | 1986-05-23 | Cement mixture for piping inside protection |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CS376386A1 CS376386A1 (en) | 1987-08-13 |
| CS257527B1 true CS257527B1 (en) | 1988-05-16 |
Family
ID=5378658
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CS863763A CS257527B1 (en) | 1986-05-23 | 1986-05-23 | Cement mixture for piping inside protection |
Country Status (1)
| Country | Link |
|---|---|
| CS (1) | CS257527B1 (en) |
-
1986
- 1986-05-23 CS CS863763A patent/CS257527B1/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| CS376386A1 (en) | 1987-08-13 |
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