Pozzolanic Activity of Old Volcanic Tuffs of Mako Area (Senegal-Oriental, West African Craton): An Economic and Environmental Interest

Ndiaye, Matar; Diène, Mahamadane; Diop, Michel Bakar; Ngom, Papa Malick

doi:10.4236/ijg.2019.103014

Cited by 2 publications

(1 citation statement)

References 20 publications

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“…Natural (volcanic origin) pozzolans are used as SCMs due to their advantages of increasing durability, lowering costs, reducing the heat of hydration, boosting freezing–thawing, concrete strength, and sulfate resistance, as well as environmental benefits 11 – 13 .Pyroclastic ash is the most famous volcanic ash utilized as a supplementary cementitious material 14 .…”

Section: Introductionmentioning

confidence: 99%

Valorification of Egyptian volcanic tuff as eco-sustainable blended cementitious materials

Eldahroty

Farghali

Shehata

et al. 2023

Sci Rep

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Rhyolite rocks extend from southern Egypt to northern Egypt in the Eastern Desert, and no effective economic exploitation of them has been discovered so far. The pozzolanic activities of different volcanic tuffs (VT) supplied from the Eastern Desert located in Egypt have been investigated as natural volcanic pozzolan materials to develop new green cementitious materials for achieving sustainability goals in the construction field. Experimentally in this paper, the pozzolanic activities of seven diverse specimens of Egyptian tuffs taken with standardized proportions of 75:25% (Cement: volcanic tuffs) were investigated. Pozzolanic features of such tuffs are examined comparatively via strength activity index (SAI), TGA, DTA, and the Frattini’s test. Chemical composition, petrographic, and XRD analysis were also performed for tuffs samples. The pozzolanic reaction degrees were determined according to the compressive strengths at 7, 28, 60 and 90 days with different replacement ratios (20, 25, 30 and 40%) of tuffs samples. Additionally, the micro-filler effects in mortar and concrete were determined by measuring the heat of hydration in mortar samples and the compressive strength of concrete with different additive ratios for tuffs samples besides, the concrete slump test. The results show that TF6 gives a lower cement heat of hydration value which is less than 270 J/g at 7 days. Also, its performance in concrete is better than silica fume at late strength (28 days) since the concrete index value is 106.2% by compared to the concrete index of silica fume 103.9 and therefore it can be used as an alternative to high price and quality variable silica fume (SF) for producing high-performance green concrete. Due to the good pozzolanic behavior proved by nearly most volcanic tuffs, along with their low cost, this study will be profitable for very auspicious the use of Egyptian volcanic tuffs for developing sustainable and eco‑friendly blended cement.

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Section: Introductionmentioning

confidence: 99%

Valorification of Egyptian volcanic tuff as eco-sustainable blended cementitious materials

Eldahroty

Farghali

Shehata

et al. 2023

Sci Rep

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Archaeometric characterization and restoration proposal for filling mortars of Oshki (Öşvank) church

Kavali,

Eroğlu,

Çakıcı

et al. 2023

Herit Sci

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In order to ensure the sustainability of cultural, historical and architectural heritage, preserving and restoring historical buildings and transferring them to future generations is one of the important issues of today. Restoration decisions regarding the repairs of historical buildings are of great importance in this context. Developing correct intervention decisions requires the thorough analysis of the structure, the determination of the structural and material properties meticulously, and the use the most appropriate materials for repairing it. However, only physical and chemical analyses are not sufficient to determine material properties of historical buildings; therefore, archaeometric analyses are needed to determine them more appropriately. In this study, it is aimed to determine the components and characteristics of the filling mortars of Oshki (Öşvank) Church, one of the most magnificent structures of the Eastern Anatolia region, in order to preserve the masonry structure and guide the restoration studies in the light of archaeometric analyses. The raw material properties of the samples taken from the filling mortars of the church were determined by the physical, chemical and petrographic analyses. As a result of the analyses, the aggregate-binding properties of Oshki Church filler mortars were determined. It was revealed that the aggregate content was determined as petrographic, lime was used as a binder and all samples contained pozzolan whereas no cement was used in any of the samples, and the samples did not contain marble rice/powder and organic additives like oil, protein etc. It has also been observed that the aggregate in the mortar content is compatible with the geological formations of near surrounding of the church. In this context, this study emphasizes the importance of archaeometric analysis in restoration of historical buildings. Moreover, differing from other studies in the literature, this study proposes mortar recipe to be used in the restoration of the church, which can pioneer to future studies in the field of architectural restoration.

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Pozzolanic Activity of Old Volcanic Tuffs of Mako Area (Senegal-Oriental, West African Craton): An Economic and Environmental Interest

Cited by 2 publications

References 20 publications

Valorification of Egyptian volcanic tuff as eco-sustainable blended cementitious materials

Valorification of Egyptian volcanic tuff as eco-sustainable blended cementitious materials

Archaeometric characterization and restoration proposal for filling mortars of Oshki (Öşvank) church

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