Research in the field of using of ash from the incineration of sewage sludge, treated with mineral binders, for forest road construction

Abstract

The purpose of the study is to obtain a durable and cheap road-building material based on ash, reinforced with mineral astringent. Within the framework of the research, the optimal dosages of binders were searched for, the characteristics of the strength of mixture of ash with sludge and ash with cement were also determined. A comparative analysis of the economic efficiency between using a mixture of ash from the incineration of sewage sludge, reinforced with nepheline sludge, and traditional road building materials was carried out. The results of the study of mixtures of ash with mineral binders, such as nepheline sludge and cement, show that the obtained materials have high strength indicators and high indicators of the modulus of elasticity. They can be attributed to strength grades from M20 to M100. The developed building material (ash mixed with binders (nepheline sludge, cement)) could replace a similar building material in the technology of road construction, because if this mixture is taken in optimal dosages, it will be more profitable in the process of use, both from the point of physical and mechanical views, and point of view of economic indicators.

Utilization of silt, sludge, and industrial waste residues in building materials: A review

“…For sludge, as mentioned above, the content of solid precipitation material, organic matter or metal and other harmful substances produced by the sewage treatment process is relatively high, and the application in roadbed materials is mainly realized by adding curing agents such as cement and fly ash. 58 For example, Zubova et al 59 added incineration ash to nepheline sludge. When the ratio of nepheline sludge and ash is 3:7, nepheline sludge acts as an activator for ion exchange reaction and has the highest strength and elastic modulus (reaching 6.2 and 183 MPa, respectively, Figure 6(a)).…”

“…Mechanical properties of solidified/stabilized sludge. (a)The tensile strength and elastic modulus at a 3:7 ratio of nepheline sludge to ash 59. (b) The unconfined compressive strength of the solidified/stabilized sludge of gypsum and framework materials,55 where C stands for Cement, L stands for Quicklime, and B stands for Gypsum.…”