Ľahké prísady do betónu | Vysokovýkonné penotvorné prostriedky pre pórobetón
What are na three types of water reducing agents with different water reducing effects?
According to the effect of water-reducing agents, they can be divided into the following three categories: (1) ordinary water-reducing agent, tiež známy ako plastifikátor, jeho miera znižovania vody nie je menšia ako 8%, and its main component is lignin sulfonate; (2) high-efficiency water-reducing agent, tiež známy ako superplastifikátor, its water reduction rate is not less than 14%, and its main component is represented by tea water-reducing agent; (3) high-performance superplasticizer, its water reduction rate is not less than 25%, the polycarboxylic acid series superplastifikátor is regarded as a representative.
What are the five main types of new efficient water reducing agents?
(1) Polycarboxylic acid series of water reducing agent: polycarboxylic acid type of water reducer molecules have a lot of chains. In the main chain there are some strong polar anion and the surface of the electrical layer combined together, which forms a hydrated film. Due to the above mentioned, it not only enhances the adsorption between molecules but also produces spatial steric resistance, and so it has a good plasticizing effect. Avšak, this kind of water-reducing agent is very expensive, so its application is limited to some extent. V súčasnosti, the polycarboxylate based superplasticizer with the comprehensive efficiency and high performance is the best water reducing agent.
(2) Naphthalene series efficient superplasticizer: naphthalene series efficient superplasticizer has electrostatic repulsion effect and molecular mutual repulsion between electric charges. Due to the certain decomposition on the cement in the hydration process of its own flocculation, the free water contained in it can be pushed out. Preto, you can see the water reduction effect is obvious. V porovnaní so superplastifikátorom série polykarboxylových kyselín, Superplastifikátor naftalénovej série má relatívne vyspelú technológiu s nízkou cenou.
(3) Superplastifikátor série aminosulfónových kyselín: modified amino sulfonic acid series superplasticizer is a non-air-entraining resin type high-efficiency superplasticizer, whose water reduction rate can reach more than 25%, to the concrete workability and durability have significant enhancement. Avšak, výrobné náklady na superplastifikátor série kyseliny sulfámovej sú relatívne vysoké. Keď je molekulová hmotnosť príliš malá alebo príliš veľká, je ľahké spôsobiť krvácanie, segregácia a vytvrdzovanie. V súčasnosti, the research of this kind of water-reducing agent is mostly effectively reduce the shortcomings in use and expand the market prospect through modifying aminosulfonic acid and dispersing cement particles.
(4) Modifikovaný lignosulfonátový superplastifikátor: modified lignosulfonate superplasticizer is obtained by modifying lignosulfonate. Nový modifikovaný lignín sulfonát je vysoko účinným činidlom znižujúcim vodu, its water-reducing rate is 1.5 times higher than that of other ordinary water-reducing agents. The hydration heat and collapse degree of cement are changed to effectively ensure the excellent performance of concrete, a výrobné náklady sú nízke, čo je priaznivé pre výstavbu.
(5) Hybridný prostriedok na redukciu vody: Vodné redukčné činidlo sa zmieša zmiešaním kvartérneho kopolyméru akrylátového očkovaného kopolyméru, which contains amino benzene sulfonic acid maleic acid amide and vinyl pyrrole copolymer. And at the same time due to other copolymer containing sulfonic acid and carboxylic acid based combining together, the functions of their different anion and polarity of functionality can be used as a super plasticizer of a variety of polymers and copolymers, and so it can have cement particle effects. Výroba zmiešaného superplastifikátora je komplikovaná, a optimalizácia množstva miešania vyžaduje veľa experimentov.
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