By Compound to improve the overall performance of polycarboxylate superplasticizer

Abstract: In order to give full play to the advantages of polycarboxyate superplasticizer. In practical use, it is usually used to make it functional, make up for the shortcomings, or reduce the cost of its application.

In recent years, whether it is real estate or roads and Bridges and other industries are advancing by leaps and bounds, in the actual construction, concrete performance on the quality of the impact is quite large Water reducing agent of them have become the indispensable important part of the concrete, polycarboxylate superplasticizer distribution mainly in order to improve the overall performance, as the third generation of high-performance concrete water reducing agent, has obvious advantage, with its high water reducing rate good slump retention and molecular design strong characteristics, are widely used in the concrete engineering both at home and abroad However, it also exists obvious shortcomings.

First of all, polycarboxylate superplasticizer is very sensitive to the use of conditions, under different conditions may have a greater difference in the effect of use; Secondly, the serious air diversion is a major factor affecting the use effect. According to the 2016 annual admixture industry development report, water reducer is the largest domestic production and use of admixtures. In the past few years, the production of polycarboxylate superplasticizer has gradually increased in the proportion of the total water reducer, which has reached 73.5% in 2015 In order to give full play to the advantages, in actual use, it is usually compounded to make it functional, make up for the shortcomings, or reduce its application cost, etc.

Water reducing agent is a common admixture in the preparation of concrete, It can reduce the amount of water used in concrete construction, reduce the water-cement ratio, improve the strength of concrete, shorten the concrete curing age, ensure the construction progress, and make concrete have long-term durability and corrosion resistance. Polycarboxylate superplasticizer is one of the commonly used high efficiency water reducing agent. It is made of polycarboxylate superplasticizer mother liquor according to the performance, dosage, setting time and other requirements after dilution, add certain auxiliary materials, uniform can be directly used polycarboxylic acid water reducer

Compound of polycarboxylate superplasticizer mother liquor

When it is necessary to improve the slump protection performance of water reducer, mother liquor with good slump protection performance can be introduced, or slow release slump protection agent can be introduced directly. When it is necessary to reduce the cost, the economical polycarboxylic acid series water reducer with lower synthesis cost can be introduced. The poly carboxylate superplasticizer mother liquid of water reducing agent compound with the general conducted by the manufacturer can produce a variety of mother liquor, or certain types of polycarboxylate supeplasticizer factory by purchasing other manufacturer of polycarboxylate supeplasticizer and sell products for distribution, or by the water reducing agent distribution enterprise to choose a variety of different manufacturer of polycarboxylate supeplasticizer mother liquid of water reducing agent for distribution. The compound of polycarboxylic acid superplasticizer mother liquor needs experience and a lot of experiments to get the appropriate compound scheme and proportion.

Compound of polycarboxylate superplasticizer with other kinds of water reducer

Generally speaking, lignosulfonate superplasticizer is the only  type of superplasticizer that is soluble and superimposable in polycarboxylic acid series. When polycarboxylic acid series superplasticizer is mixed with naphthalene series superplasticizer, the performance of the product will much decrease.  The experimental study on the composite effect of polycarboxylic acid superplasticizer and aliphatic superplasticizer shows that the composite proportion of polycarboxylic acid superplasticizer and aliphatic superplasticizer has a certain range, and the composite of polycarboxylic acid superplasticizer and aliphatic superplasticizer can improve the slump retention and crack resistance of concrete.

The compound of polycarboxylic acid superplasticizer includes the compound between mother liquor, the compound of other varieties of superplasticizer, and the physical compound of mother liquor and retarder and gas state regulator and other functional components (often refers to small materials). The compound of superplasticizer is not simply mutual combination, but to pursue 1+1 > as far as possible; Due to the high performance sensitivity of polycarboxylic acid superplasticizer, its compound is difficult and its compound effect changes greatly. In order to obtain compound products with excellent performance, many scholars have carried out a large number of experimental studies, in order to obtain conclusions with certain guiding significance Some researchers believe that a reasonable mixing process should first meet the basic requirements through the mixing of mother liquor, and then fine-tune the performance of functional components