What is polycarboxylate superplasticizer?
Polycarboxylate superplasticizer as the latest generation of high performance superplasticizer, different from the traditional common superplasticizer, has strong dispersibility to concrete, high water reducing rate and small slump loss of concrete, which is a major breakthrough in the history of superplasticizer, so it will become the focus of researchers'in-depth optimization research in the future.
What is the compounding technology of polycarboxylate superplasticizer?
In addition to the "molecular design" method in the mother liquor synthesis technology, polycarboxylic acid high performance superplasticizer products also add small materials such as retarder, air entraining agent, defoamer, thickener, anti-mud agent, etc. make it adapt to the construction needs of concrete in different seasons, different materials and mix ratio, and finally obtain high performance superplasticizer with excellent performance.
For polycarboxylic acid manufacturers with mother liquor synthesis technology, it is a necessary choice to develop high quality polycarboxylic acid superplasticizer and obtain different types of functional mother liquor from polycarboxylic acid synthesis technology.
However, the synthesis and practical application of mother liquor need a period of time, and a type of mother liquor can not well solve many problems faced by superplasticizer in engineering application, while mastering the compounding between mother liquids and the physical compounding of auxiliary small materials is a necessary supplement to the application of polycarboxylic acid superplasticizer, and it is very critical to solve the technical problems faced in the engineering site through the characteristics of mother liquor and the physical compounding scheme of small materials.
Therefore, the compounding technology of polycarboxylic acid superplasticizer is the focus of future researchers.
Compounding of mother liquor of polycarboxylic acid superplasticizer
The compounding of polycarboxylic acid superplasticizer mother liquor can adjust the molecular side chain density of its products. In many cases, the effect of compounding between mother liquids can be 1: 1 > 2. The effect that can not be achieved by a single mother liquor can be achieved by the compounding of multiple mother liquids.
Of course, the prerequisite is to synthesize a variety of monomer mother liquor with good quality and different properties.
It is worth noting that polycarboxylic acid system can not be compounded with nano system, melamine system, aminoavalate and so on.
Composite of polycarboxylic acid superplasticizer and functional small materials
In order to deal with the problems faced by various projects in the actual construction site, the working performance of concrete is required to be higher.
At this time, the compounding of mother liquor alone may not fully meet the requirements, and the performance of concrete may be further improved by adding some functional materials (retarder, air entraining agent, thickener, etc.).
The addition of retarder is an important small material to adjust the setting time of superplasticizer to adapt to different air temperature conditions. sometimes the addition of some retarder will help to reduce slump loss, but it can not be used as an effective method to restrain collapse.
At the same time, in the process of compounding retarder, we should pay attention to the water-reducing effect of retarder, which should be considered in the process of compounding with superplasticizer.
Concrete bleeding is a common problem in engineering, when functional small materials such as air entraining agent and thickener can play a role.
The addition of air entraining agent can increase the air content of concrete and improve its water secretion and viscosity.
However, it should be noted that the air content of concrete should not be too high, otherwise the strength of concrete will be too low.
In the process of compounding polycarboxylate superplasticizer with functional materials, researchers must do the compatibility with polycarboxylate superplasticizers beforehand, and the dosage of functional components needs to be reasonably controlled to avoid side effects as far as possible.
Prospect of compounding technology of polycarboxylate superplasticizer
Reviewing the course of research, development and application of polycarboxylic acid superplasticizer in the past ten years, during this period, we have completed the continuous improvement and renewal of polycarboxylate superplasticizer, and the performance is becoming more and more perfect.
Although there are still some problems of polycarboxylate superplasticizer in concrete engineering and other fields, to a certain extent, it limits the wider application of polycarboxylate superplasticizer. However, we firmly believe that with the accumulation and deepening of the basic theoretical research of polycarboxylate superplasticizer and the summary and improvement of engineering practice experience, polycarboxylate superplasticizer will be engineering-oriented with better technology and economy.
So as to promote the faster development of concrete technology.
In the future, polycarboxylate superplasticizer will gradually replace the traditional common superplasticizer and occupy a larger share of the market. Researchers must speed up the research process of variety series diversification.
At present, all the common type, slow setting type and early strength type mother liquor in the market are far from enough. More functional mother liquor should be developed for compounding or other occasions to meet the engineering requirements for concrete performance.
The development of polycarboxylic acid superplasticizer with specific functions is also the development direction in the future.
With the gradual depletion of natural sand, a large number of machine-made sand and artificial sand will be used in the project site in the future.
The sand potential with high mud content and high stone powder content will affect the performance of concrete.
Researchers should make greater efforts to develop mud-resistant and stone-resistant polycarboxylic acid superplasticizer.
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