**Author details**

**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

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

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

1.For the first time it is proposed to use SiO2 and Fe(OH)3 sols to stabilize the construction foam on a protein basis in order to obtain high-quality non-

2. It is shown that the stability of the foam stabilized with SiO2 and Fe(OH)3 sols increases up to four times and the coefficient of resistance of the foam in the

3.The method of IR Fourier spectroscopy shows that the mechanism of the foam stabilization is connected with the formation of various chemical bonds between the molecules of the protein foaming agent and sols: hydrogenous in

4. It is established that the new chemical bonds result in the formation of spatial stabilizing complexes in the foam film. This leads to an increase in its thickness

conductivity coefficient 0.04 W/(m∙°C) was obtained on the basis of the foam

the case of using SiO2 sol and covalent in the case of Fe(OH)3 sol.

5.Heat-insulating foam concrete of average density D200 with thermal

6.On the basis of the foam stabilized with SiO2 and Fe(OH)3 sols and NaCl additive, high-quality foam concrete of medium density D400–D600 was obtained. Compressive strength increases up to 50%, tensile strength in bending increases up to 69%, shrinkage in drying decreases by 18%, the coefficient of thermal conductivity decreases by 16%, and frost resistance

7.Studies of the porous structure of foam concrete based on the stabilized foam have shown that the specific surface area of the pores increases twice and the

8. Industrial testing of the developed foam concrete of the average density D500 has been made. The use of the foam stabilized with SiO2 sol and the additive of

NaCl in its composition allows to reduce the time of cutting strength attainment by 7 hours and to increase the number of products of the first

by one order, which is confirmed by electron microscopy.

average pore diameter decreases from 600 to 520 μm.

concrete. These figures confirmed the earlier assumptions.

depth of no more than 5 mm are limited by the specifications.

density D500.

**7. Conclusions**

*Foams - Emerging Technologies*

autoclaved foam concrete.

stabilized with SiO2 sol.

increases by 20 cycles.

quality category by 23%.

**120**

cement paste increases from 0.9 to 0.98.

Anastasia Sychova<sup>1</sup> \*, Larisa Svatovskaya<sup>2</sup> and Maxim Sychov<sup>3</sup>

1 Military Space Academy named after A.F. Mozhaisky, St. Petersburg, Russia

2 Department of "Engineering Chemistry and Natural Science", Emperor Alexander I St. Petersburg State Transport University, St. Petersburg, Russia

3 Department of Materials Science, Saint-Petersburg State Institute of Technology, St. Petersburg, Russia

\*Address all correspondence to: amsychova@yandex.ru

© 2019 The Author(s). Licensee IntechOpen. This chapter is distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/ by/3.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
