Does the powder affect the construction of foam concrete ?

The influence of the powder on the function of the foam concrete was studied. The cooperation ratio of the powder was the same as that of the foamed concrete. The content of the powder was 0 ~ 0.50% and the dosage of the powder was gradually increased by 0.05%. What is the specific effect of powder on foam concrete?

At present, fixed water to material ratio, filler and other chemical admixture, in 0 ~ 0.5% change between the powder content. There is no significant change in the compressive strength of the foamed concrete at 7 days. This may be due to the fact that the hardened concrete specimen is also rich in moisture during 7 days, resulting in the formation of the film. The compressive strength of 28d did not increase with the increase of the powder, and the change was not significant when the dosage of powder was less than 0.3%.

When the content of powder was changed from 0.3% to 0.4%, the compressive strength increased sharply at 28 hours, and the compressive strength appeared a peak when the content of powder was 0.4%, then the steep trend appeared. This should be associated with the film formation of the powder, followed by the increase in the amount of powder, the film formation is gradually lacking and continuous, and cement hydration of goods linked to each other to form a network structure, the foam inside the concrete The pores play a certain filling and sealing effect, and then make the compressive strength of foam concrete has increased.

There was no significant change in the flexural strength of the foamed concrete at 7 o'clock, perhaps due to the fact that the hardened concrete test block was also rich in moisture so that the powder had not yet become completely formed. The flexural strength of 28 hours increased sharply with the increase of powder, and the flexural strength was a peak when the content of powder was 0.4%, then decreased. This should be associated with the film formation of the powder, followed by the increase in the amount of powder, the film formation gradually continuous, and cement hydrated goods linked to each other to form a network structure, the foam inside the pores It will be able to improve the internal structure of the material, and the "bridge" effect of the high flexibility of the powder, so that the internal structure of the concrete is more continuous and compact, and the microstructure is increased. When the powder content is greater than 0.4%, the bending strength is reduced, which may be in the case of the same water ratio, due to the powder content is too large, the slurry consistency is large, the powder in the concrete Uneven, perhaps constitute a powder meeting, so that can not constitute a continuous film.

Fixed water to material ratio, filler and other chemical admixture, in 0 ~ 0.5% change between the powder content. There is no significant change in the compressive strength of the foamed concrete 7, which may be due to the fact that the hardened concrete test block is also rich in moisture so that the powder has not yet become completely formed. 28 hours compressive strength is not with the increase in powder and a slight increase in the powder content of less than 0.3%, the slow increase, the change is not significant.

The cement slurry or cement mortar and foam after mixing, with different treatment methods hardened successful artificial stone, which has a uniform distribution of closed small air bubbles, thus forming a porous structure, called foam concrete. The main difference between this material and the cement concrete is that the cement concrete lacks this porous structure.

Porous structure to the foam concrete has brought many excellent features: such as light weight, small thermal conductivity and high frost resistance, are building on the very valuable performance.

The production process of foam concrete construction is not complicated. Simply put, as long as the cement slurry or cement mortar and foam in the mixer and then mix, and then like watering ordinary concrete, watering in the mold, after hardening treatment, you can get a variety of concrete products.