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...

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

The use of domestic, industrial and construction waste has been gaining considerable space in recent decades in view of the social and environmental concern in preserving and reusing natural resources. Thus, this article has the premise of studying the use of the mixture of three residues, evaluating the feasibility of using these as a pavement layer. The first residue is the reclaimed asphalt pavement (RAP) coming from the milling of the asphalt coating of a pavement. The second material used is carbide lime (CL), a residue from the production of acetylene gas that will act as a cementing agent. To react with the carbide lime, a third material was also used: the flat ground glass, since it has a high content of SiO2 in its composition. Thus, it is possible that pozzolanic reactions occur with calcium ions in lime, forming cementing compounds and acquiring properties of strength, durability and rigidity. It was evaluated the variation of the carbide lime (3 and 7%), the dry unit weight (19 and 20 kN/m3) and the ground glass (GG) content passing through the #200 sieve (10, 15 and 25%) in front of the unconfined compression, split tensile, durability and rigidity tests. The results show that the effect of each of the selected variables is considered satisfactory to obtain significant results for each of the tests. The porosity/binder index [η/Biv0.28] proved to be adequate for predicting the mechanical behavior of the mixtures, and it was even possible to make correlations between test results. Furthermore, a generalized approach to replace the laborious durability test is proposed, and limitations are observed.

Durability evaluation of reclaimed asphalt pavement, ground glass and carbide lime blends based on unconfined compression tests

The lateral cyclic loaded piles' behaviour in bonded residual soil is still poorly understood by classical geotechnics. Currently used models reproduce the behaviour of residual soils based on thos...

Aziz Tebechrani Neto

Papers

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

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

Durability evaluation of reclaimed asphalt pavement, ground glass and carbide lime blends based on unconfined compression tests

Effects of cross-section shape on cyclic lateral response of steel piles in residual soil