scholarly journals Microstructure and Strength of Alkali-Activated Bricks Containing Municipal Solid Waste Incineration (MSWI) Fly Ash Developed as Construction Materials

2019 ◽  
Vol 11 (5) ◽  
pp. 1283 ◽  
Author(s):  
Peng Xu ◽  
Qingliang Zhao ◽  
Wei Qiu ◽  
Yan Xue ◽  
Na Li
Keyword(s):  
Compressive Strength ◽  
Fly Ash ◽  
Municipal Solid Waste ◽  
Solid Waste ◽  
Building Materials ◽  
Waste Incineration ◽  
Engineering Properties ◽  
Chloride Salt ◽  
Municipal Solid Waste Incineration ◽  
Alkali Activated

Alkali-activated materials (AAM) are widely applied in the field of building materials and civil engineering to substitute cement materials. This study used two types of municipal solid waste incineration fly ash (MSWI-FA): grate-firing fly ash (GFFA) and fluidized bed fly ash (FBFA) as brick raw materials. Various weight ratio of 20%, 30%, and 40% GFFA and FBFA were added to coal fly ash (CFA), GGBFs (Ground Granulated Blast-Furnace Slag), and an alkali-activating reagent to produce alkali-activated bricks. Microstructure and crystalline phase composition were observed to analyze their compressive strength, and a leaching test was used to prove the material’s safety for the environment. It can be seen from the results of this study that the alkali-activated bricks containing FBFA had higher compressive strength than those containing GFFA in the same amount. Considering the engineering properties, the alkali-activated bricks containing FBFA are more suitable to be used as building materials. The difference in the compressive strength resulted from the large amount of calcium compounds and chloride salts present in the GFFA. From SEM analysis, it was observed that there was a large number of pores in the microstructure. It was also found from the results of XRD that the bricks containing GFFA contained a large amount of chloride salt. From the results of the two leaching tests, it was found that the amounts of six heavy metals detected in the leachates of the bricks in this study met the corresponding regulation standards. This described MSWI-FA is suitable for use as alkali-activated material, and its products have potential to be commercially used in the future.

scholarly journals Solidification of Municipal Solid Waste Incineration Fly Ash through Co-Mechanical Treatment with Circulation Fluidized Bed Combustion Fly Ash

Materials ◽  
2019 ◽  
Vol 13 (1) ◽  
pp. 141
Author(s):  
Zhengzhen Yao ◽  
Zhonghui Xu ◽  
Qin Shuai ◽  
Xiaoyue Chen ◽  
Zao Jiang ◽  
...  
Keyword(s):  
Compressive Strength ◽  
Fly Ash ◽  
Municipal Solid Waste ◽  
Solid Waste ◽  
Fluidized Bed ◽  
Mechanical Treatment ◽  
Waste Incineration ◽  
Municipal Solid Waste Incineration ◽  
Fluidized Bed Combustion ◽  
Waste Incineration Fly Ash

This study aims to explore the solidification performance of municipal solid waste incineration fly ash (MSWIFA) through co-mechanical treatment with circulation fluidized bed combustion fly ash (CFBCFA). The mineral characterization, physical properties, and leaching resistance of the solidified bodies are investigated by X-ray diffraction spectroscopy (XRD), Fourier transform infrared spectroscopy (FT-IR), Thermogravimetry-differential thermal analysis (TG-DTA), compressive strength, porosity, and leaching test, respectively. C–S–H, ettringite (AFt), and Friedel’s salt (FS) are the predominant hydrate products in the CFBCFA based solidified bodies, which are similar to the cement based solidified bodies. However, CFBCFA based solidified bodies exhibit higher compressive strength (36.7 MPa) than cement based solidified bodies (11.28 MPa), attributing to the three reasons: lower porosity and more compact internal structure of CFBCFA based solidified bodies; large amounts of Ca(OH)2 originating from MSWIFA are conducive to promoting the hydration reaction extent and compressive strength of the CFBCFA based solidified bodies; excessive Ca(OH)2 would cause compressive strength deterioration for the cement based solidified bodies. The heavy metals (Zn, Cu, Cr, Cd, and Pb) concentrations in the extraction solution of the CFBCFA based solidified bodies are far below the requirements of Chinese National Standard GB 5085.3-2007. The solidification of MSWIFA through co-mechanical treatment could be an ideal substitute for cement solidification technology.

