CS262775B1 - A method of producing polymer-cement blends - Google Patents
A method of producing polymer-cement blends Download PDFInfo
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- CS262775B1 CS262775B1 CS873609A CS360987A CS262775B1 CS 262775 B1 CS262775 B1 CS 262775B1 CS 873609 A CS873609 A CS 873609A CS 360987 A CS360987 A CS 360987A CS 262775 B1 CS262775 B1 CS 262775B1
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Abstract
Spůsob výroby polymércementových zinesí na báze reaktoplastov vhodných pre sánému a ochranu betonových a ocelových konštrukcii sa vyznačuje zlepšenými fyzikálno-mechanickými vlastnosťami, ako je pevnost v tlaku, pevnost v tahu za ohybu, adhéznymi vlastnosťami a zvýšenou trvanlivosťou. Okrem stavebníctva je možno polymércementové zmesi používat aj na ochranu polnohospodárskych objektov apod.The method of producing polymer-cement mixtures based on thermosets suitable for the protection and repair of concrete and steel structures is characterized by improved physical and mechanical properties, such as compressive strength, tensile strength under bending, adhesive properties and increased durability. In addition to construction, polymer-cement mixtures can also be used for the protection of agricultural objects, etc.
Description
Vynález sa týká sposobu výroby polymércementových zmesi na báze reaktoplastov, so zlepšenými fyzikálne-mechanickými vlastnostami, vhodné pre sanáciu a ochranu betonových a ocelových konštrukcií.
Cielom modifikácií cementových mált na báze reaktoplastov je Iepšia spracovatelnosť, vyššie ohybové vlastnosti a přilnavost, zvýšená odolnost voči chemickým vplyvom a odolnost voči obrusu. Pri spracovaní polymér-cementových mált dochádza po stránke koloido-fyzikálnej k zvláštnym javom. Disperzná fáza v priebehu času mění svoju povahu napr. keď vo vodě dis pergované čiastočky epoxidovej živice vytvrdnú na duroplast. Pri zmiešaní epoxidovej emulzie s cementovou suspenziou prebiehajú súčasne dva procesy, t. j. tvrdnutie epoxidovej živice a hydratácia cementu. Ak sú přítomné v zmesi emulgátory a organické riedidlá tieto negativné ovplyvňujú proces hydratácie a v konečnom důsledku vlastnosti polymércementovej zmesi (1). Napr. pri používaní přísady komerčnej epoxidovej emulzii o obsahu epoxi skupin 0,42 do cementovej malty, pri obsahu epoxidu 3,66 % z hmotnosti cementu, nastáva pokles v tlaku a v tahu za ohybu o 18 až 40 % v porovnaní s cementovou maltou bez přísady.
Uvedené nedostatky odstraňuje spósob výroby polymércementových zmesi podía vynálezu. Princípom nového spósobu je, že používá pre výrobu polymércementových zmesi namiesto reaktoplastov vo formě emulzíí, reaktoplasty vo formě živíc a to tak, že sa najskór zmiešajú suché zložky zmesi, t. j. cement a piesok so zámesovou vodou, do ktorej sa vopred přidalo tvrdidlo. Vlastnosti po 2-8 dňoch:
S přísadou EP
Po dokonalej homogenizácii sa za stálého miešania přidává příslušné množstvo živice. V případe používania zmesi o tekutej výroby zmesi len časť zámesovej vody zmiešanej s tvrdidlom a zbytok vody sa přidává až po homogenizácii reaktoplastu so zmesou. Používáním nového spósobu výroby polymércementových zmesi na báze reaktoplastov sa dosiahlo zvýšenie fyzikálne-mechanických vlastností ako je pevnosť v. tlaku, pevnosť v tahu za ohybu a pevnosť v ohybe úderom a pevnosť v adhézii k podkladu o 15 až 30 °/o. Technologický postup nanášania polymércementovej malty o betonový podklad spočívá v úpravě povrchu betónu mechanickým očistěním a v nanášaní polymércementového pačoku na povrch betonu. V dalšom sa nanáša vrstva polymércementovej zmesi na báze reaktoplastu o vyšších fyzikálne-mechanických vlastnostlach. Příklad spósobu výroby vysprávkovej polymércementovej malty na báze reaktoplastu·. 21 % hmotnostných portlandského cementu sa zmieša s 63 % hmotnostných křemenného piesku. Do 8 % hmotnostných zámesovej vody sa přidá 0,22 % hmotnostných dietyléntriamínu a po zmiešaní oboch zložiek sa táto zmes zmieša so suchými zložkami, t. j. so zmesou cementu a piesku. K tej-to zmesi sa za stálého miešania přidává 1,85 % hmotnostných epoxidovej živice o obsahu epoxi skupin 0,5. Po dokonalom zhomogenizovaní zmesi sa přidá 5,93 % hmotnosti zámesovej vody za stálého miešania.
