**6. Production of foam concrete on the basis of the stabilized foam in industrial conditions**

The results obtained by our group were tested in the industrial conditions in accordance with the technological specifications for the production of foam concrete by cutting technology. In this technology the cutting process begins when a foam concrete mass develops a certain cutting strength. The time of cutting strength attainment can be 17–20 h depending on the composition of the foam concrete. To reduce the time of this technological stage is important from an economic point of view besides that it can improve the productivity of the enterprise.

The studies of samples obtained on the basis of the foam stabilized with SiO2 sol in production conditions also showed that the foam was not destroyed by the introduction of NaCl additives. The compressive strength of foam concrete products increases up to 38%, and the coefficient of thermal conductivity decreases and

*The Improvement of the Quality of Construction Foam and Non-Autoclave Foam Concrete… DOI: http://dx.doi.org/10.5772/intechopen.88234*

corresponds to the foam concrete the class of which is one class lower by the average density. At the same time, the duration of the cutting strength attainment reduces by 7 hours, which significantly speeds up the technological process.

In addition, the shrinkage value of the foam concrete samples was estimated in drying. It was stated to decrease by 18% compared to the control sample, as shown in **Table 9**.


### **Table 9.**

**Figures 12** and **13** show the distribution of large pores according to their size for the foam concrete samples of average density D600; the study was conducted by

*The distribution of macropores according to their size for the foam concrete sample on the basis of foam*

As it can be seen from the figures, the peak of the pore distribution according to their size in the case of a foam concrete sample based on a stabilized foam is shifted toward a smaller pore diameter (Dav = 520 μm). The number of such pores is 18%, the half-width of the peak is 0.44 mm. For the control sample, the peak corresponds to Dav = 600 μm, the number of pores of the average diameter is 15%, and the half-

Thus, it can be concluded that the stabilization of foam with SiO2 sol influences both the micro- and macropores of foam concrete. This increase in the foam concrete pore dispersion during the stabilization of foam explains the decrease in its

**6. Production of foam concrete on the basis of the stabilized foam in**

The results obtained by our group were tested in the industrial conditions in accordance with the technological specifications for the production of foam concrete by cutting technology. In this technology the cutting process begins when a foam concrete mass develops a certain cutting strength. The time of cutting strength attainment can be 17–20 h depending on the composition of the foam concrete. To reduce the time of this technological stage is important from an economic point of view besides that it can improve the productivity of the

The studies of samples obtained on the basis of the foam stabilized with SiO2 sol

in production conditions also showed that the foam was not destroyed by the introduction of NaCl additives. The compressive strength of foam concrete products increases up to 38%, and the coefficient of thermal conductivity decreases and

means of the electron microscopy.

**Figure 13.**

*stabilized with SiO2 sol.*

*Foams - Emerging Technologies*

width of the peak is 0.52 mm.

thermal conductivity (**Table 5**).

**industrial conditions**

enterprise.

**118**

*Physical and technical characteristics of industrial samples of non-autoclaved foam concrete of average density D500.*

### **Figure 14.**

*The number of concrete products of the first quality category: (1) control products, (2) products based on the stabilized foam and NaCl additives.*

**Figure 15.** *Foam concrete products based on the stabilized foam and NaCl additives.*

**Figure 14** shows the number of foam concrete products of the first quality category which increases by 23% compared to the control products made of foam concrete. These figures confirmed the earlier assumptions.

The quality category of products was evaluated in accordance with the specifications (GOST 21520-89). According to its requirements for the blocks of the first quality category the limit deviations in height can be 1 mm, in length, thickness and deviation from the rectangular shape it can be 2 mm. Damage to the corners on one block with a depth of no more than 5 mm, damage to the ribs on one block with a total length of no more than twice the length of the longitudinal edge and a depth of no more than 5 mm are limited by the specifications.

**Figure 15** shows the industrial samples of foam concrete products of average density D500.
