Effects of Corn Stalk Fly Ash (CSFA) on the Mechanical and Deformation Properties of Cemented Coal Gangue Backfill

Qi, Tingye; Wang, Haochen; Feng, Guorui; Du, Xianjie; Wang, Zehua; Zhang, Shufeng

doi:10.1155/2020/7421769

Cited by 12 publications

(7 citation statements)

References 42 publications

(42 reference statements)

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“…The materials used in the test include coal gangue, fly ash, corn straw fly ash, cement and water, and their physical and chemical properties can be referred to [17,18,34]. According to the previous research results and other researchers' work, coal gangue is mainly composed of silicon dioxide (SiO2) and aluminum oxide (Al2O3) [35][36][37].…”

Section: Methodsmentioning

confidence: 99%

“…Wang et al, [17] showed that replacing the same amount of fly ash with the same amount of corn straw fly ash can effectively improve the compressive strength of backfill. Qi et al, [18] investigated the substitution of corn straw fly ash for part of cement in the slurry and concluded that the compressive strength and drying shrinkage ratio of the filling body were the best when the replacement rate was 20%.…”

Section: Introductionmentioning

confidence: 99%

“…Most researchers mainly focus on substitution ratio, compressive strength, shear strength and other aspects when studying CPB slurry substitute materials [17,18,30]. Nevertheless, the rheological characteristics and pipeline transport characteristics have not been well studied.…”

Section: Introductionmentioning

confidence: 99%

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Pipeline Transportation Characteristics of Different Cementing Materials in CPB Slurry

Dong

Aziz

Shafri

et al. 2022

ARFMTS

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Research on the underground filling mining of Cemented Paste Backfilling (CPB) slurry shows that it alleviates the underground subsidence and environmental problems caused by mining, making a strong contribution to the realization of green mining. To optimize performance, cost reductions, and the recycling of agricultural solid waste, some researchers have studied using volcanic fly ash (FA) to replace part of cement. Corn straw fly ash (CSFA) may be used to replace the same amount of part of cement or FA, as corn straw can improve the mechanical properties of FA to make the CPB slurry for filling goaf. On this basis, in order to ensure a good flow of the CPB slurry in the pipeline, we need to conduct pipeline tests on the slurry of these different cement materials to verify their feasibility. In this article, Fluent has been used to study the CPB slurry transport properties in the two cases mentioned above through numerical simulation. Comparing the velocity distribution and pressure loss changes of the CPB slurry with different proportions in the horizontal pipeline provides a reference for future CPB slurry research. The results show that: (1) FA forms a lubricating layer in the pipe wall due to its "ball effect", which effectively reduces the yield stress and pressure loss of the CPB slurry in the pipe, and plays a positive role in the transportation of CPB in the pipe; and (2) CSFA increases the CPB slurry transport pressure loss due to its irregular particle size, increasing the risk of pipe wear. The results are helpful for better understanding and designing paste filling material for mine.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Pipeline Transportation Characteristics of Different Cementing Materials in CPB Slurry

Dong

Aziz

Shafri

et al. 2022

ARFMTS

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“…Moreover, because incineration ash usually exhibits pozzolanic activity, other types of incineration ash have also been applied as SCMs for CLSM production. These include incineration sludge ash, such as waste paper sludge ash (WPSA) [16], incineration sludge ash [17], and mixed incineration sludge ash [18]; garbage incineration ash, such as domestic waste incinerator bottom ash [19] and industrial waste incineration bottom ash [20]; and biomass incineration ash, such as wood ash [21], corn straw ash [22,23], rice straw ash [24] and bagasse ash [25]. Among the metallurgical industrial by-products, blast-furnace slag is often used as an SCM for CLSM production, due to its high hydration activity.…”

Section: Clsm Strengthmentioning

confidence: 99%

Research Progress on Controlled Low-Strength Materials: Metallurgical Waste Slag as Cementitious Materials

Liu

et al. 2022

Materials

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Increasing global cement and steel consumption means that a significant amount of greenhouse gases and metallurgical wastes are discharged every year. Using metallurgical waste as supplementary cementitious materials (SCMs) shows promise as a strategy for reducing greenhouse gas emissions by reducing cement production. This strategy also contributes to the utilization and management of waste resources. Controlled low-strength materials (CLSMs) are a type of backfill material consisting of industrial by-products that do not meet specification requirements. The preparation of CLSMs using metallurgical waste slag as the auxiliary cementing material instead of cement itself is a key feature of the sustainable development of the construction industry. Therefore, this paper reviews the recent research progress on the use of metallurgical waste residues (including blast furnace slag, steel slag, red mud, and copper slag) as SCMs to partially replace cement, as well as the use of alkali-activated metallurgical waste residues as cementitious materials to completely replace cement for the production of CLSMs. The general background information, mechanical features, and properties of pozzolanic metallurgical slag are introduced, and the relationship and mechanism of metallurgical slag on the performance and mechanical properties of CLSMs are analyzed. The analysis and observations in this article offer a new resource for SCM development, describe a basis for using metallurgical waste slag as a cementitious material for CLSM preparation, and offer a strategy for reducing the environmental problems associated with the treatment of metallurgical waste.

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“…Maize straw ash is the burnt residue of the leaves, stalks, and cobs of maize plants left on the field after harvest [14]. MSA possesses substantial pozzolanic properties and a large amount of silica [15]. However, only a few studies have been conducted on its use in concrete.…”

Section: Introductionmentioning

confidence: 99%

Effect of Combining Maize Straw and Palm Oil Fuel Ashes in Concrete as Partial Cement Replacement in Compression

et al. 2021

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The high energy consumption connected with cement manufacturing, as well as the depletion of limestone resources and the release of carbon dioxide, which contributes to global warming, are all important issues that must be addressed. Partially replacing cement with agricultural wastes in concrete, which reduces cement output, is an innovative solution to this problem. This paper examined the effect of combining Palm Oil Fuel Ash (POFA) and Maize Straw Ash (MSA) as partial replacement of cement on the compressive strength of Grade 20 concrete at 0 - 30 % POFA and 0 - 30 % MSA using Historical data under the Response Surface study in Design-Expert software. The concrete cubes were tested at 7, 28, and 56 days of curing. It was discovered that there was a decrease in the compressive strength of the concrete with the percentage increase in the quantity of the POFA and MSA for all the curing days considered. However, there was a progressive increase in the compressive strength with an increase in the days of curing. The optimum combination of percentages of POFA, MSA and cement that gave a strength greater than the target compressive strength of 20 N/mm2 in 56 days is 30 % POFA and 16.6 % MSA and 53.4 % Cement at 0.58 water-cement ratio. HIGHLIGHTS Combining Palm Oil Fuel Ash and Maize Straw Ash as partial replacement of cement Using Historical data under the Response Surface study in Design-Expert software A decrease in the compressive strength of concrete with increase in the quantity of the POFA and MSA Optimum combination for strength greater than 20 N/mm2 in 56 days obtained GRAPHICAL ABSTRACT

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Effects of Corn Stalk Fly Ash (CSFA) on the Mechanical and Deformation Properties of Cemented Coal Gangue Backfill

Cited by 12 publications

References 42 publications

Pipeline Transportation Characteristics of Different Cementing Materials in CPB Slurry

Pipeline Transportation Characteristics of Different Cementing Materials in CPB Slurry

Research Progress on Controlled Low-Strength Materials: Metallurgical Waste Slag as Cementitious Materials

Effect of Combining Maize Straw and Palm Oil Fuel Ashes in Concrete as Partial Cement Replacement in Compression

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