Mineral Wool Composite With the Use of Saponite-Containing Mining Industry Waste

Abstract

<jats:p>the paper shows the possibility of producing a thermal insulating composite based on basalt fibers and sapo-nite-containing mining waste. A method for manufacturing thermal insulating composites from hydro-mass with different contents of the mixture components is proposed. Basalt fibers were used as a filler, and pre-mechanoactivated saponite-containing material (SCM) was used as a binder. It was found experimentally that depending on the composition of composites, the coefficient of thermal conductivity varies from 0.1109 to 0.1342 W/(m•K), and the compressive strength – from 0.45 to 0.93 MPa. In addition, it was found that thermal modification of composites at temperatures up to 1200°C significantly (up to 3 times) increases the compressive strength of composites, while not affecting the coefficient of thermal conductivity. The ex-periments to determine the conductivity of the composite “basalt fiber – SСM” depending on its moisture content showed that the obtained composite is characterized by intense and linear increase in the values of conductivity when the humidity of the sample to 12% and further increase in humidity practically does not change the values of the coefficient of thermal conductivity. Comparison of the studied thermal insulation composite with known structural thermal insulation materials in terms of its thermal insulation and strength characteristics showed that it is comparable to gas and foam blocks. It should also be noted that this material is environmentally safe and can withstand high temperatures without collapsing.</jats:p>

Design Strategy for Recycled Aggregate Concrete: A Review of Status and Future Perspectives

“…In addition, RCA concrete with high levels of cement tends to achieve greater mechanical strength to compression and traction. On the other hand, RCA concretes in environmental curing present strength problems when compared to NCA lengths, thus concluding that the curing condition has a significant influence on all types of concretes (RCA and NCA) [94][95][96]. Moreover, the water-cured RCA concrete carbonation depth is virtually double than those of concretes of air-cured RCAs.…”

Effect of an Aluminosilicate Disperse Additive on Behaviors of Autoclave Silicate Materials

“…The classical technology for the production of autoclave-hardened products provides for the use of lime and silica-containing raw materials as the main components, as a result of the interaction during which the formation of calcium hydrosilicates of various basicity [2] occurs in hydrothermal conditions at elevated pressure. However, the depletion of "pure" quartz raw materials (sands) [3,4], as well as the formation of significant volumes of technogenic waste [5,6], including waste from crushing rocks of various compositions, sets the task of expanding the spectrum of raw materials used [7]. At the same time, due to the significant activation of raw materials under hydrothermal conditions, autoclave technology allows the use of raw materials even with a low quartz content [8,9].…”