Héctor Gelber Bolaños Sosa

National University of Saint Augustine | UNSA

Converting mine tailings rich in aluminum oxide and silicon dioxide into a geopolymer using an alkali activator offers an eco-friendly solution for mitigating the environmental impact of mine tailings and reducing associated disposal costs. In the realm of construction materials, thorough investigations into the mechanical properties of geopolymers...

Over 14 billion tons of mine tailings are produced throughout the world each year, and this type of waste is generally stored onsite indefinitely. Alkali activation is a promising strategy for the reuse of mine tailings to produce construction materials, converting this waste stream into a value-added product. One major problem with alkali-activate...

This work presents the production and incorporation of calcium hydrolyzed nano-solutions at three concentrations (1, 2, and 3 wt.%) in alkali-activated gold mine tailings (MTs) from Arequipa, Perú. A first activator solution of sodium hydroxide (NaOH) at 10M was used. The calcium hy-drolyzed nano-solutions acted as a secondary activator and as addi...

Mine tailings are man-made soils and leftovers from the mineral processing that share the similar geotechnical properties with natural soils. In areas with abundant mineral reserves and developed mining industries, tailings could be utilized as an alternative of natural soils for subgrade materials of pavement and adobes for building and constructi...

This paper deals with the acquisition of the crack evolution and propagation behaviors of the compacted tailing soils from full-field displacement fields by incorporating two-dimensional optical technique-digital image correlation (2D DIC). Meanwhile, the fracture properties, such as mode I+II fracture toughness were also measured and compared to t...

Beneficiation of industrial wastes, such as mine tailings (MTs), through development of alternative eco-friendly geopolymer binders for construction composites offers a twofold environmental benefit, as it reduces the demand for cement and it increases the sustainability of industrial processes by creating a value-added product from an industrial b...

As a potential alternative of Portland cement concrete for construction and building applications, solid-like geopolymer made by alkali-activation of the mine tailings (MTs) that shares the similar brittle properties with rocks and concrete. However, the pure MTs did not have sufficient amorphous aluminosilicates for better alkali activation. It is...

This paper presents an investigation on the durability and leaching behavior of gold MTs-based geopolymer by conducting a series of experiments that included uniaxial compressive tests (UCT) and static monolithic leaching tests, considering submersion into three different reagent solutions: deionized (DI) water, salty water, and acidic water to mim...

Mine tailings (MTs) that are rich in aluminosilicates can be reused to create geopolymer via alkaline activation as an alternative to Portland cement concrete for construction and building applications. However, pure MTs may lack sufficient aluminum or amorphous aluminosilicates to facilitate geopolymerization that competes with traditional concret...

Mine tailings (MTs) are ore residuals after valuable metals were extracted during mineral processing, which can be reused to produce the geopolymer concrete for construction and building applications, to mitigate the storage, economic, and environmental pressures. However, the pure MTs did not have enough reactive aluminum or amorphous aluminosilic...

The storage and handling of mine tailings (MTs) pose significant economic and environmental problems and finding suitable recycling or re-use alternatives for MTs is an on-going process. One of those alternatives is creating MTs-based adobes or compacted MTs, which then can be used in construction materials and ground stabilization applications The...

Cyanide (CN−) from gold processing effluents must be removed to protect human health and the environment. Reducing the use of chemical reagents is desirable for small centralized and decentralized facilities. In this work, we aimed to optimize the use of ultraviolet (UV) radiation coupled with hydrogen peroxide (H2O2) to enhance the rate and extent...

Sustainably reusing mine tailings and reducing the economic costs of storing them is an ongoing concern in the geomechanics field. This paper discusses the process of utilizing MTs in the manufacture of geopolymer through alkaline activation. Since geopolymer is subjected to various external and internal loading conditions that could result in fail...

Mine tailings-based geopolymer was proved to be successfully created with enhanced strength for potentially construction and building materials applications. Through geopolymerization, the mining wastes can be reused and the storage, economic, and environmental issues can be mitigated. However, the geopolymerization effect was relatively limited co...

Ore beneficiation processes produce an enormous number of tailings. For dispersed remote artisanal mining sites that are unapproachable to strong construction and building materials, compacted MTs can be an alternative to construct civilian buildings. The mechanical behaviors of compacted clay and adobe masonry were studied by numerous researchers;...

The particle morphological properties, such as sphericity, concavity and convexity, of a granular assembly significantly affect its macro- and micro-scopic compressive behaviors under isotropic loading condition. However, limited studies on investigating the microscopic behavior of the granular assembly with real particle shapes under isotropic com...

Mine tailings (MTs) with rich aluminosilicates can be successfully used in the production of geopolymer via alkaline activation; and MTs, through geopolymerization are being used as an alternative in pavement and building construction materials, including concrete and bricks. Besides the factors such as the Si:Al ratio, Si/Al: NaOH ratio, and solid...

Geopolymerized mine tailings (MTs), as an alternative to reuse the mine wastes, can be used for construction materials (e.g., geopolymer concrete and bricks) depending on their mechanical properties. Their strength values, which can range from a couple of MPa to tens of MPa, are significant evidence for their application in the construction industr...

Mine tailings that are rich in aluminosilicates can be activated and converted to geopolymers to develop building and construction materials, such as geopolymer concretes and bricks. Geopolymer can be widely used in retaining structures, building constructions, and pavement structures. However, due to the disturbances derived from external loads an...

Se comunica el caso de gestante de 22 años, controlada en la consulta de alto riesgo por diagnóstico de feocromocitoma, con control adecuado de las cifras de tensión arterial. Se realizó cesárea segmentaria más adrenalectomía a las 35 semanas; durante el acto operatorio presentó crisis hipertensiva de difícil manejo, por lo cual, se difirió la adre...

The Upper Member of the Agrio Formation and the Chorreado and Lower Troncoso Members of the Huitrín Formation (Early Cretaceous) are three of the main hydrocarbon producing units at the Puesto Hernández Field in the Neuquén Basin. Reservoirs, composed of clastic units with some calcareous components, are associated with litoral sandstones and congl...