Water-reducing agent solution for these three
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The water-reducing agent should be used with concrete admixture, which will reflect the water-reducing effect. Cement quality is therefore a direct factor of the effect of water-reducing agent.
There are different strategies to adopt when encountering "problem" cements.
High alkali cement
A cement that contains a lot of alkali is called high-alkali. Alkali in high-alkali is usually higher than that of conventional cement.
The high-alkali cements have a high degree of alkalinity. This can impact the performance. High-alkali Cement can encourage the setting reaction, which is beneficial to the early development of strength in concrete. High-alkali Cement can also increase the fluidity of cement, making it more workable and easier to pump.
But there are also some issues with high-alkali clinkers. As an example, high alkali cements can reduce the efficiency of water-reducing agents and cause concrete to lose its slump faster. High-alkali cement may also lead to corrosion and carbonation problems in the concrete.
High-alkali Cement can benefit from water-reducing agents containing a higher content of sodium sulfate. High-alkali cement contains a high amount of alkali, which accelerates C3A's dissolution. Sodium sulfate reacts with C3A, forming AFt crystals. This improves the fluidity of the cement mortar.
Low-alkali sulfur-deficient cement
Low alkali-sulfur cement is a cement with a lower sulfate level than normal cement. Ordinary cement is high in sulfate. It reacts with water and the sulfate forms crystals that cause cracking.
Reduced sulfate cement content reduces the alkali silica reaction (also called the reaction between the aggregate and the alkali) in concrete. The alkali silica reaction is a reaction between the alkalis of the cement and the silicates found in the aggregate. It causes concrete to expand, cracking. The use of low-alkali cements that are sulfur-deficient can help reduce this reaction, and increase the durability and life of the concrete.
Due to the lower sulfate contents, water reducers work less well with low alkali-sulfur cement. Water-reducing agents can cause concrete to lose slump quickly if they are used in excess. In this case, the conventional method of using water-reducing agents may be ineffective. Instead, it is recommended to choose a water reducing agent that contains sulfate.
High C3A cement content
Cement with a high C3A-content is one that has a higher content of C3A. C3A is a mineral present in cement, which reacts to water and forms an expansive substance. C3A cements are characterized by a high early strength as well as a shorter setting time. They are ideal for projects that call for rapid setting.
Cement with high C3A levels can cause some problems. C3A and sulfate react to form sulphoaluminate. This can cause concrete to expand or crack. In humid environments, high C3A cements can produce corrosive Calcium Sulfate Precipitates, which may affect the durability of concrete and steel structures.
Cement with high C3A will have a greater ability to bind water-reducing agents. This will result in a reduction of the fluidity of concrete and its slump. If you are using a water-reducing chemical, choose a water-reducing agent that has a high sulfate content or a retarder which contains hydroxycarboxylate. These will help reduce C3A adsorption and improve concrete fluidity.
There are two kinds of products that reduce water: one is the naphthalene-based water-reducing product, and another is polycarboxylic-acid-based water-reducing product. The main difference in water reduction is the naphthalene. It is high-efficiency, and polycarboxylic is high-performance. For general foam concrete, the naphthalene cubic addition is between a few hundred grams and a kilogram.