Who of you knows what are the characteristics of the cement industry?

The low concentration of the cement industry, the small scale of enterprises, the serious overcapacity in local areas, the excessive competition in the market, the low technology content, the high energy consumption and other factors have led to the low profit level of the entire cement industry. And the cement production capacity in the market is far greater than the demand, the actual annual demand for the entire cement is 2.3-2.4 billion tons, but the number is far greater than this figure of 3.5 billion tons. The uneven process technology and management level between enterprises, the imbalance in the supply of raw materials and other reasons make the production cost of the entire cement enterprise obviously different.

In order to seize market share among enterprises, individual large-scale cement enterprises rely on their own strong capital, strong product competitiveness, and low production costs, and their products are lower than the average sales of the industry in the same period, which has a great impact on the overall interests of the industry. At the same time, relatively small cement companies are also trying their best to survive. and so on, resulting in vicious competition and decline in the current cement market, resulting in many enterprises losing money.

General characteristics:1Periodicity:

Because the entire construction industry is greatly affected by the season, this also correspondingly affects the building materials industry, making it seasonal, generally at the end of the year and the beginning of the year the entire commercial concrete industry is in a state of contraction. 2.Regionality:

Due to the limitation of the building materials industry by the effective transportation distance, the regional market is quite different. 3.Investment pull:

The growth of ready-mixed concrete production is directly affected by the growth of real estate construction and large-scale infrastructure projects, and is an investment-driven industry, which is directly affected by macroeconomic policies like cement and other building materials products. This can be seen from the development history of the entire commercial concrete industry to see the clear context of the impact of this factor on the industry. 3.

With scale effect: the scale advantage of the enterprise is obvious, and the equipment utilization rate and supply guarantee capacity are improved. At the same time, because concrete has some unique characteristics in the development process:

1.The production is simple processing, there is no complex kiln, and the technical threshold for entering the industry is relatively low; 2.The discontinuity of production, which often requires a concentration period**; 3.

The regional market equipment capacity is easy to overcapacity, which should lead to first-class competition; The scale of a single enterprise should not be too large, similar to commercial outlets, and it is suitable for reasonable layout in order to maintain reasonable transportation distance, timely transportation, timely service, etc. The cement industry is a heavy industry enterprise with high pollution and high energy consumption, and with the strengthening of national environmental protection, the production line of machine vertical kiln is being phased out. Cement production and sales are seasonal, and June to October is the off-season for generating sales.

Because this time is the rainy season, resulting in heavy moisture of the original burning materials and affecting the output of the main engine, the progress of various projects is also slow due to the rainy season, which reduces the consumption, and another reason is that China's vast rural market, according to the tradition of the Chinese, are moving into new homes before the end of the year. <>

Cost control, one is the production cost but the financial cost. The production cost is mainly the quality management of raw materials, that is to say, after spending the same amount of money to purchase high-quality raw materials, there must be a strict acceptance system for entering the factory. (Hehe, don't just because you have friends and relatives to pull a car of errands, you can make a ** receipt.)

The quality of raw materials directly affects the ratio of various materials and the quality of products. The second is process management. Cement production is flowing, and the products in the previous process are the raw materials in the later process.

As the saying goes: "It is difficult for a good daughter-in-law to cook without rice", the process is to control the entire production process, from the first pass to start a strict check, to lay a good foundation for the next process, so as to ensure that the quality of your products is satisfactory to customers. The third is device management.

To ensure the integrity of the equipment to ensure the normal operation, the so-called normal operation is to achieve the design ability of the equipment. <>

There are several types of cement. It mainly includes Portland cement, ordinary Portland cement, slag Portland cement, pozzolana Portland cement, fly ash Portland cement and composite Portland cement. Raw materials for water head or slag sludge include limestone, sandstone, silicate minerals, iron powder, and some slag.

These ingredients were mixed and ground into a fine powder to make the cement we see today. Limestone is the cheapest ingredient in cement. When cement is mixed with water, a viscous slurry is formed.

After pouring for a long time, the cement will harden in air or water, which is also the reason why the cement is quietly hardened in a humid environment.

The mixture of early lime and volcanic ash is very similar to modern lime pozzolana cement. Cement crushed stone concrete is not only strong after hardening, but also resistant to the erosion of fresh water or salt water. As an important cementitious material, it is widely used in civil engineering, water conservancy, national defense and other projects.

In order to obtain hydraulic lime, limestone containing clay must be burned; The most ideal composition of masonry mortar for underwater construction is hydraulic lime and volcanic ash.

After crushing these discarded ash blocks, they found that their hydraulic hardness was stronger than that of lime. People call this fly ash "lime plus cement". Around 1800, it was found that the clay content was smaller, about 20%.

The hardness of the cement will be better. The most basic materials used for the production of cement are clay and limestone. Cement production is divided into three stages, two grinding and one firing, raw material grinding, calcareous raw materials, clay raw materials and modified raw materials.

After crushing or drying, it is ground in a certain proportion to make a raw meal with suitable composition and quality.

Clinker calcination, the raw materials are put into the cement kiln and calcined until partially melted, and the cement clinker with calcium silicate as the main component is obtained. For cement grinding, an appropriate amount of gypsum is added, and sometimes other mixed materials are added. The common pattern is cement.

The concrete we buy in the market basically contains the addition of gypsum to speed up the whole setting time. If finished concrete is purchased and chemicals are added, the setting time can be greatly reduced.

The main raw materials of cement are lime only large stone spring signs, clay raw materials, correction of the original mountain rental materials, auxiliary raw materials, etc., these things can be produced according to a certain proportion and water Huo Yun can produce cement.

The main material is limestone. It is very hard and has good viscosity, so it is usually used to make cement, so it will not be a tofu slag process.

The main raw material for the production of cement is actually a stone in the mountain, which is a stone mined in the mountain to hold, and after being crushed, it becomes the cement we want to use after a series of processing.

The raw materials for the production of cement are mainly clinker, gypsum, mixed admixtures, lime, clay raw materials, and auxiliary raw materials.

Hello dear! Glad for your question! The three main characteristics of cement; The characteristics of cement are hardness ratio, fast water absorption, and the advantages of strong shrinkage Portland cement are:

1) High early strength; (2) Fast coagulation and hardening; (3) Good frost resistance. Its disadvantages are: (1) the heat of hydration is high; (2) Poor heat resistance; (3) Poor chemical erosion resistance to acids, alkalis and sulfates; (4) Anti-dissolution ** erosion difference.

The advantages of ordinary Portland cement are: (1) high early strength; (2) Fast coagulation and hardening; (3) Good frost resistance. The disadvantages are:

1) The heat of hydration is high; (2) Poor heat resistance; (3) Poor anti-dissolution corrosion. The advantages of slag cement are: (1) low heat of hydration; (2) In the humid environment, the strength increase rate was greater in the later stage; (3) Good heat resistance; (4) Resistance to sulfate erosion and dissolution is good.

Its disadvantages are: (1) the strength is low in the early stage, and it is more significant at low temperature; (2) Poor frost resistance; (3) The dry shrinkage is large, and there is a phenomenon of water secretion. The advantages of fly ash cement are:

1) The heat of hydration is low; (2) Good resistance to sulfate and dissolution corrosion; (3) Less dry shrinkage; (4) The growth rate of intensity in the later stage is larger. Its disadvantages are: (1) low early strength; (2) Poor heat resistance; (3) Poor frost resistance; (4) Poor carbonization resistance.