Preparation and characterization of mullite whisker reinforced ceramics made from coal fly ash

Li, Chaoxin; Zhou, Yi; Tian, Yuming; Zhao, Yuanyuan; Wang, Kaiyue; Li, Guomin; Chai, Yisheng

doi:10.1016/j.ceramint.2018.12.021

Cited by 41 publications

(12 citation statements)

References 17 publications

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“…In the ceramics processing field, industrial wastes such as fly ash were effectively utilized as the raw material for ceramics [17][18][19][20]. Fly ash has very fine particles with an average diameter of approximately 10 µm, and it is chemically made of SiO 2 and Al 2 O 3 .…”

Section: Introductionmentioning

confidence: 99%

Ceramics based on concrete wastes prepared by spark plasma sintering

Abass

Kanda

2021

PAC

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An effective utilization technique is required to recycle fine aggregate in concrete waste because the presence of residual waste cement reduces the quality of the recycled concrete. In this study, recycled aggregate powder (RAP) was prepared by milling Okinawan concrete waste and developing a ceramic compact with high flexural strength using the spark plasma sintering (SPS) method. The RAP raw material consisted mainly of calcite and quartz. The densification gradient of the sintered compact was uniform during sintering at 1123-1273K. At 1273K sintering temperature, Vickers hardness (HV) obtained a maximum of 393 along with 78.9MPa maximum flexural strength, which exceeded the porcelain stoneware tile ISO 13006 standards. Scanning electron microscopy with energy dispersive X-ray (SEM-EDX) element analysis suggested that the inner structure constituted unmelted silica-rich sand particles and melted calcium-rich particles containing waste cement and fine aggregate with limestone. Therefore, it can be concluded that SPS progressed by the liquid-phase sintering phenomenon between sand particles and calcium-rich particles, which contributed to flexural strength and modulus improvement.

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Section: Introductionmentioning

confidence: 99%

Ceramics based on concrete wastes prepared by spark plasma sintering

Abass

Kanda

2021

PAC

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“…Meanwhile, large diffraction peaks of were found for mullite, which came from artificial heating of aluminum silicate during the process of high temperature calcination [25]. Although the XRD map (Figure 15d) of 10% coke residue and 40% fly ash concrete also found the diffraction peaks of CaSO 4 and Tobey mullite, many diffraction peaks of mullite were found, which may be the main reason why the strength of fly ash-coke residue concrete was much lower than that of ordinary concrete [26].…”

Section: Resultsmentioning

confidence: 99%

Effect of Solid Waste-Petroleum Coke Residue on the Hydration Reaction and Property of Concrete

Wang

Quan

2019

Materials

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Taking advantage of the desulfurization petroleum coke residue obtained from circulating fluidized bed boiler technology to replace a part of cement clinker and prepare the concrete can not only reduce the production of cement clinker and related CO2 emissions, but can also improve the utilization rate and utilization level of petroleum coke waste, which has good environmental and economic benefits. In this study, through the comprehensive analysis of a compressive strength test, X-ray diffraction test, and Cl− penetration resistance test, the hydration mechanism of desulfurized petroleum coke residue in concrete is revealed, and the optimum replacement ratios of single-added petroleum coke residue, multi-added petroleum coke residue, and mineral admixtures in concrete are evaluated and proposed. The results showed that mixing the 10% petroleum coke residue and 40% blast furnace slag would be most appropriate to replace the cement in concrete, thus the effective utilization of mineral admixtures and coke residue in concrete without strength loss could be realized.

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“…At the same time, ash and slag waste is a valuable secondary raw material for various industries; therefore, the development of methods for their disposal is an urgent task. Numerous studies indicate there is a demand for ash and slag waste in the construction industry for the production of bricks and ceramics [ 13 , 14 , 15 , 16 ], thermal insulation materials [ 17 , 18 , 19 , 20 ], independent binders or active additive to organic and inorganic binders [ 18 , 21 , 22 ], concrete [ 23 , 24 , 25 , 26 ], composite materials [ 27 , 28 , 29 ], etc.…”

Section: Introductionmentioning

confidence: 99%

Structural Formation of Soil Concretes Based on Loam and Fly Ash, Modified with a Stabilizing Polymer Additive

et al. 2022

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Finding new ways of recycling production waste to improve the characteristics of various building materials is an urgent scientific task. This article substantiates the possibility of the disposal of fly ash in the composition of soil concrete, which is used in the construction of the structural layers of road pavements, foundations of buildings and structures, as well as sites for various purposes. The scientific novelty lies in the fact that the structure formation of soil concretes based on loam and fly ash and modified with a stabilizing additive is being studied for the first time. It was found that the investigated fly ash, according to its hydraulic properties, is classified as latent active and can be introduced into the compositions of road soil concrete modified with additives of various resources. The effectiveness of the complex method of stabilization, due to changes in soil properties as a result of the use of the binding and stabilizing additives of polymer nature “Kriogelit”, is shown. It was found that the optimal content of binder and fly ash in the samples was 8 and 10 wt.%, respectively. It was established that the use of the stabilizing additive “Kriogelit” makes it possible to obtain soil concrete with the highest strength (compressive strength 2.5 MPa, flexural strength 0.5 MPa) and frost resistance of at least F15. The microstructure, the degree of dehydration and carbonization, and the phase composition of the initial raw mixtures and soil concretes stabilized with the addition of “Kriogelit” were studied by methods of scanning electron microscopy, X-ray diffraction analysis, differential scanning calorimetry, thermogravimetry, and infrared spectroscopy. It was shown that organo-mineral complexes, with the participation of polymer and montmorillonite, are formed in stabilized soil concrete. It was revealed that structure formation is accompanied by the physical adsorption of the polymer on active centers of silicate minerals, carbonization, and hydration–dehydration processes. It was found that the reason for the increase in the strength of stabilized soil concretes is the hydrophobization of the porous structure of minerals, as well as the formation of calcium oxide silicate and dicalcium hydrated silicate. By the method of performing biotests with the test objects Daphnia magna Straus and Chlorella vulgaris Beijer, it was proven that the developed road concretes modified with the stabilizing additive “Kriogelit” do not have an acute toxic effect on the test objects and are safe for the environment and human health.

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Preparation and characterization of mullite whisker reinforced ceramics made from coal fly ash

Cited by 41 publications

References 17 publications

Ceramics based on concrete wastes prepared by spark plasma sintering

Ceramics based on concrete wastes prepared by spark plasma sintering

Effect of Solid Waste-Petroleum Coke Residue on the Hydration Reaction and Property of Concrete

Structural Formation of Soil Concretes Based on Loam and Fly Ash, Modified with a Stabilizing Polymer Additive

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