Durability and microstructure of CSA cement-based materials from MSWI fly ash

Municipal solid waste incineration (MSWI) fly ash was successfully used as a main raw material in sintering and preparing alinite cement clinker in laboratory. Based on this, this work focused on the effects of cement admixtures on the compressive strength and durability of the alinite cement-based materials. The optimum mix mass ratio was confirmed, i.e. the mass ratio of alinite cement clinker / gypsum / cement additives (MSWI fly ash, fly ash, or slag) was 80 % / 5 % / 15 %. The experimental results showed that addition of cement additives could improve resistance to sulfate attack of the prepared alinite cement-based materials. The resistance to carbonation and water permeability could be improved by adding different cement additives. The effectiveness is specimen AD3 (with 15 wt. % slag) > AB3 (with 15 wt. % MSWI fly ash) > AC3 (with 15 wt. % fly ash). However, addition of cement additives had negative effects on the dry shrinkage. Finally, with the hydration ages increasing, the content of soluble chloride ion from alinite cement specimen AB3 was decreased. It would be stable in long term. This work improves utilization of industrial solid wastes as cement additives in the prepared alinite cement from MSWI fly ash. It is beneficial for our understanding and application of alinite composite cement as construction and building materials.

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Durability of Calcium Sulphoaluminate (CSA) Composite Cement-Based Materials Made from Municipal Solid Waste Incineration (MSWI) Fly Ash

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.719-720.214 ◽

2015 ◽

Vol 719-720 ◽

pp. 214-217

Author(s):

Xiao Lu Guo ◽

Hui Sheng Shi ◽

Wen Pei Hu ◽

Kai Wu

Keyword(s):

Fly Ash ◽

Municipal Solid Waste ◽

Solid Waste ◽

Waste Incineration ◽

Raw Material ◽

Hardened Cement ◽

Municipal Solid Waste Incineration ◽

Mswi Fly Ash ◽

Cement Based Materials ◽

Calcium Sulphoaluminate

Municipal solid waste incineration (MSWI) fly ash was successfully used as a main raw material in sintering and preparing calcium sulphoaluminate (CSA) cement in laboratory. This work focused on effects of cement additives of MSWI fly ash, lime powder (LI), fly ash (FA), and slag powder (SL) on the durability of CSA cement-based materials. Compared with the hardened cement containing 10% MSWI fly ash alone, compressive strengths of samples containing 20% combined additives was improved significantly. When 20% combined additives were added the resistance to shrinkage, carbonation and sulfate attack was strengthened while the combined additives had negative effects on the resistance to water permeability.

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Influence of fly ash on the properties of cement-based materials

SCC'2005-China - 1st International Symposium on Design, Performance and Use of Self-Consolidating Concrete ◽

10.1617/2912143624.060 ◽

2005 ◽

Author(s):

B. Liu

Keyword(s):

Fly Ash ◽

Cement Based Materials

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A mini-review of heavy metal recycling technologies for municipal solid waste incineration fly ash

Waste Management & Research ◽

10.1177/0734242x211003968 ◽

2021 ◽

pp. 0734242X2110039

Author(s):

Huan Wang ◽

Fenfen Zhu ◽

Xiaoyan Liu ◽

Meiling Han ◽

Rongyan Zhang

Keyword(s):

Fly Ash ◽

Municipal Solid Waste ◽

Solid Waste ◽

Waste Incineration ◽

Electrochemical Process ◽

Chemical Extraction ◽

Air Pollution Control ◽

Municipal Solid Waste Incineration ◽

Mswi Fly Ash ◽

Metal Recycling

This mini-review article summarizes the available technologies for the recycling of heavy metals (HMs) in municipal solid waste incineration (MSWI) fly ash (FA). Recovery technologies included thermal separation (TS), chemical extraction (CE), bioleaching, and electrochemical processes. The reaction conditions of various methods, the efficiency of recovering HMs from MSWI FA and the difficulties and solutions in the process of technical development were studied. Evaluation of each process has also been done to determine the best HM recycling method and future challenges. Results showed that while bioleaching had minimal environmental impact, the process was time-consuming. TS and CE were the most mature technologies, but the former process was not cost-effective. Overall, it has the greatest economic potential to recover metals by CE with scrubber liquid produced by a wet air pollution control system. An electrochemical process or solvent extraction could then be applied to recover HMs from the enriched leachate. Ongoing development of TS and bioleaching technologies could reduce the treatment cost or time.

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Effect of silica fume on the mechanical property and hydration characteristic of alkali-activated municipal solid waste incinerator (MSWI) fly ash

Journal of Cleaner Production ◽

10.1016/j.jclepro.2021.126317 ◽

2021 ◽

Vol 295 ◽

pp. 126317

Author(s):

Jun Ren ◽

Lu Hu ◽

Zhijun Dong ◽

Luping Tang ◽

Feng Xing ◽

...

Keyword(s):

Mechanical Property ◽

Fly Ash ◽

Municipal Solid Waste ◽

Silica Fume ◽

Waste Incinerator ◽

Municipal Solid Waste Incinerator ◽

Mswi Fly Ash ◽

Solid Waste Incinerator ◽

Alkali Activated ◽

Hydration Characteristic

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An Experimental Study on the Melting Solidification of Municipal Solid Waste Incineration Fly Ash

Sustainability ◽

10.3390/su13020535 ◽

2021 ◽

Vol 13 (2) ◽

pp. 535

Author(s):

Jing Gao ◽

Tao Wang ◽

Jie Zhao ◽

Xiaoying Hu ◽

Changqing Dong

Keyword(s):

Heavy Metals ◽

High Temperature ◽

Fly Ash ◽

Municipal Solid Waste ◽

Solid Waste ◽

Liquid Slag ◽

Melting Process ◽

Waste Incineration ◽

Municipal Solid Waste Incineration ◽

Mswi Fly Ash

Melting solidification experiments of municipal solid waste incineration (MSWI) fly ash were carried out in a high-temperature tube furnace device. An ash fusion temperature (AFT) test, atomic absorption spectroscopy (AAS), scanning electron microscope (SEM), and X-ray diffraction (XRD) were applied in order to gain insight into the ash fusibility, the transformation during the melting process, and the leaching behavior of heavy metals in slag. The results showed that oxide minerals transformed into gehlenite as temperature increased. When the temperature increased to 1300 °C, 89 °C higher than the flow temperature (FT), all of the crystals transformed into molten slag. When the heating temperatures were higher than the FT, the volatilization of the Pb, Cd, Zn, and Cu decreased, which may have been influenced by the formation of liquid slag. In addition, the formation of liquid slag at a high temperature also improved the stability of heavy metals in heated slag.

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