1. What is a water-reducing agent?
For concrete construction projects, water-reducing agents are commonly used. It can effectively improve the plasticity of concrete. So What is a water reducing agent?
Water-reducing agent is a concrete admixture that can reduce the amount of mixing water while maintaining the slump of concrete basically unchanged. It is generally an anionic surfactant. When added to the concrete mixture, it will Cement particles have a dispersing effect, which can improve its workability, reduce unit water consumption, and improve the fluidity of concrete mixtures; or reduce unit cement consumption and save cement.
Water-reducing admixture is mainly used in concrete projects from C15 to C60 and above. Especially for concrete projects with quality requirements, this kind of admixture is indispensable.
2. What are the categories of water reducing agents
There are many types of water reducing agents. It can be divided into different types according to different classification methods:
1. According to appearance
It can be divided into water agent and powder. Water agent water-reducing agent There are generally three types of solid content: 20%, 40% (also called mother liquor), and 60%. The solid content of powders is generally 98%.
2. According to the water-reducing ability of water-reducing agents,
can be divided into ordinary water-reducing agents (also known as plasticizers, the water-reducing rate is not less than 8%, represented by lignosulfonates), high-efficiency water-reducing agents (also known as superplasticizers, the water-reducing rate is not less than 14%, including naphthalene series, melamine series, sulfamate series, aliphatic series, etc.) and high-performance water-reducing agents (water-reducing rate is not less than 25%, represented by polycarboxylic acid-based water-reducing agents).
3. According to the enhancement ability, it can be divided into three types: early strengthening type, standard type and slow setting type.
4. According to the composition of materials, it can be divided into lignosulfonates, polycyclic aromatic salts, and melamine-based high-efficiency water-reducing agents. Classes, sulfamate series superplasticizers, fatty acid series superplasticizers, polycarboxylate series superplasticizers, etc.
3. Application scope of water-reducing admixture
Water-reducing admixture is mainly used in pumping or normal concrete projects with strength levels of C15~C60 and above. , especially suitable for formulating high durability, high flow state, high slump retention, high strength andConcrete projects with high requirements on appearance quality. It is extremely beneficial for preparing high-fluidity concrete, self-compacting concrete, and fair-faced concrete.
Ordinary water reducing agents should be used for concrete construction where the daily minimum temperature is above 5℃. High-efficiency water-reducing admixtures are suitable for concrete construction where the daily minimum temperature is above 0°C, and are suitable for preparing high-fluidity concrete, high-strength concrete and steam-cured concrete.
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