In the production of crushed stone, lithoidal pumice and perlite sand, it is advisable to separate and segregate the obsidian. Wherein, the separated obsidian is converted into production waste. By the expansion of obsidian it is possible to obtain an ultralight large grain porous material and thereby solve environmental issues - to dispose of waste products. The expansion of volcanic glass (obsidian) occurs due to gases, primary (magmatic) and secondary (hydraulic) water, which is located in the pores. During the expansion, under heat treatment, the gases expand about 4 ... 5 times in the pores, which contributes the expansion. Expanded obsidian can be used as a filler for lightweight concrete. Obsidian is expanded at temperatures of 1050-115°C. The lowest average density of 200 - 350 kg / m3 (in a piece) is obtained by heat treatment of obsidian with a particle size of 5 to 20 mm for a duration of 3-10 minutes. Depending on the requirements for lightweight aggregates, by adjusting the firing temperature and duration, it is possible to obtain expanded obsidian with the necessary physical and mechanical properties. It is revealed that more durable concretes are obtained with cement consumption of 350 ... 380 kg. Depending on the average density of lightweight concrete 400 .. 1350 kg/m3, the compressive strength is 0.2 ... 16,9 MPa. Light monolithic products with improved characteristics of heat resistance and thermistance, having an average density of 180-200 kg/m3, compressive strength of 1.2–1.5 MPa, frost resistance of 25 cycles, after which the strength changes to 1.0–1.3 MPa, heat resistance to 800–850°C, and thermistance to 600–650°C. By the thermal conductivity coefficient determination it was possible to reveal that in the temperature range of 20-60°C, the thermal conductivity coefficient changes by 0.002 W/mK, i.e. from 0.044 to 0.046 w/mK. Thus, the obtained monolithic blocks can be very successfully used as heat-insulating materials, which will retain their properties throughout the operation of the facilities. The requirements for mechanical strength and decorative properties for sound-absorbing materials compared to thermal insulating materials are higher, since they are used for internal linings. Thus, the obtained monolithic blocks can be very successfully used as heat-insulating materials, which will retain their properties throughout the operation of the facilities.

In modern conditions, one of the ways allowing the construction company to be competitive in the market is the use of modern high – quality and, at the same time, cheaper building materials. Many technogenic formations, in particular solid waste are valuable technological raw materials and can be involved in technological redistribution in order to obtain composite building materials. In the production of crushed stone, sands from lithoid pumice and perlite, it is advisable to produce separation and separate obsidian. In this case, the separated obsidian turns into production waste. The expantion of obsidian will allow to obtain a large porous ultralight material and thereby solve environmental issues – recycle production waste. On the base of expanded obsidian, it is possible to obtain new types of effective composite thermal insulation and acoustic materials (cellular concretes and acoustic plasters), which have high performance properties and expand the range of effective building composite materials.

Increasing attention is paid to noise control and provision of the required acoustic comfort. This is due to an increase in the noise of the environment, the concentration of people in the cities, development of industry, transport and aviation. Currently, mass construction does not have the necessary number of sound-proof products and this demand is constantly increasing. Therefore, the development of new efficient sound-proof products, especially on the base of industrial waste, is of particular importance. While separating obsidian during the production of rubble and sand from lithoid pumice and perlite - it turns into a waste product. With the expansion of obsidian with grain sizes from 5 to 20 mm in a duration of 3-10 minutes at temperatures from 1050 to 11500С, it is possible to obtain a lightweight porous material with the lowest average density of 200–350 kg/m3 (in a piece of stone) and thereby solve environmental issues - to recycle production wastes. The requirements for mechanical strength and decorativeness of sound-absorbing materials are increased, since they are used for tiling internal walls, so they must have low water absorption capacity, low hygroscopicity, and be fire and bio resistant. On the base of expanded obsidian, it is possible to obtain acoustic materials: cellular concrete and plasters with cement and gypsum with an average bending strength of 2.229 and 5.679, and 6.2095 and 12.670 MPa for compression.