This study evaluates the alkali activation of a binary system composed sugar cane bagasse ash and carbide lime as green stabilization technique for bauxite tailings (BTs). To analyze feasibility this alternative binder stabilizer, mechanical tests were performed to measure strength, stiffness, durability BT mixtures. As control group, stabilized with high-initial-strength portland cement (Type III). The results show that is suitable option improve behavior tailings. porosity/binder index...

Portland cement production is an energy-intensive process, and more sustainable substitutes are needed, e.g., alkali-activated binders originated from industrial wastes. Thus, this paper analyzes the combination of sugarcane bagasse ash (SCBA) hydrated eggshell lime (HEL) as precursors for binary system, a combination, to our best knowledge, not studied in past research. The mechanical microstructural behavior SCBA-HEL pastes has been discussed through unconfined strength tests, x-ray...

This study evaluated the stabilization of iron ore tailings (IOTs) with an alkali-activated binder (AAB) produced from sugar cane bagasse ash, hydrated eggshell lime, and sodium hydroxide solution. Unconfined compressive strength, split tensile initial shear stiffness, mineralogy, chemical composition, microstructure IOTs-AAB were evaluated. Strength values up to 6.59 MPa achieved after 28 days-curing at 40 °C. Reducing porosity increasing content improved overall mechanical behavior....

Effective binders with low environmental impacts are of great importance for sustainable engineering practices. Parameters controlling loss mass and stiffness degradation 'green' stabilised bauxite tailings (BT) were evaluated. The porosity/binder index (η/Biv) was investigated. This allows unification all experiments in a single relation specimen's porosity binder content, resulting rational dosage methodology any soil–binder blend, replacing conventional (trial error) strategies that...

This study evaluates the use of rice husk ash (RHA)-eggshell lime (ESL) and RHA-commercial (CL) as alternative binders for clayey soil stabilization, well performance soil-binder mixtures under acidic attack. A central composite design was carried out to analyze reactivity by batch tests with a sulfuric acid solution. Physical mechanical behavior evaluated compaction test unconfined compressive strength (UCS). Reactivity demonstrated better neutralization contaminant acidity ESL. The highest...

An alternative to conventional methods for mine tailings disposal is stabilization with alkali-activated binders (AABs), developed from agro-industrial waste. Despite increasing interest in this topic, there still a lack of studies focusing on the iron ore (IOTs) using AABs, particularly those that combine characterization cementitious gels an evaluation leaching behavior. This study assessed strength, mineralogy, and performance IOTs stabilized AABs formulated rice husk ash (RHA) hydrated...

The present study makes three contributions to the literature of expansive soils: (i) it proposes equations predict soil swelling based on dry density and cement content, (ii) checks developed general equation by predicting different soils from literature, (iii) designs experiments that investigate factors have a significant influence swelling. An experimental programme was carried out analyse expansion bentonite–kaolin–cement blends. Different proportions bentonite–kaolin, density, moisture...

Water treatment plants (WTPs) produce thousands of tons sludge annually, which is destined for landfill disposal, an environmentally and economically impractical alternative. Chemical, mineralogical, morphological characterization besides environmental classification has been performed WTP it was evaluated application potential in building materials, from a literature review. The carried out by X-ray fluorescence spectrometry, diffraction, scanning electron microscopy analysis, leaching...

A geração e a disposição de resíduos oriundos da fundição metais despertam necessidade alternativas que promovam seu melhor reaproveitamento em processos produtivos. Assim, este estudo realizou caracterização química, mineralógica granulométrica ferro cinzento nodular avaliou sua aplicabilidade na construção civil. areia verde, escória material particulado apresentaram composição química presença majoritária dióxido silício (SiO2), além óxido alumínio (Al2O3), potássio (K2O) (Fe2O3). análise...

The present study examined the influence of Hydroelectric Power Plant (HPP) Passo Fundo dam lake on local rainfall pattern. Daily data were obtained from National Water Agency for two different periods: prior to filling, 1960-1970 (pre-filling) and later 1971-1981 (post-filling). Statistical measures (mean, maximum, minimum, standard deviation coefficient variation) Student’s t-test applied both periods regarding monthly total. Student's was also days with cumulative greater than 1 mm, 10 20...

Inadequate disposal of hazardous waste results risks to the environment and human health. Although use in new processes and/or products has received limited attention literature, there is still significant potential be investigated. Reducing usage natural resources management are important for sustainable practices during concrete production. This study investigated mechanical leaching behavior paint booth (PBW) as a partial substitute (10, 20, 30 40%) coarse aggregate mixtures manufacture...

Expansive soils can cause large-scale damage to the infrastructure. Soil stabilization with Portland cement and lime has been widely utilized as a solution this problem. However, these stabilizers are non-renewable energy-intensive. Alkali-activated binders alternatives lower carbon dioxide emissions. This research evaluated an expansive soil alkali-activated binder produced from sugarcane bagasse ash (SCBA), hydrated eggshell (HEL) sodium hydroxide (NaOH). Free-swelling tests alongside...