Particle size distribution of aggregates effects on mesoscopic

The most economical, environmental, and friendly method is to use the gangue as the aggregate of cemented waste rock backfill (CWRB) to filling mining. The structural …

Study on Test and Ratio Optimization of Waste Rock-Fly Ash Aggregate …

The selection of cement-tailings ratio directly determines both the strength of the filling body and the running cost of a mine.The optimum ratio of waste rock and aeolian sand is obtained ...

Assessing the Suitability of Phosphate Waste Rock as a

Phosphate waste rock (PWR) is gaining attention as a potential alternative aggregate for concrete. Its valorization could reduce the environmental impacts of quarrying natural resources and stockpiling phosphate mining waste. This study comprehensively investigated the properties of fine and coarse aggregates produced from three rock types …

Recycling of Mine Wastes in the Concrete …

Eventually, the potential use of coal mining waste rocks as recycled aggregate in concrete was assessed by Thang et al. in 2021. The authors claim that the used coal mine waste rock was suitable for producing …

A detailed review study on utilization of mine and industrial …

The decreased usage of waste rock, rock aggregate, and building demolition debris in paste backfilling is a result of bigger particle size and the need for extra sieving and chopping to obtain the appropriate particle size. Several forms of mill tailings exist. Tantalum-niobium ore tailings, red mud, uranium, lead-zinc, nickel, gold-silver ...

Degradation mechanism and life prediction of tailings and …

Tailings and waste rock are the main solid wastes in metal mining, and their massive accumulation causes serious air, water and soil pollution [1, 2].The use of tailings and …

'Waste rock' could become high-value aggregate …

Natural gravel is pretty consistent. The waste rock that Nemanich is hauling out—the Mesabi Select—has a consistent, lower specific gravity that makes a quality asphalt. "Identifying this aggregate is a huge benefit that …

Investigation of the strength of concrete-like material with waste rock …

waste rock is used as coarse aggregate and aeolian sand is used. as ne aggregate. T he physical parameters of the two aggregates. are shown in T able 1. 2.1.2. Aggregate gradation.

Assessment of cemented waste rock backfill for recycling …

Filling mining with cemented waste rock backfill (CWRB) is an optimal approach to eliminate the gangue waste pollution. To efficiently evaluate the gangue recycling and its advantage in structure protection, the effects of the confining pressure, cement dosage, and aggregate particle size distribution (PSD) on the creep behavior of CWRB were investigated. …

Crushed Stone Aggregates for Construction: The Many Uses …

It's good for the Earth and great to reduce cost since there are savings on throwing out waste and buying new materials. With modern crushing technologies, recycled crushed stone aggregates can match the quality of new ones. This means the construction project's strength, durability, and performance won't be saced. Plus, this use of ...

12 uses of mine waste rock and tailings

At the same time, the waste rock used as aggregate shall not contain too much flake or fibrous rock debris. Generally speaking, limestone, fine sandstone, quartzite, granite with relatively fine crystallization, diorite, gneiss and basalt are suitable for aggregate. The concrete of some airport runways also requires basalt as aggregate, which ...

Effect of fly-ash as fine aggregate on the workability and …

An innovative solid waste management technology, called cement paste backfill (CPB), is widely used in underground mining [13], [14], [15].Backfill material consists of aggregates (unclassified tailing, excavation waste rock, gangue, etc.), binder, and water mixed in proportion and transported to the mined-out area through a pipeline system [16]. ...

A systematic review of the utilization of waste materials as aggregate …

The waste materials used as aggregate replacement in the SMA mixes include recycled asphalt pavement, recycled concrete, steel slag, palm oil clinker, waste ceramic, shredded waste plastic, and crumb rubber and were categorized based on their sources. The waste materials were used as fine aggregate or coarse aggregate replacement, or both. 4.

Potential use of granite waste sourced from rock processing …

In this study, regular and irregular aggregates separated from granite waste coarse aggregate were analyzed, the morphology of which was described using microscale laboratory tests.

Experimental study on mechanical and microstructure …

Waste rock is added to the backfill as coarse aggregate, and its effect on the UCS value of CTWRB is twofold. The strength of waste rock is much higher than that of CTB, so the skeleton structure formed in CTWRB improves the stiffness and UCS of specimens [56]. On the other hand, the strength of the contact surface between waste rock particles ...

