Compatibility of polycarboxylate superplasticizer with other admixtures

polycarboxylate superplasticizer and many superplasticizers cannot be mixed and compounded in any proportion like naphthalene and aliphatic superplasticizers. For example, the negative effect on plastic slump retention is the greatest when polycarboxylic acid and naphthalene water reducer are compounded, and special attention should be paid. This has also prompted many polycarboxylate water reducer manufacturers to synthesize mother liquors with various special functions such as slump retention and early strength to adapt to the needs of concrete construction in different seasons, materials and mix ratios, and finally achieve satisfactory results. However, the synthesis and practical application of mother liquor requires a period of time, and one type of mother liquor cannot solve many problems in engineering application of superplasticizers. It is a necessary supplement for the application of polycarboxylate superplasticizer, and it is very critical to solve the technical problems faced by the engineering site through the characteristics of the mother liquor and the physical compounding scheme of small materials. It is recommended to use the polycarboxylate superplasticizer in combination with other components. Be sure to confirm the effect of the compounding and the actual impact on the concrete through tests, and then judge whether the polycarboxylate superplasticizer can be combined with other components.

Storage mildew problem of polycarboxylate superplasticizer

When the polycarboxylate superplasticizer is stored in the high temperature season in summer, mildew phenomena such as the release of foul odor, the bulging of sealed packaging barrels, the floating spots on the liquid surface in the open storage tank, and the strip-shaped floating objects often occur. The main reason is that the whole process of polycarboxylate superplasticizer from production to application and consumption is retained in a natural bacterial state, while the commonly used retarding components such as sugars and hydroxycarboxylates provide fungi. Excellent nutrients, in the environment of suitable temperature and humidity and neutral pH, the number of fungi increases exponentially. After the fungi die, a large number of corpses are left, which is the root cause of the mildew of polycarboxylate superplasticizer. Therefore, the active ingredients in the mildewed polycarboxylate superplasticizer are not significantly affected, and the application performance is stable.

The mildewed polycarboxylate superplasticizer has a strong smell and a lot of foam on the surface, which is not conducive to the health of workers and the accurate measurement of the superplasticizer. It is necessary to take measures to suppress it. Among them, the most effective method is to mix bactericides to achieve the effect of bacteriostasis and sterilization. At the same time, methods such as adjusting the pH of the water reducing agent to be non-neutral (pH≤3. or pH>9.0) and changing the type of retarder can also be used.