Treatment of clay soils with steel slag, in road engineering

Abstract

The road construction sector draws large quantities of materials every day to meet the needs of infrastructure networks. The main aim of the link between different regions is to facilitate the transport and connection of these agglomerations. With such a pace, a shortage of these materials is worsening by the day, causing an imbalance in our “ecosystem” on the way. All these factors and many others have raised the alarm among managers in the construction industry. Environmental organizations have since been constantly seeking palliative solutions to this global scourge. In addition, several industries generate a large amount of waste annually, in some cases recoverable while respecting certain technical and environmental criteria. It is in this environmental approach, embracing a philosophy of circular economy that multiple co-products (Slag, Fly Ash, Phosphogypsum, Silica Fume…etc.) have been tested and numerous studies have demonstrated their ability to be used as a substitute for natural resources. In this respect, the following article will focus, through studies conducted in public laboratory, on various mixtures of the "soil-slag" couple to assess their possible use in road engineering. First, an identification of the materials (soil from the Sidi Kacem region and slags from a steel industry) to be adopted in our analysis will be carried out, then we will proceed to Proctor/CBR tests on soil-slag mixtures, defined in advance in order to decide on the possibility of developing them in road engineering and thereby reduce the quantities in contribution of noble materials.

Phosphogypsum and Black Steel Slag as Additives for Ecological Bentonite-Based Materials: Microstructure and Characterization

“…The hazardous trace elements (Cd, Se, Cr etc.) containing in Moroccan PG and Ss leachates were studied, respectively, by Sebbar et al [44] and Hassoune et al [45] (Table 4).…”

Dosagem Estatística de misturas solo-resíduos siderúrgicos visando a aplicação em camadas estruturais de pavimentos asfálticos

“…Observou-se que houve redução do teor de umidade ótimo em todas as misturas para as duas amostras de solo analisadas em relação às referidas amostras no estado natural. Observou-se que, com o aumento do teor de resíduos, sobretudo com o teor de EAEP, o teor de umidade ótimo diminuiu, tendência também observada por outros autores (ALDEEKY; AL HATTAMLEH, 2017;GUNARTI;RAHARJA, 2020;SEBBAR et al, 2020;ZUMRAWI;BABIKIR, 2017).…”

“…Para as duas amostras de solos, um aumento nos teores de resíduos nas misturas gerou acréscimos nos valores de peso específico aparente seco máximo, sobretudo com a adição de EAEP. Isso se deve ao fato de que a massa específica real da EAEP é maior do que a das duas amostras de solo, o que resulta em uma estrutura mais densa que pode influenciar de maneira positiva nas propriedades mecânicas das misturas, gerando seu incremento, conforme constatado em várias pesquisas (AL-AMOUDI et al, 2017;ALDEEKY;AL HATTAMLEH, 2017;BRAND et al, 2020;OLUWASOLA et al, 2020;SEBBAR et al, 2020).…”