Fluidity Influencing Factors Analysis and Ratio Optimization of New Sealing Materials Based on Response Surface Method

Guo, Xin; Xue, Sheng; Li, Yaobin; Zheng, Chen; Yang, Guangsong

doi:10.1155/2021/5538302

Cited by 2 publications

(2 citation statements)

References 23 publications

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“…The results of SEM and XRD show that the particles of gasification slag and bottom slag are large, and many pores appear on the surfaces of gasification slag and bottom slag. After full mixing, a large number of fly ashes with smaller particle size enter the pores formed by the accumulation of larger particles, which increases the bulk density of aggregate and limits the outward diffusion of smaller fly ash particles; conversely, Ca(OH) 2 and AFT cements generated by the interaction between cement and water are attached to the surface of particles, resulting in bonding between particles, which increases the consistency of slurry and reduces the fluidity of filling slurry [31]. Fig.…”

Section: Liquidity Analysismentioning

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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Section: Liquidity Analysismentioning

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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“…It can be known from the above analysis that the factors affecting the permeability coefficient after clogging of PC are the porosity of the test specimen, the height of the head, and the horizontal runoff velocity of the surface. To analyze the weight of the three factors in this experiment, the above three factors are analyzed based on Design-Expert 8.0.6 software, and the experiment was conducted by using Box-Behnken in the Design-Expert 8.0.6 software [56].…”

Section: Porosity Analysis Of Clogging Of Pcmentioning

confidence: 99%

Comprehensive Test and Evaluation Analysis of Permeable Concrete (PC) Clogging by Using Steel Slag

Cao

Shah

Wang

et al. 2022

Advances in Civil Engineering

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In recent decade, researchers have more attention to water resource protection and forward the concept of sponge city construction. PC is becoming more and more popular as a rainwater management tool because of fast climate changes worldwide. In this experiment, PC specimens were prepared with steel slag as aggregate, and the targeted porosity of specimens was 15%, 20%, and 25% respectively, and the ratio of water to cement was 0.38, 0.4, and 0.42. The PC specimens under the 200 mm high head are the most severely blocked; 0.283 m/s high-speed horizontal runoff appears after the rapid plugging stage later in the other two types of speed tests. With time, the plugging effect of the test specimen is almost the same; the clogging degree of the PC sample with the porosity of 25% is more obvious than that of other porosity test specimens. The PC with large porosity is more serious to clogging because the higher seepage velocity will enter the internal tunnel with higher penetration force, which increases the possibility of clogging. Tests have shown that, at different rainwater runoff head heights, the PC specimens under the 200 mm high head are the most severely blocked; 0.283 m/s high-speed horizontal runoff appears after the rapid plugging stage later in the other two types of speed tests but over time. With time, the plugging effect of the test specimen was almost the same; the clogging degree of the permeable concrete sample with the porosity of 25% is more obvious than that of other porosity test specimens. While it is noticed that the compressive strength of the PC after clogging has decreased in the freeze-thaw environment, the destruction process is faster than the unblocked test specimen.

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Fluidity Influencing Factors Analysis and Ratio Optimization of New Sealing Materials Based on Response Surface Method

Cited by 2 publications

References 23 publications

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

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

Comprehensive Test and Evaluation Analysis of Permeable Concrete (PC) Clogging by Using Steel Slag

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