Nestor Tupa

UNIVERSIDAD NACIONAL DE SAN AGUSTIN DE AREQUIPA · INGENIERIA CIVIL

This work presented 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. As the primary activator solution, a sodium hydroxide (NaOH) solution at 10 M was used. Calcium-hydrolyzed nanoparticles with a particle size of 10 nm...

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...

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...

Tese (doutorado)—Universidade de Brasília, Faculdade de Tecnologia, Departamento de Engenharia Civil e Ambiental, 2006. Nas últimas décadas, o uso dos materiais geossintéticos como reforço das obras geotécnicas tem aumentado muito, ampliando os âmbitos de suas aplicações. Essa técnica apresenta grande potencial para uso em obras de segurança e mini...

Soil reinforcement is a well-established technique for works such as embankments, steep slopes and walls. This paper presents the results of a study on an innovative use of geosynthetic reinforcement for the protection of buried pressurised pipes. The collapse of a pipe inside reinforced and unreinforced sand was simulated in models studies in the...

This paper presents the results of a study on the use of geosynthetic reinforced embankments for the protection of buried pressurised pipes by means of laboratory tests. The expansion of a pipe inside reinforced and unreinforced sand was simulated in models studies in the laboratory using a large rigid steel tank. Different types and configurations...

This paper presents a study on the behaviour of non woven geotextiles under tension confined by fine grained soils. A preliminary numerical analysis of the test is also discussed. The results suggest that fine grained soils may provide high levels of confinement and that arching can occur causing the vertical pressure on the geotextile during the t...

This paper presents the results of direct shear tests to study the interaction between soils and geosynthetics and to evaluate interface frictional parameters between geosynthetics and fine grained soils and between different types of Brazilian geosynthetics. Friction reducing materials commonly present in soils were mixed to the soils used in the...