Why can water-reducing agent effectively improve the plasticity of concrete?
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Author : Lzh
Update time : 2023-02-06 13:46:40
What is water-reducing agent? Water-reducing agent refers to an additive that can reduce the mixing water consumption under the condition that the slump of the concrete mixture is the same. The water-reducing agent is a kind of surface active agent; that is, its molecule is composed of the hydrophilic group and hydrophobic group. The molecular structure diagram of surface active agent When the cement is mixed with water, if there is no water-reducing agent, the cement slurry will form a flocculation structure due to the role of molecular cohesion between cement particles, As shown in the following figure, after mixing with water, a part of the free water of the mixing water is wrapped in the flocculation structure of the cement particles, thus reducing the fluidity of the concrete mixture. Suppose the water-reducing agent is added to the cement slurry. In that case, the hydrophobic group of the water-reducing agent will be adsorbed on the surface of the cement particles, making the surface of the water-mud particles have the same electric charge. Under the action of the electric repulsion, The cement particles are separated, as shown in the following figure. The cement slurry is added with water reducing agent to release the free water in the flocculation structure. The adsorption - dispersion and wetting - lubrication of the water-reducing agent make the concrete mixture more mobile without increasing water consumption. In addition, the water-reducing agent can also form a layer of solvated water film on the surface of the cement particles, as shown in the figure below, which plays a good lubrication role between the cement particles.
Function and use of water-reducing agent Naphthalene series superplasticizer is often used to prepare high-fluidity, high-strength, and high-performance concrete. According to the content of Na2SO4 in its products, naphthalene series superplasticizer can be divided into high-concentration products with Na2SO4 content<3%, medium-concentration products with Na2SO4 content of 3%~10% and low-concentration products with Na2SO4 content>10%. Most naphthalene series superplasticizer synthesis plants can control Na2SO4 content below 3%, and some advanced enterprises can even control it below 0.4%.
Development history of water-reducing agent Due to the important contribution of superplasticizers to concrete modification, its application has become the third breakthrough in the history of concrete development after reinforced concrete and prestressed concrete. With the development and application of superplasticizers as a sign, concrete technology has entered the third generation from plasticity and dryness to fluidization. In the early 1990s, the United States first proposed the concept of high-performance concrete (HPC), which requires high strength and fluidity of concrete, High durability, and other properties. High-performance concrete puts higher requirements for a water-reducing agent, which requires a high water-reducing rate, large fluidity, and small slump loss over time. Some new high-performance water-reducing agents, such as polycarboxylic and sulfamic acid series superplasticizers, have been rapidly developed and applied.
Price of water-reducing agent Water-reducing agent particle size and purity will affect the product's price, and the purchase volume can also affect the cost of the water-reducing agent. A large amount of large amount will be lower. The price of the water-reducing agent can be found on our company's official website.
Water-reducing agent supplier Luoyang Tongrun Nano Technology Co. Ltd. (TRUNNANO) Luoyang City, Henan Province, China, is a reliable and high-quality global chemical material supplier and manufacturer. It has more than 12 years of experience providing ultra-high quality chemicals and nanotechnology materials, including water-reducing agents, nitride powder, graphite powder, sulfide powder, and 3D printing powder. If you are looking for a high-quality and cost-effective water-reducing agent, you are welcome tocontact us or inquire at any time.
