At first concrete admixtures were used just to save cement, with the development of construction technology
Due to the use of superplasticizers, high-fluidity concrete, self-compacting concrete, and high-strength concrete are applied; due to the addition of thickeners, the performance of underwater concrete can be improved; due to the addition of retarders, the time between cement setting can be prolonged Therefore, it is possible to reduce the slump loss and prolong the operation time; due to the use of antifreeze, the freezing point of the solution can be reduced, or the deformation of the ice crystal structure will not cause freezing damage. Construction at negative temperatures is possible.
Precautions for the use of Polycarboxylate type superplasticizer
Polycarboxylic acid superplasticizer has water reduction, enhancement and slump protection, is an important additive to improve the performance of concrete, but, in use, there are also some matters need to pay attention to.
Precautions for the use of polycarboxylic water reducer:
1, there are problems with the adaptability of cement. For individual cement will appear low water reduction rate, slump loss is larger phenomenon, therefore, in the poor adaptability with cement, the need for polycarboxylic acid water reducer test adjustment, in order to ensure the use of good results.
2. Sensitive to the change of raw materials. When the quality of sand, stone materials and admixtures such as fly ash, mineral powder and other raw materials changes greatly, it will have a certain impact on the performance of concrete, and it needs to be adjusted appropriately at this time.
3. Because of the high water reduction rate of Polycarboxylate type superplasticizer, the water consumption is very sensitive to the slump of coagulation coating. Therefore, in the process of use must strictly control the amount of polycarboxylic acid water reducing agent and concrete water consumption. Once excess, concrete will appear segregation, bleeding, hardening and gas content is too large and other undesirable phenomena.
4. It is particularly sensitive to the aggregate mud content, and too much mud content will reduce the performance of polycarboxylic acid water reducer. Therefore, the quality of aggregate should be strictly controlled when using polycarboxylic acid water reducer. The dosage of polycarboxylic acid water reducer should be increased when the aggregate mud content is increased.
5. The polycarboxylate superplasticizer cannot be mixed with the naphthalene superplasticizer. The use of the polycarboxylate superplasticizer must be cleaned with a naphthalene superplasticizer mixer and mixer, otherwise it may cause the polycarboxylate superplasticizer to lose water. influences.
6. Long-term contact with ferrous materials should be avoided. Because polycarboxylate superplasticizer products are often acidic, and long-term contact with iron-containing products will react slowly, and even make the color darker and darker, resulting in reduced product performance. It is recommended to use polyethylene plastic or stainless steel drums for storage to ensure the stability of its performance.
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