Soil Stabilization Using Waste Paper Fly Ash: Precautions for Its Correct Use
This paper deals with the valorization of waste paper fly ash (WPFA) as a binder for soil stabilization. The mineralogical characterization shows the presence of free lime, as well as some non-reactive and cementitious phases. The hydration of lime is an expansive reaction and can be problematic in...
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| Format: | Article |
| Language: | English |
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MDPI AG
2020-12-01
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| Series: | Applied Sciences |
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| Online Access: | https://www.mdpi.com/2076-3417/10/23/8750 |
| _version_ | 1797545423389327360 |
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| author | Hani Baloochi Diego Aponte Marilda Barra |
| author_facet | Hani Baloochi Diego Aponte Marilda Barra |
| author_sort | Hani Baloochi |
| collection | DOAJ |
| description | This paper deals with the valorization of waste paper fly ash (WPFA) as a binder for soil stabilization. The mineralogical characterization shows the presence of free lime, as well as some non-reactive and cementitious phases. The hydration of lime is an expansive reaction and can be problematic in soil stabilization. Therefore, to study its effect on stabilized soil, an in-house experimental set-up is proposed to measure the possible expansion. Furthermore, to study the effect of water reduction and delay time on strength, unconfined compressive strength with different mixes is conducted. The obtained results showed that using WPFA causes expansion in stabilized soil, but a delay time of 30 min, after mixing the material with water and then compacting it, can decrease the expansion. Additionally, decreasing the water content by a point of Proctor can be essential for improving the strength in soil samples, even reaching the same strength values as control samples cured at 7 days. Finally, all the results obtained in this study have shown that WPFA is a suitable material for use as a binder for soil stabilization while reducing its optimum water content, adding a proper delay time, and taking into consideration WPFA’s expansive behavior at the moment of its use. |
| first_indexed | 2024-03-10T14:16:11Z |
| format | Article |
| id | doaj.art-08c3a624a6bc48d886bbf23a05229fe1 |
| institution | Directory Open Access Journal |
| issn | 2076-3417 |
| language | English |
| last_indexed | 2024-03-10T14:16:11Z |
| publishDate | 2020-12-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Applied Sciences |
| spelling | doaj.art-08c3a624a6bc48d886bbf23a05229fe12023-11-20T23:46:37ZengMDPI AGApplied Sciences2076-34172020-12-011023875010.3390/app10238750Soil Stabilization Using Waste Paper Fly Ash: Precautions for Its Correct UseHani Baloochi0Diego Aponte1Marilda Barra2Department of Civil and Environmental Engineering, Universitat Politècnica de Catalunya (UPC-BarcelonaTech), Jordi Girona 1-3, 08034 Barcelona, SpainDepartment of Civil and Environmental Engineering, Universitat Politècnica de Catalunya (UPC-BarcelonaTech), Jordi Girona 1-3, 08034 Barcelona, SpainDepartment of Civil and Environmental Engineering, Universitat Politècnica de Catalunya (UPC-BarcelonaTech), Jordi Girona 1-3, 08034 Barcelona, SpainThis paper deals with the valorization of waste paper fly ash (WPFA) as a binder for soil stabilization. The mineralogical characterization shows the presence of free lime, as well as some non-reactive and cementitious phases. The hydration of lime is an expansive reaction and can be problematic in soil stabilization. Therefore, to study its effect on stabilized soil, an in-house experimental set-up is proposed to measure the possible expansion. Furthermore, to study the effect of water reduction and delay time on strength, unconfined compressive strength with different mixes is conducted. The obtained results showed that using WPFA causes expansion in stabilized soil, but a delay time of 30 min, after mixing the material with water and then compacting it, can decrease the expansion. Additionally, decreasing the water content by a point of Proctor can be essential for improving the strength in soil samples, even reaching the same strength values as control samples cured at 7 days. Finally, all the results obtained in this study have shown that WPFA is a suitable material for use as a binder for soil stabilization while reducing its optimum water content, adding a proper delay time, and taking into consideration WPFA’s expansive behavior at the moment of its use.https://www.mdpi.com/2076-3417/10/23/8750waste paper fly ashsoil stabilizationslaking of WPFAcompressive strength developmentinitial and final expansion of stabilized soil |
| spellingShingle | Hani Baloochi Diego Aponte Marilda Barra Soil Stabilization Using Waste Paper Fly Ash: Precautions for Its Correct Use Applied Sciences waste paper fly ash soil stabilization slaking of WPFA compressive strength development initial and final expansion of stabilized soil |
| title | Soil Stabilization Using Waste Paper Fly Ash: Precautions for Its Correct Use |
| title_full | Soil Stabilization Using Waste Paper Fly Ash: Precautions for Its Correct Use |
| title_fullStr | Soil Stabilization Using Waste Paper Fly Ash: Precautions for Its Correct Use |
| title_full_unstemmed | Soil Stabilization Using Waste Paper Fly Ash: Precautions for Its Correct Use |
| title_short | Soil Stabilization Using Waste Paper Fly Ash: Precautions for Its Correct Use |
| title_sort | soil stabilization using waste paper fly ash precautions for its correct use |
| topic | waste paper fly ash soil stabilization slaking of WPFA compressive strength development initial and final expansion of stabilized soil |
| url | https://www.mdpi.com/2076-3417/10/23/8750 |
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