Correlation between synthesis and compounding technology of polycarboxylate superplasticizer The polycarboxylate superplasticizer is designed according to the mechanism of dispersing cement to design an effective molecular structure to prevent concrete slump loss without causing significant retardation, high plasticizing effect, good fluidity and cement adaptation. Sexuality, concrete reinforcement effect is remarkable, reducing concrete shrinkage, extremely low content of harmful substances and other technical performance characteristics, thus giving concrete more excellent construction workability, good strength development, excellent durability, and good comprehensive technical performance advantages. And environmental protection features, in line with the needs of modern concrete engineering. Therefore, polycarboxylate superplasticizers are becoming the preferred admixture for the preparation of high performance concrete.

Polycarboxylate Superplasticizers, also known as high range water reducers, are chemicals used as admixtures where well-dispersed particle suspension are required. These polymers are used as dispersants to avoid particle aggregation, and to improve the flow characteristics or rheology of suspensions such as in concrete applications. Their addition to concrete or mortar allows the reduction of the water to cement ratio, not affecting the workability of the mixture, and enables the production of self-consolidating concrete and high performance concrete. This effect drastically improves the performance of the hardening fresh paste. Indeed the strength of concrete increase whenever the amount of water used for the mix decreases. The new generation of this kind of admixtures is represented by polycarboxylate ether based superplasticizers (PCEs). With a relatively low dosage (0.15–0.3% by cement weight) they allow a water reduction up to 40%, due to their chemical structure which enables goo

Introduction to the performance of cement grinding aids The so-called cement grinding aid is an admixture that aids in grinding in the cement grinding process to improve cement grinding and improve production efficiency without compromising cement performance. In order to improve the water resistance of the cement series, improve the early strength and the processability of the cement, the powder mixture of mineral oil, animal oil and petroleum cracking residue is tested and used, and combined with hydrochloric acid or calcium chloride, lime or calcium-containing substance. Minerals with inert and adsorptive properties are used as carriers. These admixtures greatly improve the water resistance and processability of the cement series.

Polyethylene glycol (PEG), also known as polyethylene oxide (PEO) or polyoxyethylene (POE), refers to a polymer of ethylene oxide. These three names are generally synonymous today, but historically polyethylene glycol often refers to oligomers and polymers with a molecular mass of less than 20,000 g/mol, PEO refers to polymers with a molecular weight of more than 20,000, and POE can refer to any Molecular mass of polymer.

Set retarding concrete admixtures are used to delay the chemical reaction that takes place when the concrete starts the setting process. These types of concrete admixtures are commonly used to reduce the effect of high temperatures that could produce a faster initial setting of concrete. Set retarding admixtures are used in concrete pavement construction, allowing more time for finishing concrete pavements, reducing additional costs to place a new concrete batch plant on the job site and helps eliminate cold joints in concrete. Retarders can also be used to resist cracking due to form deflection that can occur when horizontal slabs are placed in sections. Most retarders also function as water reducers and may entrain some air in concrete.

Absorption treatment of trichloroethylene waste gas Polyethylene glycol has different surface activities depending on its degree of polymerization, and can change the surface properties of aqueous solutions to varying degrees. It has been extensively studied in the treatment of exhaust gas absorption, especially in the treatment of toluene waste gas, which is remarkable. effect. Pingping Plus O-25 is a fatty alcohol polyoxyethylene ether with good hydrophilic properties.

As a kind of surfactant, flattening and adding O can reduce the surface tension of the solution. When its concentration is below the critical micelle concentration, the surface tension of the solution decreases with the increase of the level of O and the concentration of O. Then the change in surface tension is small. The reduction of the surface tension of the dyeing liquid is beneficial to the dyeing liquid to wet the fiber, which is beneficial to the dyeing and spreading of the dye. On the other hand, the addition of O can also form a certain combination with the dye, and the degree of binding generally increases with the increase of the level of O and O. The combination of the flat addition of O and the dye reduces the dye uptake speed.

Polycarboxylate superplasticizer can produce ideal water reduction and reinforcement effect when the dosage is low, less influence on concrete setting time, better slump retention, and adaptability to cement/mixture It is relatively good, has little influence on the shrinkage of concrete (refers to usually does not excessively increase dry shrinkage), does not use formaldehyde in the production process and does not discharge waste liquid, low content of sulfonate and chloride ion, etc. A new generation of water reducing agent after melamine, aliphatic and sulfamate water reducing agents. The polycarboxylic acid-based water reducing agent has a high water-reducing rate, excellent moisture retention performance, and good adaptability to cement, but its application range is limited due to its high price. By compounding, the price of the water reducing agent can be reduced, and some aspects of its performance, such as early strength, retardation, deflation, and defoaming, can be enhanced.

Poly-Carboxylate is a superplasticizer for high performance concrete, high strength concrete, high volume fly ash/slag concrete and grouting/self-leveling screed/mortar.

We can draw the following conclusions: (1) TEA, TIPA and DEIPA are good cement grinding aids and have good grinding aids. (2) TEA has excellent early strength improvement, but it can not even weaken the late strength of cement; TIPA can not promote the early strength of cement, but can improve the characteristics of late strength; DEIPA has the advantages of both, for early strength And the late strength has been significantly improved. (3) Due to the prevalence of chloride salt early strength agents and triisopropanolamine compared with triethanolamine, there are many advantages in terms of dispersibility, age enhancement, application conditions and relative cost, so the application is gradually increasing. , an increasingly widespread replacement of triethanolamine. (4) Diethanol monoisopropanolamine has a strong advantage in strength of both early strength and late strength, and will replace triethanolamine and triisopropanolamine.