Kev tshuaj xyuas kev tshawb fawb ntawm Superplasticizer

Superplasticizer yog ib hom khoom sib xyaw pob zeb, uas tuaj yeem txhim kho kev ua haujlwm ntawm pob zeb, txo kev siv zog hauv kev tsim kho, thiab txhim kho kev ua haujlwm ntawm kev tsim kho. Hauv pob zeb, water reducing agent is added to the mixture of cement particles to get dispersion effect and to optimize the working performance of cement. Nyob rau hauv qhov xwm txheej ntawm kev khaws cov pob zeb nplaum ruaj khov, mixing and subtract agent can greatly reduce the unit water use of concrete mixture, reduce the water cement ratio of concrete, the strength and stability of the reinforced concrete. Or in the concrete workability and strength of the same condition, adding water reducer can reduce the unit of cement, save cement. However, the application of superplasticizer in concrete also has some problems, such as the majority of superplasticizer ions being anionic surfactants, lignin sulfonate, Naphthalene sulfonate formaldehyde polymer., etc..

According to the water-reducing effect of concrete superplasticizer, concrete superplasticizer can be divided into the following three categories:

(1) Ordinary water-reducing agent, also known as plasticizer, its water-reducing rate is not less than 8%, the main component is lignin sulfonate;

(2) High-effect water-reducing agent, also known as superplasticizer, water reduction rate is not less than 14%, the main component is represented by tea water-reducing agent;

(3) High-performance superplasticizer, water reduction rate is not less than 25%, regarding polycarboxylic acid series superplasticizer as a representative.

Tam sim no, the new type of high efficiency water reducing agent has the following five categories:

(1) Polycarboxylate superplasticizer (carboxylic acid water reducing agent): poly carboxylic acid system has a lot of chain between the molecules of water reducing agent of some strong polarity in the main chain anions with surface bonded to a piece of electricity. Kev tsim ib txheej hydration tsis tsuas yog txhawb nqa lub zog nqus ntawm cov molecules xwb tabsis kuj tsim tau ib qho kev cuam tshuam chaw thiab ua rau plasticizing zoo. Tab sis qhov tshuaj txo dej no kim heev, uas ua rau nws siv tau txwv qee qhov, thiab ua rau nws muaj kev xaiv tshwj xeeb rau cov tshuaj tshem npuas thiab cov tshuaj txhawb cua. Tam sim no, Polycarboxylate superplasticizer uas muaj kev ua tau zoo tshaj plaws yog tus superplasticizer ua haujlwm siab.

(2) Naphthalene-based high-efficiency superplasticizer: Naphthalene-based high-efficiency superplasticizer muaj kev tshem tawm hluav taws xob, Kev tshem tawm molecular ntawm cov nqi hluav taws xob, Nws muaj kev cuam tshuam rau kev tawg ntawm cement thaum nws tus kheej hydration, Yog li dej dawb uas nws muaj yuav raug txo, and the water reduction effect is obvious. Compared with polycarboxylic acid series superplasticizer, naphthalene series superplasticizer has a relatively mature technology with low price.

(3) Aminosulfonic acid series superplasticizer: aminosulfonic acid series superplasticizer is a non-air-entraining resin type high-efficiency superplasticizer, the water reduction rate can reach more than 25%, which make the concrete workability and durability have significant enhancement. However, the production cost of sulfamic acid series superplasticizer is relatively high. When the molecular weight is too small or too large, it is easy to cause bleeding, segregation and hardening. Tam sim no, the research of this kind of water-reducing agent is mostly through modifying aminosulfonic acid and dispersing cement particles, which can effectively reduce the shortcomings in use and expand the market prospect.

(4) Modified lignosulfonate superplasticizer: modified lignosulfonate superplasticizer is made by modifying lignosulfonate. The new modified lignin sulfonate is a high-efficiency water-reducing agent, the water-reducing rate is 1.5 times higher than that of the ordinary water-reducing agent, and the hydration heat and collapse degree of cement are changed to effectively ensure the excellent performance of concrete, and the production cost is low, which is conducive to construction.

(5) Hybrid water reducing agent: water reducing agent is blend by mixing the quaternary copolymer acrylate graft copolymer, contains amino benzene sulfonic acid maleic acid amide and vinyl pyrrole copolymer, and at the same time other copolymer containing sulfonic acid and carboxylic acid based collection to a piece, thus using the functions of their different anion and polarity of functionality, can be used as a super plasticizer all kinds of polymer and copolymer, thereby interacting with cement particles. The production of mixed superplasticizer is complicated, and the optimization of mixing amount needs a lot of experiments.

Cie-China.org yog tus thawj coj ua npuas ncauj qhob ntxiv muab cov pob zeb ua npuas ncauj ua npuas ncauj, superplasticizer,Ua npuas ncauj qhob lub zog enhancer rau lub teeb yuag pob zeb, CLC blocks. Yog tias koj tab tom nrhiav superplasticizer, thov koj xav tias dawb rau tiv tauj peb.