L’évolution du contexte environnemental mondial invite de plus en plus les entreprises à réduire leur impact en réutilisant des matériaux de proximité et en favorisant l’économie circulaire. Les sédiments de dragage représentent une source potentielle de matériaux grâce à leur volume important. En effet, les opérations de dragage réalisées en Nouve...
Published in IOP Conference Series: Earth and Environmental Science
Coarse aggregate is considered the most vital aspect, providing quantity and strength to the concrete. The aggregates are obtained mainly from natural resources by quarrying rocks or riverbeds. Each year, construction industries use large amounts of natural aggregates, resulting in the depletion of raw materials. Different methods, such as sinterin...
This experimental research investigates the influence of geopolymerization factors such as Na₂O dosages, water and mineral admixture [bentonite (BT), burnt lime (BL), and ground granulated blast furnace slag (GGBS)] on physiomechanical properties of the pelletized fly ash (FA)–based aggregates. Taguchi’s L₉ orthogonal array was adopted to design th...
This paper studies the behavior of four different calcined clay-based geopolymers under sulfuric acid attack and gives insights into their degradation mechanisms. Pastes were cast using metakaolin and meta-illite and were activated by two different alkaline solutions. Mineralogical and microscopic characterizations were performed on pastes before a...
Published in Environmental science and pollution research international
Geopolymer bricks from lead glass sludge (LGS) and alumina flakes filling (AFF) waste were synthesized in the present work. AFF waste was chemically treated to prepare sodium aluminate (NaAlO2) powder. Silicate source (untreated LGS and thermally treated one at 600 °C (LGS600)) and sodium oxide (Na2O) concentration (as NaAlO2) were the compositiona...
Les matériaux alcali-activés apparaissent comme une alternative potentielle aux liants hydrauliques classiques dans plusieursapplications en génie civil, pour répondre à des enjeux techniques et environnementaux. Néanmoins, ces matériaux n’ont pas étésuffisamment explorés dans le domaine du renforcement des sols. Cette thèse a pour but d’évaluer le...
This paper focuses on the effectiveness in the improvement of clay soils of using geopolymers of fly ash (FA), metakaolin (MK), or blast furnace slag, activated by an alkaline solution of sodium hydroxide (NaOH), sodium silicate (Na 2 SiO 3), or a mixture of both. The unconfined compressive strength (UCS) of samples cured for 1, 7, and 28 days was ...
The increasing use of geopolymer materials in the construction and civil engineering sectors generates a large amount of non-biodegradable waste that will end up in landfills. It is therefore necessary to anticipate solutions for the proper management of this waste. In this work, new geopolymer materials were fabricated by partially replacing the r...
Les argiles présentant des propriétés insuffisantes pour la construction, telle qu’une plasticité élevée ou du gonflement, font depuis longtemps l’objet de traitements améliorant leurs caractéristiques et permettant leur réemploi. Ces traitements, souvent réalisés par des méthodes dites conventionnelles utilisant notamment du ciment ou de la chaux,...
Published in Heliyon
Geopolymerization; Mine tailings; Sugar mill lime sludge; Fly ash; Palm oil fuel ash; Powder activator
