Which consumes more electricity, the same amount of cement or pc

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List of contents for this article:

• 1、The difference between p.l and p.ll cement
• 2、Whether the cement production capacity replacement relocation project belongs to the two high and one residual restriction category and cannot be supported by credit
• 3、What is the equivalent substitution method for cement and fly ash
• 4、Which consumes more electricity in the same amount of po cement or pc cement?

The difference between p.l and p.ll cement

1. Differences between p.l and p.ll cement silicate cement is divided into two types, unmixed materials (P·I) and mixed materials (P·II). The chemical indicators of these two types are different for insolubles and loss on ignition. Please refer to the product standard "GB175 -2007 General Purpose Silicate Cement".

2. Portland cement is divided into two types, unmixed material (P·I) and mixed material (P·II). The chemical indicators of these two types are different in terms of insolubles and loss on ignition. Please refer to the product standard "GB175 -2007 General Portland Cement".

3. The P.I and P.II in cement actually represent specific types of portland cement, and they represent different strength levels. P.I. usually refers to ordinary portland cement. Its common code is ordinary cement. The strength grades include 445R, 555R, 65 and 65R. These grades are divided according to the compressive strength of the cement and are used to adapt to the production needs of different strength concrete.

4. P.l. cement is portland cement. There are six varieties of general cement according to national standards, one of which is portland cement, code-named P.I or P.II. Type P.I is not mixed with admixture, and Type P.II is allowed to contain no more than 5% active mineral admixture. P.l cement is a portland cement that belongs to a cement type with better pit freezing properties.

5. pl is a type of portland cement. Five major varieties of cement: 1. Portland cement Pl and PII, 2 ordinary Portland cement PO, 3 pozzolanic Portland cement PP, 4. slag Portland cement PS, 5. fly ash Portland cement PF. (There were once six varieties of cement called, namely, one more composite portland cement PC type, which has now been cancelled).

Whether the cement production capacity replacement relocation project belongs to the two high and one residual restriction category and cannot be supported by credit

Whether cement production capacity replacement relocation projects fall into the "two highs and one surplus" restriction category and cannot obtain credit support requires comprehensive judgment based on the nature of the project and policy guidance. Credit support is not absolutely prohibited. The CBRC clearly requires commercial banks to limit loans to "two high and one surplus" industries, especially new projects to expand production capacity.

However, whether the cement production capacity replacement relocation project can obtain bank support cannot be generalized. The actual situation of the project is one of the key factors. If the project is in line with the guidance of national industrial policies, such as a capacity replacement project that belongs to energy conservation, emission reduction, and technology upgrading, and the project planning is reasonable, the market prospect is good, and has high profitability and repayment ability, then the bank may provide certain financial support after assessing the risks.

The actual impact of policy control: Local governments have become stricter in approving new construction or expansion of asphalt projects, and bank credit policies have also tilted towards restricted industries. Enterprises need to operate in compliance through environmental protection technology transformation or replacement of production capacity indicators. In recent years, some environmentally friendly modified asphalts (such as rubber asphalt) have been removed from the restricted catalog, but traditional petroleum asphalt is still under control.

What is the equivalent substitution method for cement and fly ash

1. That is to say, in concrete added with fly ash, the same amount of fly ash added will subtract so much cement from the original cement.

2. The so-called "equivalent substitution method" is to replace cement in an equal amount. At this time, due to the low activity of fly ash, the strength of concrete in the early and 28-day age decreases. However, as the age increases, the strength of concrete mixed with fly ash can gradually catch up with the benchmark concrete (concrete without fly ash).

3. Equivalent substitution means that fly ash replaces cement in a ratio of 1:1, and excessive substitution is in accordance with the fourth requirement of GBJ146 -90. Provisions for excessive replacement of cement: Class I fly ash: 1-4; Class II fly ash: 3-7; Class III fly ash: 5-0.

4. It means replacing 25% of the cement in the original mix ratio with fly ash, but the substitution relationship is that 3 parts of fly ash replace 1 part of cement.

5. For example, the cement amount per cubic meter of concrete is 400Kg, and the replacement amount of fly ash is 20% of the cement amount, then the replacement amount of cement is 80Kg, and the excess factor of fly ash is 5, then the amount of fly ash is 120Kg. Then the total amount of cementitious materials in each cubic meter of concrete is 440Kg, including 320Kg of cement and 120Kg of fly ash.

Which consumes more electricity in the same amount of po cement or pc cement?

R, 555R six levels. Different chemical indicators require loss on ignition of ordinary portland cement to be ≤0%, but no loss on ignition of composite portland cement is required. Ordinary portland cement (mass fraction) MgO≤0%, if the cement autoclave test is passed, it is allowed to be relaxed to 0%; composite portland cement (mass fraction) MgO≤0%, if it is greater than 0%, cement autoclave stability test and passed.

There are three differences between po cement and pc cement. The doping materials of po cement and pc cement are different. In addition to portland cement, pc material is also doped with other mixed materials, while po cement only uses portland cement. The strengths of po cement and pc cement are different. The strength of po cement is higher than that of pc cement. The strength of po cement is 425 and the strength of pc cement is 325. Po cement and pc cement have different loss on ignition.

At the same time, its MgO (magnesium oxide) content is less than or equal to 0%, if the cement autoclaving test passes, it is allowed to relax to 0%. There is no specific requirement for loss on ignition of pc cement. Its MgO content is less than or equal to 0%, if more than 0%, it is necessary to adopt cement autoclaving stability test and pass, in order to ensure the stability and safety of cement.

For po cement, the loss on ignition is required to be less than or equal to 0%, while for pc cement there is no requirement for loss on ignition. po cement, MgO is less than or equal to 0%. If the cement passes the autoclave test, it is allowed to relax to 0%. pc cement, MgO is less than or equal to 0%. If 0%, cement autoclave stability test is required and passes.

The main differences between pc cement and po cement are as follows: Chemical indicators: pc cement: There is no clear requirement for loss on ignition. po cement: Loss on ignition should be less than or equal to 5%. Type: pc cement: refers to composite portland cement, code number P.C. po cement: refers to ordinary portland cement. Admixture: pc cement: Admixture is about 20% to 50%. po cement: admixture is less than 5%.

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