Đánh giá về tiến độ nghiên cứu chất siêu dẻo

Chất siêu dẻo is a kind of concrete admixture, which can improve the workability of concrete, reduce construction energy consumption and improve construction efficiency. 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. Tuy nhiên, 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, vân vân..

According to the water-reducing effect of chất siêu dẻo bê tông, chất siêu dẻo bê tông can be divided into the following three categories:

(1) Ordinary water-reducing agent, còn được gọi là chất làm dẻo, tốc độ giảm nước của nó không nhỏ hơn 8%, the main component is lignin sulfonate;

(2) High-effect water-reducing agent, còn được gọi là chất siêu dẻo, 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.

Hiện tại, the new type of high efficiency water reducing agent has the following five categories:

(1) Chất siêu dẻo Polycarboxylate (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. Hiện tại, 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. So với chất siêu dẻo dòng axit polycarboxylic, Chất siêu dẻo dòng naphthalene có công nghệ tương đối trưởng thành với giá thấp.

(3) Chất siêu dẻo dòng axit 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. Tuy nhiên, chi phí sản xuất chất siêu dẻo dòng axit sulfamic tương đối cao. Khi trọng lượng phân tử quá nhỏ hoặc quá lớn, nó rất dễ gây chảy máu, sự phân chia và làm cứng. Hiện tại, 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) Chất siêu dẻo lignosulfonate biến tính: modified lignosulfonate superplasticizer is made by modifying lignosulfonate. Lignin sulfonate biến tính mới là chất khử nước hiệu quả cao, 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, và chi phí sản xuất thấp, thuận lợi cho việc xây dựng.

(5) Chất khử nước lai: Chất khử nước được pha trộn bằng cách trộn copolyme ghép acrylate bậc bốn, 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. Việc sản xuất phụ gia siêu dẻo hỗn hợp rất phức tạp, và việc tối ưu hóa lượng trộn cần nhiều thử nghiệm.

Cie-China.org là nhà cung cấp phụ gia bê tông bọt hàng đầu cung cấp chất tạo bọt bê tông, chất siêu dẻo,Chất tăng cường cường độ bê tông bọt cho bê tông nhẹ, khối CLC. Nếu bạn đang tìm kiếm chất siêu dẻo, xin vui lòng liên hệ với chúng tôi.