Utilization of tailings in concrete products: A review

Adigüzel, Deniz; Tüylü, Serkan; Eker, Hasan

doi:10.1016/j.conbuildmat.2022.129574

Cited by 47 publications

(8 citation statements)

References 80 publications

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“…The specific settings of each factor are shown in Table 7. The optimal material ratio of cementitious material that meets the strength requirement is TA-LZT content/FA content/cement content = 28.99:14.58:56.43, the sand/binder ratio is 1:1, the water/binder ratio is 0.47, and the compressive strength is predicted to be 20 MPa according to Equation (6). The cost of raw materials used in one ton is CNY 290.965/ton, and the price/performance ratio is CNY 14.548/MPa.…”

Section: Optimization Of Raw Materials Ratiomentioning

confidence: 99%

Optimization of Cementitious Material with Thermal-Activated Lead–Zinc Tailings Based on Response Surface Methodology

Lin,

Yin,

2024

Materials

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The accumulation of lead–zinc tailings will cause a series of problems, including geological disasters and environmental pollution. Efficient secondary utilization of lead–zinc tailings is crucial. In this study, the activity of lead–zinc tailings was stimulated by thermal activation. The optimal thermal activation parameters are a thermal activation temperature of 900 °C and a holding time of 30 min. Based on the response surface methodology, the effect of raw materials content on cementitious material strength was analyzed, and the relational model between cementitious material strength and experimental variables was established. The results show that the sensitivity order of cementitious material strength at 28 days curing age is sand/cement ratio > water/cement ratio > fly ash content > tailing content. According to the relational model, the optimal materials ratio is as follows: tailing/fly ash/cement = 28.99%:14.58%:56.43%, and the sand/binder ratio and water/binder ratio are 1:1 and 0.47, respectively. The corresponding cost is CNY 290.965 per ton, which is the lowest. The strength of cementitious material with these parameters can reach 20 MPa, which meets the requirements of “Technical specification for application of solid waste cementitious material (T/CECS 689-2020)”.

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Section: Optimization Of Raw Materials Ratiomentioning

confidence: 99%

Optimization of Cementitious Material with Thermal-Activated Lead–Zinc Tailings Based on Response Surface Methodology

Lin,

Yin,

2024

Materials

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“…(2) This experiment only explores the relatively optimal ratio; the more detailed optimal ratio in this range can be further explored. (3) In this experiment, the mechanical and thermal parameters of the material were only tested for 28 days, and the field test also had certain limitations. Further accurate experimental parameter tests were needed to determine its applicability.…”

Section: Prospectsmentioning

confidence: 99%

“…At the same time, mining activities have produced a large amount of solid waste. At this stage, there are still problems with environmental pollution and low resource recovery due to the improper treatment of solid waste [3]. Therefore, a large number of scholars have tried to add solid waste such as tailings or coal fly ash into concrete to reduce the cost of concrete, improve the utilization rate of solid waste, and reduce environmental pollution.…”

Section: Introductionmentioning

confidence: 99%

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Research on New Solid Waste Heat Insulation Material for Deep Mining

Wen

Zheng

2023

Minerals

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The global demand for mineral resources has led to the gradual transformation of the mining industry from the traditional shallow, small-scale mining mode to the high-intensity mining of deep underground mines. Due to the high stress, high temperature, high permeability, and easy disturbance of deep mines, new challenges have been brought to the mining of materials. Some scholars have improved the thermal insulation performance of concrete by adding low thermal conductivity materials such as ceramsite, shell, and natural fiber to traditional shotcrete, but there are still high costs, insufficient support strength, and unsatisfactory thermal insulation effects. Given the background related to the fact that it is still not possible to fully recycle the large amount of solid waste generated by mining activities, this paper, with traditional shotcrete as its basis, uses coal fly ash to replace part of the cement and tailings to replace part of the sand and gravel aggregate. In addition, it adds basalt fiber to reduce thermal conductivity and restore strength. An orthogonal experiment of three factors and three levels was designed to explore a new type of solid waste-based thermal insulation support shotcrete material. Through the testing and analysis of the mechanical and thermal properties of the specimens, it was concluded that the optimal ratio of the materials was 45% fly ash, 50% tailings, and 25% basalt fiber (the percentage of the total mass of fly ash and cement). The compressive strength of the specimens after curing for 28 days could reach 16.26 MPa, and the thermal conductivity and apparent density were 0.228561 W/(m·k) and 1544.00 kg/m3, respectively. By using COMSOL Multiphysics multi-physics coupling software to analyze the coupling of the stress field and temperature field, it was concluded that the optimum thickness of the thermal insulation layer of this material was 150 mm. The field application in a mine in Shandong Province proved that it met the effects of thermal insulation (the ability to isolate heat conduction) and support. The successful trial of this material provides a new idea for the solving of the problem of heat damage and solid waste utilization in deep mines, which has a certain practical significance.

