Processes of structure formation and neoformation of basalt fiber in an alkaline environment

Abstract

Several approaches can be used to determine the effect of an alkaline environment on glass materials (basalt fibers). One of the most common approaches for the determination of the alkali resistance of a substance is to measure the relative mass loss after the interaction of the object of research with the alkaline environment. According to the practice guidelines, the approach involves determining the alkali resistance of a glass by measuring the mass loss per unit area of the glass under test after boiling it in an alkaline solution. But the disadvantage of this approach is it can’t be applied to basalt or another multicomponent fiberglass as it doesn’t introduce different speeds of fiber dissolution.

Establishing patterns of heat transfer to timber through a protective structure

“…An unprotected timber sample was found to be capable of igniting and spreading flames around the surface after ignition, causing the structure to collapse [1,2]. The use of heat-insulating materials makes it possible to slow down the warming of the material and to retain its functions in case of a fire for a specified period but requires considerable costs [3,4]. In addition, the temperature of separate combustive substances by far exceeds the hydrocarbon flame [5].…”

Ways to increase the production efficiency of hardwood blanks

“…Conditions (4-6) are based on the parameters: equipment (devices), ΔT ୰ୣୱ ; products, C ୬୭୧ୱୣ ; heating, T ୟୠୱ ; defects, ߂ܶ or ‫.ܥ‬ Thus, in order to establish the most effective method of industrial wood thermal stimulation of oak wood initial moisture, we determined the signal-to-noise ratio criterion, S, using equations (1-2) and verified the fulfillment of conditions (3)(4)(5)(6), for which a number of experimental studies were performed. For the experiment, uncut industrial wood from oak timber was selected in an amount of 720 pieces with an average initial moisture content (40…50%), an actual thickness of 30 mm and a length of 1.7 m. Fig.…”

“…Production of high-quality materials, determination of their properties today special attention is paid [1][2][3][4][5][6]. The full technological cycle is characteristic feature of the production of hardwood timber blanks in Ukraine -from round timber to finished intermediate products of final moisture content, since the manufacturing of such products from industrial wood is low cost-effective.…”

Design of slag cement, activated by Na (K) salts of strong acids, for concrete reinforced with steel fittings

“…That forms a binding system known as the alkaline-activated slag cement. The alkaline activation of aluminosilicate raw materials is widely used in the production of modern building materials [11]. Concrete based on the alkaline-activated types of cement is characterized by the increased indicators of strength [12], heat resistance [13], corrosion resistance [14], sulfate resistance [15], frost resistance [16], water resistance [17], compared to analogs based on conventional clinker concrete.…”