Thermal, X-ray Diffraction and Oedometric Analyses of Silt-Waste/NaOH-Activated Metakaolin Geopolymer Composite

Moro, Daniele; Fabbri, R.; Romano, Jennifer C.; Ulian, Gianfranco; Calafato, Antonino; Solouki, Abbas; Sangiorgi, Cesare; Valdrè, Giovanni

doi:10.3390/jcs5100269

Cited by 8 publications

(5 citation statements)

References 39 publications

(54 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Metakaolin is the commercial product Metamax (Basf SE Ludwigshafen, Germany), a very reactive metakaolin as recently shown by [10], which was obtained through calcination of pure kaolinite at 850°C for 5 hours. It shows an intense white colour and a very fine granulometry.…”

Section: Methodsmentioning

confidence: 99%

Synthesis of geopolymers as sustainable materials for applications in Cultural Heritage

Rovella¹,

Ulian²,

Moro³

et al. 2023

Proceedings of the 2022 IMEKO TC4 International Conference on Metrology for Archaeology and Cultural Heritage

View full text Add to dashboard Cite

Recently, the studies on the possible applications of geopolymers as a sustainable alternative to the traditional concretes and consolidants increased considerably in many fields such as Cultural Heritage. The potentialities linked to their production concern the lower CO2 emissions, the possibility to reuse processing waste and the encouraging results in durability, chemical stability, and mechanical resistance. In this work, an industrial silt, a waste product of quarry rocks washing, was recycled in the synthesis of a series of Na-polysialate (siloxo) geopolymer concretes. The mechanisms of synthesis of metakaolin-based geopolymers were investigated, along with the influence of water content, described by the molar ratio H2O/Na2O, on the final product. The results obtained suggest that all the activating solutions effectively produced a reaction between the precursor and the activators, developing different geopolymers, but only the compositions with a low water content achieved the expected high compressive resistance qualities.

show abstract

Section: Methodsmentioning

confidence: 99%

Synthesis of geopolymers as sustainable materials for applications in Cultural Heritage

Rovella¹,

Ulian²,

Moro³

et al. 2023

Proceedings of the 2022 IMEKO TC4 International Conference on Metrology for Archaeology and Cultural Heritage

View full text Add to dashboard Cite

show abstract

“…Design of Experiments (DOE), or statistical experimental design, is a profound approach and methodology for model building and optimizing multivariable systems [1,2]. For instance, tackling and optimizing problems related to the effect of process factors on production properties could be managed through fractional factorial or central composite design methods.…”

Section: Design Of Experiments and Mixture Optimizationmentioning

confidence: 99%

“…Recycling such material is of paramount importance since it could reduce the adverse environmental impacts due to landfills. These kinds of materials have been used in the production of several products, such as geopolymers, cement mortars, artificial aggregates, and pavements [1][2][3][4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Mixture Optimization of Concrete Paving Blocks Containing Waste Silt

2022

Self Cite

View full text Add to dashboard Cite

Most of the waste materials recycled for the production of new construction materials are by-products of various manufacturing processes, such as the aggregate washing process. Recycling such materials is of paramount importance since it could reduce the adverse environmental impacts resulting from landfilling. Various studies have attempted to recycle different types of waste materials and by-products into concrete paving blocks. However, the availability of literature on concrete paving blocks containing waste silt is quite scarce. Thus, the current paper focuses on mix design optimization and production of concrete paving blocks containing high amounts of waste silt resulting from the aggregate production process. Using the mixture Design of Experiments (DOE), 12 sets of concrete paving blocks with different aggregate blends were produced to optimize the mix design. Once the final mix design was achieved, the physical and mechanical properties of the concrete paving blocks were investigated following the EN 1338 standard. Shape and dimension measurements and various tests, including water absorption, tensile splitting strength, abrasion resistance, and slip/skid resistance were conducted on the experimental concrete paving samples. Overall, the produced concrete paving blocks showed promising properties for future applications in pedestrian walking paths.

show abstract

“…Different precursors have been used in various research studies, among them fly ashes [33], metakaolin [34,35] and blast furnace slags [36]. The type of precursor has a direct impact on many mechanical and chemical properties of the geopolymer.…”

Section: Precursorsmentioning

confidence: 99%

“…Based on XRD analysis for both the metakaolins, MK2 was found to be more reactive if compared to MK1, denoting the presence of amorphous reactive phases [34] and, thus, suitable to be used. On the other hand, MK1, even though it has an amorphous phase, has a crystal formation in it, probably due to some impurity originated in the production process, more likely to be a less calcinated kaolin (quartz-like structure).…”

Section: Metakaolinmentioning

confidence: 99%

A Preliminary Laboratory Evaluation of Artificial Aggregates from Alkali-Activated Basalt Powder

et al. 2022

Self Cite

View full text Add to dashboard Cite

The widespread use of natural aggregates is one of the main causes of the depletion of natural resources, as aggregates are constituents of several construction materials. Alternatively, it is, today, proven to be feasible to use mining tailings, either natural or recycled materials, to produce artificial aggregates through specific processes. A possible way to produce artificial aggregate is through the alkali activation of the powdered material in a process called geopolymerization. This study proposes to use a basalt powder and two different metakaolins as precursors for the production of an alkali-activated artificial aggregate, with a specific shape and size achieved by using 3D-printed molds. The experimental aggregates were evaluated using traditional tests for natural aggregates, such as resistance to compression, specific density and resistance to abrasion and fragmentation. Furthermore, the material was chemically analyzed in order to evaluate the geopolymerization process promoted by the two adopted metakaolins. The physical tests showed that artificial aggregates do not perform well in terms of resistance to wear and fragmentation, which can be improved. However, they revealed promising results in terms of skid, polishing and micro-texture.

show abstract

Thermal, X-ray Diffraction and Oedometric Analyses of Silt-Waste/NaOH-Activated Metakaolin Geopolymer Composite

Cited by 8 publications

References 39 publications

Synthesis of geopolymers as sustainable materials for applications in Cultural Heritage

Synthesis of geopolymers as sustainable materials for applications in Cultural Heritage

Mixture Optimization of Concrete Paving Blocks Containing Waste Silt

A Preliminary Laboratory Evaluation of Artificial Aggregates from Alkali-Activated Basalt Powder

Contact Info

Product

Resources

About