Bez přísady
Pevnosť v tlaku v MPa 25,9
Pevnosť v tahu za ohybu v MPa 6,6
BACKGROUND OF THE INVENTION The present invention relates to a process for the production of thermosetting based polymer-cement blends, with improved physical-mechanical properties, suitable for remediation and protection of concrete and steel structures.
The aim of the modification of cementitious mortars based on thermosetting plastics is better workability, higher bending properties and adhesion, increased resistance to chemical influences and abrasion resistance. In the processing of polymer-cement mortars, there is a particular phenomenon in the colloid-physical aspect. The dispersion phase changes in nature over time, e.g., when the water-dispersed epoxy resin particles cure to a thermoset. When the epoxy emulsion is mixed with the cement slurry, two processes, ie, hardening of the epoxy resin and hydration of the cement, take place simultaneously. If emulsifiers and organic diluents are present in the mixture, these will adversely affect the hydration process and ultimately the properties of the polymer cement mixture (1). E.g. when using a commercial epoxy emulsion additive with an epoxy content of 0.42 in a cementitious mortar, at an epoxide content of 3.66% by weight of cement, there is a decrease in bending pressure and tensile strength of 18 to 40% compared to cement-free mortar.
The above-mentioned drawbacks are eliminated by the method of making the polymer cement mixtures according to the invention. The principle of the new method is that it uses the thermosetting resins in the form of emulsions instead of thermosetting plastics in the form of emulsions, by mixing the dry components of the mixture first, ie cement and sand with pre-added water, to which a hardener has been previously added. Features after 2-8 days:
With EP additive
After thorough homogenization, an appropriate amount of resin is added with stirring. In the case of use of a mixture of liquid production of the mixture, only a portion of the mixing water mixed with the hardener and the rest of the water is added only after homogenization of the thermoset with the mixture. The use of a new method for the production of thermoset-based polymer-cement blends has resulted in an increase in physical-mechanical properties such as compressive strength, flexural strength, and bending strength by 15 to 30 ° / o. The technological procedure of applying a polymer-cement mortar to a concrete substrate consists in treating the concrete surface with mechanical cleaning and applying a polymer-cement patch to the concrete surface. Next, a thermoset-based polymer-cement blend layer of higher physical-mechanical properties is applied. An example of a process for the production of thermosetting based polymer cement mortar. 21% by weight of Portland cement is mixed with 63% by weight of quartz sand. 0.22% by weight of diethylenetriamine is added to 8% by weight of the wash water, and after mixing the two components, the mixture is mixed with the dry ingredients, i.e., the cement-sand mixture. To this mixture, 1.85% by weight of epoxy resin having an epoxy content of 0.5 was added with stirring. After homogenizing the mixture completely, 5.93% by weight of the mixing water is added with stirring.
No additive
Compressive strength in MPa 25.9
Flexural strength in MPa 6.6
Claims (2)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CS873609A CS262775B1 (en) | 1987-05-19 | 1987-05-19 | A method of producing polymer-cement blends |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CS873609A CS262775B1 (en) | 1987-05-19 | 1987-05-19 | A method of producing polymer-cement blends |
Publications (2)
Publication Number | Publication Date |
---|---|
CS360987A1 CS360987A1 (en) | 1988-08-16 |
CS262775B1 true CS262775B1 (en) | 1989-04-14 |
Family
ID=5376639
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CS873609A CS262775B1 (en) | 1987-05-19 | 1987-05-19 | A method of producing polymer-cement blends |
Country Status (1)
Country | Link |
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CS (1) | CS262775B1 (en) |
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1987
- 1987-05-19 CS CS873609A patent/CS262775B1/en unknown
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Publication number | Publication date |
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CS360987A1 (en) | 1988-08-16 |
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