Recycling of biomass and coal fly ash as cement replacement material and its effect on hydration and carbonation of concrete

Teixeira, E.R.; Camões, Aires; Branco, Fernando G.; Aguiar, José; Fangueiro, Raúl

doi:10.1016/j.wasman.2019.05.044

Cited by 97 publications

(33 citation statements)

References 77 publications

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“…Therefore, using aeolian sand and fly ash as the filling materials can not only reduce the amount of waste disposal and disposal costs, but also save cement and reduce the filling cost [12]. Engineering practice has proven that adding fly ash to structural concrete can improve concrete performance, increase concrete strength in the later period, increase the compactness and resistance to concrete, reduce the shrinkage of concrete [13][14][15][16][17], and bring good economic and social benefits [18][19][20]. Therefore, aeolian sand and fly ash are some of the more cost-effective paste filling materials in the Yushenfu mining area, China.…”

Section: Introductionmentioning

confidence: 99%

Study on Rheological and Mechanical Properties of Aeolian Sand-Fly Ash-Based Filling Slurry

Shao

Wang

et al. 2020

Energies

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Backfill mining is the most environmentally friendly mining method at present, which can effectively control the surface subsidence, improve the recovery rate, and has good social and economic benefits. The purpose of this study is to solve the environmental problems caused by solid waste, combined with the rich geographical advantages of aeolian sand in the Yushenfu mining area of China. The rheological properties of the aeolian sand-fly ash-based filling slurry with different fly ash content are studied by experiments, and the strength development law of the filling body under different age and fly ash content are studied from the macroscopic and microscopic points of view. The rheological experiments showed that the increase of the amount of fly ash has a significant effect on the thixotropy, plastic viscosity, and yield stress of the filling slurry. Additionally, rheological properties of aeolian sand-fly ash-based filling slurry conform to the Bingham model. With the increase of the amount of fly ash, the performance of the filling slurry has been significantly improved. Uniaxial test and scanning electron microscope observation showed that the influence of fly ash on the strength of the filling body was mainly reflected in the late stage of maintenance, but was not obvious in the middle stage. Fly ash particles mainly bear the role of “water reduction” and a physical filling effect, which makes the filling slurry thicker and the internal structure more closely spaced. The volcanic ash reaction of fly ash is lagging behind the hydration reaction of cement; the secondary product of the delayed reaction is filled in the pores of cement hydrates, which can greatly reduce the porosity of the backfill body and increase the later strength of the backfill body. It provides a guarantee for the safe replacement of coal pillars in the working face.

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Section: Introductionmentioning

confidence: 99%

Study on Rheological and Mechanical Properties of Aeolian Sand-Fly Ash-Based Filling Slurry

Shao

Wang

et al. 2020

Energies

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“…At the same time, with the development of the power industry, the fly ash emission of coal-fired power plants annually increases and has become one of the most widespread industrial wastes with large emissions in China [29][30][31][32][33][34][35][36]. If a large amount of fly ash remains untreated, then dust and pollution become serious; if it is discharged into the water system, then it causes river silting, and the toxic chemicals it possesses harm the human body and organism [37][38][39].…”

Section: Introductionmentioning

confidence: 99%

Preparation and Performance of a Low-Carbon Foam Material of Fly-Ash-Based Foamed Geopolymer for the Goaf Filling

Wang

et al. 2020

Materials

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The treatment of goaf subsidence is important for sustainable development. Geopolymer is a new type of cementing material with excellent mechanical properties, durability, corrosion resistance, and other advantages owing to its unique three-dimensional spatial aggregation structure. Herein, a type of preparation technology of fly-ash-based foamed geopolymer suitable for goaf filling was developed by adding a chemical foaming agent to the matrix of fly-ash-based geopolymer. The mechanical properties, chemical composition, and pore structure characteristics of the samples were discussed. When the samples with different contents of fly ash, sodium metasilicate, sodium stearate, H2O2, and NaOH were prepared, a uniaxial compression test was performed to analyze the uniaxial compression failure characteristics and compression strength of the samples. The mineralogical composition of each sample was analyzed by X-ray diffraction (XRD) test, and the microstructure images of different samples were observed using scanning electron microscopy (SEM). The effects of the content of each component on the properties of the samples were discussed. Finally, the CO2 emission, energy consumption, and cost of producing fly-ash-based foamed geopolymer were analyzed. Overall, the material had the advantages of low energy consumption, low CO2 emission, environmental-protection ability, and waste utilization and thus has a broad application prospect in treating subsidence.

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“…Besides, some authors have pointed out the potential use of such wastes for manufacturing various materials 1,2 . In recent years, the incorporation of agricultural or plant wastes has been investigated particularly regarding the manufacturing of ceramic products 3–15 . Obviously, the use of plant wastes would promote pore development within ceramics during the firing or sintering process, due to their chemical degradation and related evolved gases.…”

Section: Introductionmentioning

confidence: 99%

Use of a kaolinitic‐illitic clay from Central African Republic and an organic waste for the production of porous ceramic materials

Deramne

Lecomte‐Nana

Peyratout

et al. 2020

Int J Ceramic Engine & Sci

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Recycling of biomass and coal fly ash as cement replacement material and its effect on hydration and carbonation of concrete

Cited by 97 publications

References 77 publications

Study on Rheological and Mechanical Properties of Aeolian Sand-Fly Ash-Based Filling Slurry

Study on Rheological and Mechanical Properties of Aeolian Sand-Fly Ash-Based Filling Slurry

Preparation and Performance of a Low-Carbon Foam Material of Fly-Ash-Based Foamed Geopolymer for the Goaf Filling

Use of a kaolinitic‐illitic clay from Central African Republic and an organic waste for the production of porous ceramic materials

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