Effect of Concentration and Suspension Agent (HPMC) on Properties of Coal Gangue and Fly Ash Cemented Filling Material

Yang, Bo; Jin, Junyu; Yin, Xindong; Wang, Xiaoyu; Yang, Haijiao

doi:10.1155/2021/6643773

Cited by 10 publications

(8 citation statements)

References 31 publications

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“…In this paper, Box-Behnken design (BBD) based on the response surface methodology (RSM) was conducted by using Design-Expert 10.0.3 software [21]. In the Box-Behnken design, wet fly ash/ construction waste ratio, Talbol gradation index of construction waste, and usage of water reducing agent were taken as independent variables.…”

Section: Experimental Design Methodmentioning

confidence: 99%

“…Liu et al [20] analyzed the aggregate particle size distribution, compressive strength, and fine structure of cementitious paste fillings prepared from construction waste and ordinary silicate cement. Yang et al [21] established the regression models by using the RSM optimization method to explore the effects of the concentration and suspension agent on the properties of coal gangue and silicate cement based cementitious filling material and finally obtained an optimal mix ratio. Tang et al [22] used the RSM-DDC (the central-composite design based on the response surface methodology) method to study the mechanical properties of the filling material ratio with coal gangue as aggregate and Portland cement as cementitious materials, assessed the influence of each component on the properties, and got the optimal ratio with the coal-based solid waste consumption of 91.5%.…”

Section: Introductionmentioning

confidence: 99%

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Experimental Research on Mix Ratio of Construction Waste Cemented Filling Material Based on Response Surface Methodology

Chen

Zhang

Qin

et al. 2022

Advances in Materials Science and Engineering

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In order to solve the problem of insufficient supply of aggregate for cemented filling material, the experimental research on the mix ratio of cemented filling material using construction waste as recycled coarse aggregate was carried out. A ternary quadratic regression model was created using the Box-Behnken design (BBD) based on the response surface methodology (RSM), using slump, bleeding ratio, and 28 d uniaxial compressive strength of the filling material as response variables, and the model’s accuracy and reliability were confirmed. The findings of the regression model reveal that the response value is influenced by a single component as well as the interaction between the two factors. Finally, based on filling material cost optimization model, an optimal mix ratio is given, in which the wet fly ash/aggregate ratio, Talbol gradation index of recycled aggregate, and dosage of water reducing agent to cement are 0.507, 0.5, and 0.678%, respectively. The filling material which adopted the optimal mix ratio exhibited a good performance with slump of 215 mm and bleeding ratio of 4.00%, uniaxial compressive strength increased significantly within 3 d, and 28 d uniaxial compressive strength was 4.08 MPa, which meet the requirements of field construction.

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Section: Experimental Design Methodmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Experimental Research on Mix Ratio of Construction Waste Cemented Filling Material Based on Response Surface Methodology

Chen

Zhang

Qin

et al. 2022

Advances in Materials Science and Engineering

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“…In terms of utilization of solid waste: Zhang et al [10,11] used the uniform test method to carry out the proportioning test of coal gangue, fly ash, and other mine solid wastes and examined the optimal proportioning and hydration reaction mechanism of paste filling materials. Yang et al [12] studied the influence of slurry concentration and suspending agent on the performance of coal gangue-fly ash cemented filling material through the response surface method and established the prediction model of slump, segregation rate, and bleeding rate of coal gangue-fly ash slurry. Dai et al [13] tested the optimum mix ratio of unclassified tailings on the basis of Box-Behnken, and the best mix ratio of cement slurry filling was obtained.…”

Section: Introductionmentioning

confidence: 99%

Fluidity Influencing Factor Analysis and Ratio Optimization of New Filling Slurry Based on the Response Surface Method

