The present research aims to evaluate the potential of combining two wastes, finely ground waste glass (GWG) and carbide lime (CL), together with a sodium hydroxide solution (SHS) to form a...

Mechanical Properties of Alkali-Activated Ground Waste Glass–Carbide Lime Blends for Geotechnical Uses

This study evaluates the alkali activation of a binary system composed of sugar cane bagasse ash and carbide lime as a green stabilization technique for bauxite tailings (BTs). To analyze t...

Green Stabilization of Bauxite Tailings: Mechanical Study on Alkali-Activated Materials

Recent tailings dam failures have attracted special attention to the mining sector. These incidents pressured the mining industry to develop more secure and sustainable practices. Geotechnical techniques, such as soil stabilization with ordinary Portland cement (OPC), have been explored as alternatives to this problem. However, OPC production is associated with high energy consumption, exploration of natural resources, and greenhouse gases emission. Thus, alternative materials to OPC, with lower environmental impacts and similar mechanical performance, are growing in interest for stabilization techniques. The present study describes the mechanical behavior of gold tailings stabilized with alkali-activated carbide lime and sugarcane bagasse ash. As a control group, the gold tailings were also stabilized with high initial strength Portland cement (type III). The specimens were tested regarding their unconfined compressive strength, stiffness, and durability. All results were correlated with the porosity/binder index to create a rational dosage methodology for the tailings-cement mixtures. Results have shown that Portland cement mixtures resulted in more expressive strength, stiffness, and durability results when compared to the alkali-activated cement. Nevertheless, the alternative cement was also able to improve the mechanical behavior of the gold tailings. Reduction in porosity and increase in cement content led to the improvement of the mechanical behavior of all specimens. A direct correlation was established between strength, stiffness, and durability. The porosity/binder index was shown to be a viable dosage method to predict the mechanical behavior of stabilized gold tailings, allowing the unification of the results in a single relation, replacing trial and error conventional strategies. 

Stabilization of gold mining tailings with alkali-activated carbide lime and sugarcane bagasse ash

Sulfate-rich dispersive soils are worldwide responsible for damaging earthworks, such as roadway roadbeds and embankments. One of the causes for such behavior is the high amount of exchange...

Fatigue Life of Green Stabilized Fiber-Reinforced Sulfate-Rich Dispersive Soil

Key parameters establishing alkali activation effects on stabilized rammed earth

The improvement of soils that are not suitable for a particular purpose through techniques that combine densification and the incorporation of portland cement have been extensively done for...

Dionatas Andreghetto

Papers

Durability Assessment of Soil-Pozzolan-Lime Blends through Ultrasonic-Pulse Velocity Test