Mechanical Properties of Tunnel Muck with Fly-Ash Geopolymer
The tunnel muck has a great potential to be used as a recyclable engineering material in transit and other civil work projects instead of being deposited as construction waste. In this work, the geopolymer is generated by alkali-activated fly ashes, which act as cementitious materials to strengthen...
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| Format: | Article |
| Language: | English |
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Wiley
2020-01-01
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| Series: | Advances in Civil Engineering |
| Online Access: | http://dx.doi.org/10.1155/2020/7247134 |
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| _version_ | 1832567470905360384 |
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| author | Dong Yang Zhiqin Xi Qiang Chen Shuisheng Li |
| author_facet | Dong Yang Zhiqin Xi Qiang Chen Shuisheng Li |
| author_sort | Dong Yang |
| collection | DOAJ |
| description | The tunnel muck has a great potential to be used as a recyclable engineering material in transit and other civil work projects instead of being deposited as construction waste. In this work, the geopolymer is generated by alkali-activated fly ashes, which act as cementitious materials to strengthen the tunnel muck. The tunnel muck has to be dehydrated, grinded, and screened before being treated by alkali-activated fly ash. The effect of the mass ratio between fly ash and tunnel muck (Mfa/Mtm), the mass ratio between Na2SiO3 solution and NaOH solution (MNa2SiO3/MNaOH), the ratio between liquid and solid (Mliquid/Msolid), and molarity of NaOH on the strength of geopolymer were systematically studied by conducting the uniaxial compression experiments. The experimental results indicate that the liquid-to-solid ratio is the most important parameter to the geopolymer strength after the alkali-activated fly ash treatment. On the contrary, molarity of NaOH is less effective on the geopolymer strength. Moreover, the optimum scheme is concluded according to the experimental results as follows: the mass ratio between tunnel muck and fly ash, the mass ratio between Na2SiO3 solution and NaOH solution, the ratio between liquid and solid, and molarity of NaOH are 1 : 2, 1.8, 0.18, and 10 mol/L, respectively. Meanwhile, the SEM images indicate that flocculence from the active substance in fly ash is a crucial component as the cementing material. |
| format | Article |
| id | doaj-art-b0a01002b62e464d839c321123eedcb7 |
| institution | Kabale University |
| issn | 1687-8086 1687-8094 |
| language | English |
| publishDate | 2020-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Advances in Civil Engineering |
| spelling | doaj-art-b0a01002b62e464d839c321123eedcb72025-02-03T01:01:31ZengWileyAdvances in Civil Engineering1687-80861687-80942020-01-01202010.1155/2020/72471347247134Mechanical Properties of Tunnel Muck with Fly-Ash GeopolymerDong Yang0Zhiqin Xi1Qiang Chen2Shuisheng Li3China Construction Fifth Engineering Division Co., Ltd., Changsha, Hunan 410004, ChinaChina Construction Fifth Engineering Division Co., Ltd., Changsha, Hunan 410004, ChinaEast China University of Technology, Nanchang, Jiangxi 330013, ChinaChina Construction Fifth Engineering Division Co., Ltd., Changsha, Hunan 410004, ChinaThe tunnel muck has a great potential to be used as a recyclable engineering material in transit and other civil work projects instead of being deposited as construction waste. In this work, the geopolymer is generated by alkali-activated fly ashes, which act as cementitious materials to strengthen the tunnel muck. The tunnel muck has to be dehydrated, grinded, and screened before being treated by alkali-activated fly ash. The effect of the mass ratio between fly ash and tunnel muck (Mfa/Mtm), the mass ratio between Na2SiO3 solution and NaOH solution (MNa2SiO3/MNaOH), the ratio between liquid and solid (Mliquid/Msolid), and molarity of NaOH on the strength of geopolymer were systematically studied by conducting the uniaxial compression experiments. The experimental results indicate that the liquid-to-solid ratio is the most important parameter to the geopolymer strength after the alkali-activated fly ash treatment. On the contrary, molarity of NaOH is less effective on the geopolymer strength. Moreover, the optimum scheme is concluded according to the experimental results as follows: the mass ratio between tunnel muck and fly ash, the mass ratio between Na2SiO3 solution and NaOH solution, the ratio between liquid and solid, and molarity of NaOH are 1 : 2, 1.8, 0.18, and 10 mol/L, respectively. Meanwhile, the SEM images indicate that flocculence from the active substance in fly ash is a crucial component as the cementing material.http://dx.doi.org/10.1155/2020/7247134 |
| spellingShingle | Dong Yang Zhiqin Xi Qiang Chen Shuisheng Li Mechanical Properties of Tunnel Muck with Fly-Ash Geopolymer Advances in Civil Engineering |
| title | Mechanical Properties of Tunnel Muck with Fly-Ash Geopolymer |
| title_full | Mechanical Properties of Tunnel Muck with Fly-Ash Geopolymer |
| title_fullStr | Mechanical Properties of Tunnel Muck with Fly-Ash Geopolymer |
| title_full_unstemmed | Mechanical Properties of Tunnel Muck with Fly-Ash Geopolymer |
| title_short | Mechanical Properties of Tunnel Muck with Fly-Ash Geopolymer |
| title_sort | mechanical properties of tunnel muck with fly ash geopolymer |
| url | http://dx.doi.org/10.1155/2020/7247134 |
| work_keys_str_mv | AT dongyang mechanicalpropertiesoftunnelmuckwithflyashgeopolymer AT zhiqinxi mechanicalpropertiesoftunnelmuckwithflyashgeopolymer AT qiangchen mechanicalpropertiesoftunnelmuckwithflyashgeopolymer AT shuishengli mechanicalpropertiesoftunnelmuckwithflyashgeopolymer |