The rapid development of modern concrete technology and the diversity of concrete types are completely inseparable from the successful application of concrete admixtures. The core of modern concrete technology is actually additive technology. In fact, concrete admixtures have become one of the indispensable components of modern concrete technology. For a long time, the industry has been strengthening the research on concrete admixtures and their application technology, strengthening the promotion of new concrete admixture products, new technologies, and new processes to the engineering community, and vigorously training technical personnel so that they can accurately grasp the performance of various admixtures. , and how to correctly select and use various admixtures with different properties for specific projects so that they can exert the best effect and achieve due economic and social benefits. It is of great significance to further the healthy development of high-tech technologies such as performance concrete and ensure the healthy development of China's admixture industry
The development history of concrete admixtures
1. The United States first proposed in the early 1990s The concept of high-performance concrete (HPC) is a successful example of combining new superplasticizers with concrete material science.
2. In 1824, British I. Aspdin obtained the patent for Portland cement, and cement concrete was widely used.
3. In 1962, Japan's Hattori Kenichi first used naphthalene sulfonate formaldehyde condensate (n≈10) as a concrete dispersant. In 1964, Japan's Kawang Soda Company sold it as a product.
4. In 1963, the Federal Republic of Germany developed a functional melamine sulfonate formaldehyde condensate, and at the same time, polycyclic aromatic hydrocarbons sulfonate formaldehyde condensation appeared.
5. In 1966, Japan first applied high-strength concrete and began to produce prestressed concrete piles.
6. From 1971 to 1973, Germany was the first to successfully develop superplasticizer into fluid concrete, and the vertical concrete pumping height reached 310m.
7. The current development direction is the research on HPC and the use of composite superplasticizer (CSP) to realize the full calculation method design of HPC mix ratio and CSP formula design.
The concrete admixture industry, as an intersection industry between surfactant disciplines and building materials disciplines, has high requirements for professional qualifications. The development level of the industry is significantly affected by the macroeconomic situation, upstream raw material prices and downstream market demand. , with the continuous rise in domestic petrochemical product market prices in recent years, the cost of raw materials has increased year by year, thus compressing the profit margins of concrete admixture companies. In the past three years, the industry's gross profit level has decreased year by year. The main factors affecting the industry development rate are: downstream The prosperity of the construction industry, industry competition pattern, fluctuations in raw material prices, labor costs, etc.
In the future, as the investment growth rate stabilizes and is affected by a series of national austerity policies, the prosperity of the construction industry may be relatively low. The prosperity has declined compared with previous years. Competition between enterprises will increase, and the level of industry development may decline due to this. In the future, the concrete admixture industry will face elimination and consolidation, and some enterprises with low technical levels and weak funds will Facing elimination.
After the fierce market competition in the past five years, a group of admixture companies with high technical level, certain production scale and good after-sales service have stood out in the tide of market economy, with a large market share. Expansion, development level is also constantly improving. It is expected that in the future, the market will gradually eliminate low-end products through reshuffle, the market entrance of high-quality, high-performance and compound admixture products will expand, and the development level of this industry will reach an inflection point.
Concrete admixtures are greatly affected by raw materials. The proportion of the raw material cost of concrete admixtures to the cost of the product has been above 901% over the years. In recent years, affected by the sharp increase in international resource prices, its main raw material industries include Cai, ethylene oxide and so on. Alkanes, etc. have all risen sharply. This has increased the overall raw material cost of the admixture industry and affected the development level of the industry.
Although the automation level of concrete admixture production enterprises is increasing day by day, transportation, unloading, control, and compounding are all Labor is needed. In recent years, the wage level of workers in our country has increased year by year. In some coastal cities, it is even difficult to recruit workers. This has added a certain burden to enterprise operations. However, given that the industry itself is not a labor-intensive enterprise, if enterprises continue to improve their technical level , improve product quality, improve the marketing system, and strengthen service capabilities, will be able to transfer labor cost pressure.
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