Study on Performance Tests and the Application of Construction Waste as Subgrade Backfill
The application of construction waste as an aggregate in subgrade backfilling is an important recycling option. This study analyzed a subgrade backfill material consisting of lime-fly ash construction waste mixture (LFCWM). Compaction and California bearing ratio (CBR) tests were performed on LFCWM...
| Main Authors: | , , , , , , , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2021-05-01
|
| Series: | Materials |
| Subjects: | |
| Online Access: | https://www.mdpi.com/1996-1944/14/9/2381 |
| _version_ | 1797535344171679744 |
|---|---|
| author | Qingbiao Wang Jie Zhang Kang Liu Andong Xu Haolin Xu Mingcong Yang Cun Wang Rongshuai Yang Guangtao Bao Yunfei Liu Zhongjing Hu Zhenyue Shi |
| author_facet | Qingbiao Wang Jie Zhang Kang Liu Andong Xu Haolin Xu Mingcong Yang Cun Wang Rongshuai Yang Guangtao Bao Yunfei Liu Zhongjing Hu Zhenyue Shi |
| author_sort | Qingbiao Wang |
| collection | DOAJ |
| description | The application of construction waste as an aggregate in subgrade backfilling is an important recycling option. This study analyzed a subgrade backfill material consisting of lime-fly ash construction waste mixture (LFCWM). Compaction and California bearing ratio (CBR) tests were performed on LFCWM under different cement-aggregate ratios (CARs, 3:7, 4:6, 5:5, 8:2). Different normal stresses (100, 200, and 300 kPa) and aggregate sizes (20%, 40%, 60%, 80% of P<sub>4.75</sub>) were also evaluated. The experimental results indicated that: (1) when the CAR was 4:6, the optimum water content and the maximum dry density reached their maximum values of 10.1% and 2.03 g/cm<sup>3</sup>, respectively, the maximum CBR value was 42.5%, and the shear strength reached its maximum value. (2) With an increase in shear displacement, the shear stress showed a rapid initial increase, then a slow decrease, and finally tended to stabilize. (3) Normal stress had a positive effect on the shear strength of the mixture. (4) When P<sub>4.75</sub> was 40%, the shear strength of LFCWM was the maximum. The research results have been successfully applied to road engineering, providing an important reference for the application of construction waste aggregate in roadbed engineering. |
| first_indexed | 2024-03-10T11:43:07Z |
| format | Article |
| id | doaj.art-29aa41343c34425c90304cb4e90be240 |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-10T11:43:07Z |
| publishDate | 2021-05-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Materials |
| spelling | doaj.art-29aa41343c34425c90304cb4e90be2402023-11-21T18:16:26ZengMDPI AGMaterials1996-19442021-05-01149238110.3390/ma14092381Study on Performance Tests and the Application of Construction Waste as Subgrade BackfillQingbiao Wang0Jie Zhang1Kang Liu2Andong Xu3Haolin Xu4Mingcong Yang5Cun Wang6Rongshuai Yang7Guangtao Bao8Yunfei Liu9Zhongjing Hu10Zhenyue Shi11State Key Laboratory of Mining Disaster Prevention and Control Co-Founded by Shandong Province and the Ministry of Science and Technology, Shandong University of Science and Technology, Qingdao 266590, ChinaCollege of Civil Engineering and Architecture, Shandong University of Science and Technology, Qingdao 266590, ChinaCollege of Resources, Shandong University of Science and Technology, Tai’an 271019, ChinaCollege of Resources, Shandong University of Science and Technology, Tai’an 271019, ChinaCollege of Resources, Shandong University of Science and Technology, Tai’an 271019, ChinaCollege of Resources, Shandong University of Science and Technology, Tai’an 271019, ChinaCollege of Resources, Shandong University of Science and Technology, Tai’an 271019, ChinaCollege of Resources, Shandong University of Science and Technology, Tai’an 271019, ChinaCollege of Resources, Shandong University of Science and Technology, Tai’an 271019, ChinaCollege of Resources, Shandong University