Effect of Partial Replacement of Natural Sand With Gold Mine Tailings on Some Properties of Masonry Mortars

Vignesh, S.; Reddy, B. Madhusudana; Nachiar, S. Sindhu

doi:10.17577/ijertv4is040808

Cited by 4 publications

(4 citation statements)

References 2 publications

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“…The study allowed to see the evolution of the concrete compressive strength of the substitution of NRS by GMT from 0 up to 100% of the experimental domain defined above. The compressive strength was found to vary between 11 and 37 N/mm 2 with 11 N/mm 2 for the total substitution of NRS by GMT with a dosage of 20 kg of GMT (0 kg of NRS), 10 kg of cement, and 40 kg of gravel and 37 N/mm 2 for the dosage of 20 kg of NRS (0 kg of GMT), 15 It was also found that larger quantity of gravel (40 kg) improved the concrete compressive strength from 70% up to 100% of GMT as substitute to NRS when 15 kg of cement was used.…”

Section: Conclusion and Perspectivementioning

confidence: 99%

“…When the amount of GMT is continuously added to the concrete, the compressive strength decreases. There are several possible reasons, including the GMT grain size, its chemical characteristics, and the water/cement ratio [11,[13][14][15][16]]. The fine grading promotes higher water use.…”

Section: Analysis Of the Individual Contribution Of Each Concrete Con...mentioning

confidence: 99%

“…A few studies have shown the possibility of a partial substitution of natural river sand (NRS) by GMT in concrete manufacturing [11][12][13][14][15][16]. In general, partial substitution varies between 5 and 30% of natural sand, since beyond 30% of substitution, the concrete compressive strength was decreasing.…”

Section: Introductionmentioning

confidence: 99%

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Use of a Design of Experiments (DOE) for Studying the Substitution of Natural River Sand (NRS) by Gold Mine Tailings (GMT) in Concrete Manufacturing

et al. 2022

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The extraction of precious minerals leaves behind an important amount of tailings. When stored in nature, these tailings contribute to environmental degradation. To reduce this degradation, tailings are incorporated in construction as substitute to natural materials. The objective of this study was to use a design of experiments (DOE) to reveal how the substitution of natural river sand (NRS) by gold mine tailings (GMT) in concrete manufacturing can be optimally achieved. This DOE considered three constituents: the amounts of NRS/GMT, that of gravel and of cement. The experimental domain was defined within the concrete standards dosage of 350 kg/m3 and 400 kg/m3 as the lower and upper levels, respectively. The smallest compressive strength on standard cubic specimens on the 28th day varied between 11 N/mm2 and 37 N/mm2 following to the experimental domain. The values of the compressive strength of the experiments carried out allowed to acquire the model of the strength with the coefficients of each factor: Strength=23.25−5.86*A+4.56*B−1.96*C−0.56*A*B+1.41*A*C+1.08*B*C+0.71*A*B*C (with A: GMT+NRS; B: cement; C: gravel). The values of the cumulative weight of the coefficients of each factor were 36.7% (A), 64.5% (B) and 76.6% (C). The study also found that a larger dosage of gravel (40 kg) improves the concrete compressive strength when GMT substitutes NRS between 70% and 100% and when 15 kg of cement is used. For a sustainable and better reuse of GMT as construction materials, an economic and environmental study (the leaching of metals) of the concrete based on GMT would be ideal to consider a large scale production.

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Section: Conclusion and Perspectivementioning

confidence: 99%

Section: Analysis Of the Individual Contribution Of Each Concrete Con...mentioning

confidence: 99%

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Use of a Design of Experiments (DOE) for Studying the Substitution of Natural River Sand (NRS) by Gold Mine Tailings (GMT) in Concrete Manufacturing

et al. 2022

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“…Vignesh, Reddy and Nachiar [8] reported that, in search of an alternative material for natural sand, Witwatersrand gold mine tailings are substituted partially for natural sand in the production of masonry mortars. In order to study the effect of replacing natural sand by gold mine tailings, natural sand was replaced with gold mine tailings at three percentages (10%, 20% and 30%).…”

Section: Introductionmentioning

confidence: 99%

Utilization of Bergama Gold Tailings as an Additive in the Mortar

Kunt¹,

Yıldırım²,

Dur³

et al. 2015

CBU J of Sci

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Bergama is the first gold mine in the history of Turkish Republic and currently one of the operating gold mine in Turkey. About 3 tons of gold and equal amounts of silver are mined each year. The estimated ore reserves at the Bergama gold mine are 2.4 million tons with about 10 g Au per tonne of ore. About 277.882 tons of the tailings slurry of gold mine treatment is produced every year during the recovery of gold. Increasing amounts of tailings slurry cause a problem in large disposal areas. Therefore, the recycling of this kind of slurries into useful materials is quite important in terms of economic and environmental aspects.The aim of this study was the investigation of utilization of the gold tailings as an additive material in Portland cement production. For this purpose, the effects of the gold tailings on the compressive strength properties of Portland cement were investigated. Cement mortars were prepared with Portland cement (CEM I 42,5 N) and dried gold tailings. Gold tailings with different ratios (5, 10, 15, 20, 25%) were added as cement additive in the mortar. The fresh properties of mortar such as consistency and setting time were investigated by using Flow table and Standard Vicat apparatus. The mortars were tested for compressive and flexural strength values after 3, 7 and 28 days. Mineralogical composition and microstructure of the 28-day mortars were determined by X-ray diffraction (XRD) and scanning electron microscope (SEM). According to results, it can be concluded that the tailings are eligible for mortar aggregate and the optimum ratio of gold tailings is 5%.

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