Revizuirea progresului cercetării superplastifiantului

Superplastifiant is a kind of concrete admixture, care poate îmbunătăți lucrabilitatea betonului, reducerea consumului de energie în construcție și îmbunătățirea eficienței construcției. In the concrete, water reducing agent is added to the mixture of cement particles to get dispersion effect and to optimize the working performance of cement. Under the condition of keep the concrete slump constant, 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. Cu toate acestea, 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 superplastifiant de beton, superplastifiant de beton can be divided into the following three categories:

(1) Ordinary water-reducing agent, cunoscut și sub denumirea de plastifiant, rata sa de reducere a apei nu este mai mică decât 8%, the main component is lignin sulfonate;

(2) High-effect water-reducing agent, cunoscut și sub denumirea de superplastifiant, 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.

În prezent, the new type of high efficiency water reducing agent has the following five categories:

(1) Superplastifiant policarboxilat (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. The formation of hydration film can not only enhance the adsorption force between molecules but also produce space steric effect as well as good plasticizing effect. But this water reducer is expensive, which makes its application be limited to some extent, and make it has strong selectivity to defoaming agent and air-entraining agent. În prezent, the polycarboxylate superplasticizer with the best comprehensive efficiency is the high performance superplasticizer.

(2) Naphthalene series high-efficient superplasticizer: naphthalene series high-efficient superplasticizer has electrostatic repulsion effect, molecular repulsion between electric charges, just on the cement in the hydration process of its own flocculation has a certain decomposition effect, so that free water drainage it contained would be reduced, and the water reduction effect is obvious. Comparativ cu superplastifiantul din seria acidului policarboxilic, Superplastifiantul din seria naftalină are o tehnologie relativ matură cu preț scăzut.

(3) Superplastifiant din seria acidului aminosulfonic: 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. Cu toate acestea, costul de producție al superplastifiantului din seria acidului sulfamic este relativ ridicat. Când greutatea moleculară este prea mică sau prea mare, este ușor să provoace sângerări, segregare şi întărire. În prezent, 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) Superplastifiant lignosulfonat modificat: modified lignosulfonate superplasticizer is made by modifying lignosulfonate. Noul sulfonat de lignină modificat este un agent de reducere a apei de înaltă eficiență, 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, iar costul de producție este scăzut, care este propice construcției.

(5) Agent hibrid de reducere a apei: agentul de reducere a apei este amestecat prin amestecarea copolimerului cuaternar de copolimer de grefat de acrilat, 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. Producția de superplastifiant mixt este complicată, iar optimizarea cantității de amestecare necesită o mulțime de experimente.

Cie-China.org este principalul furnizor de aditivi pentru beton spumant care furnizează agent de spumă pentru beton, superplastifiant,sporitor de rezistență a betonului spumos pentru beton ușor, blocuri CLC. Dacă cauți superplastifiant, nu ezitați să contactaţi-ne.