(PDF) Assessing the Suitability of Phosphate Waste Rock as …

Phosphate waste rock (PWR) is gaining attention as a potential alternative aggregate for concrete. Its valorization could reduce the environmental impacts of quarrying natural resources and ...

Experimental study on delamination and strength …

The waste rock generated from the roadway excavation is a standard filling aggregate in the mine, which can be mixed with cementitious material and water in a certain ratio to make the cemented waste rock backfill (CWRB) achieve a certain bearing capacity [6], [7].

Experimental and numerical investigations of bending …

Firstly, the actual waste rock shape data were obtained by a 3D laser scanner. Secondly, the shape of the waste rock was imported into PFC3D, and the numerical model of the waste rock was established using the Clump command. Tailings, waste rock, and loading bar are simulated in the model by Ball, Clump, and Wall units, respectively.

Particle size distribution of aggregates effects on …

The most economical, environmental, and friendly method is to use the gangue as the aggregate of cemented waste rock backfill (CWRB) to filling mining. The structural stability of CWRB under the action of surrounding rock pressure is the key to ensure the stope safety (Cao et al. 2018; Shi and Zhao 2020).

12 uses of mine waste rock and tailings

"Waste rock is a resource misplaced". After processing, waste rock can be called high-quality gravel aggregate. If we want to realize "turning waste into treasure", we need to adopt a feasible ...

Valorization of Coalmine Overburden Waste Rock …

Characterization of OB based on strength, morphology, mineralogy, and durability, indicate that the waste rock can be a good replacement to natural aggregate in cement mortar and concrete.

Mechanical properties and durability of concrete …

Regarding the use of waste rock aggregate, several studies have reported that the mine waste rock can produce . mild to much acidity [14,15]. Therefore, the idea is to add F-class fly .

Assessing the Suitability of Phosphate Waste Rock as a

Phosphate waste rock (PWR) is gaining attention as a potential alternative aggregate for concrete. Its valorization could reduce the environmental impacts of quarrying …

Characterization and environmental sustainability of open pit …

It is clearly shown that the waste rock possesses desired properties to serve as a construction material in pavement, helping towards conservation of natural resources, reduction of waste and pollution, and ultimately towards sustainable development. ... Valorization of coalmine overburden waste rock as fine and coarse aggregate of mortar and ...

The Potential Use of Waste Rock from Coal Mining for the

Deformation failure and acoustic emission characteristics of …

The waste rock used in the experiment was taken from Yichang, China. It is the block waste rock produced during the underground production development and recovery process of phosphate mines, and was crushed by the jaw crusher to coarse aggregate with a maximum particle size of 12 mm. The chemical composition of waste rock is shown in Table 1 ...

Mechanical Characterization of Coarse-Grained Waste Rocks …

The optimal gravel-to-sand ratio to maximize resilient modulus and shear strength was around 5. Permanent strain was relatively constant when the gravel-to-sand ratio was …

Macroscopic and mesoscopic mechanical properties of cemented waste rock

Macroscopic and mesoscopic mechanical properties of cemented waste rock backfill using fractal gangue: WU Jiangyu1,JING Hongwen1,PU Hai1,ZHANG Xinguo2,3,MENG Qingbin1,YIN Qian1 (1. State Key Laboratory for Geomechanics and Deep Underground Engineering,China University of Mining and Technology,Xuzhou,Jiangsu …

Study on the Preparation of Full Solid Waste-Based Concrete …

The coarse aggregate utilized in this study is derived from waste rock sourced from Anshan Dagushan quarry in the coarse aggregate were presented in Table 3. The particle size ranging from 5–25 mm exhibits continuous grading, while the values of crushing index, apparent density, bulk density, void ratio, mud content, mud block content, needle ...

Study on mechanical properties and damage characteristics …

Tailing and waste rock-cemented filling is an effective way to solve the problem solid waste in mines. In this paper, the effects of waste rock content and cement-sand ratio on the properties of tailing-waste rock-cemented filling materials and cemented backfill were analyzed based on the single-factor multi-level experimental design method. The results show …