في مواجهة مشاكل مثل العرض غير المستقر للرمل والحصى والجودة التي لا يمكن السيطرة عليها، فضلاً عن التقدم المستمر لتكنولوجيا الخرسانة ومتطلبات المواد الصارمة بشكل متزايد لمشاريع البناء، تختار العديد من شركات الخرسانة التعاون معنا من أجل تحسين جودة الخرسانة. المنتجات الخرسانية وزيادة أرباح الشركات إنشاء ركام من الرمل والحصى عالي الجودة.
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·Tailings have been widely used in engineering construction in the form of tailings sand [19] [20] which is due to the following characteristics 1 the fineness modulus of tailings sand mainly in the range of is similar to fine and ultra fine natural sand [21]; 2 the apparent density of tailings sand ranging from 2600 to 3200 kg
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·One of such method is the application of tailings in sustainable concrete production It is shown that physical and chemical characteristics of tailings are comparable to crusher sand used in engineering construction and therefore tailings can be used to partially replace sand in bituminous and concrete mixtures
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·e iron tailings sand was used as ne aggregate to pre pare cement mortar and the river sand was used for comparison and a prex letter G and D corresponding to the water/binder ratios of and was added to name the mortars prepared with them e uidity of Fig 1 Natural river sand and iron tailings sand samples
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·As a result previous studies [7] [8] [9][10][11] indicate that gold mine tailings can be used as fine sand for construction and raw materials for ceramics brickmaking and cement However due
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·of iron ore tailings are the same as natural sand and the high silica co ntent in the iron o re tailings i ndicates that they can be used to prepare concrete is considered
·Studies [7 11 12 13] have shown that iron tailings sand could be used in concrete as sand replacement and in order to maximize the effect of iron tailings sand in reducing environmental problems cost and natural resources depletion a 100% replacement ratio was used in this study A polycarboxylate superplasticizer of 1% was
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·to solve the sand scarcity and maximize industrial waste utilization The workability and mechanical properties of concrete specimens with varying percentages of iron ore tailings as replacement The ndings indicate that concrete with 35% iron ore tailings replacement performs similarly to natural sand concrete and it can be used in engineering
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·The long term storage of tailings can also create further issues including the seepage of oil sands process affected water OSPW from tailings ponds into groundwater Fennell and Arciszewski 2019 A recent study showed the infiltration of OSPW into groundwater adjacent to tailings ponds and sediments beneath pond water
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·Overburden contains very little bitumen and can be used for lining ponds construction of roads tailings dykes and embankments 3 OIL SANDS ORE Oil sands deposits are a loose or unconsolidated sand deposit which contains bitumen a heavy complex hydrocarbon or petroleum fine clays and small amount of water
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·The use of tailings sand for CO 2 mineralization and utilization CMU has been emerging globally offering a sustainable solution for repurposing tailings sand while establishing a stable carbon sink Despite several reports that evaluated process performance and project benefits existing research has not delved into the project layout
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·After water aggregates sand gravel and crushed rock are the second most exploited natural resource in the world Their use has tripled over the last two decades to reach an estimated 50 billion tonnes per year and the demand is growing exponentially around the world with urbanisation development population growth and sea level rise
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·Proceedings Tailings and Mine Waste 2011 Vancouver BC November 6 to 9 2011 1 Cycloning of Tailing for the Production of Sand as TSF Construction Material Christian Kujawa Paterson & Cooke Ltd Golden USA Abstract Hydro cycloning of plant tailings is an often used tool to produce relatively coarse free draining sand cyclone
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·Sand mining tailing ST is a byproduct of the sand extraction of submerged pits a process which is carried out to obtain aggregates for civil construction This tailing consists of fine particles from the pulp washing process usually disposed of in decantation ponds The present study proposes ST as a supplementary cementitious material SCM
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The CO2 emission can be reduced by up to % In the area near the mine site utilization of the tailings can economically and environmentally as well as in terms of durability be a better option than quartz sand for construction works that require UHPC with 28 strength in excess of 120 MPa Keywords CO2
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·Detailed mineralogical study by Geremew 2013 has shown that tailings with high montmorillonite content showed greater resistance to cyclic loading than with kaolinite mineral [] The grain size distribution from different studies clearly shows that tailings generally come under silty sand classification where more than 50% sand with very few
·Studies [7 11 12 13] have shown that iron tailings sand could be used in concrete as sand replacement and in order to maximize the effect of iron tailings sand in reducing environmental problems cost and natural resources depletion a 100% replacement ratio was used in this study A polycarboxylate superplasticizer of 1% was
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The main components of iron ore tailings are the same as natural sand and the high silica content in the iron ore tailings indicates that they can be used to prepare concrete is considered Microstructure of IOT According to the study by [32] the XRD pattern of IOT as shown in Fig 3 shows that there is a presence of kaolinite and calcite
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·was used to produce blocks with tailings as a substitute for sand Figure 2 a with the proportions shown in T able 2 Sustainability 2022 14 x FOR PEER REVI EW 5 of 14
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·Iron ore tailings are a common type of hazardous solid waste in China and have caused serious environmental problems and the high cost of producing ultra high performance concrete UHPC provides
·Tailings have been widely used in engineering construction in the form of tailings sand [19] [20] which is due to the following characteristics 1 the fineness modulus of tailings sand mainly in the range of is similar to fine and ultra fine natural sand [21]; 2 the apparent density of tailings sand ranging from 2600 to 3200 kg
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Our work has demonstrated that by products of metal mining can be used as a viable and sustainable ore sand for construction aggregate or other industries silica sand displacing the need for sand extracted from the natural environment Vale s Sustainable Sand to impact tailings generation plans Sustainable Minerals Institute 15
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