Improvement effect of pyrolyzed agro-food biochar on the properties of magnesium phosphate cement
Autor: | Haijuan Duan, Muhammad Riaz Ahmad, Bing Chen |
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Rok vydání: | 2020 |
Předmět: |
Cement
Magnesium phosphate Environmental Engineering Absorption of water Materials science 010504 meteorology & atmospheric sciences Sorptivity Construction Materials Magnesium Compounds 010501 environmental sciences 01 natural sciences Pollution Phosphates Chemical engineering Charcoal Biochar Water environment Environmental Chemistry Mortar Waste Management and Disposal Pyrolysis 0105 earth and related environmental sciences |
Zdroj: | The Science of the total environment. 718 |
ISSN: | 1879-1026 |
Popis: | This study extends the application of pyrolyzed biochar and investigates its influence on the mechanical, sorption and microstructure properties of magnesium phosphate cement mortar. Biochar was produced by the pyrolysis of wheat straw biomass by controlled burning and its replacement level was kept up to 1.5%. At the age of 30 days, the compressive and flexural strength of mortar containing 1.5% biochar was 17.3% and 9.0% higher as compared to the control mortar, which was associated with the micro-filler and internal reservoir effect of biochar particles. Inclusion of biochar considerably improved the resistance of magnesium phosphate cement in the water environment. Sorptivity and water absorption of mortar containing 1.5% biochar was reduced by 33.8% and 25% respectively than the control mortar. Biochar densified the microstructure of mortars by filling the microcracks and blocking the pores. X-ray diffraction and Fourier transform infrared spectroscopy did not provide any information about the formation of new hydration products. Elemental analysis of mortar samples using energy dispersive spectroscopy showed the presence of some elements, which indicates the possibility of new hydration products. Based on the positive results in this study, future study will include the detailed chemical effect of biochar on magnesium phosphate cement. |
Databáze: | OpenAIRE |
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