What do you need to add to foamed cement drowning?

Foamed cement is a lightweight porous material made by adding a chemical foaming agent to the cement slurry, and using the chemical foaming agent to produce gas through chemical reaction, so as to introduce a large number of tiny bubbles into the slurry. It is non-combustible, good thermal insulation, aging resistance, and dimensionally stable, and is an ideal new building insulation material with broad application prospects.

Compared with ordinary concrete and mortar, foamed cement must have a low slurry consistency due to the need for slurry foaming, so the water-cement ratio is large, which is generally around the center. The high water-cement ratio reduces the bond tightness between the cement hydrates, and also leaves a large number of voids and capillary channels inside the specimen, which significantly reduces the performance of the product. The addition of superplasticizer can significantly reduce the water-cement ratio of slurry, which is an effective way to solve the above problems.

However, the superplasticizer generally has a defoaming effect on foamed cement, which will cause damage to its cell structure, and the strength of this damage effect is closely related to the type of superplasticizer. Some types of superplasticizers have weak defoaming effect, while some types of superplasticizers will lead to serious defoaming phenomenon, but reduce the performance of products, so the compatibility with foamed cement system must be studied before using superplasticizers.

1) Among the five types of high-efficiency superplasticizers of naphthalene, melamine, polycarboxylic acid, aliphatic and sulfamate, polycarboxylic acid superplasticizer has the best compatibility with the general silicon foamed cement system, and the water reduction rate is the highest, which is most suitable for use in general silicon foamed cement.

2) After the addition of polycarboxylic acid superplasticizer, the water-cement ratio of the slurry was significantly reduced, so that the structural density of the sample cell wall was significantly improved, and the 28d flexural and compressive strength of the sample were increased respectively, and the mechanical strength of the sample was significantly improved, and the thermal conductivity and volumetric water absorption of the sample were reduced respectively, and the thermal insulation performance and waterproof performance of the sample were improved.

However, the foaming agent is generally concentrated and cannot be directly added to the foaming machine for use, one is too wasteful, and the other is that the concentration is too high to produce high-quality foam. Therefore, only when the concentration is right, a high foaming multiple, high-quality foam will be obtained. So what kind of concentration is appropriate?

Let's introduce the process of foaming machine:

First of all, if the foaming agent has been added to the foaming agent in the manufacturing plant, it must be added separately when preparing the foaming solution. However, if there is no foam stabilizer in the original production plant, and the foam stability is not satisfied when you try it yourself, you can add a certain amount of foam stabilizer when preparing the foaming solution.

Secondly, if the foaming multiple of the foaming agent is small and the foam formation amount is low, a small amount of foaming agent can be added when the foaming solution is prepared. Foaming agent is also a surfactant, which can significantly increase the foaming amount and increase the foaming capacity per unit foaming agent.

In addition, for the storage of foaming liquid, you can choose to seal it in the storage tank for later use, so that good results can be achieved when foaming the cement foaming machine!

Foamed cement is a new type of lightweight thermal insulation material containing a large number of closed pores formed by natural curing by fully foaming the foaming agent through the foaming system of the foaming machine, and mixing the foam with cement slurry evenly, and then carrying out cast-in-place construction or mold forming through the pumping system of the foaming machine. It belongs to the bubble-like thermal insulation material, and the outstanding feature is to form a closed foam hole inside the concrete, so that the concrete is lightweight and insulated.

Foamed cement is a new type of lightweight thermal insulation material containing a large number of closed pores formed by natural curing by fully foaming the foaming agent through the foaming system of the foaming machine, and mixing the foam with cement slurry evenly, and then carrying out cast-in-place construction or mold forming through the pumping system of the foaming machine. It is a bubble-like thermal insulation material, and its outstanding feature is the formation of closed foam pores inside the concrete, which makes the concrete lighter and thermal insulation [1].

Key features: 1) The thermal resistance is about 10-20 times that of ordinary concrete.

2) It is equivalent to about 1 5 1 8 of ordinary cement concrete, which can reduce the overall load of the building.

3) There is no need for boundary gaps and ventilation tubes.

4) The porosity of foamed cement makes it have a low elastic modulus, so that it has a good absorption and dispersion effect on impact loads.

5) Foamed cement contains a large number of independent bubbles, and the distribution is uniform, which is 5 times that of ordinary concrete, and has the function of effective sound insulation.

6) Compressive strength: The compressive strength is.

7) Water resistance: cast-in-place foamed cement has less water absorption, relatively independent closed bubbles and good integrity, so that it has a certain waterproof performance.

8) Durability: the same as the life of the main project.

9) Simple construction: only need to use the cement foaming machine to realize automatic operation, can achieve long-distance transportation with a vertical height of 200 meters, and the workload is 150-300m3 working days.

10) Production and processability: foamed cement can not only be produced into a variety of products in the factory, but also can be constructed on site, directly cast into roofs, floors and walls, and can be sawed, planed, nailed, drilled and other processing.

11) Environmental protection: The raw materials required for foamed cement are cement and foaming agent, and the foaming agent is neutral, which does not contain harmful substances such as benzene and formaldehyde, which avoids environmental pollution and fire hazards.