of Science and Technology, Tai’an 271019, ChinaCollege of Safety and Environmental Engineering (College of Safety and Emergency Managemen), Shandong University of Science and Technology, Qingdao 266590, ChinaCollege of Safety and Environmental Engineering (College of Safety and Emergency Managemen), Shandong University of Science and Technology, Qingdao 266590, ChinaThe application of construction waste as an aggregate in subgrade backfilling is an important recycling option. This study analyzed a subgrade backfill material consisting of lime-fly ash construction waste mixture (LFCWM). Compaction and California bearing ratio (CBR) tests were performed on LFCWM under different cement-aggregate ratios (CARs, 3:7, 4:6, 5:5, 8:2). Different normal stresses (100, 200, and 300 kPa) and aggregate sizes (20%, 40%, 60%, 80% of P<sub>4.75</sub>) were also evaluated. The experimental results indicated that: (1) when the CAR was 4:6, the optimum water content and the maximum dry density reached their maximum values of 10.1% and 2.03 g/cm<sup>3</sup>, respectively, the maximum CBR value was 42.5%, and the shear strength reached its maximum value. (2) With an increase in shear displacement, the shear stress showed a rapid initial increase, then a slow decrease, and finally tended to stabilize. (3) Normal stress had a positive effect on the shear strength of the mixture. (4) When P<sub>4.75</sub> was 40%, the shear strength of LFCWM was the maximum. The research results have been successfully applied to road engineering, providing an important reference for the application of construction waste aggregate in roadbed engineering.https://www.mdpi.com/1996-1944/14/9/2381LFCWMcompaction testCBR valueshear strength |
| spellingShingle | Qingbiao Wang Jie Zhang Kang Liu Andong Xu Haolin Xu Mingcong Yang Cun Wang Rongshuai Yang Guangtao Bao Yunfei Liu Zhongjing Hu Zhenyue Shi Study on Performance Tests and the Application of Construction Waste as Subgrade Backfill Materials LFCWM compaction test CBR value shear strength |
| title | Study on Performance Tests and the Application of Construction Waste as Subgrade Backfill |
| title_full | Study on Performance Tests and the Application of Construction Waste as Subgrade Backfill |
| title_fullStr | Study on Performance Tests and the Application of Construction Waste as Subgrade Backfill |
| title_full_unstemmed | Study on Performance Tests and the Application of Construction Waste as Subgrade Backfill |
| title_short | Study on Performance Tests and the Application of Construction Waste as Subgrade Backfill |
| title_sort | study on performance tests and the application of construction waste as subgrade backfill |
| topic | LFCWM compaction test CBR value shear strength |
| url | https://www.mdpi.com/1996-1944/14/9/2381 |
| work_keys_str_mv | AT qingbiaowang studyonperformancetestsandtheapplicationofconstructionwasteassubgradebackfill AT jiezhang studyonperformancetestsandtheapplicationofconstructionwasteassubgradebackfill AT kangliu studyonperformancetestsandtheapplicationofconstructionwasteassubgradebackfill AT andongxu studyonperformancetestsandtheapplicationofconstructionwasteassubgradebackfill AT haolinxu studyonperformancetestsandtheapplicationofconstructionwasteassubgradebackfill AT mingcongyang studyonperformancetestsandtheapplicationofconstructionwasteassubgradebackfill AT cunwang studyonperformancetestsandtheapplicationofconstructionwasteassubgradebackfill AT rongshuaiyang studyonperformancetestsandtheapplicationofconstructionwasteassubgradebackfill AT guangtaobao studyonperformancetestsandtheapplicationofconstructionwasteassubgradebackfill AT yunfeiliu studyonperformancetestsandtheapplicationofconstructionwasteassubgradebackfill AT zhongjinghu studyonperformancetestsandtheapplicationofconstructionwasteassubgradebackfill AT zhenyueshi studyonperformancetestsandtheapplicationofconstructionwasteassubgradebackfill |