Experimental study on the washing characteristics of fly ash from municipal solid waste incineration

2021 ◽  
pp. 0734242X2110682
Author(s):  
Mi Yan ◽  
Jiahao Jiang ◽  
Rendong Zheng ◽  
Caimeng Yu ◽  
Zhihao Zhou ◽  
...  
Keyword(s):  
Fly Ash ◽  
Municipal Solid Waste ◽  
Solid Waste ◽  
Salt Content ◽  
Waste Incineration ◽  
Soluble Salt ◽  
Chloride Salt ◽  
Municipal Solid Waste Incineration ◽  
Gas Cleaning ◽  
High Salt Content

The disposal of fly ash with high salt content has become an important bottleneck for the further application of municipal solid waste incineration (MSWI). In this study, the soluble salt content and composition of fly ash from different MSWI were analysed. The composition of fly ash was affected by incinerator type and flue gas cleaning system, especially the type of deacidification solvent. The soluble salt content in fly ash from MSW grate incinerator can be over 35.16%. Most of the soluble salt was calcium salt and chloride salt. The effect of washing parameters including liquid/solid (L/S) ratio and washing time on salt removal from fly ash were studied. Raw fly ash contained high chlorine (Cl) with the maximum of 19.83% and it can be significantly reduced by washing. Double-washing and secondary-washing had better performance than single-washing on salt removal. The secondary-washing did not only save water, but also reduced the energy cost during evaporation for crystallising soluble salt. Based on the analysis of variance (ANOVA), L/S ratio was the most principal factor for salt and Cl removal of fly ash by washing.

Analysis of Macro-Performance of FA Ceramic Brick

2013 ◽  
Vol 849 ◽  
pp. 279-282
Author(s):  
Hai Ying Zhang
Keyword(s):  
Compressive Strength ◽  
Fly Ash ◽  
Municipal Solid Waste ◽  
Water Absorption ◽  
Solid Waste ◽  
Waste Incineration ◽  
Municipal Solid Waste Incineration ◽  
Ceramic Brick ◽  
Mswi Fly Ash ◽  
Waste Incineration Fly Ash

In this work, MSWI (municipal solid waste incineration) fly ash is used as a blending in production of ceramic brick by taking advantage of its high contents of SiO2, Al2O3 and CaO. Besides, macro-performance of the product was studied. It is found that when 20% fly ash is added, the product registers a high compressive strength of 18.9 MPa and a low water absorption of 8.9 % after being sintered at 1000°C. These results as a whole suggest that the use of MSWI fly ash in ceramic brick constitutes a potential means of adding value.

scholarly journals Properties of Alkali Activated Lightweight Aggregate Generated from Sidoarjo Volcanic Mud (Lusi), Fly Ash, and Municipal Solid Waste Incineration Bottom Ash

Materials ◽  
2020 ◽  
Vol 13 (11) ◽  
pp. 2528
Author(s):  
Puput Risdanareni ◽  
Yury Villagran ◽  
Katrin Schollbach ◽  
Jianyun Wang ◽  
Nele De Belie
Keyword(s):  
Compressive Strength ◽  
Fly Ash ◽  
Municipal Solid Waste ◽  
Solid Waste ◽  
Bottom Ash ◽  
Lightweight Aggregate ◽  
Waste Incineration ◽  
Raw Material ◽  
Fine Aggregate ◽  
Municipal Solid Waste Incineration

Production of artificial lightweight aggregate (LWA) from industrial by-products or abundant volcanic mud is a promising solution to prevent damaging the environment due to the mining of natural aggregate. However, improvements are still needed in order to control the high water absorption of LWA and strength reduction in resulting concrete or mortar. Hence in this research, fly ash, municipal solid waste incineration bottom ash (MSWI BA), and Sidoarjo volcanic mud (Lusi) were employed as a precursor and activated using NaOH 6 M and Na2SiO3 in producing LWA. The influence of the type of the precursors on the physical properties of resulting LWA was investigated. The effect of replacing natural fine aggregate with the resulting LWA on the compressive strength and volume density of mortar was also determined. Finer particles, a high amount of amorphous phase, and low loss on ignition (LOI) of the raw material improved the properties of resulting LWA. Mortar compressive strength was decreased by 6% when replacing 16% by volume of natural fine aggregate with fly ash based LWA. Compared to the expanded clay LWA, the properties of alternative LWAs in this study were slightly, but not significantly, inferior. Alternative LWA becomes attractive when considering that expanded clay LWA requires more energy during the sintering process.

Stabilization of cesium in alkali-activated municipal solid waste incineration fly ash and a pyrophyllite-based system

Chemosphere ◽  
2017 ◽  
Vol 187 ◽  
pp. 188-195 ◽  
Author(s):  
Kenji Shiota ◽  
Takafumi Nakamura ◽  
Masaki Takaoka ◽  
Siti Fatimah Aminuddin ◽  
Kazuyuki Oshita ◽  
...  
Keyword(s):  
Fly Ash ◽  
Municipal Solid Waste ◽  
Solid Waste ◽  
Waste Incineration ◽  
Municipal Solid Waste Incineration ◽  
Alkali Activated ◽  
Waste Incineration Fly Ash

Stabilization of lead in an alkali-activated municipal solid waste incineration fly ash–Pyrophyllite-based system

2017 ◽  
Vol 201 ◽  
pp. 327-334 ◽  
Author(s):  
Kenji Shiota ◽  
Takafumi Nakamura ◽  
Masaki Takaoka ◽  
Siti Fatimah Aminuddin ◽  
Kazuyuki Oshita ◽  
...  
Keyword(s):  
Fly Ash ◽  
Municipal Solid Waste ◽  
Solid Waste ◽  
Waste Incineration ◽  
Municipal Solid Waste Incineration ◽  
Alkali Activated ◽  
Waste Incineration Fly Ash
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