According to the mechanism analysis of the slump loss of concrete with superplasticizer, it is considered that the following measures can be taken to effectively control: (1) post-mixing method or batch adding method; (2) appropriate increase of water reduction (3) using a carrier fluidizing agent; (4) compounding a certain amount of reactive high molecular material; (5) appropriately compounding the air entraining component; (6) properly compounding the water retaining and plasticizing components (7) Adopt new measures in the synthesis process of high-efficiency water reducer; (8) Appropriately compound the retarding components; (9) Take comprehensive measures.

Since the successful development and application of lignosulfonate water reducer in 1935, the development of admixtures has been more than 60 years old. The successful application of admixtures has brought a real revolution to the development of concrete technology because The application of the admixture can not only affect the construction of the concrete in the fresh mixing stage, but also improve the structure of the hardened concrete body from the microscopic and submicroscopic levels, so that the concrete can be modified by means of admixture.

In recent years, polycarboxylate water reducers have gradually moved from experimentation to practice. More and more scholars' attention and scientific research have provided many references for the development of this field. Today's polycarboxylate superplasticizers control the fluidity of concrete mixes and control fluidity losses by controlling the concentration of long and short side chains in the polymer. However, most of the superplasticizers are naphthalene. Because of its relatively low slump loss during use, it is unable to meet the relevant technical requirements, and because of the instability of the composite product, it has an effect on the hardening and durability of the concrete. This weakness is a key factor in inhibiting its development. The sulfamic acid system has a monocyclic aromatic hydrocarbon type structural characteristic.

In the construction process of highway engineering, concrete is an extremely important building material, which has a relatively large impact on the quality of highway engineering construction. In the concrete construction process, in order to ensure the performance of the concrete and improve the applicability of the concrete, an admixture is generally added to the concrete. As an indispensable part of concrete, concrete admixture can significantly improve the quality of concrete by adding admixture to concrete, improve the performance of concrete, reduce the amount of cement in concrete, and save construction costs. In the actual application process, different types of admixtures have different functions. In practical applications, they should be carefully selected and applied reasonably to ensure the construction quality of concrete. Therefore, it is necessary to correctly understand the concrete admixture so as to fully exert the effect of the admixture.

　Cement grinding aids play an important role in the cement industry, especially during the “low carbon” period, in order to clean the environment and improve energy efficiency. Cement grinding aids have become recognized as important cement additives because they can effectively shorten the grinding time, improve cement performance, and save energy and reduce emissions. Therefore, it is very important to develop the grinding aid product process. At present, there are many literatures and work on the development of cement grinding aid products, including: one-component type, such as triethanolamine, glycerol, ethylene glycol, phosphate, molasses, etc. Ethanolamine is the representative. The effects of the components on the cement grinding effect, energy saving and cement strength are investigated. The results show that triethanolamine has a good effect on cement grinding. The series compounding type, this kind of grinding aid reduces the cost of raw materials and improves the auxiliary.

Since the 1930s, cement grinding aids have been used in the cement industry. The earliest patents of the 1930s tested and used powdered mixtures of mineral oil, animal oil and petroleum cracking residues to improve the water resistance of cement products and improve the high early strength and processability of cement. It is combined with hydrochloric acid or calcium chloride, lime-type calcium-containing material and an inert adsorbent mineral material as a carrier. These admixtures greatly improve the water resistance of the cement series and improve its processability.

Cement grinding aids are good products that are conducive to energy saving in grinding and help to improve the particle properties of the material being ground. For a long time, cement grinding aids have been promoted and applied in cement production, and have achieved good energy-saving and emission-reducing effects. However, in the marketing and promotion of grinding aid products, I believe that there are some “misleading” tendencies that have helped Under the pursuit of different interests, the grinding agent production and operation parties and the cement enterprise users have some deviations in the understanding of the essential properties of the grinding aid product quality. For example, the focus of the use of grinding aids is one-sidedly placed on the functional aspects of “reducing the amount of clinker used, increasing the amount of mixed materials” and “increasing the early strength of cement for three days”.

At this festival, Shijiazhuang Haisen Chemical is participating in the cement concrete exhibition held in Vietnam, and welcomes like-minded friends to visit.

Haisen Chemical has a development history of more than 20 years. It has its own factory and team. It is a manufacturing R&D enterprise combining domestic and foreign trade. We mainly produce triethanolamine, mother liquor and monomer of polycarboxylate water reducer, diethanol monoisopropanolamine, polyethylene glycol, cement grinding aid and other products. Among the customers we have worked with, the feedback is still relatively good. Horizon Admixtures always think truly lasting economic performance from honest business, we believe"STRENUOUSNESS MAKES GOOD ACHIEVEMENT HONESTY MAKES GOOD BUSINESS QUANLITY FIRST CUSTOMERS SUPREME " Horizon supply superior products and perfect services, working togethrt with friends from home and abroad for win-win future.

While retaining the intrinsic biological activity of natural proteins, PEG ylated proteins can effectively overcome some of the shortcomings of protein drugs in clinical applications, such as increasing plasma half-life, enhancing bioavailability, reducing protein immunogenicity, and improving drug efficacy. And safety, etc. In order to couple PEG to proteins under milder reaction conditions, PEG is activated, and the activated PEG is coupled to an amino group, a thiol group or a carboxyl group on the protein molecule. Many organic small molecule drugs have gradually adopted PEG modification technology, and some progress has been made. The modification of small molecule drugs by polyethylene glycol can transfer many of its excellent properties to the conjugate, so that the polymer Has excellent biocompatibility.