some problems in the application of polycarboxylate superplasticizerii
Compatibility of polycarboxylate superplasticizer with other admixtures
Polycarboxylic acid high efficient water reducing agent and many high efficient water reducing agents can not be mixed and formulated in any proportion like naphthalene and aliphatic high efficient water reducing agents. For example, when polycarboxylic acid and naphthalene water reducing agent are compounded, it has the most negative effect on the slump-proof of plastics, and special attention should be paid to it. This also prompts many polycarboxylic acid water reducing agent manufacturers to synthesize the mother liquor with various special functions such as slump-proof, early strength, etc., in order to adapt to the needs of concrete construction in different seasons, different materials and different mixing ratios, and ultimately achieve satisfactory results.However, it takes a period of time for the synthesis and practical application of mother liquor, and a mother liquor can not solve many problems in the engineering application of high-efficient water reducing agent. It is a necessary supplement for the application of polycarboxylic acid high-efficient water reducing agent, and it is very critical to solve the technical problems faced in the engineering site through the characteristics of the mother liquor and the physical compounding program of small materials. It is recommended to use polycarboxylic acid water reducing agent in combination with other components. Be sure to confirm the effect of compounding and the actual effect on concrete through test, and then judge whether polycarboxylic acid water reducing agent can be compounded with other components.
Storage mildew problem of polycarboxylate superplasticizer
Polycarboxylic acid high-efficiency water reducing agent in the summer high-temperature season storage, there will be the emission of bad smell, sealed packaging barrel bulging, open storage tank liquid surface floating point, strip floating and other mold phenomena. Objects often appear. The main reason is that polycarboxylic acid water reducing agent retains the natural bacterial state from the whole process of production to application and consumption, while the commonly used sugar, hydroxycarboxylate and other retardant ingredients provide fungi.Excellent nutrients, the number of fungi grows exponentially in the environment of suitable temperature and humidity and neutral pH. The fungus leaves a large number of corpses after death, which is the root cause of moldy polycarboxylic acid high-efficiency water reducing agent. Therefore, the active ingredients in the moldy polycarboxylic acid water reducing agent are not significantly affected, and the application performance is stable.
Mouldy polycarboxylic acid high-efficiency water reducing agent has a strong smell and more foam on the surface, which is not conducive to the health of workers and the accurate measurement of high-efficiency water reducing agent. Measures must be taken to inhibit it. Among them, the most effective method is to mix fungicides to achieve the effect of bacteriostatic and bactericidal. At the same time, it can also be used to adjust the pH of the water reducing agent to non-neutral (pH ≤ 3. or pH > 9.0), change the type of retarder and other methods.