12) Economy: low comprehensive cost.

Foam concrete is generally added with the following admixtures:

High-efficiency superplasticizer: Polycarboxylate is the latest generation of high-performance superplasticizer, and it has the best performance among various high-efficiency superplasticizers. Its water reduction rate is as high as 30 40, saving cement 25 when keeping the strength unchanged, and can improve the concrete strength more than 30 when keeping the cement consumption unchanged.

Coagulant: coagulant is an admixture that can make concrete quickly set and harden, after the coagulant is mixed into the concrete, it can make the concrete initially set within 5min and finally set within 1omin. The strength can be produced in 1h, and the LD strength is increased by 2 3 times, but the strength will decrease in the later stage, and the 28D intensity is about 80 90 when it is not mixed.

Foaming agent: The quality of traditional foaming agent directly affects the quality of foam concrete, and there are many substances that can produce foam, but not all substances that can produce foam can be used in the production of foam concrete. Only the foaming agent with a large enough foaming multiple, the film will not be damaged when the foam and slurry are mixed, has sufficient stability, and has no harmful effect on the coagulation and hardening of the cementitious material, is suitable for the production of foam concrete.

You can use 7 blowing agents, and you can go to the magnesite technology network to see the specifics.

325 425 is OK, the main thing is to choose a good foam stabilizer, it is recommended to use the foam stabilizer mother liquor FL-6

Because there are many types of rubber powder, different rubber powder properties and functions are different, probably have the following effects:

1. Because the water absorption rate of foam concrete (not called foamed cement, but also called foam mortar) is high, adding rubber powder can increase the waterproof performance;

2. In order to reduce water loss and shrinkage, rubber powder can play a role in water retention;

3. The rubber powder can increase the bond strength with the base layer;

4. Rubber powder can increase the anti-dismantling performance and reduce cracking;

Dear, I'm inquiring for you here, please wait a while, I'll reply to you right away Dear, I'm glad to answer for you. 1.Cement as the main body:

It is mixed with permeation crystals in cement to become cement-based permeation crystals, which can be used for backwater waterproofing; 2.Cement as admixture: Cement can be put into a polymer emulsion, and after mixing, it becomes a polymer cement waterproof coating, which can be used for waterproofing in kitchens and bathrooms.

1. What is cement mortar 1. The mixture of cement, sand and water is called cement mortar. The commonly said 1:3 cement mortar is made with 1 part cement and 3 parts sand, which actually ignores the composition of water, and is generally in the left and right ratio, that is, it should become 1:

3: The density of cement mortar is 2000kg m3In construction projects, one is the foundation and wall masonry, which is used as a binder for block masonry materials, such as cement mortar for masonry and red bricks; The second is for indoor and outdoor plastering.

1. Cement as the main body: mixed with permeable crystals in cement to become cement-based permeable crystals, which can be used for waterproofing on the back water surface, and is usually used more in toilets, kitchens and other places that prevent seepage.

2. Cement as admixture: cement can act together with polymer emulsion to release water, and cement can be put into polymer emulsion and become polymer cement waterproof coating after full stirring, which is usually used for waterproofing in kitchens and bathrooms.

Polypropylene fibers are optional.

Polypropylene fiber is a kind of concrete fiber product used for concrete crack resistance and impermeability. The role of polypropylene fibers:

1. Polypropylene fiber can significantly extend the service life of concrete products.

2. Improve the ability of products to resist cracking, seepage and impact wear.

3. Enhance the meshing degree and physical contact force with concrete, reduce the non-structural cracks caused by various plastic shrinkage, segregation, hydration heat temperature and other factors, and improve the impermeability and impact resistance, which has played a great role, and the volume content, crack resistance can be increased by 70, and the impermeability can be increased by more than 60.

4. Increase the toughness of cement mortar and concrete, improve the intrinsic quality of cement mortar and concrete, reduce maintenance costs, and meet the needs of pouring and construction through unique surface treatment technology.

The most important aspect of foaming is to control the ratio of gas to liquid. If the high-pressure air enters too much, there is more gas and less water, and the foam volume is very small, that is, it cannot form a liquid film, and the air cannot be surrounded by the foaming liquid film, and the foaming rate is low. If the foaming liquid enters the machine too much, there is more water and less gas, the emulsion will be formed, the foam is unqualified, the foaming liquid is wasted, and the foam output is low.

The right ratio of the two is the key to successful foaming.

Adjusting this ratio can be operated manually or fully automatically controlled by computer. Manual control is adopted, the process is simple, but the human factor is large, and the control is not sensitive and accurate; Fully automatic computer control, equipment investment increases, but not affected by human factors, accurate proportion, good foaming effect and high efficiency. When foaming, it is necessary to control the foam quality, which can be controlled by adjusting the foaming mechanism1 (except for special needs):

The foam is uniform and consistent, avoiding large and small; In addition, it is necessary to prevent the appearance of emulsions with more water and less gas, and reduce the rate of water secretion.

Attention should be paid to the treatment of foaming liquid. It is necessary to determine the specific ratio to ensure the quality of the finished product to avoid serious losses.

The strange talk test asked unexpectedly, and the head of the eggplant was cute.