Chang¹,

Hua²,

Liu³

et al. 2022

Journal of Renewable Materials

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The filling mining method is important in realizing the green mining of mineral resources. Aiming at the problems of land resource occupation, environmental pollution, and rational utilization of coal-based solid wastes such as coal gangue, fly ash, and desulfurization gypsum, a new paste filling material was developed with coal gangue, fly ash, and desulfurization gypsum as raw materials. The microstructure of the raw materials was analyzed by XRD and SEM. Combined with the Box-Behnken experimental design, the effect of each component on the fluidity of the filling slurry was analyzed through the response surface analysis. The significance of each component on its bleeding and fluidity was determined, and the optimal ratio of the filling slurry was obtained. Experimental results show that the microcosmic morphology of coal gangue, desulfurization gypsum, and gasification slag presents an irregular block and rough particle surface; the microcosmic morphology of fly ash and bottom slag presents first out spherical or quasi spherical particles. Moreover, obvious sintering traces exist on the surface of the bottom slag. The main crystal mineral of coal gangue and fly ash is SiO 2 , the desulfurization gypsum is composed of Ca(SO 4 ) (H 2 O) and Ca(CO 3 ) crystal minerals, the gasification slag is composed of carbon and nitrogen compounds, and the main crystal mineral components in the bottom slag sample are SiO 2 and Al x Si y O z compounds. The order of significance of each key factor on slurry fluidity is as follows: C (desulfurization gypsum) > D (gasification slag and bottom slag 1:1) > A (coal gangue) > B (fly ash). The order of the significance of each key factor on slurry bleeding is as follows: B (fly ash) > C (desulfurization gypsum) > D (gasification slag and bottom slag 1:1) > A (coal gangue). Considering the material preparation, field application, and other conditions, the mass percentage of each factor content of the new paste filling material is as follows: 49.5% coal gangue, 8.3% fly ash, 4.1% desulfurization gypsum, 6.2% gasification slag, and 6.2% bottom slag.

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“…For the preliminary studies on the application of blast furnace slag and gas quenching furnace slag in mine filling, some studies have evaluated their application and grasped that the use of blast furnace slag and gas quenching furnace slag as cementing materials can play a good role in mine filling, providing a basis for reducing the filling cost [25]. The binder made by fly ash, lime, and desulfurization gypsum is much better to the traditional cementing materials; its filling body can meet the general requirement of mining production [26][27][28][29][30]. Under the action of a variety of activators, the water-quench secondary nickel slag eventually generates silicate hydrate gel material that plays a major role in the later strength of the filling body [31,32].…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Lead-Smelting Slag as Paste Filling Cementing Material

2022

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Under the current pressure of mineral product price and market competition, as well as the tightening of ecological and environmental protection policies, energy saving, emission reduction and cost reduction, and efficiency increase have become inevitable trends. Lead-smelting slag of smelter, as an industrial byproduct, is harmful solid waste to be eliminated. In this research, a series of experiments on substitute for cement were done for filling cost reduction under premise of guaranteeing the filling strength, using PC32.5 cement as reference cementing material. Meanwhile, with Portland cement clinker, water quenching slag of BF ironmaking, and lead-smelting slag of smelter in different ratios, four cementing materials were made and named as cementing material I, cementing material II, cementing material III, and cementing material IV. Then, the above five cementing materials including PC32.5 cement were mixed, respectively, with tailing and water to prepare paste backfill slurry with different binder-tailing ratio and concentration. Backfill block was made and cured at 20°C; their uniaxial compressive strengths in different curing ages were measured. The result shows the strength of backfill test block using cementing material I (cement clinker and water quenching slag) without lead-smelting slag is far higher than that of test block using PC32.5 cement as cementing material. The strength of block with 16% lead-smelting slag increased dramatically, which was higher than the strength of block using PC32.5 as cementing material. However, the strength of test block decreased when the content of lead-smelting slag reached 32% and 40%. The more lead-smelting slag was added, the worse influence on strength of backfill would be. Because of large specific gravity of lead-smelting slag and low content of CaO, the hydration activity of lead-smelting slag is far lower than that of water quenching slag. Therefore, using moderate lead-smelting slag as substitute for cement will lead to increase of backfill strength and decrease filling cost.

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Effect of Concentration and Suspension Agent (HPMC) on Properties of Coal Gangue and Fly Ash Cemented Filling Material

Cited by 10 publications

References 31 publications

Experimental Research on Mix Ratio of Construction Waste Cemented Filling Material Based on Response Surface Methodology

Experimental Research on Mix Ratio of Construction Waste Cemented Filling Material Based on Response Surface Methodology

Fluidity Influencing Factor Analysis and Ratio Optimization of New Filling Slurry Based on the Response Surface Method

Experimental Study on Lead-Smelting Slag as Paste Filling Cementing Material

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