Recycling of Oily Sludge as a Roadbed Material Utilizing Phosphogypsum-Based Cementitious Materials
Oily sludge is a hazardous waste containing emulsified petroleum hydrocarbons, water, heavy metals, and solid particles. The objective of this work is to employ solidification/stabilization (S/S) techniques to utilize oily sludge as a roadbed material with ordinary Portland cement (OPC), fly ash (FA...
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| Format: | Article |
| Language: | English |
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Wiley
2019-01-01
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| Series: | Advances in Civil Engineering |
| Online Access: | http://dx.doi.org/10.1155/2019/6280715 |
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| author | Wei Xiao Xiao Yao Fuyang Zhang |
| author_facet | Wei Xiao Xiao Yao Fuyang Zhang |
| author_sort | Wei Xiao |
| collection | DOAJ |
| description | Oily sludge is a hazardous waste containing emulsified petroleum hydrocarbons, water, heavy metals, and solid particles. The objective of this work is to employ solidification/stabilization (S/S) techniques to utilize oily sludge as a roadbed material with ordinary Portland cement (OPC), fly ash (FA), and silica fume (SF) as binders and phosphogypsum (PG) as a stabilizer. The efficacy of the S/S process is assessed mainly through an unconfined compressive strength (UCS) test and a toxicity leaching test. Road performance, including water stability, freeze-thaw resistance, and volume stability, is also tested on the solidified samples. The mineralogical compositions, microstructures, and pore structure are characterized through X-ray diffractometry (XRD), scanning electron microscopy (SEM), and mercury intrusion porosimetry (MIP). The results show that the addition of 20% binders (OPC : FA : SF = 1 : 0.7 : 0.8) in combination with phosphogypsum to the oily sludge not only increases the 28-day compressive strength of the solidified samples and remarkably decreases the release of heavy metals but also refines the pore structure and compacts the microstructure. The solidified body had sufficient strength and good water stability performance, freeze-thaw resistance, and volumetric stability. This solidification/stabilization (S/S) process, which combines oily sludge treatment and phosphogypsum resource utilization, significantly enhances environmental protection and renders the solidified product economically profitable. |
| format | Article |
| id | doaj-art-da8655c90ba44942b503cf3a18776e02 |
| institution | Kabale University |
| issn | 1687-8086 1687-8094 |
| language | English |
| publishDate | 2019-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Advances in Civil Engineering |
| spelling | doaj-art-da8655c90ba44942b503cf3a18776e022025-02-03T05:51:23ZengWileyAdvances in Civil Engineering1687-80861687-80942019-01-01201910.1155/2019/62807156280715Recycling of Oily Sludge as a Roadbed Material Utilizing Phosphogypsum-Based Cementitious MaterialsWei Xiao0Xiao Yao1Fuyang Zhang2College of Materials Science and Engineering, Nanjing Tech University, Nanjing 210009, ChinaCollege of Materials Science and Engineering, Nanjing Tech University, Nanjing 210009, ChinaCollege of Materials Science and Engineering, Nanjing Tech University, Nanjing 210009, ChinaOily sludge is a hazardous waste containing emulsified petroleum hydrocarbons, water, heavy metals, and solid particles. The objective of this work is to employ solidification/stabilization (S/S) techniques to utilize oily sludge as a roadbed material with ordinary Portland cement (OPC), fly ash (FA), and silica fume (SF) as binders and phosphogypsum (PG) as a stabilizer. The efficacy of the S/S process is assessed mainly through an unconfined compressive strength (UCS) test and a toxicity leaching test. Road performance, including water stability, freeze-thaw resistance, and volume stability, is also tested on the solidified samples. The mineralogical compositions, microstructures, and pore structure are characterized through X-ray diffractometry (XRD), scanning electron microscopy (SEM), and mercury intrusion porosimetry (MIP). The results show that the addition of 20% binders (OPC : FA : SF = 1 : 0.7 : 0.8) in combination with phosphogypsum to the oily sludge not only increases the 28-day compressive strength of the solidified samples and remarkably decreases the release of heavy metals but also refines the pore structure and compacts the microstructure. The solidified body had sufficient strength and good water stability performance, freeze-thaw resistance, and volumetric stability. This solidification/stabilization (S/S) process, which combines oily sludge treatment and phosphogypsum resource utilization, significantly enhances environmental protection and renders the solidified product economically profitable.http://dx.doi.org/10.1155/2019/6280715 |
| spellingShingle | Wei Xiao Xiao Yao Fuyang Zhang Recycling of Oily Sludge as a Roadbed Material Utilizing Phosphogypsum-Based Cementitious Materials Advances in Civil Engineering |
| title | Recycling of Oily Sludge as a Roadbed Material Utilizing Phosphogypsum-Based Cementitious Materials |
| title_full | Recycling of Oily Sludge as a Roadbed Material Utilizing Phosphogypsum-Based Cementitious Materials |
| title_fullStr | Recycling of Oily Sludge as a Roadbed Material Utilizing Phosphogypsum-Based Cementitious Materials |
| title_full_unstemmed | Recycling of Oily Sludge as a Roadbed Material Utilizing Phosphogypsum-Based Cementitious Materials |
| title_short | Recycling of Oily Sludge as a Roadbed Material Utilizing Phosphogypsum-Based Cementitious Materials |
| title_sort | recycling of oily sludge as a roadbed material utilizing phosphogypsum based cementitious materials |
| url | http://dx.doi.org/10.1155/2019/6280715 |
| work_keys_str_mv | AT weixiao recyclingofoilysludgeasaroadbedmaterialutilizingphosphogypsumbasedcementitiousmaterials AT xiaoyao recyclingofoilysludgeasaroadbedmaterialutilizingphosphogypsumbasedcementitiousmaterials AT fuyangzhang recyclingofoilysludgeasaroadbedmaterialutilizingphosphogypsumbasedcementitiousmaterials |