Evaluation of the long-term compressive strength development of the sewage sludge ash/metakaolin-based geopolymer

Istuque, Danilo Bordan; Soriano, Lourdes; Borrachero, M.V.; Payá, J.; Akasaki, Jorge Luís; Melges, José Luiz Pinheiro; Tashima, Mauro M.

doi:10.3989/mc.2021.13220

Cited by 3 publications

(1 citation statement)

References 47 publications

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“…On the other hand, building materials have heterogeneous compositions and microstructures; therefore, they tolerate compositional variations in waste from different campaigns. In recent decades, several studies have focused on the reuse of waste as a raw material in the manufacture of different construction materials, such as various types of clinker [ 5 ], cement [ 6 , 7 , 8 ], mortars [ 9 ], concretes [ 10 , 11 , 12 , 13 ], geopolymers [ 14 , 15 ], clay bricks [ 16 , 17 , 18 , 19 , 20 ], ceramic tiles [ 21 , 22 ], and roof tiles [ 23 , 24 ].…”

Section: Introductionmentioning

confidence: 99%

Development of Lightweight Mortars Using Sustainable Low-Density Glass Aggregates from Secondary Raw Materials

Romero,

Padilla,

García Calvo

et al. 2023

Materials

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In this study, different lightweight expanded glass aggregates (LEGAs) were produced from glass cullet and various carbonated wastes, through a thermal impact process. The effects of LEGA microstructure and morphology on both the adherence to the cement paste and the mechanical properties of mortars after 28 days of curing were studied. The properties of lightweight mortars made of either LEGAs or expanded clay aggregates were compared. The results demonstrated the feasibility of using LEGAs to produce glass lightweight aggregate mortar, with flexural and compressive strength values ranging from 5.5 to 8.2 MPa and from 28.1 to 47.6 MPa, respectively. The differences in mechanical properties were explained according to the microstructures of the fracture surfaces. Thus, arlite-type ceramic aggregates presented surface porosities that allowed mortar intrusion and the formation of an interconnected interface; although the surfaces of the vitreous aggregates were free from porosity due to their vitreous nature, the mortars obtained from different wastes presented compressive and flexural strengths in the range of lightweight mortars.

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Section: Introductionmentioning

confidence: 99%

Development of Lightweight Mortars Using Sustainable Low-Density Glass Aggregates from Secondary Raw Materials

Romero,

Padilla,

García Calvo

et al. 2023

Materials

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Effect of the incorporation of spent diatomaceous earths on the properties of alkaline activation cements based on sewage sludge ash

García-Díaz,

Bueno-Rodríguez,

Felipe-Sesé

et al. 2024

Archiv.Civ.Mech.Eng

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The aim of this research is to evaluate the synergistic effect of the incorporation of spent diatomaceous earth (SDE) from beer filtration on the technological properties of alkaline-activated cements (AACs) based on sewage sludge ash (SSA). Pastes have been manufactured by mixing different amounts of precursor, SSA (30–70% by weight) and SDE (30–70% by weight). The cements were activated using a solution of sodium silicate (50% by weight) and sodium hydroxide (50% by weight NaOH with 8 M) as activator. A liquid/binder (l/b) ratio of 1.2 were used for cements with 30–40% by weight of SSA and 1.0 for binders with 50–70% by weight of SSA. The specimens were cured at room temperature for 7, 28 and 56 days. Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD) and scanning electron microscopy (SEM) were used for the microstructural characterization of the AACs. The mix proportion of the precursors or the CaO/SiO ratio exerts a substantial impact on the physical, mechanical, and thermal characteristics of the examined AACs. Binders containing 40% by weight SSA and 60% by weight SDE show optimal technological properties, reaching compressive strengths of 32.8 and 36.8 MPa at 28 and 56 days of curing, respectively. This may be due to the formation of different gel types according to SEM analysis: a compact gel phase characterized by a fibrous structure corresponding to the N-(A)-S-H gel surrounding flatter and more uniform zones corresponding to the calcium aluminosilicate gel, C-A-S-H, and a mixed amorphous N,C-A-S-H gel. The results indicated that is possible to produce more sustainable alternative binding materials from the recovery of two types of waste: one from the wastewater treatment, and the other originating from the filtration process in the brewing industry.

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Optimization of eco-friendly materials by alkali activation of the sewage sludge ash (SSA) to reduce carbon footprint

El Nagar,

Salem,

Hasaballah

et al. 2023

HBRC Journal

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Evaluation of the long-term compressive strength development of the sewage sludge ash/metakaolin-based geopolymer

Cited by 3 publications

References 47 publications

Development of Lightweight Mortars Using Sustainable Low-Density Glass Aggregates from Secondary Raw Materials

Development of Lightweight Mortars Using Sustainable Low-Density Glass Aggregates from Secondary Raw Materials

Effect of the incorporation of spent diatomaceous earths on the properties of alkaline activation cements based on sewage sludge ash

Optimization of eco-friendly materials by alkali activation of the sewage sludge ash (SSA) to reduce carbon footprint

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