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“…The technical parameters positively affected by the use of recyclates are abrasion resistance [56], ultra-high strength [57], high-temperature resistance [58], high chemical resistance [59], heat storage capacity [60], and resistance to sewage effluent environments [61]. Such articles [62][63][64] have demonstrated that, with the right composition of components, even recycled ones [65,66], the use of recyclates in composites can lead to positive economic and environmental effects. These environmental advantages include eliminating the need for detailed waste treatment or thermal treatment, which releases detergent washing and heat deposits into the environment.…”

Section: Introductionmentioning

confidence: 99%

Recycling Waste Agricultural Nets as Cement Composites

Zegardło,

Maraveas,

Świeczka

et al. 2024

Materials

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The advancement of agricultural mesh technology has contributed to its improved properties. As a result, agricultural nets are widely adopted in large-scale farming applications, for example, in cereal crop farming. However, a consequence of this increased use of agricultural nets is the accumulation of large amounts of waste. The current paper focuses on the recycling of agricultural nets used in wrapping straw bales to develop additives and fillers in cement composites. The research details an analysis of the use of waste agricultural meshes as an ingredient in cement composites. Six test series of different mixtures were conducted. In the first four series, agricultural waste was utilised as an additive in a composite comprising aggregate and cement slurry (the amounts of wasted nets were 20, 40, 60, and 80 kg/m3). In the last test series, the recyclate utilised comprised a mixture of cement slurry and waste only. The composites were subjected to standard tests and thermal resistance tests. The results showcased that that the addition of a net worsened the workability of the concrete mixture, and with increasing amounts of addition, the consistency of the mixture could change from liquid to dense plastic. The flexural strength of the composite decreased with increasing amounts of recyclate. In subsequent test series, the flexural strength value was lower than that of the control (3.93 MPa), from 7.38% (3.64 MPa) for the composite with 20 kg/m3 of recyclate to 37.66% (2.45 MPa) for the composite with of 80 kg/m3 recyclate. The flexural strength value of the net-filled composite without aggregate was very high (10.44 MPa), where the value obtained for the control composite was 62.36% lower. The results of the compressive strength test showed a decrease in this parameter with increasing amounts of additive. The value assessed for the control composite was 27.99 MPa. As expected, the composite that had no aggregate and consisted of only recycled filler had the lowest compressive strength. The value of this parameter was 13.07 MPa, and it was 53.31% lower than that of the control composite. The results of the tests of resistance to temperatures were similar to those recorded for the composites with polypropylene fibres. All composites demonstrated a significant decrease in their compressive and flexural strength after annealing. SEM imaging showed that the net fibres were closely bonded to the cement stone. Finally, it was concluded that recyclates performed best as fillers in lightweight composites with a low density, low absorption, high flexural strength, and satisfactory compressive strength.

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Utilization of tailings in concrete products: A review

Cited by 47 publications

References 80 publications

Optimization of Cementitious Material with Thermal-Activated Lead–Zinc Tailings Based on Response Surface Methodology

Optimization of Cementitious Material with Thermal-Activated Lead–Zinc Tailings Based on Response Surface Methodology

Research on New Solid Waste Heat Insulation Material for Deep Mining

Recycling Waste Agricultural Nets as Cement Composites

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